Changeset 42

Timestamp:

11/13/15 18:09:46 (9 years ago)

Author:

sherbold

Message:

• added CLA/CLAMI data processors (ASE 2015)
• modified normal WEKA training to have a fallback in case to few instances of a certain class (defect-prone, non-defect-prone) are available: it now uses ZeroR in that case, i.e., a trivial classifier that always predicts the class that appears more often.

Location:

trunk/CrossPare/src/de/ugoe/cs/cpdp

Files:

• dataprocessing/CLAMIProcessor.java (added)
• dataprocessing/CLAProcessor.java (added)
• training/WekaBaseTraining.java (modified) (2 diffs)
• training/WekaTraining.java (modified) (3 diffs)

trunk/CrossPare/src/de/ugoe/cs/cpdp/training/WekaBaseTraining.java

@@ -56 +56 @@
         classifierParams = Arrays.copyOfRange(params, 2, params.length);
 
-        classifier = setupClassifier();
+        //classifier = setupClassifier();
     }
 
@@ -64 +64 @@
     }
 
-    public Classifier setupClassifier() {
+    protected Classifier setupClassifier() {
         Classifier cl = null;
         try {

trunk/CrossPare/src/de/ugoe/cs/cpdp/training/WekaTraining.java

@@ -21 +21 @@
 
 import de.ugoe.cs.util.console.Console;
+import weka.classifiers.rules.ZeroR;
 import weka.core.Instances;
 
@@ -46 +47 @@
     @Override
     public void apply(Instances traindata) {
+        classifier = setupClassifier();
         PrintStream errStr = System.err;
         System.setErr(new PrintStream(new NullOutputStream()));
@@ -55 +57 @@
         }
         catch (Exception e) {
-            throw new RuntimeException(e);
+            if (e.getMessage().contains("Not enough training instances with class labels")) {
+                Console.traceln(Level.SEVERE,
+                                "failure due to lack of instances: " + e.getMessage());
+                Console.traceln(Level.SEVERE, "training ZeroR classifier instead");
+                classifier = new ZeroR();
+                try {
+                    classifier.buildClassifier(traindata);
+                }
+                catch (Exception e2) {
+                    throw new RuntimeException(e2);
+                }
+            }
+            else {
+                throw new RuntimeException(e);
+            }
         }
         finally {