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package optimization.stopCriteria;
import optimization.gradientBasedMethods.Objective;
import optimization.util.MathUtils;
public class NormalizedValueDifference 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 NormalizedValueDifference(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 != 0){
double valueDiff = Math.abs(previousValue - currentValue)/Math.abs(previousValue);
if( valueDiff < valueConvergenceValue){
System.out.println("Leaving different in values is to small: Prev "
+ (previousValue/previousValue) + " Curr: " + (currentValue/previousValue)
+ " diff: " + valueDiff);
return true;
}
}else{
double valueDiff = Math.abs(previousValue - currentValue);
if( valueDiff < valueConvergenceValue){
System.out.println("Leaving different in values is to small: Prev "
+ (previousValue) + " Curr: " + (currentValue)
+ " diff: " + valueDiff);
return true;
}
}
return false;
}
}
}
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