n><span class="n">TensorProtoDataType</span><span class="o">.</span><span class="n">FLOAT</span><span class="p">)</span>
        <span class="n">y</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;Sub&#39;</span><span class="p">,</span> <span class="n">positive_mask</span><span class="p">,</span> <span class="n">negative_mask</span><span class="p">)</span>
        <span class="k">return</span> <span class="n