Recommendations_with_IBM.ipynb

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    "# Recommendations with IBM\n",
    "\n",
    "In this notebook, you will be putting your recommendation skills to use on real data from the IBM Watson Studio platform. \n",
    "\n",
    "\n",
    "You may either submit your notebook through the workspace here, or you may work from your local machine and submit through the next page.  Either way assure that your code passes the project [RUBRIC](https://review.udacity.com/#!/rubrics/3325/view).  **Please save regularly.**\n",
    "\n",
    "By following the table of contents, you will build out a number of different methods for making recommendations that can be used for different situations. \n",
    "\n",
    "\n",
    "## Table of Contents\n",
    "\n",
    "I. [Exploratory Data Analysis](#Exploratory-Data-Analysis)<br>\n",
    "II. [Rank Based Recommendations](#Rank)<br>\n",
    "III. [User-User Based Collaborative Filtering](#User-User)<br>\n",
    "IV. [Content Based Recommendations (EXTRA - NOT REQUIRED)](#Content-Recs)<br>\n",
    "V. [Matrix Factorization](#Matrix-Fact)<br>\n",
    "VI. [Extras & Concluding](#conclusions)\n",
    "\n",
    "At the end of the notebook, you will find directions for how to submit your work.  Let's get started by importing the necessary libraries and reading in the data."
   ]
  },
  {
   "cell_type": "code",
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   "source": [
    "import pandas as pd\n",
    "import numpy as np\n",
    "import matplotlib.pyplot as plt\n",
    "import project_tests as t\n",
    "import pickle\n",
    "\n",
    "%matplotlib inline\n",
    "\n",
    "df = pd.read_csv('data/user-item-interactions.csv')\n",
    "df_content = pd.read_csv('data/articles_community.csv')\n",
    "del df['Unnamed: 0']\n",
    "del df_content['Unnamed: 0']\n",
    "\n",
    "# Show df to get an idea of the data\n",
    "df.head(10)"
   ]
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   "cell_type": "code",
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   "source": [
    "# Show df_content to get an idea of the data\n",
    "df_content.head()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### <a class=\"anchor\" id=\"Exploratory-Data-Analysis\">Part I : Exploratory Data Analysis</a>\n",
    "\n",
    "Use the dictionary and cells below to provide some insight into the descriptive statistics of the data.\n",
    "\n",
    "`1.` What is the distribution of how many articles a user interacts with in the dataset?  Provide a visual and descriptive statistics to assist with giving a look at the number of times each user interacts with an article.  "
   ]
  },
  {
   "cell_type": "code",
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       "35283       268.0                      sector correlations shiny app   NaN\n",
       "35284       162.0  an introduction to stock market data analysis ...   NaN\n",
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   "source": [
    "# Check df for NaN values\n",
    "df[df.isna().any(axis=1)]"
   ]
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  {
   "cell_type": "code",
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       "    <tr>\n",
       "      <th>00c2d5190e8c6b821b0e3848bf56f6e47e428994</th>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>00ced21f957bbcee5edf7b107b2bd05628b04774</th>\n",
       "      <td>4</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>00d9337ecd5f70fba1c4c7a78e21b3532e0112c4</th>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>00e524e4f13137a6fac54f9c71d7769c6507ecde</th>\n",
       "      <td>11</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>00f8341cbecd6af00ba8c78b3bb6ec49adf83248</th>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>00f946b14100f0605fa25089437ee9486378872c</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>01041260c97ab9221d923b0a2c525437f148d589</th>\n",
       "      <td>2</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>0108ce3220657a9a89a85bdec959b0f2976dd51c</th>\n",
       "      <td>4</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>011455e91a24c1fb815a4deac6b6eaf5ad16819e</th>\n",
       "      <td>9</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>01198c58d684d79c9026abe355cfb532cb524dc5</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>011ae4de07ffb332b0f51c155a35c23c80294962</th>\n",
       "      <td>35</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>011fcfb582be9534e9a275336f7e7c3717100381</th>\n",
       "      <td>11</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>0129dfcdb701b6e1d309934be6393004c6683a2d</th>\n",
       "      <td>15</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>01327bbc4fd7bfe8ad62e599453d2876b928e725</th>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>01455f0ab0a5a22a93d94ad35f6e78431aa90625</th>\n",
       "      <td>7</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>014dedab269f1453c647598c92a3fa37b39eed97</th>\n",
       "      <td>2</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>014e4fe6e6c5eb3fe5ca0b16c16fb4599df6375c</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>01560f88312a91894d254e6406c25df19f0ad5e8</th>\n",
       "      <td>11</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>...</th>\n",
       "      <td>...</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fe5396e3762c36767c9c915f7ed1731691d7e4b4</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fe5480ff15f0ac51eeb2314a192351f168d7aad7</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fe56a49b62752708ed2f6e30677c57881f7b78d1</th>\n",
       "      <td>15</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fe5885b80e91be887510a0b6dd04e011178d6364</th>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fe5f9d7528518e00b0a73c7a3994afc335496961</th>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fe66aa534c7824eca663b84b99a437a98a9b026e</th>\n",
       "      <td>2</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fe69c72c964a8346dbc7763309c4e07d818d360f</th>\n",
       "      <td>4</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fe88d1f683f308b32fb3d7554f007cc55cc48df5</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fe8c1cb974e39d8ea8c005044e927b3f0de8acd0</th>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fe90d98b0287090fe8e653bafba6ed3eff19331e</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fe9327be39fd457df70e83d3fc8cba9b8b3f95b1</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>feaea388105a4ccc48795b191bbf0c26a23b1356</th>\n",
       "      <td>4</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fef0c6be3a2ed226e1fb8a811b0ee68a389f6f3c</th>\n",
       "      <td>13</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fef28e45f7217026b2684d1783a2e18b061bdffb</th>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fef3bc88def1aa787c99957ded7d5b2c0edc040e</th>\n",
       "      <td>4</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ff27ffd93e21154b8a9cf2722f2cc0f75dc39eff</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ff288722b76eba5209cdbf9158c6dfbf229b9129</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ff452614b91f4c9bd965150b1a82e7bf18f59334</th>\n",
       "      <td>2</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ff4d3e1c359cfbb73bcae07fa1eb62c45da2b161</th>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ff55d0c0b2a4f56aae87c2a21afb7070ab34383d</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ff6e82c763fe2443643e48a03e239eb635f406dc</th>\n",
       "      <td>14</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ff7a0f59ba022102ad22981141a7182c4d8273c3</th>\n",
       "      <td>7</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ff833869969184d86f870f98405e7988eccc2309</th>\n",
       "      <td>9</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ff979e07f9d906a32ba35a9b75fd9585f6306dbc</th>\n",
       "      <td>38</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ffaefa3a1bc2d074d9a14c9924d4e67a46c35410</th>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ffc6cfa435937ca0df967b44e9178439d04e3537</th>\n",
       "      <td>2</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ffc96f8fbb35aac4cb0029332b0fc78e7766bb5d</th>\n",
       "      <td>4</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ffe3d0543c9046d35c2ee3724ea9d774dff98a32</th>\n",
       "      <td>32</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fff9fc3ec67bd18ed57a34ed1e67410942c4cd81</th>\n",
       "      <td>10</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>fffb93a166547448a0ff0232558118d59395fecd</th>\n",
       "      <td>13</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "<p>5148 rows × 1 columns</p>\n",
       "</div>"
      ],
      "text/plain": [
       "                                          num_interactions\n",
       "email                                                     \n",
       "0000b6387a0366322d7fbfc6434af145adf7fed1                13\n",
       "001055fc0bb67f71e8fa17002342b256a30254cd                 4\n",
       "00148e4911c7e04eeff8def7bbbdaf1c59c2c621                 3\n",
       "001a852ecbd6cc12ab77a785efa137b2646505fe                 6\n",
       "001fc95b90da5c3cb12c501d201a915e4f093290                 2\n",
       "0042719415c4fca7d30bd2d4e9d17c5fc570de13                 2\n",
       "00772abe2d0b269b2336fc27f0f4d7cb1d2b65d7                 3\n",
       "008ba1d5b4ebf54babf516a2d5aa43e184865da5                10\n",
       "008ca24b82c41d513b3799d09ae276d37f92ce72                 1\n",
       "008dfc7a327b5186244caec48e0ab61610a0c660                13\n",
       "009af4e0537378bf8e8caf0ad0e2994f954d822e                 1\n",
       "00bda305223d05f6df5d77de41abd2a0c7d895fe                 4\n",
       "00c2d5190e8c6b821b0e3848bf56f6e47e428994                 3\n",
       "00ced21f957bbcee5edf7b107b2bd05628b04774                 4\n",
       "00d9337ecd5f70fba1c4c7a78e21b3532e0112c4                 3\n",
       "00e524e4f13137a6fac54f9c71d7769c6507ecde                11\n",
       "00f8341cbecd6af00ba8c78b3bb6ec49adf83248                 3\n",
       "00f946b14100f0605fa25089437ee9486378872c                 1\n",
       "01041260c97ab9221d923b0a2c525437f148d589                 2\n",
       "0108ce3220657a9a89a85bdec959b0f2976dd51c                 4\n",
       "011455e91a24c1fb815a4deac6b6eaf5ad16819e                 9\n",
