WeichenXu123 commented on a change in pull request #30471:
URL: https://github.com/apache/spark/pull/30471#discussion_r529099004
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File path: python/pyspark/ml/tuning.py
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@@ -207,6 +210,205 @@ def _to_java_impl(self):
return java_estimator, java_epms, java_evaluator
+class _ValidatorSharedReadWrite:
+
+ @staticmethod
+ def saveImpl(path, instance, sc, extraMetadata=None):
+ from pyspark.ml.classification import OneVsRest
+ numParamsNotJson = 0
+ jsonEstimatorParamMaps = []
+ for paramMap in instance.getEstimatorParamMaps():
+ jsonParamMap = []
+ for p, v in paramMap.items():
+ jsonParam = {'parent': p.parent, 'name': p.name}
+ if (isinstance(v, Estimator) and not (
+ isinstance(v, _ValidatorParams) or
+ isinstance(v, OneVsRest))
+ ) or isinstance(v, Transformer) or \
+ isinstance(Evaluator):
+ relative_path = f'epm_{p.name}{numParamsNotJson}'
+ param_path = os.path.join(path, relative_path)
+ numParamsNotJson += 1
+ v.save(param_path)
+ jsonParam['value'] = relative_path
+ jsonParam['isJson'] = False
Review comment:
For the case:
CrossValidator on estimator of OneVsRest, and need to turning the parameter
`OneVsRest.classifier`, then EstimatorParamMaps will include a param
(OneVsRest.classifier -> A_Classifier)
We need to consider how to saving Classifier type param value.
This is what the code do:
* if it is normal param, we save it as Json format and `isJson` field is
True.
* otherwise set `isJson` field False, and save it by object.save().
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