Tensors and Dynamic neural networks in Python with strong GPU acceleration


PyTorch Logo

PyTorch is a Python package that provides two high-level features:

  • Tensor computation (like NumPy) with strong GPU acceleration
  • Deep neural networks built on a tape-based autograd system

You can reuse your favorite Python packages such as NumPy, SciPy, and Cython to extend PyTorch when needed.

System 3.6 3.7 3.8
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Windows CPU / GPU Build Status
Linux (ppc64le) CPU Build Status
Linux (ppc64le) GPU Build Status
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See also the ci.pytorch.org HUD.

More About PyTorch

At a granular level, PyTorch is a library that consists of the following components:

Component Description
torch a Tensor library like NumPy, with strong GPU support
torch.autograd a tape-based automatic differentiation library that supports all differentiable Tensor operations in torch
torch.jit a compilation stack (TorchScript) to create serializable and optimizable models from PyTorch code
torch.nn a neural networks library deeply integrated with autograd designed for maximum flexibility
torch.multiprocessing Python multiprocessing, but with magical memory sharing of torch Tensors across processes. Useful for data loading and Hogwild training
torch.utils DataLoader and other utility functions for convenience

Usually, PyTorch is used either as:

  • A replacement for NumPy to use the power of GPUs.
  • A deep learning research platform that provides maximum flexibility and speed.

Elaborating Further:

A GPU-Ready Tensor Library

If you use NumPy, then you have used Tensors (a.k.a. ndarray).

Tensor illustration

PyTorch provides Tensors that can live either on the CPU or the GPU and accelerates the computation by a huge amount.

We provide a wide variety of tensor routines to accelerate and fit your scientific computation needs such as slicing, indexing, math operations, linear algebra, reductions. And they are fast!

Dynamic Neural Networks: Tape-Based Autograd

PyTorch has a unique way of building neural networks: using and replaying a tape recorder.

Most frameworks such as TensorFlow, Theano, Caffe, and CNTK have a static view of the world. One has to build a neural network and reuse the same structure again and again. Changing the way the network behaves means that one has to start from scratch.

With PyTorch, we use a technique called reverse-mode auto-differentiation, which allows you to change the way your network behaves arbitrarily with zero lag or overhead. Our inspiration comes from several research papers on this topic, as well as current and past work such as torch-autograd, autograd, Chainer, etc.

While this technique is not unique to PyTorch, it's one of the fastest implementations of it to date. You get the best of speed and flexibility for your crazy research.

Dynamic graph

Python First

PyTorch is not a Python binding into a monolithic C++ framework. It is built to be deeply integrated into Python. You can use it naturally like you would use NumPy / SciPy / scikit-learn etc. You can write your new neural network layers in Python itself, using your favorite libraries and use packages such as Cython and Numba. Our goal is to not reinvent the wheel where appropriate.

Imperative Experiences

PyTorch is designed to be intuitive, linear in thought, and easy to use. When you execute a line of code, it gets executed. There isn't an asynchronous view of the world. When you drop into a debugger or receive error messages and stack traces, understanding them is straightforward. The stack trace points to exactly where your code was defined. We hope you never spend hours debugging your code because of bad stack traces or asynchronous and opaque execution engines.

Fast and Lean

PyTorch has minimal framework overhead. We integrate acceleration libraries such as Intel MKL and NVIDIA (cuDNN, NCCL) to maximize speed. At the core, its CPU and GPU Tensor and neural network backends (TH, THC, THNN, THCUNN) are mature and have been tested for years.

Hence, PyTorch is quite fast – whether you run small or large neural networks.

The memory usage in PyTorch is extremely efficient compared to Torch or some of the alternatives. We've written custom memory allocators for the GPU to make sure that your deep learning models are maximally memory efficient. This enables you to train bigger deep learning models than before.

Extensions Without Pain

Writing new neural network modules, or interfacing with PyTorch's Tensor API was designed to be straightforward and with minimal abstractions.

You can write new neural network layers in Python using the torch API or your favorite NumPy-based libraries such as SciPy.

If you want to write your layers in C/C++, we provide a convenient extension API that is efficient and with minimal boilerplate. No wrapper code needs to be written. You can see a tutorial here and an example here.



