    <span class="n">plt</span><span class="o">.</span><span class="n">grid</span><span class="p">(</span><span class="n">which</span><span class="o">=</span><span class="s1">'major'</span><span class="p">)</span>

    <span class="k">if</span> <span class="n">eval_dir</span><span class="p">:</span>
        <span class="n">output_path</span> <span class="o">=</span> <span class="sa">f</span><span class="s1">'</span><span class="si">{</span><span class="n">eval_dir</span><span class="si">}</span><span class="