Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/12464#discussion_r61331680
--- Diff: python/pyspark/ml/tuning.py ---
@@ -346,10 +346,11 @@ class CrossValidatorModel(Model, ValidatorParams,
MLReadable, MLWritable):
.. versionadded:: 1.4.0
"""
- def __init__(self, bestModel):
+ def __init__(self, bestModel, avgMetrics):
--- End diff --
I just realized we should add a default value for avgMetrics since it is
technically a public API. How about a value of ```[]``` by default?
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