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v1.4.0+7d1d80773
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<p class="caption" role="heading"><span class="caption-text">Getting Started</span></p>
<ul class="current">
<li class="toctree-l1 current"><a class="current reference internal" href="#">Installation</a></li>
<li class="toctree-l1"><a class="reference internal" href="getting_started_with_python_api.html">Using Torch-TensorRT in Python</a></li>
<li class="toctree-l1"><a class="reference internal" href="getting_started_with_cpp_api.html">Using Torch-TensorRT in C++</a></li>
<li class="toctree-l1"><a class="reference internal" href="getting_started_with_windows.html">Building Torch-TensorRT on Windows</a></li>
<li class="toctree-l1"><a class="reference internal" href="getting_started_with_windows.html#building-with-visual-studio-code">Building With Visual Studio Code</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../tutorials/creating_torchscript_module_in_python.html">Creating a TorchScript Module</a></li>
<li class="toctree-l1"><a class="reference internal" href="../tutorials/creating_torchscript_module_in_python.html#working-with-torchscript-in-python">Working with TorchScript in Python</a></li>
<li class="toctree-l1"><a class="reference internal" href="../tutorials/creating_torchscript_module_in_python.html#saving-torchscript-module-to-disk">Saving TorchScript Module to Disk</a></li>
<li class="toctree-l1"><a class="reference internal" href="../tutorials/getting_started_with_fx_path.html">Torch-TensorRT (FX Frontend) User Guide</a></li>
<li class="toctree-l1"><a class="reference internal" href="../tutorials/ptq.html">Post Training Quantization (PTQ)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../tutorials/runtime.html">Deploying Torch-TensorRT Programs</a></li>
<li class="toctree-l1"><a class="reference internal" href="../tutorials/serving_torch_tensorrt_with_triton.html">Serving a Torch-TensorRT model with Triton</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../tutorials/notebooks.html">Example notebooks</a></li>
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<p class="caption" role="heading"><span class="caption-text">Python API Documenation</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../py_api/torch_tensorrt.html">torch_tensorrt</a></li>
<li class="toctree-l1"><a class="reference internal" href="../py_api/logging.html">torch_tensorrt.logging</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../py_api/fx.html">torch_tensorrt.fx</a></li>
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<p class="caption" role="heading"><span class="caption-text">C++ API Documenation</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../_cpp_api/torch_tensort_cpp.html">Torch-TensorRT C++ API</a></li>
<li class="toctree-l1"><a class="reference internal" href="../_cpp_api/namespace_torch_tensorrt.html">Namespace torch_tensorrt</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../_cpp_api/namespace_torch_tensorrt__torchscript.html">Namespace torch_tensorrt::torchscript</a></li>
<li class="toctree-l1"><a class="reference internal" href="../_cpp_api/namespace_torch_tensorrt__ptq.html">Namespace torch_tensorrt::ptq</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../contributors/writing_converters.html">Writing Converters</a></li>
<li class="toctree-l1"><a class="reference internal" href="../contributors/useful_links.html">Useful Links for Torch-TensorRT Development</a></li>
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<article itemprop="articleBody" id="pytorch-article" class="pytorch-article">
<section id="installation">
<span id="id1"></span><h1>Installation<a class="headerlink" href="#installation" title="Permalink to this headline">¶</a></h1>
<section id="precompiled-binaries">
<h2>Precompiled Binaries<a class="headerlink" href="#precompiled-binaries" title="Permalink to this headline">¶</a></h2>
<section id="dependencies">
<h3>Dependencies<a class="headerlink" href="#dependencies" title="Permalink to this headline">¶</a></h3>
<p>You need to have either PyTorch or LibTorch installed based on if you are using Python or C++
