Welcome to Intel® Extension for PyTorch* Documentation!

Intel® Extension for PyTorch* extends PyTorch* with the latest performance optimizations for Intel hardware. Optimizations take advantage of Intel® Advanced Vector Extensions 512 (Intel® AVX-512) Vector Neural Network Instructions (VNNI) and Intel® Advanced Matrix Extensions (Intel® AMX) on Intel CPUs as well as Intel X^eMatrix Extensions (XMX) AI engines on Intel discrete GPUs. Moreover, Intel® Extension for PyTorch* provides easy GPU acceleration for Intel discrete GPUs through the PyTorch* xpu device.

The extension can be loaded as a Python module for Python programs or linked as a C++ library for C++ programs. In Python scripts, users can enable it dynamically by importing intel_extension_for_pytorch.

Note

GPU features are not included in CPU-only packages.
Optimizations for CPU-only may have a newer code base due to different development schedules.

In the current technological landscape, Generative AI (GenAI) workloads and models have gained widespread attention and popularity. Large Language Models (LLMs) have emerged as the dominant models driving these GenAI applications. Starting from 2.1.0, specific optimizations for certain LLM models are introduced in the Intel® Extension for PyTorch*.

Intel® Extension for PyTorch* has been released as an open–source project at Github. You can find the source code and instructions on how to get started at:

CPU: CPU main branch | Get Started
XPU: XPU main branch | Get Started

Architecture

Intel® Extension for PyTorch* is structured as shown in the following figure:

Eager Mode: In the eager mode, the PyTorch frontend is extended with custom Python modules (such as fusion modules), optimal optimizers, and INT8 quantization APIs. Further performance improvement is achieved by converting eager-mode models into graph mode using extended graph fusion passes.
Graph Mode: In the graph mode, fusions reduce operator/kernel invocation overhead, resulting in improved performance. Compared to the eager mode, the graph mode in PyTorch* normally yields better performance from the optimization techniques like operation fusion. Intel® Entension for PyTorch* amplifies them with more comprehensive graph optimizations. Both PyTorch Torchscript and TorchDynamo graph modes are supported. With Torchscript, we recommend using torch.jit.trace() as your preferred option, as it generally supports a wider range of workloads compared to torch.jit.script(). With TorchDynamo, ipex backend is available to provide good performances.
CPU Optimization: On CPU, Intel® Extension for PyTorch* automatically dispatches operators to underlying kernels based on detected ISA. The extension leverages vectorization and matrix acceleration units available on Intel hardware. The runtime extension offers finer-grained thread runtime control and weight sharing for increased efficiency.
GPU Optimization: On GPU, optimized operators and kernels are implemented and registered through PyTorch dispatching mechanism. These operators and kernels are accelerated from native vectorization feature and matrix calculation feature of Intel GPU hardware. Intel® Extension for PyTorch* for GPU utilizes the DPC++ compiler that supports the latest SYCL* standard and also a number of extensions to the SYCL* standard, which can be found in the sycl/doc/extensions directory.

Support

The team tracks bugs and enhancement requests using GitHub issues. Before submitting a suggestion or bug report, search the existing GitHub issues to see if your issue has already been reported.