add optimization library source code

git-svn-id: https://ws10smt.googlecode.com/svn/trunk@204 ec762483-ff6d-05da-a07a-a48fb63a330f

1 files changed, 45 insertions, 0 deletions

diff --git a/gi/posterior-regularisation/prjava/src/optimization/linesearch/WolfeConditions.java b/gi/posterior-regularisation/prjava/src/optimization/linesearch/WolfeConditions.java
new file mode 100644
index 00000000..dcc704eb
--- /dev/null
+++ b/gi/posterior-regularisation/prjava/src/optimization/linesearch/WolfeConditions.java
@@ -0,0 +1,45 @@
+package optimization.linesearch;
+
+
+public class WolfeConditions {
+	
+	/**
+	 * Sufficient Increase number. Default constant
+	 */
+	
+	
+	/**
+	 * Value for suficient curvature:
+	 * 0.9 - For newton and quase netwon methods
+	 * 0.1 - Non linear conhugate gradient
+	 */
+	
+	int debugLevel = 0;
+	public void setDebugLevel(int level){
+		debugLevel = level;
+	}
+	
+	public  static boolean suficientDecrease(DifferentiableLineSearchObjective o, double c1){	
+		double value = o.getOriginalValue()+c1*o.getAlpha()*o.getInitialGradient();
+//		System.out.println("Sufficient Decrease original "+value+" new "+  o.getCurrentValue());
+		return o.getCurrentValue() <= value;
+	}
+	
+	
+
+
+	public static boolean sufficientCurvature(DifferentiableLineSearchObjective o, double c1, double c2){
+//		if(debugLevel >= 2){
+//			double current = Math.abs(o.getCurrentGradient());
+//			double orig = -c2*o.getInitialGradient();
+//			if(current <= orig){
+//				return true;
+//			}else{
+//				System.out.println("Not satistfying curvature condition curvature " + current + " wants " + orig);
+//				return false;
+//			}
+//		}
+		return Math.abs(o.getCurrentGradient()) <= -c2*o.getInitialGradient();
+	}
+	
+}