del that is refined locally 
 at this node.</dd><dd><code>totalInstanceWeight</code> - the total number of training examples</dd><dd><code>higherNumParameters</code> - effective number of parameters in the logistic regression model built
 in parent nodes</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.Exception</code> - if something goes wrong</dd></dl>
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