s="n">Y</span><span class="p">,</span> <span class="n">env_Y</span><span class="p">),</span> <span class="n">env_X</span><span class="p">)</span>

        <span class="c1"># istft</span>
        <span class="n">y_spec_env_x</span><span class="p">[:,</span> <span class="n">c</span><span class="p">]</span> <span class="o">=</span> <span class="n">istft</span><span class="p">(</span><span class="n">Y_spec_env_X</span><span class="p">,</span> <span class="n">syn_hop</span><span class="o">=</span><span class="n"