       "01198c58d684d79c9026abe355cfb532cb524dc5                 1\n",
       "011ae4de07ffb332b0f51c155a35c23c80294962                35\n",
       "011fcfb582be9534e9a275336f7e7c3717100381                11\n",
       "0129dfcdb701b6e1d309934be6393004c6683a2d                15\n",
       "01327bbc4fd7bfe8ad62e599453d2876b928e725                 3\n",
       "01455f0ab0a5a22a93d94ad35f6e78431aa90625                 7\n",
       "014dedab269f1453c647598c92a3fa37b39eed97                 2\n",
       "014e4fe6e6c5eb3fe5ca0b16c16fb4599df6375c                 1\n",
       "01560f88312a91894d254e6406c25df19f0ad5e8                11\n",
       "...                                                    ...\n",
       "fe5396e3762c36767c9c915f7ed1731691d7e4b4                 1\n",
       "fe5480ff15f0ac51eeb2314a192351f168d7aad7                 1\n",
       "fe56a49b62752708ed2f6e30677c57881f7b78d1                15\n",
       "fe5885b80e91be887510a0b6dd04e011178d6364                 3\n",
       "fe5f9d7528518e00b0a73c7a3994afc335496961                 3\n",
       "fe66aa534c7824eca663b84b99a437a98a9b026e                 2\n",
       "fe69c72c964a8346dbc7763309c4e07d818d360f                 4\n",
       "fe88d1f683f308b32fb3d7554f007cc55cc48df5                 1\n",
       "fe8c1cb974e39d8ea8c005044e927b3f0de8acd0                 3\n",
       "fe90d98b0287090fe8e653bafba6ed3eff19331e                 1\n",
       "fe9327be39fd457df70e83d3fc8cba9b8b3f95b1                 1\n",
       "feaea388105a4ccc48795b191bbf0c26a23b1356                 4\n",
       "fef0c6be3a2ed226e1fb8a811b0ee68a389f6f3c                13\n",
       "fef28e45f7217026b2684d1783a2e18b061bdffb                 3\n",
       "fef3bc88def1aa787c99957ded7d5b2c0edc040e                 4\n",
       "ff27ffd93e21154b8a9cf2722f2cc0f75dc39eff                 1\n",
       "ff288722b76eba5209cdbf9158c6dfbf229b9129                 1\n",
       "ff452614b91f4c9bd965150b1a82e7bf18f59334                 2\n",
       "ff4d3e1c359cfbb73bcae07fa1eb62c45da2b161                 3\n",
       "ff55d0c0b2a4f56aae87c2a21afb7070ab34383d                 1\n",
       "ff6e82c763fe2443643e48a03e239eb635f406dc                14\n",
       "ff7a0f59ba022102ad22981141a7182c4d8273c3                 7\n",
       "ff833869969184d86f870f98405e7988eccc2309                 9\n",
       "ff979e07f9d906a32ba35a9b75fd9585f6306dbc                38\n",
       "ffaefa3a1bc2d074d9a14c9924d4e67a46c35410                 1\n",
       "ffc6cfa435937ca0df967b44e9178439d04e3537                 2\n",
       "ffc96f8fbb35aac4cb0029332b0fc78e7766bb5d                 4\n",
       "ffe3d0543c9046d35c2ee3724ea9d774dff98a32                32\n",
       "fff9fc3ec67bd18ed57a34ed1e67410942c4cd81                10\n",
       "fffb93a166547448a0ff0232558118d59395fecd                13\n",
       "\n",
       "[5148 rows x 1 columns]"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Number of interactions per user\n",
    "num_interactions_by_user = df[['email', 'article_id']].groupby('email').count()\n",
    "num_interactions_by_user.rename(columns = {'article_id':'num_interactions'}, inplace = True)\n",
    "num_interactions_by_user"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "50% of individuals interact with 3 number of articles or fewer.\n",
      "The maximum number of user-article interactions by any 1 user is 364.\n"
     ]
    }
   ],
   "source": [
    "# Fill in the median and maximum number of user_article interactios \n",
    "median_val = int(num_interactions_by_user.median()[0])\n",
    "print(f'50% of individuals interact with {median_val} number of articles or fewer.')\n",
    "max_views_by_user = num_interactions_by_user.max()[0]\n",
    "print(f'The maximum number of user-article interactions by any 1 user is {max_views_by_user}.')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`2.` Explore and remove duplicate articles from the **df_content** dataframe.  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "      <th>doc_full_name</th>\n",
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      "text/plain": [
       "Empty DataFrame\n",
       "Columns: [doc_body, doc_description, doc_full_name, doc_status, article_id]\n",
       "Index: []"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Find and explore duplicate articles\n",
    "df_content[df_content.duplicated() == True]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "      <th>50</th>\n",
       "      <td>Follow Sign in / Sign up Home About Insight Da...</td>\n",
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       "      <td>If you are like most data scientists, you are ...</td>\n",
       "      <td>Self-service data preparation with IBM Data Re...</td>\n",
       "      <td>Live</td>\n",
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       "      <td>Homepage Follow Sign in Get started * Home\\r\\n...</td>\n",
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       "      <td>This video shows you how to construct queries ...</td>\n",
       "      <td>This video shows you how to construct queries ...</td>\n",
       "      <td>Use the Primary Index</td>\n",
       "      <td>Live</td>\n",
       "      <td>577</td>\n",
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      "text/plain": [
       "                                              doc_body  \\\n",
       "50   Follow Sign in / Sign up Home About Insight Da...   \n",
       "365  Follow Sign in / Sign up Home About Insight Da...   \n",
       "221  * United States\\r\\n\\r\\nIBM® * Site map\\r\\n\\r\\n...   \n",
       "692  Homepage Follow Sign in / Sign up Homepage * H...   \n",
       "232  Homepage Follow Sign in Get started Homepage *...   \n",
       "971  Homepage Follow Sign in Get started * Home\\r\\n...   \n",
       "399  Homepage Follow Sign in Get started * Home\\r\\n...   \n",
       "761  Homepage Follow Sign in Get started Homepage *...   \n",
       "578  This video shows you how to construct queries ...   \n",
       "970  This video shows you how to construct queries ...   \n",
       "\n",
       "                                       doc_description  \\\n",
       "50                        Community Detection at Scale   \n",
       "365  During the seven-week Insight Data Engineering...   \n",
       "221  When used to make sense of huge amounts of con...   \n",
       "692  One of the earliest documented catalogs was co...   \n",
       "232  If you are like most data scientists, you are ...   \n",
       "971  If you are like most data scientists, you are ...   \n",
       "399  Today’s world of data science leverages data f...   \n",
       "761  Today’s world of data science leverages data f...   \n",
       "578  This video shows you how to construct queries ...   \n",
       "970  This video shows you how to construct queries ...   \n",
       "\n",
       "                                         doc_full_name doc_status  article_id  \n",
       "50                        Graph-based machine learning       Live          50  \n",
       "365                       Graph-based machine learning       Live          50  \n",
       "221  How smart catalogs can turn the big data flood...       Live         221  \n",
       "692  How smart catalogs can turn the big data flood...       Live         221  \n",
       "232  Self-service data preparation with IBM Data Re...       Live         232  \n",
       "971  Self-service data preparation with IBM Data Re...       Live         232  \n",
       "399  Using Apache Spark as a parallel processing fr...       Live         398  \n",
       "761  Using Apache Spark as a parallel processing fr...       Live         398  \n",
       "578                              Use the Primary Index       Live         577  \n",
       "970                              Use the Primary Index       Live         577  "
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Find duplicated article_ids\n",
    "df_content[df_content.duplicated('article_id', False) == True]. sort_values('article_id')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Remove any rows that have the same article_id - only keep the first\n",
    "df_content.drop_duplicates(subset='article_id', inplace=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`3.` Use the cells below to find:\n",
    "\n",
    "**a.** The number of unique articles that have an interaction with a user.  \n",
    "**b.** The number of unique articles in the dataset (whether they have any interactions or not).<br>\n",
    "**c.** The number of unique users in the dataset. (excluding null values) <br>\n",
    "**d.** The number of user-article interactions in the dataset."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [],
   "source": [
    "# The number of unique articles that have an interaction with a user\n",
    "unique_articles = len(df['article_id'].unique())\n",
    "\n",
    "# The number of unique articles in the dataset \n",
    "total_articles = df_content.shape[0]\n",
    "\n",
    "#The number of unique users in the dataset\n",
    "unique_users = num_interactions_by_user.shape[0]\n",
    "\n",
    "#The number of user-article interactions in the dataset.\n",
    "user_article_interactions = df.shape[0]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`4.` Use the cells below to find the most viewed **article_id**, as well as how often it was viewed.  After talking to the company leaders, the `email_mapper` function was deemed a reasonable way to map users to ids.  There were a small number of null values, and it was found that all of these null values likely belonged to a single user (which is how they are stored using the function below)."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [],
   "source": [
    "# The most viewed article in the dataset as a string with one value following the decimal \n",
    "most_viewed_article_id = str(df['article_id'].value_counts().index[0])\n",
    "    \n",
    "# Number of views of the most viewed article in the dataset \n",
    "max_views = df[~df['email'].isnull()]['article_id'].value_counts().max()\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
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       "      <th></th>\n",
       "      <th>article_id</th>\n",
       "      <th>title</th>\n",
       "      <th>user_id</th>\n",
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       "      <th>0</th>\n",
       "      <td>1430.0</td>\n",
