s="p">):</span>
        <span class="n">nx</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">unsqueeze</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span><span class="o">.</span><span class="n">detach</span><span class="p">()</span>
        <span class="n">nx</span><span class="o">.</span><span class="n">requires_grad_</span><span class="p">()</span>
        <span class="n">eta</