Merge pull request #121 from openml/hotfix/class-label

 runs.run_task now works if the target feature the attribute name 'class' is capitalized.

Author: mfeurer

openml/datasets/dataset.py

@@ -249,6 +249,8 @@ def _retrieve_class_labels(self):
         dataAttributes = dict(arffData['attributes'])
         if('class' in dataAttributes):
             return dataAttributes['class']
+        elif('Class' in dataAttributes):
+            return dataAttributes['Class']
         else:
             return None