an>

        <span class="c1"># For the descriptor, the output size for each job depends on the exact arguments.</span>
        <span class="c1"># Here we precalculate the size for each job to preallocate memory and</span>
        <span class="c1"># make the process faster.</span>
        <span class="n">n_features</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_number_of_features</span><span class="p">()</span>

        <span class="k">def</span> <spa