Commands to install from binaries via Conda or pip wheels are on our website: https://pytorch.org

NVIDIA Jetson Platforms

Python wheels for NVIDIA's Jetson Nano, Jetson TX2, and Jetson AGX Xavier are available via the following URLs:

They require JetPack 4.2 and above, and @dusty-nv maintains them

From Source

If you are installing from source, you will need Python 3.6.2 or later and a C++14 compiler. Also, we highly recommend installing an Anaconda environment. You will get a high-quality BLAS library (MKL) and you get controlled dependency versions regardless of your Linux distro.

Once you have Anaconda installed, here are the instructions.

If you want to compile with CUDA support, install

If you want to disable CUDA support, export environment variable USE_CUDA=0. Other potentially useful environment variables may be found in setup.py.

If you are building for NVIDIA's Jetson platforms (Jetson Nano, TX1, TX2, AGX Xavier), Instructions to install PyTorch for Jetson Nano are available here

Install Dependencies


conda install numpy ninja pyyaml mkl mkl-include setuptools cmake cffi typing_extensions future six requests dataclasses

On Linux

# Add LAPACK support for the GPU if needed
conda install -c pytorch magma-cuda110  # or the magma-cuda* that matches your CUDA version from https://anaconda.org/pytorch/repo

On MacOS

# Add these packages if torch.distributed is needed
conda install pkg-config libuv

On Windows

# Add these packages if torch.distributed is needed.
# Distributed package support on Windows is a prototype feature and is subject to changes.
conda install -c conda-forge libuv=1.39

Get the PyTorch Source

git clone --recursive https://github.com/pytorch/pytorch
cd pytorch
# if you are updating an existing checkout
git submodule sync
git submodule update --init --recursive

Install PyTorch

On Linux

export CMAKE_PREFIX_PATH=${CONDA_PREFIX:-"$(dirname $(which conda))/../"}
python setup.py install

Note that if you are using Anaconda, you may experience an error caused by the linker:

build/temp.linux-x86_64-3.7/torch/csrc/stub.o: file not recognized: file format not recognized
collect2: error: ld returned 1 exit status
error: command 'g++' failed with exit status 1

This is caused by ld from Conda environment shadowing the system ld. You should use a newer version of Python that fixes this issue. The recommended Python version is 3.6.10+, 3.7.6+ and 3.8.1+.

On macOS

export CMAKE_PREFIX_PATH=${CONDA_PREFIX:-"$(dirname $(which conda))/../"}
MACOSX_DEPLOYMENT_TARGET=10.9 CC=clang CXX=clang++ python setup.py install

Each CUDA version only supports one particular XCode version. The following combinations have been reported to work with PyTorch.

CUDA version XCode version
10.0 XCode 9.4
10.1 XCode 10.1

On Windows

Build with CPU

It's fairly easy to build with CPU. Visual Studio 2019 version 16.7.6 (MSVC toolchain version 14.27) or higher is recommended.

Build with CUDA

NVTX is needed to build Pytorch with CUDA. NVTX is a part of CUDA distributive, where it is called "Nsight Compute". To install it onto already installed CUDA run CUDA installation once again and check the corresponding checkbox. Make sure that CUDA with Nsight Compute is installed after Visual Studio.

Currently, VS 2017 / 2019, and Ninja are supported as the generator of CMake. If ninja.exe is detected in PATH, then Ninja will be used as the default generator, otherwise, it will use VS 2017 / 2019.
If Ninja is selected as the generator, the latest MSVC will get selected as the underlying toolchain.

CUDA, MSVC, and PyTorch versions are interdependent; please install matching versions from this table:

CUDA version Newest supported VS version PyTorch version
9.2 Visual Studio 2017 Update 5 (15.5) (_MSC_VER <= 1912) 0.4.1 ~ 1.5.1
10.1 Visual Studio 2019 (16.X) (_MSC_VER < 1930) 1.3.0 ~ 1.7.0
10.2 Visual Studio 2019 (16.X) (_MSC_VER < 1930) 1.5.0 ~ 1.7.0
11.0 Visual Studio 2019 (16.X) (_MSC_VER < 1930) 1.7.0

Note: There's a compilation issue in several Visual Studio 2019 versions since 16.7.1, so please make sure your Visual Studio 2019 version is not in 16.7.1 ~ 16.7.5

Additional libraries such as Magma, oneDNN, a.k.a MKLDNN or DNNL, and Sccache are often needed. Please refer to the installation-helper to install them.

