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<span class="k">def</span> <span class="nf">willmott_score</span><span class="p">(</span><span class="n">predictions</span><span class="p">,</span> <span class="n">targets</span><span class="p">,</span> <span class="n">ref</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="w">    </span><span class="sd">&quot;&quot;&quot;Calculate a Nash-Sutcliffe-like sk