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<h4>empty</h4>
<pre>public&nbsp;boolean&nbsp;empty()</pre>
<div class="block">Returns true if there are no train descriptors in the both collections.</div>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../org/opencv/core/Algorithm.html#empty--">empty</a></code>&nbsp;in class&nbsp;<code><a href="../../../org/opencv/core/Algorithm.html" title="class in org.opencv.core">Algorithm</a></code></dd>
<dt><