al
inference. The approximation is a Gaussian in the unconstrained variable space.
Stan implements two variational algorithms. The <code>algorithm=meanfield</code> option
uses a fully factorized Gaussian for the approximation.
The <code>algorithm=fullrank</code> option uses a Gaussian with a full-rank
covariance matrix for the approximation.</p>
<p>The executable does not need to be recompiled in order to
switch to variational inference, and the data input format is the
same. The following is a minimal call