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<h4>read</h4>
<pre>public&nbsp;void&nbsp;read(java.lang.String&nbsp;fileName)</pre>
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<pre>public&nbsp;void&nbsp;train()</pre>
<div class="block">Trains a descriptor matcher

     Trains a descriptor matcher (for example, the flann index). In all methods to match, the method
     train() is run every time before matching. Some descriptor mat