and you must have CUDA, cuDNN and TensorRT installed.</p>
<blockquote>
<div><ul class="simple">
<li><p><a class="reference external" href="https://www.pytorch.org">https://www.pytorch.org</a></p></li>
<li><p><a class="reference external" href="https://developer.nvidia.com/cuda">https://developer.nvidia.com/cuda</a></p></li>
<li><p><a class="reference external" href="https://developer.nvidia.com/cudnn">https://developer.nvidia.com/cudnn</a></p></li>
<li><p><a class="reference external" href="https://developer.nvidia.com/tensorrt">https://developer.nvidia.com/tensorrt</a></p></li>
</ul>
</div></blockquote>
</section>
<section id="python-package">
<h3>Python Package<a class="headerlink" href="#python-package" title="Permalink to this headline">¶</a></h3>
<p>You can install the python package using</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>pip3<span class="w"> </span>install<span class="w"> </span>nvidia-pyindex
pip3<span class="w"> </span>install<span class="w"> </span>nvidia-tensorrt
pip3<span class="w"> </span>install<span class="w"> </span>torch-tensorrt<span class="o">==</span><VERSION><span class="w"> </span>-f<span class="w"> </span>https://github.com/pytorch/TensorRT/releases/expanded_assets/<VERSION>
</pre></div>
</div>
</section>
<section id="c-binary-distribution">
<span id="bin-dist"></span><h3>C++ Binary Distribution<a class="headerlink" href="#c-binary-distribution" title="Permalink to this headline">¶</a></h3>
<p>Precompiled tarballs for releases are provided here: <a class="reference external" href="https://github.com/pytorch/TensorRT/releases">https://github.com/pytorch/TensorRT/releases</a></p>
</section>
</section>
<section id="compiling-from-source">
<span id="compile-from-source"></span><h2>Compiling From Source<a class="headerlink" href="#compiling-from-source" title="Permalink to this headline">¶</a></h2>
<section id="dependencies-for-compilation">
<span id="installing-deps"></span><h3>Dependencies for Compilation<a class="headerlink" href="#dependencies-for-compilation" title="Permalink to this headline">¶</a></h3>
<p>Torch-TensorRT is built with Bazel, so begin by installing it.</p>
<blockquote>
<div><ul class="simple">
<li><p>The easiest way is to install bazelisk using the method of your choosing <a class="reference external" href="https://github.com/bazelbuild/bazelisk">https://github.com/bazelbuild/bazelisk</a></p></li>
<li><p>Otherwise you can use the following instructions to install binaries <a class="reference external" href="https://docs.bazel.build/versions/master/install.html">https://docs.bazel.build/versions/master/install.html</a></p></li>
<li><p>Finally if you need to compile from source (e.g. aarch64 until bazel distributes binaries for the architecture) you can use these instructions</p></li>
</ul>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="nb">export</span><span class="w"> </span><span class="nv">BAZEL_VERSION</span><span class="o">=</span><span class="k">$(</span>cat<span class="w"> </span><PATH_TO_TORCHTRT_ROOT>/.bazelversion<span class="k">)</span>
mkdir<span class="w"> </span>bazel
<span class="nb">cd</span><span class="w"> </span>bazel
curl<span class="w"> </span>-fSsL<span class="w"> </span>-O<span class="w"> </span>https://github.com/bazelbuild/bazel/releases/download/<span class="nv">$BAZEL_VERSION</span>/bazel-<span class="nv">$BAZEL_VERSION</span>-dist.zip
unzip<span class="w"> </span>bazel-<span class="nv">$BAZEL_VERSION</span>-dist.zip
bash<span class="w"> </span>./compile.sh
cp<span class="w"> </span>output/bazel<span class="w"> </span>/usr/local/bin/
</pre></div>
</div>
</div></blockquote>
<p>You will also need to have CUDA installed on the system (or if running in a container, the system must have
the CUDA driver installed and the container must have CUDA)</p>
<p>The correct LibTorch version will be pulled down for you by bazel.</p>
<blockquote>
<div><p>NOTE: For best compatability with official PyTorch, use torch==1.10.0+cuda113, TensorRT 8.0 and cuDNN 8.2 for CUDA 11.3 however Torch-TensorRT itself supports
TensorRT and cuDNN for other CUDA versions for usecases such as using NVIDIA compiled distributions of PyTorch that use other versions of CUDA
