<span class="fu"><a href="reference/fit_tuner.html">fit_tuner</a></span><span class="op">(</span><span class="va">x_data</span>,<span class="va">y_data</span>,</span>
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<span>                    validation_data <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/list.html" class="external-link">list</a></span><span class="op">(</span><span class="va">x_data2</span>,<span class="va">y_data2</spa