<NME> GradientBoosting.java
<BEF> ADDFILE
<MSG> add Ensemble, Gradient Boosting

<DFF> @@ -0,0 +1,21 @@
+package edu.neu.ccs.pyramid.optimization.gradient_boosting;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by chengli on 10/1/15.
+ */
+public class GradientBoosting {
+    protected int numEnsembles;
+    protected List<Ensemble> ensembles;
+
+    public GradientBoosting(int numEnsembles) {
+        this.numEnsembles = numEnsembles;
+        this.ensembles = new ArrayList<>();
+        for (int k=0;k<numEnsembles;k++){
+            ensembles.add(new Ensemble());
+        }
+    }
+    
+}

add Ensemble, Gradient Boosting