n class="mi">300</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Optimize objective function hyperparameters using controller and child model</span>

<span class="sd">        Args:</span>
<span class="sd">            iterations (int): number of optimization iterations, which the child model will be run</span>

<span class="sd">        Returns:</span>
<span class="sd">            pandas.DataFrame: top policies (with highest expected accuracy increase)</span>
<span class="sd">      