e.g. aarch64 or custom compiled version of PyTorch.</p>
</div></blockquote>
<section id="choosing-the-right-abi">
<span id="abis"></span><h4>Choosing the Right ABI<a class="headerlink" href="#choosing-the-right-abi" title="Permalink to this headline">¶</a></h4>
<p>Likely the most complicated thing about compiling Torch-TensorRT is selecting the correct ABI. There are two options
which are incompatible with each other, pre-cxx11-abi and the cxx11-abi. The complexity comes from the fact that while
the most popular distribution of PyTorch (wheels downloaded from pytorch.org/pypi directly) use the pre-cxx11-abi, most
other distributions you might encounter (e.g. ones from NVIDIA - NGC containers, and builds for Jetson as well as certain
libtorch builds and likely if you build PyTorch from source) use the cxx11-abi. It is important you compile Torch-TensorRT
using the correct ABI to function properly. Below is a table with general pairings of PyTorch distribution sources and the
recommended commands:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 33%" />
<col style="width: 31%" />
<col style="width: 36%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>PyTorch Source</p></th>
<th class="head"><p>Recommended C++ Compilation Command</p></th>
<th class="head"><p>Recommended Python Compilation Command</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>PyTorch whl file from PyTorch.org</p></td>
<td><p>bazel build //:libtorchtrt -c opt –config pre_cxx11_abi</p></td>
<td><p>python3 setup.py bdist_wheel</p></td>
</tr>
<tr class="row-odd"><td><p>libtorch-shared-with-deps-<a href="#id2"><span class="problematic" id="id3">*</span></a>.zip from PyTorch.org</p></td>
<td><p>bazel build //:libtorchtrt -c opt –config pre_cxx11_abi</p></td>
<td><p>python3 setup.py bdist_wheel</p></td>
</tr>
<tr class="row-even"><td><p>libtorch-cxx11-abi-shared-with-deps-<a href="#id4"><span class="problematic" id="id5">*</span></a>.zip from PyTorch.org</p></td>
<td><p>bazel build //:libtorchtrt -c opt</p></td>
<td><p>python3 setup.py bdist_wheel –use-cxx11-abi</p></td>
</tr>
<tr class="row-odd"><td><p>PyTorch preinstalled in an NGC container</p></td>
<td><p>bazel build //:libtorchtrt -c opt</p></td>
<td><p>python3 setup.py bdist_wheel –use-cxx11-abi</p></td>
</tr>
<tr class="row-even"><td><p>PyTorch from the NVIDIA Forums for Jetson</p></td>
<td><p>bazel build //:libtorchtrt -c opt</p></td>
<td><p>python3 setup.py bdist_wheel –jetpack-version 4.6 –use-cxx11-abi</p></td>
</tr>
<tr class="row-odd"><td><p>PyTorch built from Source</p></td>
<td><p>bazel build //:libtorchtrt -c opt</p></td>
<td><p>python3 setup.py bdist_wheel –use-cxx11-abi</p></td>
</tr>
</tbody>
</table>
<blockquote>
<div><p>NOTE: For all of the above cases you must correctly declare the source of PyTorch you intend to use in your WORKSPACE file for both Python and C++ builds. See below for more information</p>
</div></blockquote>
<p>You then have two compilation options:</p>
</section>
</section>
<section id="building-using-cudnn-tensorrt-tarball-distributions">
<span id="build-from-archive"></span><h3><strong>Building using cuDNN & TensorRT tarball distributions</strong><a class="headerlink" href="#building-using-cudnn-tensorrt-tarball-distributions" title="Permalink to this headline">¶</a></h3>
<blockquote>
<div><p>This is recommended so as to build Torch-TensorRT hermetically and insures any compilation errors are not caused by version issues</p>
<p>Make sure when running Torch-TensorRT that these versions of the libraries are prioritized in your <code class="docutils literal notranslate"><span class="pre">$LD_LIBRARY_PATH</span></code></p>
</div></blockquote>
<dl class="simple">
<dt>You need to download the tarball distributions of TensorRT and cuDNN from the NVIDIA website.</dt><dd><ul class="simple">
<li><p><a class="reference external" href="https://developer.nvidia.com/cudnn">https://developer.nvidia.com/cudnn</a></p></li>
<li><p><a class="reference external" href="https://developer.nvidia.com/tensorrt">https://developer.nvidia.com/tensorrt</a></p></li>
</ul>
</dd>
</dl>
