><p>The model function for which parameters are being validated (e.g., <code><a href="https://rdrr.io/pkg/grf/man/causal_forest.html" class="external-link">grf::causal_forest</a></code>).</p></dd>


<dt id="arg-model-type">model_type<a class="anchor" aria-label="anchor" href="#arg-model-type"></a></dt>
<dd><p>The model type for policy learning. Options include <code>"causal_forest"</code>, <code>"s_learner"</code>, and <code>"m_learner"</code>. Default is <code>"causal_forest"</code>. Note: you can also set