span class="n">nn</span><span class="o">.</span><span class="n">Module</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
        <span class="n">ctx</span><span class="p">:</span> <span class="n">torch</span><span class="o">.</span><span class="n">Tensor</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
        <span class="n">target</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="kc">None<