steps in boosting techniques, a function returning complexity parameter for model fitted with fit.fun, see Details. Alternatively, one explicit value for the complexity or a vector of values can be passed. In the latter case, the model fit is carried out for each of the complexity parameters. Alternatively, a named list can be passed, if complexity is a tuple of different parameter values.</p></td>
    </tr>
    <tr>
      <th>args.fit</th>
      <td><p>named list of arguments to be passed to the function g