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       "      <th>1</th>\n",
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       "      <th>2</th>\n",
       "      <td>1429.0</td>\n",
       "      <td>use deep learning for image classification</td>\n",
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       "      <td>1338.0</td>\n",
       "      <td>ml optimization using cognitive assistant</td>\n",
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       "   article_id                                              title  user_id\n",
       "0      1430.0  using pixiedust for fast, flexible, and easier...        1\n",
       "1      1314.0       healthcare python streaming application demo        2\n",
       "2      1429.0         use deep learning for image classification        3\n",
       "3      1338.0          ml optimization using cognitive assistant        4\n",
       "4      1276.0          deploy your python model as a restful api        5"
      ]
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     "execution_count": 11,
     "metadata": {},
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    }
   ],
   "source": [
    "def email_mapper():\n",
    "    '''maps the user email to a user_id column and removes the email column '''\n",
    "    coded_dict = dict()\n",
    "    cter = 1\n",
    "    email_encoded = []\n",
    "    \n",
    "    for val in df['email']:\n",
    "        if val not in coded_dict:\n",
    "            coded_dict[val] = cter\n",
    "            cter += 1\n",
    "        \n",
    "        email_encoded.append(coded_dict[val])\n",
    "    return email_encoded\n",
    "\n",
    "email_encoded = email_mapper()\n",
    "del df['email']\n",
    "df['user_id'] = email_encoded\n",
    "\n",
    "# show header\n",
    "df.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "It looks like you have everything right here! Nice job!\n"
     ]
    }
   ],
   "source": [
    "sol_1_dict = {\n",
    "    '`50% of individuals have _____ or fewer interactions.`': median_val,\n",
    "    '`The total number of user-article interactions in the dataset is ______.`': user_article_interactions,\n",
    "    '`The maximum number of user-article interactions by any 1 user is ______.`': max_views_by_user,\n",
    "    '`The most viewed article in the dataset was viewed _____ times.`': max_views,\n",
    "    '`The article_id of the most viewed article is ______.`': most_viewed_article_id,\n",
    "    '`The number of unique articles that have at least 1 rating ______.`': unique_articles,\n",
    "    '`The number of unique users in the dataset is ______`': unique_users,\n",
    "    '`The number of unique articles on the IBM platform`': total_articles\n",
    "}\n",
    "\n",
    "# Test your dictionary against the solution\n",
    "t.sol_1_test(sol_1_dict)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### <a class=\"anchor\" id=\"Rank\">Part II: Rank-Based Recommendations</a>\n",
    "\n",
    "Unlike in the earlier lessons, we don't actually have ratings for whether a user liked an article or not.  We only know that a user has interacted with an article.  In these cases, the popularity of an article can really only be based on how often an article was interacted with.\n",
    "\n",
    "`1.` Fill in the function below to return the **n** top articles ordered with most interactions as the top. Test your function using the tests below."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [],
   "source": [
    "def get_top_article_ids(n, df=df):\n",
    "    '''\n",
    "    INPUT:\n",
    "    n - (int) the number of top articles to return\n",
    "    df - (pandas dataframe) df as defined at the top of the notebook \n",
    "    6\n",
    "    OUTPUT:\n",
    "    top_articles - (list) A list of the top 'n' article ids \n",
    "    \n",
    "    '''\n",
    "    top_article_ids = [str(x) for x in df['article_id'].value_counts().index.tolist()[:n]]\n",
    " \n",
    "    return  top_article_ids\n",
    "\n",
    "def get_top_articles(n, df=df):\n",
    "    '''\n",
    "    INPUT:\n",
    "    n - (int) the number of top articles to return\n",
    "    df - (pandas dataframe) df as defined at the top of the notebook \n",
    "    \n",
    "    OUTPUT:\n",
    "    top_articles - (list) A list of the top 'n' article titles \n",
    "    \n",
    "    '''\n",
    "    top_n_article_ids = get_top_article_ids(n, df)\n",
    "    top_articles = df[df['article_id'].isin(top_n_article_ids)]['title'].unique().tolist()\n",
    "    \n",
    "    return top_articles \n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['healthcare python streaming application demo', 'use deep learning for image classification', 'apache spark lab, part 1: basic concepts', 'predicting churn with the spss random tree algorithm', 'analyze energy consumption in buildings', 'visualize car data with brunel', 'use xgboost, scikit-learn & ibm watson machine learning apis', 'gosales transactions for logistic regression model', 'insights from new york car accident reports', 'finding optimal locations of new store using decision optimization']\n",
      "['1429.0', '1330.0', '1431.0', '1427.0', '1364.0', '1314.0', '1293.0', '1170.0', '1162.0', '1304.0']\n"
     ]
    }
   ],
   "source": [
    "print(get_top_articles(10))\n",
    "print(get_top_article_ids(10))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Your top_5 looks like the solution list! Nice job.\n",
      "Your top_10 looks like the solution list! Nice job.\n",
      "Your top_20 looks like the solution list! Nice job.\n"
     ]
    }
   ],
   "source": [
    "# Test the function by returning the top 5, 10, and 20 articles\n",
    "top_5 = get_top_articles(5)\n",
    "top_10 = get_top_articles(10)\n",
    "top_20 = get_top_articles(20)\n",
    "\n",
    "# Test each of your three lists from above\n",
    "t.sol_2_test(get_top_articles)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### <a class=\"anchor\" id=\"User-User\">Part III: User-User Based Collaborative Filtering</a>\n",
    "\n",
    "\n",
    "`1.` Use the function below to reformat the **df** dataframe to be shaped with users as the rows and articles as the columns.  \n",
    "\n",
    "* Each **user** should only appear in each **row** once.\n",
    "\n",
    "\n",
    "* Each **article** should only show up in one **column**.  \n",
    "\n",
    "\n",
    "* **If a user has interacted with an article, then place a 1 where the user-row meets for that article-column**.  It does not matter how many times a user has interacted with the article, all entries where a user has interacted with an article should be a 1.  \n",
    "\n",
    "\n",
    "* **If a user has not interacted with an item, then place a zero where the user-row meets for that article-column**. \n",
    "\n",
    "Use the tests to make sure the basic structure of your matrix matches what is expected by the solution."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
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       "article_id  0.0     2.0     4.0     8.0     9.0     12.0    14.0    15.0    \\\n",
       "user_id                                                                      \n",
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       "user_id                                             \n",
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       "3                0       0       0       0       0  \n",
       "4                0       0       0       0       0  \n",
       "5                0       0       0       0       0  \n",
       "\n",
       "[5 rows x 714 columns]"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def create_user_item_matrix(df):\n",
    "    '''\n",
    "    INPUT:\n",
    "    df - pandas dataframe with article_id, title, user_id columns\n",
    "    \n",
    "    OUTPUT:\n",
    "    user_item - user item matrix \n",
    "    \n",
    "    Description:\n",
    "    Return a matrix with user ids as rows and article ids on the columns with 1 values where a user interacted with \n",
    "    an article and a 0 otherwise\n",
    "    '''\n",
    "    new_df = df.copy()\n",
    "    new_df.insert(3,'interaction_value', 1)\n",
    "    user_item = new_df.pivot_table(values='interaction_value',  index='user_id', columns='article_id').fillna(0).astype(int)\n",
    "    \n",
    "    return user_item # return the user_item matrix \n",
    "\n",
    "user_item = create_user_item_matrix(df)\n",
    "user_item.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "You have passed our quick tests!  Please proceed!\n"
     ]
    }
   ],
   "source": [
    "## Tests \n",
    "assert user_item.shape[0] == 5149, \"Oops!  The number of users in the user-article matrix doesn't look right.\"\n",
    "assert user_item.shape[1] == 714, \"Oops!  The number of articles in the user-article matrix doesn't look right.\"\n",
    "assert user_item.sum(axis=1)[1] == 36, \"Oops!  The number of articles seen by user 1 doesn't look right.\"\n",
    "print(\"You have passed our quick tests!  Please proceed!\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`2.` Complete the function below which should take a user_id and provide an ordered list of the most similar users to that user (from most similar to least similar).  The returned result should not contain the provided user_id, as we know that each user is similar to him/herself. Because the results for each user here are binary, it (perhaps) makes sense to compute similarity as the dot product of two users. \n",
    "\n",
    "Use the tests to test your function."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [],
   "source": [
    "def find_similar_users(user_id, user_item=user_item):\n",
    "    '''\n",
    "    INPUT:\n",
    "    user_id - (int) a user_id\n",
    "    user_item - (pandas dataframe) matrix of users by articles: \n",
    "                1's when a user has interacted with an article, 0 otherwise\n",
    "    \n",
    "    OUTPUT:\n",
    "    similar_users - (list) an ordered list where the closest users (largest dot product users)\n",
    "                    are listed first\n",
    "    \n",
    "    Description:\n",
    "    Computes the similarity of every pair of users based on the dot product\n",
    "    Returns an ordered list of the users in order from most to least similar\n",
    "    \n",
    "    '''\n",
    "    \n",
    "    # data as np arrays\n",
