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  <div class="section" id="python-object-model">
<h1>python.object-model<a class="headerlink" href="#python-object-model" title="Permalink to this heading">¶</a></h1>
<div class="section" id="model-attr-mutation">
<h2>model_attr_mutation<a class="headerlink" href="#model-attr-mutation" title="Permalink to this heading">¶</a></h2>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Tags: <a class="reference internal" href="#"><span class="doc">python.object-model</span></a></p>
<p>Support Level: NOT_SUPPORTED_YET</p>
</div>
<p>Original source code:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">torch</span>


<span class="k">class</span> <span class="nc">ModelAttrMutation</span><span class="p">(</span><span class="n">torch</span><span class="o">.</span><span class="n">nn</span><span class="o">.</span><span class="n">Module</span><span class="p">):</span>
<span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Attribute mutation is not supported.</span>
<span class="sd">    &quot;&quot;&quot;</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="o">.</span><span class="fm">__init__</span><span class="p">()</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">attr_list</span> <span class="o">=</span> <span class="p">[</span><span class="n">torch</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">2</span><span class="p">),</span> <span class="n">torch</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">2</span><span class="p">)]</span>

    <span class="k">def</span> <span class="nf">recreate_list</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="p">[</span><span class="n">torch</span><span class="o">.</span><span class="n">zeros</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">2</span><span class="p">),</span> <span class="n">torch</span><span class="o">.</span><span class="n">zeros</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">2</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="bp">self</span><span class="o">.</span><span class="n">attr_list</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">recreate_list</span><span class="p">()</span>
        <span class="k">return</span> <span class="n">x</span><span class="o">.</span><span class="n">sum</span><span class="p">()</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">attr_list</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">sum</span><span class="p">()</span>
</pre></div>
</div>
<p>Result:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="ne">AssertionError</span><span class="p">:</span> <span class="n">Mutating</span> <span class="n">module</span> <span class="n">attribute</span> <span class="n">attr_list</span> <span class="n">during</span> <span class="n">export</span><span class="o">.</span>
</pre></div>
</div>
</div>
<div class="section" id="optional-input">
<h2>optional_input<a class="headerlink" href="#optional-input" title="Permalink to this heading">¶</a></h2>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Tags: <a class="reference internal" href="#"><span class="doc">python.object-model</span></a></p>
<p>Support Level: NOT_SUPPORTED_YET</p>
</div>
<p>Original source code:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">torch</span>


<span class="k">class</span> <span class="nc">OptionalInput</span><span class="p">(</span><span class="n">torch</span><span class="o">.</span><span class="n">nn</span><span class="o">.</span><span class="n">Module</span><span class="p">):</span>
<span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Tracing through optional input is not supported yet</span>
<span class="sd">    &quot;&quot;&quot;</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">y</span><span class="o">=</span><span class="n">torch</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)):</span>
        <span class="k">if</span> <span class="n">y</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
            <span class="k">return</span> <span class="n">x</span> <span class="o">+</span> <span class="n">y</span>
        <span class="k">return</span> <span class="n">x</span>
</pre></div>
</div>
<p>Result:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="ne">AssertionError</span><span class="p">:</span> <span class="n">graph</span><span class="o">-</span><span class="n">captured</span> <span class="nb">input</span> <span class="c1">#2, of type &lt;class &#39;torch.Tensor&#39;&gt;, is not among original inputs of types: (&lt;class &#39;torch.Tensor&#39;&gt;)</span>
</pre></div>
</div>
</div>
</div>


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