pan class="lineno">41</span><span></span><span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Optional</span>
<span class="lineno">42</span>
<span class="lineno">43</span><span class="kn">import</span> <span class="nn">torch</span>
<span class="lineno">44</span><span class="kn">from</span> <span class="nn">torch</span> <span class="kn">import</span> <span class="n">nn</span></pre></div>
        </div>
    </div>
    <div class='section' id='section-1'>
 