    "    user_id_vector_as_np = np.array(user_item.loc[user_id])\n",
    "    item_user_matrix_as_np = np.matrix.transpose(np.array(user_item))\n",
    "    \n",
    "    # compute similarity of each user to the provided user\n",
    "    dot_prod = np.dot(user_id_vector_as_np, item_user_matrix_as_np)\n",
    "    \n",
    "    # create dataframe for the user similarities\n",
    "\n",
    "    data = {'user_2': user_item.index.tolist(), 'similarity_to_user_1': dot_prod.tolist()}\n",
    "    user_similarities = pd.DataFrame(data)\n",
    "\n",
    "    # sort by similarity\n",
    "    user_similarities.sort_values('similarity_to_user_1', ascending = False, inplace=True)\n",
    "    \n",
    "    # remove the own user's id'\n",
    "    user_similarities = user_similarities[user_similarities['user_2'] != user_id] \n",
    "\n",
    "    # create list of just the ids\n",
    "    most_similar_users = list(user_similarities['user_2'])\n",
    "   \n",
    "    return most_similar_users \n",
    "        "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The 10 most similar users to user 1 are: [3933, 23, 3782, 203, 4459, 3870, 131, 4201, 46, 5041]\n",
      "The 5 most similar users to user 3933 are: [1, 23, 3782, 203, 4459]\n",
      "The 3 most similar users to user 46 are: [4201, 3782, 23]\n"
     ]
    }
   ],
   "source": [
    "# Spot check of the function\n",
    "print(\"The 10 most similar users to user 1 are: {}\".format(find_similar_users(1)[:10]))\n",
    "print(\"The 5 most similar users to user 3933 are: {}\".format(find_similar_users(3933)[:5]))\n",
    "print(\"The 3 most similar users to user 46 are: {}\".format(find_similar_users(46)[:3]))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`3.` Now that you have a function that provides the most similar users to each user, you will want to use these users to find articles you can recommend.  Complete the functions below to return the articles you would recommend to each user. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [],
   "source": [
    "def get_article_names(article_ids, df=df):\n",
    "    '''\n",
    "    INPUT:\n",
    "    article_ids - (list) a list of article ids\n",
    "    df - (pandas dataframe) df as defined at the top of the notebook\n",
    "    \n",
    "    OUTPUT:\n",
    "    article_names - (list) a list of article names associated with the list of article ids \n",
    "                    (this is identified by the title column)\n",
    "    '''\n",
    "    article_names = list(df[df['article_id'].isin(article_ids)]['title'].unique())\n",
    "    \n",
    "    return article_names\n",
    "\n",
    "\n",
    "def get_user_articles(user_id, user_item=user_item):\n",
    "    '''\n",
    "    INPUT:\n",
    "    user_id - (int) a user id\n",
    "    user_item - (pandas dataframe) matrix of users by articles: \n",
    "                1's when a user has interacted with an article, 0 otherwise\n",
    "    \n",
    "    OUTPUT:\n",
    "    article_ids - (list) a list of the article ids seen by the user\n",
    "    article_names - (list) a list of article names associated with the list of article ids \n",
    "                    (this is identified by the doc_full_name column in df_content)\n",
    "    \n",
    "    Description:\n",
    "    Provides a list of the article_ids and article titles that have been seen by a user\n",
    "    '''\n",
    "    article_ids = [str(x) for x in list(user_item.loc[user_id][user_item.loc[user_id] == 1].index.values)]\n",
    "    article_names = get_article_names(article_ids)\n",
    "    \n",
    "    return article_ids, article_names\n",
    "\n",
    "\n",
    "def user_user_recs(user_id, m=10):\n",
    "    '''\n",
    "    INPUT:\n",
    "    user_id - (int) a user id\n",
    "    m - (int) the number of recommendations you want for the user\n",
    "    \n",
    "    OUTPUT:\n",
    "    recs - (list) a list of recommendations for the user\n",
    "    \n",
    "    Description:\n",
    "    Loops through the users based on closeness to the input user_id\n",
    "    For each user - finds articles the user hasn't seen before and provides them as recs\n",
    "    Does this until m recommendations are found\n",
    "    \n",
    "    Notes:\n",
    "    Users who are the same closeness are chosen arbitrarily as the 'next' user\n",
    "    \n",
    "    For the user where the number of recommended articles starts below m \n",
    "    and ends exceeding m, the last items are chosen arbitrarily\n",
    "    \n",
    "    '''\n",
    "    \n",
    "    # get article_ids ans article_names from the article the user has allready interacted with\n",
    "    user_article_ids = get_user_articles(user_id)[0]\n",
    "    # find similar users\n",
    "    similar_users = find_similar_users(user_id)\n",
    "    \n",
    "    # Keep the recommended article \n",
    "    recommendations = np.array([])\n",
    "    \n",
    "    for similar_user in similar_users:\n",
    "        \n",
    "        # take the articles similar user has interacted with\n",
    "        similar_user_article_ids = get_user_articles(similar_user)[0]\n",
    "        \n",
    "        #Obtain recommendations for each neighbor\n",
    "        new_article_ids = np.setdiff1d(user_article_ids, similar_user_article_ids , assume_unique=True)\n",
    "        \n",
    "        # Update  recommendations with new_article_ids\n",
    "        recommendations = np.unique(np.concatenate([new_article_ids, recommendations], axis=0))\n",
    "        \n",
    "        # If we have enough recommendations exit the loop\n",
    "        if len(recommendations) > m-1:\n",
    "            break\n",
    "    \n",
    "    return recommendations[:m]  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['uci ml repository: chronic kidney disease data set',\n",
       " 'time series prediction using recurrent neural networks (lstms)',\n",
       " 'jupyter notebook tutorial',\n",
       " 'uci: iris',\n",
       " 'sector correlations shiny app',\n",
       " 'country statistics: life expectancy at birth',\n",
       " 'introduction to market basket analysis in\\xa0python',\n",
       " 'fighting gerrymandering: using data science to draw fairer congressional districts',\n",
       " 'categorize urban density',\n",
       " 'predict loan applicant behavior with tensorflow neural networking']"
      ]
     },
     "execution_count": 21,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Check Results\n",
    "get_article_names(user_user_recs(1, 10)) # Return 10 recommendations for user 1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "If this is all you see, you passed all of our tests!  Nice job!\n"
     ]
    }
   ],
   "source": [
    "# Test the function\n",
    "assert set(get_article_names(['1024.0', '1176.0', '1305.0', '1314.0', '1422.0', '1427.0'])) == set(['using deep learning to reconstruct high-resolution audio', 'build a python app on the streaming analytics service', 'gosales transactions for naive bayes model', 'healthcare python streaming application demo', 'use r dataframes & ibm watson natural language understanding', 'use xgboost, scikit-learn & ibm watson machine learning apis']), \"Oops! Your the get_article_names function doesn't work quite how we expect.\"\n",
    "assert set(get_article_names(['1320.0', '232.0', '844.0'])) == set(['housing (2015): united states demographic measures','self-service data preparation with ibm data refinery','use the cloudant-spark connector in python notebook']), \"Oops! Your the get_article_names function doesn't work quite how we expect.\"\n",
    "assert set(get_user_articles(20)[0]) == set(['1320.0', '232.0', '844.0'])\n",
    "assert set(get_user_articles(20)[1]) == set(['housing (2015): united states demographic measures', 'self-service data preparation with ibm data refinery','use the cloudant-spark connector in python notebook'])\n",
    "assert set(get_user_articles(2)[0]) == set(['1024.0', '1176.0', '1305.0', '1314.0', '1422.0', '1427.0'])\n",
    "assert set(get_user_articles(2)[1]) == set(['using deep learning to reconstruct high-resolution audio', 'build a python app on the streaming analytics service', 'gosales transactions for naive bayes model', 'healthcare python streaming application demo', 'use r dataframes & ibm watson natural language understanding', 'use xgboost, scikit-learn & ibm watson machine learning apis'])\n",
    "print(\"If this is all you see, you passed all of our tests!  Nice job!\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`4.` Now we are going to improve the consistency of the **user_user_recs** function from above.  \n",
    "\n",
    "* Instead of arbitrarily choosing when we obtain users who are all the same closeness to a given user - choose the users that have the most total article interactions before choosing those with fewer article interactions.\n",
    "\n",
    "\n",
    "* Instead of arbitrarily choosing articles from the user where the number of recommended articles starts below m and ends exceeding m, choose articles with the articles with the most total interactions before choosing those with fewer total interactions. This ranking should be  what would be obtained from the **top_articles** function you wrote earlier."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 50,
   "metadata": {},
   "outputs": [],
   "source": [
    "def get_top_sorted_users(user_id, df=df, user_item=user_item):\n",
    "    '''\n",
    "    INPUT:\n",
    "    user_id - (int)\n",
    "    df - (pandas dataframe) df as defined at the top of the notebook \n",
    "    user_item - (pandas dataframe) matrix of users by articles: \n",
    "            1's when a user has interacted with an article, 0 otherwise\n",
    "    \n",
    "            \n",
    "    OUTPUT:\n",
    "    neighbors_df - (pandas dataframe) a dataframe with:\n",
    "                    neighbor_id - is a neighbor user_id\n",
    "                    similarity - measure of the similarity of each user to the provided user_id\n",
    "                    num_interactions - the number of articles viewed by the user\n",
    "                    \n",
    "    Other Details - sort the neighbors_df by the similarity and then by number of interactions where \n",
    "                    highest of each is higher in the dataframe\n",
    "     \n",
    "    '''\n",
    "    \n",
    "    \n",
    "    # calculate number of interactions of each user and add it to neighbors frame\n",
