ints are specified, we turn on the corresponding monotonic constraints in XGB.</p></li>
</ul>
<p>In summary, the XGB1 model is a special variant of XGB that restricts the maximum depth of the tree to 1. It is interpretable since it can be interpreted as a GAM with piecewise constant main effects. The model can be made more interpretable by the <strong>monotonicity</strong> and <strong>sparsity</strong> constraints.</p>
<section id="model-training">
<h2><span class="section-number">5.5.1. </span>Model Traini