span class="n">empty</span><span class="p">(</span><span class="n">shape_der</span><span class="p">,</span> <span class="n">dtype</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">dtype</span><span class="p">)</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">derivatives</span> <span class="o">=</span> <span class="p">[]</span>
            <span class="k">if</span> <span class="n">descriptor_shape</span><spa