s (<code>'params'</code>)</li>
<li>Bounds on the parameters (<code>'param_bounds'</code>)</li>
<li>A function that defines a boundary for the respective model (<code>'boundary'</code>)</li>
<li>The number of parameters (<code>'n_params'</code>)</li>
<li>Defaults for the parameters (<code>'default_params'</code>)</li>
<li>The number of choices the process can produce (<code>'nchoices'</code>)</li>
</ul>
<p>The <code>'hddm_include'</code> key concerns information useful for integration with the <a href="https