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package optimization.stopCriteria;
import optimization.gradientBasedMethods.Objective;
import optimization.util.MathUtils;
public class ValueDifference implements StopingCriteria{
/**
* Stop if the different between values is smaller than a treshold
*/
protected double valueConvergenceValue=0.01;
protected double previousValue = Double.NaN;
protected double currentValue = Double.NaN;
public ValueDifference(double valueConvergenceValue){
this.valueConvergenceValue = valueConvergenceValue;
}
public void reset(){
previousValue = Double.NaN;
currentValue = Double.NaN;
}
public boolean stopOptimization(Objective obj){
if(Double.isNaN(currentValue)){
currentValue = obj.getValue();
return false;
}else {
previousValue = currentValue;
currentValue = obj.getValue();
if(previousValue - currentValue < valueConvergenceValue){
// System.out.println("Leaving different in values is to small: Prev "
// + previousValue + " Curr: " + currentValue
// + " diff: " + (previousValue - currentValue));
return true;
}
return false;
}
}
}
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