    "    neighbors_df =  df['user_id'].value_counts().rename_axis('neighbor_id').reset_index(name='num_interactions')\n",
    "    neighbors_df.sort_values('neighbor_id', inplace=True)\n",
    "    \n",
    "    # data as np arrays\n",
    "    user_id_vector_as_np = np.array(user_item.loc[user_id])\n",
    "    item_user_matrix_as_np = np.matrix.transpose(np.array(user_item))\n",
    "    \n",
    "    # compute similarity of each user to the provided user\n",
    "    dot_prod = np.dot(user_id_vector_as_np, item_user_matrix_as_np)\n",
    "    \n",
    "    neighbors_df['similarity'] = dot_prod.tolist()\n",
    "    \n",
    "    neighbors_df.sort_values(['similarity','num_interactions'], ascending=False, inplace=True)\n",
    "     \n",
    "    # remove the own user's id'\n",
    "    neighbors_df = neighbors_df[neighbors_df['neighbor_id'] != user_id]\n",
    "    \n",
    "    return neighbors_df\n",
    "\n",
    "\n",
    "def user_user_recs_part2(user_id, m=10):\n",
    "    '''\n",
    "    INPUT:\n",
    "    user_id - (int) a user id\n",
    "    m - (int) the number of recommendations you want for the user\n",
    "    \n",
    "    OUTPUT:\n",
    "    recs - (list) a list of recommendations for the user by article id\n",
    "    rec_names - (list) a list of recommendations for the user by article title\n",
    "    \n",
    "    Description:\n",
    "    Loops through the users based on closeness to the input user_id\n",
    "    For each user - finds articles the user hasn't seen before and provides them as recs\n",
    "    Does this until m recommendations are found\n",
    "    \n",
    "    Notes:\n",
    "    * Choose the users that have the most total article interactions \n",
    "    before choosing those with fewer article interactions.\n",
    "\n",
    "    * Choose articles with the articles with the most total interactions \n",
    "    before choosing those with fewer total interactions. \n",
    "   \n",
    "    '''\n",
    "    \n",
    "    # get article_ids ans article_names from the article the user has allready interacted with\n",
    "    user_article_ids = get_user_articles(user_id)[0]\n",
    "    \n",
    "    # find similar users\n",
    "    similar_users = get_top_sorted_users(user_id)['neighbor_id'].tolist()\n",
    "    \n",
    "    # Keep the recommended article \n",
    "    recs = np.array([])\n",
    "    \n",
    "    for similar_user in similar_users:\n",
    "        \n",
    "        # take the articles similar user has interacted with\n",
    "        similar_user_article_ids = get_user_articles(similar_user)[0]\n",
    "        \n",
    "        #Obtain recommendations for each neighbor\n",
    "        new_article_ids = np.setdiff1d(user_article_ids, similar_user_article_ids , assume_unique=True)\n",
    "        \n",
    "        # Update  recommendations with new_article_ids\n",
    "        recs = np.unique(np.concatenate([new_article_ids, recs], axis=0))\n",
    "        \n",
    "        # If we have enough recommendations exit the loop\n",
    "        if len(recs) > m-1:\n",
    "            break\n",
    "    \n",
    "    if len(recs) > m:\n",
    "        # take artikel which have the most interactions\n",
    "        article_interactions = df[df['article_id'].isin(recs)]['article_id'].value_counts().index.tolist()\n",
    "        recs = [str(x) for x in article_interactions[:m]]\n",
    "    rec_names = get_article_names(recs)\n",
    "    \n",
    "    return recs, rec_names"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 51,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The top 10 recommendations for user 20 are the following article ids:\n",
      "['151.0', '1400.0', '390.0', '732.0', '1183.0', '268.0', '525.0', '310.0', '329.0', '1406.0']\n",
      "\n",
      "The top 10 recommendations for user 20 are the following article names:\n",
      "['uci ml repository: chronic kidney disease data set', 'time series prediction using recurrent neural networks (lstms)', 'jupyter notebook tutorial', 'rapidly build machine learning flows with dsx', 'uci: iris', 'sector correlations shiny app', 'new shiny cheat sheet and video tutorial', 'introduction to market basket analysis in\\xa0python', 'categorize urban density', 'introducing ibm watson studio ']\n"
     ]
    }
   ],
   "source": [
    "# Quick spot check\n",
    "rec_ids, rec_names = user_user_recs_part2(1, 10)\n",
    "print(\"The top 10 recommendations for user 20 are the following article ids:\")\n",
    "print(rec_ids)\n",
    "print()\n",
    "print(\"The top 10 recommendations for user 20 are the following article names:\")\n",
    "print(rec_names)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`5.` Use your functions from above to correctly fill in the solutions to the dictionary below.  Then test your dictionary against the solution.  Provide the code you need to answer each following the comments below."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 52,
   "metadata": {},
   "outputs": [],
   "source": [
    "### Tests with a dictionary of results\n",
    "user1_most_sim = get_top_sorted_users(1)['neighbor_id'].tolist()[0] # Find the user that is most similar to user 1 \n",
    "user131_10th_sim = get_top_sorted_users(131)['neighbor_id'].tolist()[9] # Find the 10th most similar user to user 131"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 53,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "This all looks good!  Nice job!\n"
     ]
    }
   ],
   "source": [
    "## Dictionary Test \n",
    "sol_5_dict = {\n",
    "    'The user that is most similar to user 1.': user1_most_sim, \n",
    "    'The user that is the 10th most similar to user 131': user131_10th_sim,\n",
    "}\n",
    "\n",
    "t.sol_5_test(sol_5_dict)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`6.` If we were given a new user, which of the above functions would you be able to use to make recommendations?  Explain.  Can you think of a better way we might make recommendations?  Use the cell below to explain a better method for new users."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Provide your response here.**\n",
    "\n",
    "Answer: None of the both recomender functions in Part III: User-User Based Collaborative Filtering , this functions need the interaction of users, since the user is new, we don't know anything abouth this user and don't have any interaction data for ths user. In this this case it would make sence to make a combined aproach for recomendations, for example if we have a known user: recommendation using collaborative filtering and for new user use: Rank-Based Recommendations and recommend the most popular articles. This is just one possible solution, there are also other methods, which could be used for example Machine-Learning-Based Recommendations.\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`7.` Using your existing functions, provide the top 10 recommended articles you would provide for the a new user below.  You can test your function against our thoughts to make sure we are all on the same page with how we might make a recommendation."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 54,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['1429.0', '1330.0', '1431.0', '1427.0', '1364.0', '1314.0', '1293.0', '1170.0', '1162.0', '1304.0']\n"
     ]
    }
   ],
   "source": [
    "new_user = '0.0'\n",
    "\n",
    "# list of the top 10 article ids to recommend \n",
    "new_user_recs = get_top_article_ids(10)\n",
    "print(new_user_recs)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 55,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "That's right!  Nice job!\n"
     ]
    }
   ],
   "source": [
    "assert set(new_user_recs) == set(['1314.0','1429.0','1293.0','1427.0','1162.0','1364.0','1304.0','1170.0','1431.0','1330.0']), \"Oops!  It makes sense that in this case we would want to recommend the most popular articles, because we don't know anything about these users.\"\n",
    "\n",
    "print(\"That's right!  Nice job!\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### <a class=\"anchor\" id=\"Content-Recs\">Part IV: Content Based Recommendations (EXTRA - NOT REQUIRED)</a>\n",
    "\n",
    "Another method we might use to make recommendations is to perform a ranking of the highest ranked articles associated with some term.  You might consider content to be the **doc_body**, **doc_description**, or **doc_full_name**.  There isn't one way to create a content based recommendation, especially considering that each of these columns hold content related information.  \n",
    "\n",
    "`1.` Use the function body below to create a content based recommender.  Since there isn't one right answer for this recommendation tactic, no test functions are provided.  Feel free to change the function inputs if you decide you want to try a method that requires more input values.  The input values are currently set with one idea in mind that you may use to make content based recommendations.  One additional idea is that you might want to choose the most popular recommendations that meet your 'content criteria', but again, there is a lot of flexibility in how you might make these recommendations.\n",
    "\n",
    "### This part is NOT REQUIRED to pass this project.  However, you may choose to take this on as an extra way to show off your skills."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def make_content_recs():\n",
    "    '''\n",
    "    INPUT:\n",
    "    \n",
    "    OUTPUT:\n",
    "    \n",
    "    '''"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`2.` Now that you have put together your content-based recommendation system, use the cell below to write a summary explaining how your content based recommender works.  Do you see any possible improvements that could be made to your function?  Is there anything novel about your content based recommender?\n",
    "\n",
    "### This part is NOT REQUIRED to pass this project.  However, you may choose to take this on as an extra way to show off your skills."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Write an explanation of your content based recommendation system here.**"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`3.` Use your content-recommendation system to make recommendations for the below scenarios based on the comments.  Again no tests are provided here, because there isn't one right answer that could be used to find these content based recommendations.\n",