You can refer to the build_pytorch.bat script for some other environment variables configurations


:: [Optional] If you want to build with the VS 2017 generator for old CUDA and PyTorch, please change the value in the next line to `Visual Studio 15 2017`.
:: Note: This value is useless if Ninja is detected. However, you can force that by using `set USE_NINJA=OFF`.
set CMAKE_GENERATOR=Visual Studio 16 2019

:: Read the content in the previous section carefully before you proceed.
:: [Optional] If you want to override the underlying toolset used by Ninja and Visual Studio with CUDA, please run the following script block.
:: "Visual Studio 2019 Developer Command Prompt" will be run automatically.
:: Make sure you have CMake >= 3.12 before you do this when you use the Visual Studio generator.
for /f "usebackq tokens=*" %i in (`"%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe" -version [15^,16^) -products * -latest -property installationPath`) do call "%i\VC\Auxiliary\Build\vcvarsall.bat" x64 -vcvars_ver=%CMAKE_GENERATOR_TOOLSET_VERSION%

:: [Optional] If you want to override the CUDA host compiler
set CUDAHOSTCXX=C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\bin\HostX64\x64\cl.exe

python setup.py install
Adjust Build Options (Optional)

You can adjust the configuration of cmake variables optionally (without building first), by doing the following. For example, adjusting the pre-detected directories for CuDNN or BLAS can be done with such a step.

On Linux

export CMAKE_PREFIX_PATH=${CONDA_PREFIX:-"$(dirname $(which conda))/../"}
python setup.py build --cmake-only
ccmake build  # or cmake-gui build

On macOS

export CMAKE_PREFIX_PATH=${CONDA_PREFIX:-"$(dirname $(which conda))/../"}
MACOSX_DEPLOYMENT_TARGET=10.9 CC=clang CXX=clang++ python setup.py build --cmake-only
ccmake build  # or cmake-gui build

Docker Image

Using pre-built images

You can also pull a pre-built docker image from Docker Hub and run with docker v19.03+

docker run --gpus all --rm -ti --ipc=host pytorch/pytorch:latest

Please note that PyTorch uses shared memory to share data between processes, so if torch multiprocessing is used (e.g. for multithreaded data loaders) the default shared memory segment size that container runs with is not enough, and you should increase shared memory size either with --ipc=host or --shm-size command line options to nvidia-docker run.

Building the image yourself

NOTE: Must be built with a docker version > 18.06

The Dockerfile is supplied to build images with Cuda support and cuDNN v7. You can pass PYTHON_VERSION=x.y make variable to specify which Python version is to be used by Miniconda, or leave it unset to use the default.

make -f docker.Makefile
# images are tagged as docker.io/${your_docker_username}/pytorch

Building the Documentation

To build documentation in various formats, you will need Sphinx and the readthedocs theme.

cd docs/
pip install -r requirements.txt

You can then build the documentation by running make <format> from the docs/ folder. Run make to get a list of all available output formats.

If you get a katex error run npm install katex. If it persists, try npm install -g katex

Previous Versions

Installation instructions and binaries for previous PyTorch versions may be found on Our Website.

Getting Started

Three-pointers to get you started:



Releases and Contributing

PyTorch has a 90-day release cycle (major releases). Please let us know if you encounter a bug by filing an issue.

We appreciate all contributions. If you are planning to contribute back bug-fixes, please do so without any further discussion.

If you plan to contribute new features, utility functions, or extensions to the core, please first open an issue and discuss the feature with us. Sending a PR without discussion might end up resulting in a rejected PR because we might be taking the core in a different direction than you might be aware of.

To learn more about making a contribution to Pytorch, please see our Contribution page.

The Team

PyTorch is a community-driven project with several skillful engineers and researchers contributing to it.

PyTorch is currently maintained by Adam Paszke, Sam Gross, Soumith Chintala and Gregory Chanan with major contributions coming from hundreds of talented individuals in various forms and means. A non-exhaustive but growing list needs to mention: Trevor Killeen, Sasank Chilamkurthy, Sergey Zagoruyko, Adam Lerer, Francisco Massa, Alykhan Tejani, Luca Antiga, Alban Desmaison, Andreas Koepf, James Bradbury, Zeming Lin, Yuandong Tian, Guillaume Lample, Marat Dukhan, Natalia Gimelshein, Christian Sarofeen, Martin Raison, Edward Yang, Zachary Devito.

