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<div class="section" id="torch-utils-mobile-optimizer">
<h1>torch.utils.mobile_optimizer<a class="headerlink" href="#torch-utils-mobile-optimizer" title="Permalink to this headline">¶</a></h1>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This API is in beta and may change in the near future.</p>
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<p>Torch mobile supports <code class="docutils literal notranslate"><span class="pre">torch.mobile_optimizer.optimize_for_mobile</span></code> utility to run a list of optimization pass with modules in eval mode.
The method takes the following parameters: a torch.jit.ScriptModule object, a blacklisting optimization set and a preserved method list</p>
<dl class="simple">
<dt>By default, if optimization blacklist is None or empty, <code class="docutils literal notranslate"><span class="pre">optimize_for_mobile</span></code> will run the following optimizations:</dt><dd><ul class="simple">
<li><p><strong>Conv2D + BatchNorm fusion</strong> (blacklisting option <cite>MobileOptimizerType::CONV_BN_FUSION</cite>): This optimization pass folds <code class="docutils literal notranslate"><span class="pre">Conv2d-BatchNorm2d</span></code> into <code class="docutils literal notranslate"><span class="pre">Conv2d</span></code> in <code class="docutils literal notranslate"><span class="pre">forward</span></code> method of this module and all its submodules. The weight and bias of the <code class="docutils literal notranslate"><span class="pre">Conv2d</span></code> are correspondingly updated.</p></li>
<li><p><strong>Insert and Fold prepacked ops</strong> (blacklisting option <cite>MobileOptimizerType::INSERT_FOLD_PREPACK_OPS</cite>): This optimization pass rewrites the graph to replace 2D convolutions and linear ops with their prepacked counterparts. Prepacked ops are stateful ops in that, they require some state to be created, such as weight prepacking and use this state, i.e. prepacked weights, during op execution. XNNPACK is one such backend that provides prepacked ops, with kernels optimized for mobile platforms (such as ARM CPUs). Prepacking of weight enables efficient memory access and thus faster kernel execution. At the moment <code class="docutils literal notranslate"><span class="pre">optimize_for_mobile</span></code> pass rewrites the graph to replace <code class="docutils literal notranslate"><span class="pre">Conv2D/Linear</span></code> with 1) op that pre-packs weight for XNNPACK conv2d/linear ops and 2) op that takes pre-packed weight and activation as input and generates output activations. Since 1 needs to be done only once, we fold the weight pre-packing such that it is done only once at model load time. This pass of the <code class="docutils literal notranslate"><span class="pre">optimize_for_mobile</span></code> does 1 and 2 and then folds, i.e. removes, weight pre-packing ops.</p></li>
<li><p><strong>ReLU/Hardtanh fusion</strong>: XNNPACK ops support fusion of clamping. That is clamping of output activation is done as part of the kernel, including for 2D convolution and linear op kernels. Thus clamping effectively comes for free. Thus any op that can be expressed as clamping op, such as <code class="docutils literal notranslate"><span class="pre">ReLU</span></code> or <code class="docutils literal notranslate"><span class="pre">hardtanh</span></code>, can be fused with previous <code class="docutils literal notranslate"><span class="pre">Conv2D</span></code> or <code class="docutils literal notranslate"><span class="pre">linear</span></code> op in XNNPACK. This pass rewrites graph by finding <code class="docutils literal notranslate"><span class="pre">ReLU/hardtanh</span></code> ops that follow XNNPACK <code class="docutils literal notranslate"><span class="pre">Conv2D/linear</span></code> ops, written by the previous pass, and fuses them together.</p></li>
<li><p><strong>Dropout removal</strong> (blacklisting option <cite>MobileOptimizerType::REMOVE_DROPOUT</cite>): This optimization pass removes <code class="docutils literal notranslate"><span class="pre">dropout</span></code> and <code class="docutils literal notranslate"><span class="pre">dropout_</span></code> nodes from this module when training is false.</p></li>
</ul>
</dd>
</dl>
<p><code class="docutils literal notranslate"><span class="pre">optimize_for_mobile</span></code> will also invoke freeze_module pass which only preserves <code class="docutils literal notranslate"><span class="pre">forward</span></code> method.</p>
<dl class="function">
<dt id="torch.utils.mobile_optimizer.optimize_for_mobile">
<code class="sig-prename descclassname">torch.utils.mobile_optimizer.</code><code class="sig-name descname">optimize_for_mobile</code><span class="sig-paren">(</span><em class="sig-param">script_module</em>, <em class="sig-param">optimization_blacklist: Set[torch._C.MobileOptimizerType] = None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/utils/mobile_optimizer.html#optimize_for_mobile"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.utils.mobile_optimizer.optimize_for_mobile" title="Permalink to this definition">¶</a></dt>
<dd><dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>script_module</strong> – An instance of torch script module with type of ScriptModule.</p></li>
<li><p><strong>optimization_blacklist</strong> – A set with type of MobileOptimizerType. When set is not passed,
optimization method will run all the optimizer pass; otherwise, optimizer
method will run the optimization pass that is not included inside optimization_blacklist.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>A new optimized torch script module</p>
</dd>
</dl>
</dd></dl>
</div>
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