<p>Place these files in a directory (the directories <code class="docutils literal notranslate"><span class="pre">third_party/distdir/[x86_64-linux-gnu</span> <span class="pre">|</span> <span class="pre">aarch64-linux-gnu]</span></code> exist for this purpose)</p>
<p>Then compile referencing the directory with the tarballs</p>
<blockquote>
<div><p>If you get errors regarding the packages, check their sha256 hashes and make sure they match the ones listed in <code class="docutils literal notranslate"><span class="pre">WORKSPACE</span></code></p>
</div></blockquote>
<section id="release-build">
<h4>Release Build<a class="headerlink" href="#release-build" title="Permalink to this headline">¶</a></h4>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>bazel<span class="w"> </span>build<span class="w"> </span>//:libtorchtrt<span class="w"> </span>-c<span class="w"> </span>opt<span class="w"> </span>--distdir<span class="w"> </span>third_party/distdir/<span class="o">[</span>x86_64-linux-gnu<span class="w"> </span><span class="p">|</span><span class="w"> </span>aarch64-linux-gnu<span class="o">]</span>
</pre></div>
</div>
<p>A tarball with the include files and library can then be found in <code class="docutils literal notranslate"><span class="pre">bazel-bin</span></code></p>
</section>
<section id="debug-build">
<span id="build-from-archive-debug"></span><h4>Debug Build<a class="headerlink" href="#debug-build" title="Permalink to this headline">¶</a></h4>
<p>To build with debug symbols use the following command</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>bazel<span class="w"> </span>build<span class="w"> </span>//:libtorchtrt<span class="w"> </span>-c<span class="w"> </span>dbg<span class="w"> </span>--distdir<span class="w"> </span>third_party/distdir/<span class="o">[</span>x86_64-linux-gnu<span class="w"> </span><span class="p">|</span><span class="w"> </span>aarch64-linux-gnu<span class="o">]</span>
</pre></div>
</div>
<p>A tarball with the include files and library can then be found in <code class="docutils literal notranslate"><span class="pre">bazel-bin</span></code></p>
</section>
<section id="pre-cxx11-abi-build">
<h4>Pre CXX11 ABI Build<a class="headerlink" href="#pre-cxx11-abi-build" title="Permalink to this headline">¶</a></h4>
<p>To build using the pre-CXX11 ABI use the <code class="docutils literal notranslate"><span class="pre">pre_cxx11_abi</span></code> config</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>bazel<span class="w"> </span>build<span class="w"> </span>//:libtorchtrt<span class="w"> </span>--config<span class="w"> </span>pre_cxx11_abi<span class="w"> </span>-c<span class="w"> </span><span class="o">[</span>dbg/opt<span class="o">]</span><span class="w"> </span>--distdir<span class="w"> </span>third_party/distdir/<span class="o">[</span>x86_64-linux-gnu<span class="w"> </span><span class="p">|</span><span class="w"> </span>aarch64-linux-gnu<span class="o">]</span>
</pre></div>
</div>
<p>A tarball with the include files and library can then be found in <code class="docutils literal notranslate"><span class="pre">bazel-bin</span></code></p>
</section>
</section>
<section id="building-using-locally-installed-cudnn-tensorrt">
<span id="build-from-local"></span><h3><strong>Building using locally installed cuDNN & TensorRT</strong><a class="headerlink" href="#building-using-locally-installed-cudnn-tensorrt" title="Permalink to this headline">¶</a></h3>
<blockquote>
<div><p>If you encounter bugs and you compiled using this method please disclose that you used local sources in the issue (an ldd dump would be nice too)</p>
</div></blockquote>
<p>Install TensorRT, CUDA and cuDNN on the system before starting to compile.</p>
<p>In WORKSPACE comment out:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># Downloaded distributions to use with --distdir</span>
<span class="n">http_archive</span><span class="p">(</span>
<span class="n">name</span><span class="o">=</span><span class="s2">"cudnn"</span><span class="p">,</span>
<span class="n">urls</span><span class="o">=</span><span class="p">[</span>
<span class="s2">"<URL>"</span><span class="p">,</span>
<span class="p">],</span>