Note: This project is unrelated to hughperkins/pytorch with the same name. Hugh is a valuable contributor to the Torch community and has helped with many things Torch and PyTorch.


PyTorch has a BSD-style license, as found in the LICENSE file.

  • Simplify OpenMP detection in CMake

    Simplify OpenMP detection in CMake

    We greatly simplify the handing of OpenMP in CMake by using caffe2::openmp target thoroughly. We follow the old behavior by defaulting to MKL OMP library and detecting OMP flags otherwise.

    open source 
    opened by cyyever 1
  • [inductor] Rewrite Triton templates + epilogue fusion (retry)

    [inductor] Rewrite Triton templates + epilogue fusion (retry)

    This reverts commit 94262efc7d381ace82aa74ed2f5f5ec76f8fca95

    cc @mlazos @soumith @voznesenskym @yanboliang @penguinwu @anijain2305 @EikanWang @jgong5 @Guobing-Chen @chunyuan-w @XiaobingSuper @zhuhaozhe @blzheng @Xia-Weiwen @wenzhe-nrv @jiayisunx @peterbell10 @desertfire

    ciflow/trunk skip-pr-sanity-checks module: inductor module: dynamo ciflow/inductor 
    opened by jansel 3
  • Add BlockWise Distribution Support to the torch.distributions Package

    Add BlockWise Distribution Support to the torch.distributions Package

    🚀 The feature, motivation and pitch

    I am requesting the addition of BlockWise distribution support to the torch.distributions package in PyTorch. By "BlockWise distribution", I am referring to distributions for which the event dimensions have separate, distinct and independent distributions.

    For example, consider an n-dimensional event space, where each dimension is independently distributed according to a separate distribution. A BlockWise distribution would allow users to specify and sample from this type of distribution using the torch.distributions API.

    This type of distribution can be useful in a variety of applications, such as factorizing a complex distribution into a product of simpler distributions, or modeling distributions over high-dimensional event spaces. The particular use case I have in mind is to create separate distributions for a radial and angular coordinate (say a MixtureSameFamily and a Uniform distribution to create multiple rings), then use a Transform (Bijector) to recover cartesian coordinates.

    It would be great if PyTorch could provide support for BlockWise distributions through the torch.distributions package.

    Here is how my particular example would look like

    import numpy as np
    import torch
    import torch.distributions as tfd
    def rings(modes: int = 4, mode_width: float = 0.1, inner_radius: float = 1., outer_radius = 10.):
        Concentric rings distribution
            :param modes: Number of concentric rings in the mixture
            :param inner_radius: Size of the smallest ring.
            :param outer_radius: Size of the largest ring.
            :param mode_width: Width of the modes (radial coordinate only)
        r = torch.linspace(inner_radius, outer_radius, modes)
        mixture = tfd.Categorical(probs=torch.ones(modes), validate_args=False)
        component = tfd.Normal(loc=r, scale=mode_width, validate_args=False)
        r_distribution = tfd.MixtureSameFamily(mixture, component, validate_args=False)
        theta_distribution = tfd.Uniform(low=-np.pi, high=np.pi, validate_args=False)
        return tfd.TransformedDistribution(
            base_distribution=tfd.BlockWise([r_distribution, theta_distribution]),

    Thank you for considering this feature request!


    No response

    Additional context

    No response

    opened by AlexandreAdam 0
  • Quantizing nn.MultiheadAttention does not copy batch_first attribute

    Quantizing nn.MultiheadAttention does not copy batch_first attribute

    🐛 Describe the bug

    In the example below when torch.quantization.prepare is used to prepare a multihead attention module for quantization the batch_first attribute is not faithfully copied -- the first print prints True but the second prints False.

    import torch.nn.functional as F
    import torch.nn as nn
    import torch
    class TransformerDecoderLayer(nn.Module):
        def __init__(self, d_model, nhead, dropout=0.1):
            self.self_attn = nn.MultiheadAttention(d_model, nhead, dropout=dropout, batch_first=True)
    qmodel = TransformerDecoderLayer(512, 8)
    quantization_config = torch.quantization.get_default_qconfig("fbgemm")
    qmodel.qconfig = quantization_config
    qmodel = torch.quantization.prepare(qmodel, inplace=False)


    PyTorch version: 1.13.0+cu117 Is debug build: False CUDA used to build PyTorch: 11.7 ROCM used to build PyTorch: N/A

