Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5885#discussion_r29699484
--- Diff: python/pyspark/ml/pipeline.py ---
@@ -168,3 +168,24 @@ def transform(self, dataset, params={}):
for t in self.transformers:
dataset = t.transform(dataset, paramMap)
return dataset
+
+
+class Evaluator(object):
+ """
+ Base class for evaluators that compute metrics from predictions.
+ """
+
+ __metaclass__ = ABCMeta
+
+ @abstractmethod
+ def evaluate(self, dataset, params={}):
--- End diff --
Python cannot overload methods. So it should be both `paramMaps` and
`paramMap`. I used `params` here.
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