 model_type to NULL and specify custom_fit and custom_predict to use your custom model.</p></dd>


<dt id="arg-learner-type">learner_type<a class="anchor" aria-label="anchor" href="#arg-learner-type"></a></dt>
<dd><p>The learner type for the chosen model. Options include <code>"ridge"</code> for Ridge Regression, <code>"fnn"</code> for Feedforward Neural Network and <code>"caret"</code> for Caret. Default is <code>"ridge"</code>. if model_type is 'causal_forest', choose NULL, if model_type is 's_learner' or