div class="comment cmt"><p>Abstract base class for indices used to retrieve nearest neighbors in an approximate decision strategy.
</p></div><dl class="paramcmts block"><dt class="tparam">T</dt><dd class="cmt"><p>The type of the parent</p></dd><dt class="tparam">U</dt><dd class="cmt"><p>The type of the decision</p></dd></dl><div class="toggleContainer block">
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