<span class="n">build_file</span><span class="o">=</span><span class="s2">"@//third_party/cudnn/archive:BUILD"</span><span class="p">,</span>
<span class="n">sha256</span><span class="o">=</span><span class="s2">"<TAR SHA256>"</span><span class="p">,</span>
<span class="n">strip_prefix</span><span class="o">=</span><span class="s2">"cuda"</span><span class="p">,</span>
<span class="p">)</span>
<span class="n">http_archive</span><span class="p">(</span>
<span class="n">name</span><span class="o">=</span><span class="s2">"tensorrt"</span><span class="p">,</span>
<span class="n">urls</span><span class="o">=</span><span class="p">[</span>
<span class="s2">"<URL>"</span><span class="p">,</span>
<span class="p">],</span>
<span class="n">build_file</span><span class="o">=</span><span class="s2">"@//third_party/tensorrt/archive:BUILD"</span><span class="p">,</span>
<span class="n">sha256</span><span class="o">=</span><span class="s2">"<TAR SHA256>"</span><span class="p">,</span>
<span class="n">strip_prefix</span><span class="o">=</span><span class="s2">"TensorRT-<VERSION>"</span><span class="p">,</span>
<span class="p">)</span>
</pre></div>
</div>
<p>and uncomment</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># Locally installed dependencies</span>
<span class="n">new_local_repository</span><span class="p">(</span>
<span class="n">name</span><span class="o">=</span><span class="s2">"cudnn"</span><span class="p">,</span> <span class="n">path</span><span class="o">=</span><span class="s2">"/usr/"</span><span class="p">,</span> <span class="n">build_file</span><span class="o">=</span><span class="s2">"@//third_party/cudnn/local:BUILD"</span>
<span class="p">)</span>
<span class="n">new_local_repository</span><span class="p">(</span>
<span class="n">name</span><span class="o">=</span><span class="s2">"tensorrt"</span><span class="p">,</span> <span class="n">path</span><span class="o">=</span><span class="s2">"/usr/"</span><span class="p">,</span> <span class="n">build_file</span><span class="o">=</span><span class="s2">"@//third_party/tensorrt/local:BUILD"</span>
<span class="p">)</span>
</pre></div>
</div>
<section id="id6">
<h4>Release Build<a class="headerlink" href="#id6" title="Permalink to this headline">¶</a></h4>
<p>Compile using:</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>bazel<span class="w"> </span>build<span class="w"> </span>//:libtorchtrt<span class="w"> </span>-c<span class="w"> </span>opt
</pre></div>
</div>
<p>A tarball with the include files and library can then be found in <code class="docutils literal notranslate"><span class="pre">bazel-bin</span></code></p>
</section>
<section id="build-from-local-debug">
<span id="id7"></span><h4>Debug Build<a class="headerlink" href="#build-from-local-debug" title="Permalink to this headline">¶</a></h4>
<p>To build with debug symbols use the following command</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>bazel<span class="w"> </span>build<span class="w"> </span>//:libtorchtrt<span class="w"> </span>-c<span class="w"> </span>dbg
</pre></div>
</div>
<p>A tarball with the include files and library can then be found in <code class="docutils literal notranslate"><span class="pre">bazel-bin</span></code></p>
</section>
<section id="id8">
<h4>Pre CXX11 ABI Build<a class="headerlink" href="#id8" title="Permalink to this headline">¶</a></h4>
<p>To build using the pre-CXX11 ABI use the <code class="docutils literal notranslate"><span class="pre">pre_cxx11_abi</span></code> config</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>bazel<span class="w"> </span>build<span class="w"> </span>//:libtorchtrt<span class="w"> </span>--config<span class="w"> </span>pre_cxx11_abi<span class="w"> </span>-c<span class="w"> </span><span class="o">[</span>dbg/opt<span class="o">]</span>
</pre></div>
</div>
</section>
</section>
<section id="building-with-cmake">
<h3><strong>Building with CMake</strong><a class="headerlink" href="#building-with-cmake" title="Permalink to this headline">¶</a></h3>
<p>It is possible to build the API libraries (in cpp/) and the torchtrtc executable using CMake instead of Bazel.
Currently, the python API and the tests cannot be built with CMake.
