Enhance gpu doc with PIP install oneAPI (#10109)

* Add pip install oneapi instructions

* Fixes

* Add instruction for oneapi2023

* Runtime config

* Fixes

* Remove "Currently, oneAPI installed with .. "

* Add pip package version for oneAPI 2024

* Reviewer comments

* Fix errors

docs/readthedocs/source/doc/LLM/Overview/install_gpu.md

@@ -172,6 +172,38 @@ BigDL-LLM for GPU supports on Linux has been verified on:
       Intel® oneAPI Base Toolkit 2024.0 installation methods:
 
       .. tabs::
+         .. tab:: PIP installer
+
+            Step 1: Install oneAPI in a user-defined folder, e.g., ``~/intel/oneapi``.
+
+            .. code-block:: bash
+
+               export PYTHONUSERBASE=~/intel/oneapi
+               pip install dpcpp-cpp-rt==2024.0.2 mkl-dpcpp==2024.0.0 onednn==2024.0.0 --user
+
+            .. note::
+
+               The oneAPI packages are visible in ``pip list`` only if ``PYTHONUSERBASE`` is properly set.
+
+            Step 2: Configure your working conda environment (e.g. with name ``llm``) to append ~/intel/oneapi/lib to environment variable LD_LIBRARY_PATH
+
+            .. code-block:: bash
+
+               conda env config vars set LD_LIBRARY_PATH=$LD_LIBRARY_PATH:~/intel/oneapi/lib -n llm
+
+            .. note::
+               You can view the configured environment variables for ``llm`` by running ``conda env config vars list -n llm``.
+               You can continue with activating the conda environment ``llm`` and installing ``bigdl-llm``.
+
+            .. note::
+
+               You can uninstall the package by simply deleting the package folder, and unsetting the configuration of your working conda environment (e.g., with name ``llm``). Thus, you are recommended to not install other pip packages in this folder.
+               
+               .. code-block:: bash
+               
+                  rm -r ~/intel/oneapi
+                  conda env config vars unset LD_LIBRARY_PATH -n llm
+
          .. tab:: APT installer
 
             Step 1: Set up repository
@@ -232,6 +264,38 @@ BigDL-LLM for GPU supports on Linux has been verified on:
       Intel® oneAPI Base Toolkit 2023.2 installation methods:
 
       .. tabs::
+         .. tab:: PIP installer
+
+            Step 1: Install oneAPI in a user-defined folder, e.g., ``~/intel/oneapi``
+
+            .. code-block:: bash
+
+               export PYTHONUSERBASE=~/intel/oneapi
+               pip install dpcpp-cpp-rt==2023.2.0 mkl-dpcpp==2023.2.0 onednn-cpu-dpcpp-gpu-dpcpp==2023.2.0 --user
+
+            .. note::
+
+               The oneAPI packages are visible in ``pip list`` only if ``PYTHONUSERBASE`` is properly set.
+
+            Step 2: Configure your working conda environment (e.g. with name ``llm``) to append ~/intel/oneapi/lib to environment variable LD_LIBRARY_PATH
+
+            .. code-block:: bash
+
+               conda env config vars set LD_LIBRARY_PATH=$LD_LIBRARY_PATH:~/intel/oneapi/lib -n llm
+
+            .. note::
+               You can view the configured environment variables for ``llm`` by running ``conda env config vars list -n llm``.
+               You can continue with activating the conda environment ``llm`` and installing ``bigdl-llm``.
+
+            .. note::
+
+               You can uninstall the package by simply deleting the package folder, and unsetting the configuration of your working conda environment (e.g., with name ``llm``). Thus, you are recommended to not install other pip packages in this folder.
+               
+               .. code-block:: bash
+               
+                  rm -r ~/intel/oneapi
+                  conda env config vars unset LD_LIBRARY_PATH -n llm
+
          .. tab:: APT installer
 
             Step 1: Set up repository
@@ -397,7 +461,7 @@ To use GPU acceleration on Linux, several environment variables are required or
 
       .. code-block:: bash
 
-         # Required step. Configure oneAPI environment variables
+         # Required step for APT or offline installed oneAPI. Configure oneAPI environment variables. Skip this step for pip-installed oneAPI since LD_LIBRARY_PATH has already been configured.
          source /opt/intel/oneapi/setvars.sh
 
          # Recommended Environment Variables
@@ -410,8 +474,7 @@ To use GPU acceleration on Linux, several environment variables are required or
 
       .. code-block:: bash
 
-         # Required step. Configure oneAPI environment variables
-         source /opt/intel/oneapi/setvars.sh
+         # Required step for APT or offline installed oneAPI. Configure oneAPI environment variables. Skip this step for pip-installed oneAPI since LD_LIBRARY_PATH has already been configured.
 
          # Recommended Environment Variables
          export LD_PRELOAD=${LD_PRELOAD}:${CONDA_PREFIX}/lib/libtcmalloc.so
@@ -457,5 +520,6 @@ Error: libmkl_sycl_blas.so.4: cannot open shared object file: No such file or di
 
 The reason for such errors is that oneAPI has not been initialized properly before running BigDL-LLM code or before importing IPEX package.
 
-* Step 1: Make sure you execute setvars.sh of oneAPI Base Toolkit before running BigDL-LLM code.
+* Step 1: For oneAPI installed using APT or Offline Installer, make sure you execute setvars.sh of oneAPI Base Toolkit before running BigDL-LLM code. 
+For PIP-installed oneAPI, run ``echo $LD_LIBRARY_PATH``. If the output does not contain ``<oneAPI_folder>/lib``, check `Prerequisites`_. to install oneAPI with PIP installer again
 * Step 2: Make sure you install matching versions of BigDL-LLM/pytorch/IPEX and oneAPI Base Toolkit. BigDL-LLM with PyTorch 2.1 should be used with oneAPI Base Toolkit version 2024.0. BigDL-LLM with PyTorch 2.0 should be used with oneAPI Base Toolkit version 2023.2.