docs: add pinecone example (#109)

.env

@@ -20,3 +20,7 @@ SERP_API_KEY=
 
 # For using MongoDB Atlas (store)
 MONGODB_URI=
+
+# For using Pinecone (store)
+PINECONE_API_KEY=
+PINECONE_HOST=

examples/store-pinecone-similarity-search.php

@@ -0,0 +1,68 @@
+<?php
+
+use PhpLlm\LlmChain\Chain;
+use PhpLlm\LlmChain\Document\Document;
+use PhpLlm\LlmChain\Document\Metadata;
+use PhpLlm\LlmChain\DocumentEmbedder;
+use PhpLlm\LlmChain\Message\Message;
+use PhpLlm\LlmChain\Message\MessageBag;
+use PhpLlm\LlmChain\OpenAI\Model\Embeddings;
+use PhpLlm\LlmChain\OpenAI\Model\Gpt;
+use PhpLlm\LlmChain\OpenAI\Model\Gpt\Version;
+use PhpLlm\LlmChain\OpenAI\Platform\OpenAI;
+use PhpLlm\LlmChain\Store\Pinecone\Store;
+use PhpLlm\LlmChain\ToolBox\ChainProcessor;
+use PhpLlm\LlmChain\ToolBox\Tool\SimilaritySearch;
+use PhpLlm\LlmChain\ToolBox\ToolAnalyzer;
+use PhpLlm\LlmChain\ToolBox\ToolBox;
+use Probots\Pinecone\Pinecone;
+use Symfony\Component\Dotenv\Dotenv;
+use Symfony\Component\HttpClient\HttpClient;
+use Symfony\Component\Uid\Uuid;
+
+require_once dirname(__DIR__).'/vendor/autoload.php';
+(new Dotenv())->loadEnv(dirname(__DIR__).'/.env');
+
+if (empty($_ENV['OPENAI_API_KEY']) || empty($_ENV['PINECONE_API_KEY']) || empty($_ENV['PINECONE_HOST'])) {
+    echo 'Please set OPENAI_API_KEY, PINECONE_API_KEY and PINECONE_HOST environment variables.'.PHP_EOL;
+    exit(1);
+}
+
+// initialize the store
+$store = new Store(Pinecone::client($_ENV['PINECONE_API_KEY'], $_ENV['PINECONE_HOST']));
+
+// our data
+$movies = [
+    ['title' => 'Inception', 'description' => 'A skilled thief is given a chance at redemption if he can successfully perform inception, the act of planting an idea in someone\'s subconscious.', 'director' => 'Christopher Nolan'],
+    ['title' => 'The Matrix', 'description' => 'A hacker discovers the world he lives in is a simulated reality and joins a rebellion to overthrow its controllers.', 'director' => 'The Wachowskis'],
+    ['title' => 'The Godfather', 'description' => 'The aging patriarch of an organized crime dynasty transfers control of his empire to his reluctant son.', 'director' => 'Francis Ford Coppola'],
+];
+
+// create embeddings and documents
+foreach ($movies as $movie) {
+    $documents[] = Document::fromText(
+        id: Uuid::v4(),
+        text: 'Title: '.$movie['title'].PHP_EOL.'Director: '.$movie['director'].PHP_EOL.$movie['description'],
+        metadata: new Metadata($movie),
+    );
+}
+
+// create embeddings for documents
+$platform = new OpenAI(HttpClient::create(), $_ENV['OPENAI_API_KEY']);
+$embedder = new DocumentEmbedder($embeddings = new Embeddings($platform), $store);
+$embedder->embed($documents);
+
+$llm = new Gpt($platform, Version::gpt4oMini());
+
+$similaritySearch = new SimilaritySearch($embeddings, $store);
+$toolBox = new ToolBox(new ToolAnalyzer(), [$similaritySearch]);
+$processor = new ChainProcessor($toolBox);
+$chain = new Chain($llm, [$processor], [$processor]);
+
+$messages = new MessageBag(
+    Message::forSystem('Please answer all user questions only using SimilaritySearch function.'),
+    Message::ofUser('Which movie fits the theme of the mafia?')
+);
+$response = $chain->call($messages);
+
+echo $response.PHP_EOL;

src/Store/Pinecone/Store.php

@@ -11,6 +11,7 @@
 use Probots\Pinecone\Client;
 use Probots\Pinecone\Resources\Data\VectorResource;
 use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
 use Symfony\Component\Uid\Uuid;
 
 final readonly class Store implements VectorStoreInterface
@@ -20,7 +21,7 @@
      */
     public function __construct(
         private Client $pinecone,
-        private LoggerInterface $logger,
+        private LoggerInterface $logger = new NullLogger(),
         private ?string $namespace = null,
         private array $filter = [],
         private int $topK = 3,