"n">tensor</span><span class="p">(</span><span class="mf">0.</span><span class="p">))</span>
        <span class="n">negative_mask</span> <span class="o">=</span> <span class="n">g</span><span class="o">.</span><span class="n">op</span><span class="p">(</span><span class="s1">&#39;Less&#39;</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">torch</span><span class="o">.</span><span class="n">tensor</span><span class="p">(</span><span class="mf">0.</span><span cla