Begin by installing CMake.</p>
<blockquote>
<div><ul class="simple">
<li><p>Latest releases of CMake and instructions on how to install are available for different platforms
[on their website](<a class="reference external" href="https://cmake.org/download/">https://cmake.org/download/</a>).</p></li>
</ul>
</div></blockquote>
<p>A few useful CMake options include:</p>
<blockquote>
<div><ul class="simple">
<li><p>CMake finders for TensorRT and cuDNN are provided in <cite>cmake/Modules</cite>. In order for CMake to use them, pass
<cite>-DCMAKE_MODULE_PATH=cmake/Modules</cite> when configuring the project with CMake.</p></li>
<li><p>Libtorch provides its own CMake finder. In case CMake doesn’t find it, pass the path to your install of
libtorch with <cite>-DTorch_DIR=<path to libtorch>/share/cmake/Torch</cite></p></li>
<li><p>If TensorRT is not found with the provided cmake finder, specify <cite>-DTensorRT_ROOT=<path to TensorRT></cite></p></li>
<li><p>Finally, configure and build the project in a build directory of your choice with the following command
from the root of Torch-TensorRT project:</p></li>
</ul>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>cmake<span class="w"> </span>-S.<span class="w"> </span>-B<build<span class="w"> </span>directory><span class="w"> </span><span class="se">\</span>
<span class="w"> </span><span class="o">[</span>-DCMAKE_MODULE_PATH<span class="o">=</span>cmake/Module<span class="o">]</span><span class="w"> </span><span class="se">\</span>
<span class="w"> </span><span class="o">[</span>-DTorch_DIR<span class="o">=</span><path<span class="w"> </span>to<span class="w"> </span>libtorch>/share/cmake/Torch<span class="o">]</span><span class="w"> </span><span class="se">\</span>
<span class="w"> </span><span class="o">[</span>-DTensorRT_ROOT<span class="o">=</span><path<span class="w"> </span>to<span class="w"> </span>TensorRT><span class="o">]</span><span class="w"> </span><span class="se">\</span>
<span class="w"> </span><span class="o">[</span>-DCMAKE_BUILD_TYPE<span class="o">=</span>Debug<span class="p">|</span>Release<span class="o">]</span>
cmake<span class="w"> </span>--build<span class="w"> </span><build<span class="w"> </span>directory>
</pre></div>
</div>
</div></blockquote>
</section>
<section id="building-the-python-package">
<h3><strong>Building the Python package</strong><a class="headerlink" href="#building-the-python-package" title="Permalink to this headline">¶</a></h3>
<p>Begin by installing <code class="docutils literal notranslate"><span class="pre">ninja</span></code></p>
<p>You can build the Python package using <code class="docutils literal notranslate"><span class="pre">setup.py</span></code> (this will also build the correct version of <code class="docutils literal notranslate"><span class="pre">libtorchtrt.so</span></code>)</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>python3<span class="w"> </span>setup.py<span class="w"> </span><span class="o">[</span>install/bdist_wheel<span class="o">]</span>
</pre></div>
</div>
<section id="id9">
<h4>Debug Build<a class="headerlink" href="#id9" title="Permalink to this headline">¶</a></h4>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>python3<span class="w"> </span>setup.py<span class="w"> </span>develop<span class="w"> </span><span class="o">[</span>--user<span class="o">]</span>
</pre></div>
</div>
<p>This also compiles a debug build of <code class="docutils literal notranslate"><span class="pre">libtorchtrt.so</span></code></p>
</section>
</section>
<section id="building-natively-on-aarch64-jetson">
<h3><strong>Building Natively on aarch64 (Jetson)</strong><a class="headerlink" href="#building-natively-on-aarch64-jetson" title="Permalink to this headline">¶</a></h3>
<section id="prerequisites">
<h4>Prerequisites<a class="headerlink" href="#prerequisites" title="Permalink to this headline">¶</a></h4>
<p>Install or compile a build of PyTorch/LibTorch for aarch64</p>
<p>NVIDIA hosts builds the latest release branch for Jetson here:</p>
<blockquote>
<div><p><a class="reference external" href="https://forums.developer.nvidia.com/t/pytorch-for-jetson-version-1-10-now-available/72048">https://forums.developer.nvidia.com/t/pytorch-for-jetson-version-1-10-now-available/72048</a></p>
</div></blockquote>
</section>
<section id="enviorment-setup">
<h4>Enviorment Setup<a class="headerlink" href="#enviorment-setup" title="Permalink to this headline">¶</a></h4>
<p>To build natively on aarch64-linux-gnu platform, configure the <code class="docutils literal notranslate"><span class="pre">WORKSPACE</span></code> with local available dependencies.</p>
<ol class="arabic">
<li><p>Replace <code class="docutils literal notranslate"><span class="pre">WORKSPACE</span></code> with the corresponding WORKSPACE file in <code class="docutils literal notranslate"><span class="pre">//toolchains/jp_workspaces</span></code></p></li>
<li><p>Configure the correct paths to directory roots containing local dependencies in the <code class="docutils literal notranslate"><span class="pre">new_local_repository</span></code> rules:</p>
<blockquote>
<div><p>NOTE: If you installed PyTorch using a pip package, the correct path is the path to the root of the python torch package.
