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AIMA-Java Core Algorithms from the book Artificial Intelligence a Modern Approach 3rd Ed.

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package aima.core.search.framework.evalfunc;

import aima.core.search.framework.Node;

/**
 * Artificial Intelligence A Modern Approach (3rd Edition): page 92.

 * 

 * The evaluation function is construed as a cost estimate, so the node with the
 * lowest evaluation is expanded first.
 * 
 * @author Ciaran O'Reilly
 * 
 */
public interface EvaluationFunction {
	double f(Node n);
}