    "\n",
    "### This part is NOT REQUIRED to pass this project.  However, you may choose to take this on as an extra way to show off your skills."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# make recommendations for a brand new user\n",
    "\n",
    "\n",
    "# make a recommendations for a user who only has interacted with article id '1427.0'\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### <a class=\"anchor\" id=\"Matrix-Fact\">Part V: Matrix Factorization</a>\n",
    "\n",
    "In this part of the notebook, you will build use matrix factorization to make article recommendations to the users on the IBM Watson Studio platform.\n",
    "\n",
    "`1.` You should have already created a **user_item** matrix above in **question 1** of **Part III** above.  This first question here will just require that you run the cells to get things set up for the rest of **Part V** of the notebook. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 56,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Load the matrix\n",
    "user_item_matrix = pd.read_pickle('user_item_matrix.p')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 57,
   "metadata": {},
   "outputs": [
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       "article_id  0.0  100.0  1000.0  1004.0  1006.0  1008.0  101.0  1014.0  1015.0  \\\n",
       "user_id                                                                         \n",
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       "\n",
       "article_id  1016.0  ...    977.0  98.0  981.0  984.0  985.0  986.0  990.0  \\\n",
       "user_id             ...                                                     \n",
       "1              0.0  ...      0.0   0.0    1.0    0.0    0.0    0.0    0.0   \n",
       "2              0.0  ...      0.0   0.0    0.0    0.0    0.0    0.0    0.0   \n",
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       "4              0.0  ...      0.0   0.0    0.0    0.0    0.0    0.0    0.0   \n",
       "5              0.0  ...      0.0   0.0    0.0    0.0    0.0    0.0    0.0   \n",
       "\n",
       "article_id  993.0  996.0  997.0  \n",
       "user_id                          \n",
       "1             0.0    0.0    0.0  \n",
       "2             0.0    0.0    0.0  \n",
       "3             0.0    0.0    0.0  \n",
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       "\n",
       "[5 rows x 714 columns]"
      ]
     },
     "execution_count": 57,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# quick look at the matrix\n",
    "user_item_matrix.head()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`2.` In this situation, you can use Singular Value Decomposition from [numpy](https://docs.scipy.org/doc/numpy-1.14.0/reference/generated/numpy.linalg.svd.html) on the user-item matrix.  Use the cell to perform SVD, and explain why this is different than in the lesson."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 58,
   "metadata": {},
   "outputs": [
    {
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       "          6.00245107e+00,   5.98865778e+00,   5.96981173e+00,\n",
       "          5.96066667e+00,   5.93584006e+00,   5.88738844e+00,\n",
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       "          5.82207158e+00,   5.78835052e+00,   5.77230349e+00,\n",
       "          5.75247863e+00,   5.73248156e+00,   5.70414494e+00,\n",
       "          5.70350083e+00,   5.68447651e+00,   5.66670739e+00,\n",
       "          5.65713461e+00,   5.61679181e+00,   5.60583162e+00,\n",
       "          5.58725591e+00,   5.57313212e+00,   5.53267945e+00,\n",
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       "          4.60961205e+00,   4.59337688e+00,   4.58622380e+00,\n",
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       "          3.02858899e+00,   3.01198157e+00,   2.99657852e+00,\n",
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       "          2.42101957e+00,   2.40895291e+00,   2.39176455e+00,\n",
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       "          2.31076457e+00,   2.30152967e+00,   2.29179930e+00,\n",
       "          2.29166856e+00,   2.28120204e+00,   2.27193089e+00,\n",
       "          2.25834323e+00,   2.25310784e+00,   2.23791393e+00,\n",
       "          2.23074938e+00,   2.22475822e+00,   2.21669665e+00,\n",
       "          2.21086883e+00,   2.19127974e+00,   2.18470277e+00,\n",
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       "          2.14220931e+00,   2.13315549e+00,   2.11725659e+00,\n",
       "          2.10776972e+00,   2.09552989e+00,   2.09077554e+00,\n",
       "          2.07588643e+00,   2.07438003e+00,   2.06299073e+00,\n",
       "          2.05301240e+00,   2.03619233e+00,   2.02379345e+00,\n",
       "          2.01485936e+00,   2.00858207e+00,   1.99861610e+00,\n",
       "          1.99537789e+00,   1.96417523e+00,   1.95874234e+00,\n",
       "          1.95435504e+00,   1.94813566e+00,   1.93960031e+00,\n",
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       "          1.90721084e+00,   1.89201878e+00,   1.87902208e+00,\n",
       "          1.86512209e+00,   1.85949693e+00,   1.85809402e+00,\n",
       "          1.83862972e+00,   1.83709038e+00,   1.82292300e+00,\n",
       "          1.80962973e+00,   1.79939288e+00,   1.79498641e+00,\n",
       "          1.78516123e+00,   1.76936451e+00,   1.76367540e+00,\n",
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       "          1.73853051e+00,   1.72961438e+00,   1.71640328e+00,\n",
       "          1.70789308e+00,   1.69747501e+00,   1.69136455e+00,\n",
       "          1.68771024e+00,   1.67316665e+00,   1.66886095e+00,\n",
       "          1.64761890e+00,   1.63630945e+00,   1.63070917e+00,\n",
       "          1.62423427e+00,   1.61462495e+00,   1.60500711e+00,\n",
       "          1.58958746e+00,   1.58567210e+00,   1.57404822e+00,\n",
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       "          1.50507953e+00,   1.49657495e+00,   1.48700541e+00,\n",
       "          1.48282660e+00,   1.48034701e+00,   1.45417472e+00,\n",
       "          1.44638689e+00,   1.43708481e+00,   1.43079690e+00,\n",
       "          1.42705387e+00,   1.40253243e+00,   1.38961745e+00,\n",
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       "          1.35621822e+00,   1.33974671e+00,   1.33385383e+00,\n",
       "          1.33181740e+00,   1.32289038e+00,   1.31151825e+00,\n",
       "          1.30266774e+00,   1.29575171e+00,   1.28972572e+00,\n",
       "          1.27395791e+00,   1.26319111e+00,   1.25992490e+00,\n",
       "          1.24380681e+00,   1.23016975e+00,   1.23005940e+00,\n",
       "          1.21715372e+00,   1.20767744e+00,   1.19808258e+00,\n",
       "          1.19486895e+00,   1.17830756e+00,   1.16606520e+00,\n",
       "          1.16331107e+00,   1.15263219e+00,   1.15010409e+00,\n",
       "          1.13549495e+00,   1.13429860e+00,   1.11607200e+00,\n",
       "          1.10713485e+00,   1.10663241e+00,   1.09438820e+00,\n",
       "          1.09059946e+00,   1.08067651e+00,   1.07506271e+00,\n",
       "          1.06658024e+00,   1.06159999e+00,   1.05658342e+00,\n",
       "          1.04777664e+00,   1.03810761e+00,   1.03299165e+00,\n",
       "          1.02799203e+00,   1.02132735e+00,   1.01299848e+00,\n",
       "          1.00799704e+00,   1.00000000e+00,   1.00000000e+00,\n",
       "          9.97151293e-01,   9.95646653e-01,   9.92377954e-01,\n",
       "          9.91093970e-01,   9.88720232e-01,   9.87577772e-01,\n",
       "          9.86873498e-01,   9.78684152e-01,   9.78097749e-01,\n",
       "          9.75592917e-01,   9.73164909e-01,   9.70631406e-01,\n",
       "          9.66533661e-01,   9.60145188e-01,   9.55902675e-01,\n",
       "          9.52086327e-01,   9.48015987e-01,   9.44924709e-01,\n",
       "          9.28371887e-01,   9.09968959e-01,   9.08495993e-01,\n",
       "          9.05365913e-01,   8.96691589e-01,   8.81762234e-01,\n",
       "          8.65122835e-01,   8.53057696e-01,   8.48314426e-01,\n",
       "          8.39616121e-01,   8.33471361e-01,   8.23228199e-01,\n",
       "          8.12138781e-01,   7.97612585e-01,   7.84907175e-01,\n",
       "          7.71300265e-01,   7.60149739e-01,   7.56924159e-01,\n",
       "          7.51075704e-01,   7.43328867e-01,   7.25717885e-01,\n",
       "          7.15666246e-01,   7.04395015e-01,   6.99101196e-01,\n",
       "          6.91625676e-01,   6.78114990e-01,   6.73228217e-01,\n",
       "          6.59772497e-01,   6.56037259e-01,   6.42698362e-01,\n",
       "          6.26688782e-01,   6.15608898e-01,   6.11677828e-01,\n",
       "          6.09907904e-01,   5.94162404e-01,   5.82797981e-01,\n",
       "          5.81314355e-01,   5.76307450e-01,   5.17766691e-01,\n",
       "          4.98033321e-01,   4.93127928e-01,   4.87002388e-01,\n",
       "          4.74889484e-01,   4.54666156e-01,   4.42244880e-01,\n",
       "          4.01197648e-01,   3.96104245e-01,   3.68386761e-01,\n",
       "          3.52762180e-01,   3.25557926e-01,   3.00974784e-01,\n",
       "          2.82709464e-01,   2.68497243e-01,   2.45784298e-14,\n",
       "          4.38358974e-15,   4.38358974e-15,   4.38358974e-15,\n",
       "          4.38358974e-15,   4.38358974e-15,   4.38358974e-15,\n",
       "          1.35360768e-15,   7.67704043e-16,   7.63703710e-16]),\n",
       " array([[ -2.21822365e-03,  -1.13697491e-03,  -8.25820256e-03, ...,\n",
       "          -7.89214713e-03,  -2.78398235e-02,  -3.49679488e-04],\n",
       "        [  2.07736845e-03,   3.86642452e-04,   1.51981454e-03, ...,\n",
       "          -1.56120895e-02,   9.70825293e-04,  -4.30034249e-04],\n",
       "        [ -4.32111291e-04,   2.46676561e-03,   4.28288891e-03, ...,\n",
       "           1.20613591e-02,   1.21832171e-02,   1.08416259e-03],\n",
       "        ..., \n",
       "        [  0.00000000e+00,   3.15631941e-16,   1.84475856e-16, ...,\n",
       "           5.48706963e-17,   9.44710455e-17,   1.23662293e-16],\n",
       "        [  0.00000000e+00,  -2.38531913e-16,   2.65894675e-18, ...,\n",
       "           1.71338757e-16,   7.09063975e-17,  -1.89755859e-16],\n",
       "        [  0.00000000e+00,   2.26402240e-17,   3.39637767e-16, ...,\n",
       "          -7.85447059e-17,  -6.56620070e-17,  -9.63564231e-17]]))"
      ]
     },