In the case that you installed with <code class="docutils literal notranslate"><span class="pre">sudo</span> <span class="pre">pip</span> <span class="pre">install</span></code> this will be <code class="docutils literal notranslate"><span class="pre">/usr/local/lib/python3.8/dist-packages/torch</span></code>.
In the case you installed with <code class="docutils literal notranslate"><span class="pre">pip</span> <span class="pre">install</span> <span class="pre">--user</span></code> this will be <code class="docutils literal notranslate"><span class="pre">$HOME/.local/lib/python3.8/site-packages/torch</span></code>.</p>
</div></blockquote>
</li>
</ol>
<p>In the case you are using NVIDIA compiled pip packages, set the path for both libtorch sources to the same path. This is because unlike
PyTorch on x86_64, NVIDIA aarch64 PyTorch uses the CXX11-ABI. If you compiled for source using the pre_cxx11_abi and only would like to
use that library, set the paths to the same path but when you compile make sure to add the flag <code class="docutils literal notranslate"><span class="pre">--config=pre_cxx11_abi</span></code></p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>new_local_repository<span class="o">(</span>
<span class="w"> </span><span class="nv">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"libtorch"</span>,
<span class="w"> </span><span class="nv">path</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"/usr/local/lib/python3.8/dist-packages/torch"</span>,
<span class="w"> </span><span class="nv">build_file</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"third_party/libtorch/BUILD"</span>
<span class="o">)</span>
new_local_repository<span class="o">(</span>
<span class="w"> </span><span class="nv">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"libtorch_pre_cxx11_abi"</span>,
<span class="w"> </span><span class="nv">path</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"/usr/local/lib/python3.8/dist-packages/torch"</span>,
<span class="w"> </span><span class="nv">build_file</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"third_party/libtorch/BUILD"</span>
<span class="o">)</span>
</pre></div>
</div>
</section>
<section id="compile-c-library-and-compiler-cli">
<h4>Compile C++ Library and Compiler CLI<a class="headerlink" href="#compile-c-library-and-compiler-cli" title="Permalink to this headline">¶</a></h4>
<blockquote>
<div><p>NOTE: Due to shifting dependency locations between Jetpack 4.5 and 4.6 there is a now a flag to inform bazel of the Jetpack version</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>--platforms<span class="w"> </span>//toolchains:jetpack_x.x
</pre></div>
</div>
</div></blockquote>
<p>Compile Torch-TensorRT library using bazel command:</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>bazel<span class="w"> </span>build<span class="w"> </span>//:libtorchtrt<span class="w"> </span>--platforms<span class="w"> </span>//toolchains:jetpack_5.0
</pre></div>
</div>
</section>
<section id="compile-python-api">
<h4>Compile Python API<a class="headerlink" href="#compile-python-api" title="Permalink to this headline">¶</a></h4>
<blockquote>
<div><p>NOTE: Due to shifting dependencies locations between Jetpack 4.5 and newer Jetpack verisons there is now a flag for <code class="docutils literal notranslate"><span class="pre">setup.py</span></code> which sets the jetpack version (default: 5.0)</p>
</div></blockquote>
<p>Compile the Python API using the following command from the <code class="docutils literal notranslate"><span class="pre">//py</span></code> directory:</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>python3<span class="w"> </span>setup.py<span class="w"> </span>install<span class="w"> </span>--use-cxx11-abi
</pre></div>
</div>
<p>If you have a build of PyTorch that uses Pre-CXX11 ABI drop the <code class="docutils literal notranslate"><span class="pre">--use-cxx11-abi</span></code> flag</p>
<p>If you are building for Jetpack 4.5 add the <code class="docutils literal notranslate"><span class="pre">--jetpack-version</span> <span class="pre">5.0</span></code> flag</p>
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