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TRTorch Getting Started - LeNet
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PyTorch model
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TorchScript traced model
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<p>
<img alt="5b0be119fb6740deb264c806a25f167d" src="http://developer.download.nvidia.com/compute/machine-learning/frameworks/nvidia_logo.png"/>
</p>
<h1 id="notebooks-lenet-getting-started--page-root">
TRTorch Getting Started - LeNet
<a class="headerlink" href="#notebooks-lenet-getting-started--page-root" title="Permalink to this headline">
¶
</a>
</h1>
<h2 id="Overview">
Overview
<a class="headerlink" href="#Overview" title="Permalink to this headline">
¶
</a>
</h2>
<p>
In the practice of developing machine learning models, there are few tools as approachable as PyTorch for developing and experimenting in designing machine learning models. The power of PyTorch comes from its deep integration into Python, its flexibility and its approach to automatic differentiation and execution (eager execution). However, when moving from research into production, the requirements change and we may no longer want that deep Python integration and we want optimization to get the
best performance we can on our deployment platform. In PyTorch 1.0, TorchScript was introduced as a method to separate your PyTorch model from Python, make it portable and optimizable. TorchScript uses PyTorch’s JIT compiler to transform your normal PyTorch code which gets interpreted by the Python interpreter to an intermediate representation (IR) which can have optimizations run on it and at runtime can get interpreted by the PyTorch JIT interpreter. For PyTorch this has opened up a whole new
world of possibilities, including deployment in other languages like C++. It also introduces a structured graph based format that we can use to do down to the kernel level optimization of models for inference.
</p>
<p>
When deploying on NVIDIA GPUs TensorRT, NVIDIA’s Deep Learning Optimization SDK and Runtime is able to take models from any major framework and specifically tune them to perform better on specific target hardware in the NVIDIA family be it an A100, TITAN V, Jetson Xavier or NVIDIA’s Deep Learning Accelerator. TensorRT performs a couple sets of optimizations to achieve this. TensorRT fuses layers and tensors in the model graph, it then uses a large kernel library to select implementations that
perform best on the target GPU. TensorRT also has strong support for reduced operating precision execution which allows users to leverage the Tensor Cores on Volta and newer GPUs as well as reducing memory and computation footprints on device.
</p>
<p>
TRTorch is a compiler that uses TensorRT to optimize TorchScript code, compiling standard TorchScript modules into ones that internally run with TensorRT optimizations. This enables you to continue to remain in the PyTorch ecosystem, using all the great features PyTorch has such as module composability, its flexible tensor implementation, data loaders and more. TRTorch is available to use with both PyTorch and LibTorch.
</p>
<h3 id="Learning-objectives">
Learning objectives
<a class="headerlink" href="#Learning-objectives" title="Permalink to this headline">
¶
</a>
</h3>
<p>
This notebook demonstrates the steps for compiling a TorchScript module with TRTorch on a simple LeNet network.
</p>
<h2 id="Content">
Content
<a class="headerlink" href="#Content" title="Permalink to this headline">
¶
</a>
</h2>
<ol class="arabic simple">
<li>
<p>
<a class="reference external" href="#1">
Requirements
</a>
</p>
</li>
<li>
<p>
<a class="reference external" href="#2">
Creating TorchScript modules
</a>
</p>
</li>
<li>
<p>
<a class="reference external" href="#3">
Compiling with TRTorch
</a>
</p>
</li>
</ol>
<p>
## 1. Requirements
</p>
<p>
Follow the steps in
<code class="docutils literal notranslate">
<span class="pre">
notebooks/README
</span>
</code>
to prepare a Docker container, within which you can run this notebook.
</p>
<p>
## 2. Creating TorchScript modules
</p>
<p>
Here we create two submodules for a feature extractor and a classifier and stitch them together in a single LeNet module. In this case this is overkill but modules give us granular control over our program including where we decide to optimize and where we don’t. It is also the unit that the TorchScript compiler operates on. So you can decide to only convert/optimize the feature extractor and leave the classifier in standard PyTorch or you can convert the whole thing. When compiling your module
to TorchScript, there are two paths: Tracing and Scripting.
</p>
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<span></span><span class="kn">import</span> <span class="nn">torch</span>
<span class="kn">from</span> <span class="nn">torch</span> <span class="kn">import</span> <span class="n">nn</span>
<span class="kn">import</span> <span class="nn">torch.nn.functional</span> <span class="k">as</span> <span class="nn">F</span>
<span class="k">class</span> <span class="nc">LeNetFeatExtractor</span><span class="p">(</span><span class="n">nn</span><span class="o">.</span><span class="n">Module</span><span class="p">):</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">LeNetFeatExtractor</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">conv1</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Conv2d</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">conv2</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Conv2d</span><span class="p">(</span><span class="mi">6</span><span class="p">,</span> <span class="mi">16</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">):</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">F</span><span class="o">.</span><span class="n">max_pool2d</span><span class="p">(</span><span class="n">F</span><span class="o">.</span><span class="n">relu</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">conv1</span><span class="p">(</span><span class="n">x</span><span class="p">)),</span> <span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">F</span><span class="o">.</span><span class="n">max_pool2d</span><span class="p">(</span><span class="n">F</span><span class="o">.</span><span class="n">relu</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">conv2</span><span class="p">(</span><span class="n">x</span><span class="p">)),</span> <span class="mi">2</span><span class="p">)</span>
<span class="k">return</span> <span class="n">x</span>
<span class="k">class</span> <span class="nc">LeNetClassifier</span><span class="p">(</span><span class="n">nn</span><span class="o">.</span><span class="n">Module</span><span class="p">):</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">LeNetClassifier</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fc1</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Linear</span><span class="p">(</span><span class="mi">16</span> <span class="o">*</span> <span class="mi">6</span> <span class="o">*</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">120</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fc2</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Linear</span><span class="p">(</span><span class="mi">120</span><span class="p">,</span> <span class="mi">84</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fc3</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Linear</span><span class="p">(</span><span class="mi">84</span><span class="p">,</span> <span class="mi">10</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">):</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">flatten</span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="mi">1</span><span class="p">)</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">F</span><span class="o">.</span><span class="n">relu</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">fc1</span><span class="p">(</span><span class="n">x</span><span class="p">))</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">F</span><span class="o">.</span><span class="n">relu</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">fc2</span><span class="p">(</span><span class="n">x</span><span class="p">))</span>
<span class="n">x</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">fc3</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
<span class="k">return</span> <span class="n">x</span>
<span class="k">class</span> <span class="nc">LeNet</span><span class="p">(</span><span class="n">nn</span><span class="o">.</span><span class="n">Module</span><span class="p">):</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">LeNet</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">feat</span> <span class="o">=</span> <span class="n">LeNetFeatExtractor</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">classifer</span> <span class="o">=</span> <span class="n">LeNetClassifier</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">):</span>
<span class="n">x</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">feat</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
<span class="n">x</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">classifer</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
<span class="k">return</span> <span class="n">x</span>
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<p>
Let us define a helper function to benchmark a model.