     "execution_count": 58,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Perform SVD on the User-Item Matrix \n",
    "u, s, vt = np.linalg.svd(user_item_matrix)\n",
    "u, s, vt"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 59,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "((5149, 5149), (714,), (714, 714))"
      ]
     },
     "execution_count": 59,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "u.shape, s.shape, vt.shape"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Provide your response here.**\n",
    "\n",
    "Answer: we can use the SVD here, because there is no missing values,  whereas in the lessons we were not able to use SVD because it hat some missing values and rather used FunkSVD"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`3.` Now for the tricky part, how do we choose the number of latent features to use?  Running the below cell, you can see that as the number of latent features increases, we obtain a lower error rate on making predictions for the 1 and 0 values in the user-item matrix.  Run the cell below to get an idea of how the accuracy improves as we increase the number of latent features."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 60,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "image/png": 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\n",
      "text/plain": [
       "<matplotlib.figure.Figure at 0x7f4381274470>"
      ]
     },
     "metadata": {
      "needs_background": "light"
     },
     "output_type": "display_data"
    }
   ],
   "source": [
    "num_latent_feats = np.arange(10,700+10,20)\n",
    "sum_errs = []\n",
    "\n",
    "for k in num_latent_feats:\n",
    "    # restructure with k latent features\n",
    "    s_new, u_new, vt_new = np.diag(s[:k]), u[:, :k], vt[:k, :]\n",
    "    \n",
    "    # take dot product\n",
    "    user_item_est = np.around(np.dot(np.dot(u_new, s_new), vt_new))\n",
    "    \n",
    "    # compute error for each prediction to actual value\n",
    "    diffs = np.subtract(user_item_matrix, user_item_est)\n",
    "    \n",
    "    # total errors and keep track of them\n",
    "    err = np.sum(np.sum(np.abs(diffs)))\n",
    "    sum_errs.append(err)\n",
    "    \n",
    "    \n",
    "plt.plot(num_latent_feats, 1 - np.array(sum_errs)/df.shape[0]);\n",
    "plt.xlabel('Number of Latent Features');\n",
    "plt.ylabel('Accuracy');\n",
    "plt.title('Accuracy vs. Number of Latent Features');"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`4.` From the above, we can't really be sure how many features to use, because simply having a better way to predict the 1's and 0's of the matrix doesn't exactly give us an indication of if we are able to make good recommendations.  Instead, we might split our dataset into a training and test set of data, as shown in the cell below.  \n",
    "\n",
    "Use the code from question 3 to understand the impact on accuracy of the training and test sets of data with different numbers of latent features. Using the split below: \n",
    "\n",
    "* How many users can we make predictions for in the test set?  \n",
    "* How many users are we not able to make predictions for because of the cold start problem?\n",
    "* How many articles can we make predictions for in the test set?  \n",
    "* How many articles are we not able to make predictions for because of the cold start problem?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 124,
   "metadata": {},
   "outputs": [],
   "source": [
    "df_train = df.head(40000)\n",
    "df_test = df.tail(5993)\n",
    "\n",
    "def create_test_and_train_user_item(df_train, df_test):\n",
    "    '''\n",
    "    INPUT:\n",
    "    df_train - training dataframe\n",
    "    df_test - test dataframe\n",
    "    \n",
    "    OUTPUT:\n",
    "    user_item_train - a user-item matrix of the training dataframe \n",
    "                      (unique users for each row and unique articles for each column)\n",
    "    user_item_test - a user-item matrix of the testing dataframe \n",
    "                    (unique users for each row and unique articles for each column)\n",
    "    test_idx - all of the test user ids\n",
    "    test_arts - all of the test article ids\n",
    "    \n",
    "    '''\n",
    "    user_item_train = user_item_matrix[user_item_matrix.index.isin(df_train['user_id'])]\n",
    "    user_item_test = user_item_matrix[user_item_matrix.index.isin(df_test['user_id'])]\n",
    "    test_idx = set(user_item_test.index)\n",
    "    test_arts = set(user_item_test.columns)\n",
    "    \n",
    "    return user_item_train, user_item_test, test_idx, test_arts\n",
    "\n",
    "user_item_train, user_item_test, test_idx, test_arts = create_test_and_train_user_item(df_train, df_test)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 62,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "20"
      ]
     },
     "execution_count": 62,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# How many users can we make predictions for in the test set?\n",
    "train_idx = set(user_item_train.index)\n",
    "num_test_user_pred_possible = len(test_idx.intersection(train_idx))\n",
    "num_test_user_pred_possible"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 63,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "662"
      ]
     },
     "execution_count": 63,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# How many users in the test set are we not able to make predictions for because of the cold start problem?\n",
    "num_user_test = len(test_idx)\n",
    "num_test_user_pred_not_possible = num_user_test - num_test_user_pred_possible\n",
    "num_test_user_pred_not_possible"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 65,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "714"
      ]
     },
     "execution_count": 65,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# How many articles can we make predictions for in the test set?\n",
    "train_arts = set(user_item_train.columns)\n",
    "num_test_arts_pred_possible = len(test_arts.intersection(train_arts))\n",
    "num_test_arts_pred_possible"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 66,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "0"
      ]
     },
     "execution_count": 66,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# How many articles in the test set are we not able to make predictions for because of the cold start problem?\n",
    "num_arts_test = len(test_arts)\n",
    "num_test_arts_pred_not_possible = num_arts_test - num_test_arts_pred_possible\n",
    "num_test_arts_pred_not_possible"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 67,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Awesome job!  That's right!  All of the test articles are in the training data, but there are only 20 test users that were also in the training set.  All of the other users that are in the test set we have no data on.  Therefore, we cannot make predictions for these users using SVD.\n"
     ]
    }
   ],
   "source": [
    "a = 662 \n",
    "b = 574 \n",
    "c = 20 \n",
    "d = 0 \n",
    "\n",
    "\n",
    "sol_4_dict = {\n",
    "    'How many users can we make predictions for in the test set?': c, \n",
    "    'How many users in the test set are we not able to make predictions for because of the cold start problem?': a, \n",
    "    'How many articles can we make predictions for in the test set?': b,\n",
    "    'How many articles in the test set are we not able to make predictions for because of the cold start problem?':d\n",
    "}\n",
    "\n",
    "t.sol_4_test(sol_4_dict)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`5.` Now use the **user_item_train** dataset from above to find U, S, and V transpose using SVD. Then find the subset of rows in the **user_item_test** dataset that you can predict using this matrix decomposition with different numbers of latent features to see how many features makes sense to keep based on the accuracy on the test data. This will require combining what was done in questions `2` - `4`.\n",
    "\n",
    "Use the cells below to explore how well SVD works towards making predictions for recommendations on the test data.  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 68,
   "metadata": {},
   "outputs": [],
   "source": [
    "# fit SVD on the user_item_train matrix\n",
    "u_train, s_train, vt_train = np.linalg.svd(user_item_train)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 90,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<div>\n",
       "<style scoped>\n",
       "    .dataframe tbody tr th:only-of-type {\n",
       "        vertical-align: middle;\n",
       "    }\n",
       "\n",
       "    .dataframe tbody tr th {\n",
       "        vertical-align: top;\n",
       "    }\n",
       "\n",
       "    .dataframe thead th {\n",
       "        text-align: right;\n",
       "    }\n",
       "</style>\n",
       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th>article_id</th>\n",
       "      <th>0.0</th>\n",
       "      <th>100.0</th>\n",
       "      <th>1000.0</th>\n",
       "      <th>1004.0</th>\n",
       "      <th>1006.0</th>\n",
       "      <th>1008.0</th>\n",
       "      <th>101.0</th>\n",
       "      <th>1014.0</th>\n",
       "      <th>1015.0</th>\n",
       "      <th>1016.0</th>\n",
       "      <th>...</th>\n",
       "      <th>977.0</th>\n",
       "      <th>98.0</th>\n",
       "      <th>981.0</th>\n",
       "      <th>984.0</th>\n",
       "      <th>985.0</th>\n",
       "      <th>986.0</th>\n",
       "      <th>990.0</th>\n",
       "      <th>993.0</th>\n",
       "      <th>996.0</th>\n",