    OS: Ubuntu 22.04.1 LTS (x86_64) GCC version: (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0 Clang version: Could not collect CMake version: version 3.22.1 Libc version: glibc-2.35

    Python version: 3.9.13 (main, Aug 25 2022, 23:26:10) [GCC 11.2.0] (64-bit runtime) Python platform: Linux-5.15.0-1026-aws-x86_64-with-glibc2.35 Is CUDA available: True CUDA runtime version: Could not collect CUDA_MODULE_LOADING set to: LAZY GPU models and configuration: GPU 0: Tesla T4 Nvidia driver version: 520.61.05 cuDNN version: Probably one of the following: /usr/lib/x86_64-linux-gnu/libcudnn.so.8.7.0 /usr/lib/x86_64-linux-gnu/libcudnn_adv_infer.so.8.7.0 /usr/lib/x86_64-linux-gnu/libcudnn_adv_train.so.8.7.0 /usr/lib/x86_64-linux-gnu/libcudnn_cnn_infer.so.8.7.0 /usr/lib/x86_64-linux-gnu/libcudnn_cnn_train.so.8.7.0 /usr/lib/x86_64-linux-gnu/libcudnn_ops_infer.so.8.7.0 /usr/lib/x86_64-linux-gnu/libcudnn_ops_train.so.8.7.0 HIP runtime version: N/A MIOpen runtime version: N/A Is XNNPACK available: True

    Versions of relevant libraries: [pip3] mypy-extensions==0.4.3 [pip3] numpy==1.22.3 [pip3] torch==1.13.0 [pip3] torchaudio==0.13.0 [pip3] torchvision==0.14.0 [conda] blas 1.0 mkl
    [conda] cudatoolkit 11.6.0 hecad31d_10 conda-forge [conda] mkl 2021.4.0 h06a4308_640
    [conda] mkl-service 2.4.0 py39h7f8727e_0
    [conda] mkl_fft 1.3.1 py39hd3c417c_0
    [conda] mkl_random 1.2.2 py39h51133e4_0
    [conda] numpy 1.22.3 pypi_0 pypi [conda] pytorch-mutex 1.0 cuda pytorch [conda] torch 1.13.0 pypi_0 pypi [conda] torchaudio 0.13.0 pypi_0 pypi [conda] torchvision 0.14.0 pypi_0 pypi

    opened by alexkatovsky 0
  • Security policy impractical / lacks contact information?

    Security policy impractical / lacks contact information?

    📚 The doc issue

    Hi, happy new year! :tada:

    I have a potential security issue to report but https://github.com/pytorch/pytorch/security/policy does not answer the question where to send reports to but only links to a page Meta/Facebook(!) Bug Bounty Program Info with a wall of text and where it's not clear which parts applies to Meta/Facbook only and which to PyTorch. On a side note, I do not have a Facbook account. So this seems rather impractical, and I can now choose whether to (a) just report right to the public issue tracker or (b) not report at all. Please recondsider this approach, thank you! If you'd like to reach out off-GitHub, my profile has my e-mail address for contact.

    Best, Sebastian

    Suggest a potential alternative/fix

    No response

    opened by hartwork 0
  • v1.13.1(Dec 16, 2022)

    This release is meant to fix the following issues (regressions / silent correctness):

    • RuntimeError by torch.nn.modules.activation.MultiheadAttention with bias=False and batch_first=True #88669
    • Installation via pip on Amazon Linux 2, regression #88869
    • Installation using poetry on Mac M1, failure #88049
    • Missing masked tensor documentation #89734
    • torch.jit.annotations.parse_type_line is not safe (command injection) #88868
    • Use the Python frame safely in _pythonCallstack #88993
    • Double-backward with full_backward_hook causes RuntimeError #88312
    • Fix logical error in get_default_qat_qconfig #88876
    • Fix cuda/cpu check on NoneType and unit test #88854 and #88970
    • Onnx ATen Fallback for BUILD_CAFFE2=0 for ONNX-only ops #88504
    • Onnx operator_export_type on the new registry #87735
    • torchrun AttributeError caused by file_based_local_timer on Windows #85427

    The release tracker should contain all relevant pull requests related to this release as well as links to related issues

    Source code(tar.gz)
    Source code(zip)
    pytorch-v1.13.1.tar.gz(223.21 MB)
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