an class="kc">None</span><span class="p">))</span>
    <span class="n">f</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">abs</span><span class="p">(</span><span class="n">mean_error</span><span class="p">(</span><span class="n">targets</span><span class="p">,</span> <span class="n">ref</span><span class="p">,</span> <span class="kc">None</span><span class="p">))</span>

    <span class="n">score</span> <span class="o">=</span> <span class="mf">1.0</span> <spa