       "      <th>997.0</th>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>user_id</th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>5</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>6</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>7</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>8</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>9</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>10</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>11</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>12</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>13</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>14</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>15</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>16</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>17</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>18</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>19</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>20</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>21</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>22</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>23</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>24</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>25</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>26</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>27</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>28</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>29</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>30</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>...</th>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "      <td>...</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4458</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4459</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4460</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4461</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4462</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4463</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4464</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4465</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4466</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4467</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4468</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4469</th>\n",
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       "  </tbody>\n",
       "</table>\n",
       "<p>4487 rows × 714 columns</p>\n",
       "</div>"
      ],
      "text/plain": [
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       "user_id                                                                         \n",
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       "\n",
       "[4487 rows x 714 columns]"
      ]
     },
     "execution_count": 90,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "user_item_train"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 69,
   "metadata": {},
   "outputs": [
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       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3527</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3532</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3684</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3740</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3777</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3801</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3968</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3989</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3990</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3998</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4002</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4204</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4231</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>1.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4274</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4293</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4487</th>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>...</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
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       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "      <td>0.0</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "<p>20 rows × 714 columns</p>\n",
       "</div>"
      ],
      "text/plain": [
       "article_id  0.0  100.0  1000.0  1004.0  1006.0  1008.0  101.0  1014.0  1015.0  \\\n",
       "user_id                                                                         \n",
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       "user_id                          \n",
       "2917          0.0    0.0    0.0  \n",
       "3024          0.0    0.0    0.0  \n",
       "3093          0.0    0.0    0.0  \n",
       "3193          0.0    0.0    0.0  \n",
       "3527          0.0    0.0    0.0  \n",
       "3532          0.0    0.0    0.0  \n",
       "3684          0.0    0.0    0.0  \n",
       "3740          0.0    0.0    0.0  \n",
       "3777          0.0    0.0    0.0  \n",
       "3801          0.0    0.0    0.0  \n",
       "3968          0.0    1.0    0.0  \n",
       "3989          0.0    0.0    0.0  \n",
       "3990          0.0    0.0    0.0  \n",
       "3998          0.0    1.0    0.0  \n",
       "4002          0.0    0.0    0.0  \n",
       "4204          0.0    0.0    0.0  \n",
       "4231          0.0    0.0    0.0  \n",
       "4274          0.0    0.0    0.0  \n",
       "4293          0.0    0.0    0.0  \n",
       "4487          0.0    0.0    0.0  \n",
       "\n",
       "[20 rows x 714 columns]"
      ]
     },
     "execution_count": 69,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# get subset of the testset\n",
    "user_item_test_subset = user_item_test[user_item_test.index.isin(train_idx)]\n",
    "user_item_test_subset"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 123,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<function matplotlib.pyplot.show(*args, **kw)>"
      ]
     },
     "execution_count": 123,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "image/png": 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\n",
      "text/plain": [
       "<matplotlib.figure.Figure at 0x7f436a3d2b38>"
      ]
     },
     "metadata": {
      "needs_background": "light"
     },
     "output_type": "display_data"
    }
   ],
   "source": [
    "# get a subset of the test data included in train_data \n",
    "user_item_test_subset = user_item_test[user_item_test.index.isin(train_idx)]\n",
    "\n",
    "num_latent_feats = np.arange(10,700+10,20)\n",
    "sum_train_errs = []\n",
    "sum_test_errs = []\n",
    "\n",
    "for k in num_latent_feats:\n",
    "    # restructure with k latent features\n",
    "    s_new, u_new, vt_new = np.diag(s_train[:k]), u_train[:, :k], vt_train[:k, :]\n",
    "    \n",
    "    # take dot product\n",
    "    user_item_est = np.around(np.dot(np.dot(u_new, s_new), vt_new))\n",
    "    \n",
    "    # compute error for each prediction to actual value \n",
    "    diffs_train_vs_est = np.subtract(user_item_train, user_item_est)\n",
    "    \n",
    "    # total errors and keep track of them\n",
    "    train_err = np.sum(np.sum(np.abs(diffs_train_vs_est)))\n",
    "    sum_train_errs.append(train_err)\n",
    "    \n",
    "    # calculate test error\n",
    "    test_est = pd.DataFrame(user_item_est)\n",
    "    \n",
    "    # get the indicies of the rows contained in train in test\n",
    "    user_item_subset_row_indicies = [x-1 for x in user_item_test_subset.index]\n",
    "    \n",
    "    # compute error for each prediction to actual value\n",
    "    diffs_test_vs_est = np.subtract(user_item_test_subset, test_est.iloc[user_item_subset_row_indicies])\n",
    "    \n",
    "    test_err = np.sum(np.sum(np.abs(diffs_test_vs_est)))\n",
    "    sum_test_errs.append(test_err)\n",
    "    \n",
    "plt.plot(num_latent_feats, 1 - np.array(sum_train_errs)/(user_item_train.shape[0]*user_item_test.shape[1]), label='Train')\n",
    "plt.plot(num_latent_feats, 1 - np.array(sum_test_errs)/(user_item_test.shape[0]*user_item_test.shape[1]), label='Test')\n",
    "plt.xlabel('Number of Latent Features');\n",
    "plt.ylabel('Accuracy');\n",
    "plt.title('Accuracy vs. Number of Latent Features');\n",
    "plt.legend\n",
    "plt.show"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true
   },
   "source": [
    "`6.` Use the cell below to comment on the results you found in the previous question. Given the circumstances of your results, discuss what you might do to determine if the recommendations you make with any of the above recommendation systems are an improvement to how users currently find articles? "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Your response here.**\n",
    "How many features makes sense to keep based on the accuracy on the test data?\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true
   },
   "source": [
    "<a id='conclusions'></a>\n",
    "### Extras\n",
    "Using your workbook, you could now save your recommendations for each user, develop a class to make new predictions and update your results, and make a flask app to deploy your results.  These tasks are beyond what is required for this project.  However, from what you learned in the lessons, you certainly capable of taking these tasks on to improve upon your work here!\n",
    "\n",
    "\n",
    "## Conclusion\n",
    "\n",
    "> Congratulations!  You have reached the end of the Recommendations with IBM project! \n",
    "\n",
    "> **Tip**: Once you are satisfied with your work here, check over your report to make sure that it is satisfies all the areas of the [rubric](https://review.udacity.com/#!/rubrics/2322/view). You should also probably remove all of the \"Tips\" like this one so that the presentation is as polished as possible.\n",
    "\n",
    "\n",
    "## Directions to Submit\n",
    "\n",
    "> Before you submit your project, you need to create a .html or .pdf version of this notebook in the workspace here. To do that, run the code cell below. If it worked correctly, you should get a return code of 0, and you should see the generated .html file in the workspace directory (click on the orange Jupyter icon in the upper left).\n",
    "\n",
    "> Alternatively, you can download this report as .html via the **File** > **Download as** submenu, and then manually upload it into the workspace directory by clicking on the orange Jupyter icon in the upper left, then using the Upload button.\n",
    "\n",
    "> Once you've done this, you can submit your project by clicking on the \"Submit Project\" button in the lower right here. This will create and submit a zip file with this .ipynb doc and the .html or .pdf version you created. Congratulations! "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "from subprocess import call\n",
    "call(['python', '-m', 'nbconvert', 'Recommendations_with_IBM.ipynb'])"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.6.3"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}