<spanclass="n">x</span><spanclass="o">=</span><spanclass="n">x</span><spanclass="o">.</span><spanclass="n">values</span><spanclass="c1"># Unpack pandas Series and DataFrames.</span>
<spanclass="k">for</span><spanclass="bp">cls</span><spanclass="ow">in</span><spanclass="nb">type</span><spanclass="p">(</span><spanclass="n">x</span><spanclass="p">)</span><spanclass="o">.</span><spanclass="vm">__mro__</span><spanclass="p">:</span><spanclass="c1"># Look up in the cache.</span>