<NME> ZeroCalibrator.java
<BEF> ADDFILE
<MSG> add identity calibrator and null calibrator to ensemble. use regdataset to train calibration

<DFF> @@ -0,0 +1,15 @@
+package edu.neu.ccs.pyramid.calibration;
+
+import org.apache.mahout.math.Vector;
+
+import java.io.Serializable;
+
+public class ZeroCalibrator implements Serializable, VectorCalibrator {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public double calibrate(Vector vector) {
+        return 0;
+    }
+}

add identity calibrator and null calibrator to ensemble. use regdataset to train calibration