ls.metadata_routing.UNCHANGED</code>) retains the
existing request. This allows you to change the request for some
parameters and not others.</p>
<div class="admonition versionadded">
<p class="admonition-title">Added in version:&ensp;1.3</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This method is only relevant if this estimator is used as a
sub-estimator of a meta-estimator, e.g. used inside a
:class:<code>~sklearn.pipeline.Pipeline</code>. Otherwise it has no effect.</p