k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">vec_lists</span><span class="p">]</span>
        <span class="k">if</span> <span class="n">derivatives_shape</span><span class="p">:</span>
            <span class="k">if</span> <span class="n">is_sparse</span><span class="p">:</span>
                <span class="n">derivatives</span> <span class="o">=</span> <span class="n">sp</span><span class="o">.</span><span class="n">concatenate</span><span class="p">(</span><span class=