ode> if provided. The request is ignored if metadata is not provided.</p>
</li>
<li>
<p><code>False</code>: metadata is not requested and the meta-estimator will not pass it to <code>fit</code>.</p>
</li>
<li>
<p><code>None</code>: metadata is not requested, and the meta-estimator will raise an error if the user provides it.</p>
</li>
<li>
<p><code>str</code>: metadata should be passed to the meta-estimator with this given alias instead of the original name.</p>
</li>
</ul>
<p>The default (<code>sklearn.uti