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<span></span><span class="kn">import</span> <span class="nn">time</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="kn">import</span> <span class="nn">torch.backends.cudnn</span> <span class="k">as</span> <span class="nn">cudnn</span>
<span class="n">cudnn</span><span class="o">.</span><span class="n">benchmark</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">def</span> <span class="nf">benchmark</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">input_shape</span><span class="o">=</span><span class="p">(</span><span class="mi">1024</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">32</span><span class="p">),</span> <span class="n">dtype</span><span class="o">=</span><span class="s1">'fp32'</span><span class="p">,</span> <span class="n">nwarmup</span><span class="o">=</span><span class="mi">50</span><span class="p">,</span> <span class="n">nruns</span><span class="o">=</span><span class="mi">10000</span><span class="p">):</span>
<span class="n">input_data</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">randn</span><span class="p">(</span><span class="n">input_shape</span><span class="p">)</span>
<span class="n">input_data</span> <span class="o">=</span> <span class="n">input_data</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="s2">"cuda"</span><span class="p">)</span>
<span class="k">if</span> <span class="n">dtype</span><span class="o">==</span><span class="s1">'fp16'</span><span class="p">:</span>
<span class="n">input_data</span> <span class="o">=</span> <span class="n">input_data</span><span class="o">.</span><span class="n">half</span><span class="p">()</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Warm up ..."</span><span class="p">)</span>
<span class="k">with</span> <span class="n">torch</span><span class="o">.</span><span class="n">no_grad</span><span class="p">():</span>
<span class="k">for</span> <span class="n">_</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">nwarmup</span><span class="p">):</span>
<span class="n">features</span> <span class="o">=</span> <span class="n">model</span><span class="p">(</span><span class="n">input_data</span><span class="p">)</span>
<span class="n">torch</span><span class="o">.</span><span class="n">cuda</span><span class="o">.</span><span class="n">synchronize</span><span class="p">()</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Start timing ..."</span><span class="p">)</span>
<span class="n">timings</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">with</span> <span class="n">torch</span><span class="o">.</span><span class="n">no_grad</span><span class="p">():</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">nruns</span><span class="o">+</span><span class="mi">1</span><span class="p">):</span>
<span class="n">start_time</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span>
<span class="n">features</span> <span class="o">=</span> <span class="n">model</span><span class="p">(</span><span class="n">input_data</span><span class="p">)</span>
<span class="n">torch</span><span class="o">.</span><span class="n">cuda</span><span class="o">.</span><span class="n">synchronize</span><span class="p">()</span>
<span class="n">end_time</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span>
<span class="n">timings</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">end_time</span> <span class="o">-</span> <span class="n">start_time</span><span class="p">)</span>
<span class="k">if</span> <span class="n">i</span><span class="o">%</span><span class="k">1000</span>==0:
<span class="nb">print</span><span class="p">(</span><span class="s1">'Iteration </span><span class="si">%d</span><span class="s1">/</span><span class="si">%d</span><span class="s1">, ave batch time </span><span class="si">%.2f</span><span class="s1"> ms'</span><span class="o">%</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">nruns</span><span class="p">,</span> <span class="n">np</span><span class="o">.</span><span class="n">mean</span><span class="p">(</span><span class="n">timings</span><span class="p">)</span><span class="o">*</span><span class="mi">1000</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Input shape:"</span><span class="p">,</span> <span class="n">input_data</span><span class="o">.</span><span class="n">size</span><span class="p">())</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Output features size:"</span><span class="p">,</span> <span class="n">features</span><span class="o">.</span><span class="n">size</span><span class="p">())</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">'Average batch time: </span><span class="si">%.2f</span><span class="s1"> ms'</span><span class="o">%</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">mean</span><span class="p">(</span><span class="n">timings</span><span class="p">)</span><span class="o">*</span><span class="mi">1000</span><span class="p">))</span>
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<h3 id="PyTorch-model">
PyTorch model
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¶
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<span></span><span class="n">model</span> <span class="o">=</span> <span class="n">LeNet</span><span class="p">()</span>
<span class="n">model</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="s2">"cuda"</span><span class="p">)</span><span class="o">.</span><span class="n">eval</span><span class="p">()</span>
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