Github user ajaysaini725 commented on a diff in the pull request:
https://github.com/apache/spark/pull/18888#discussion_r132597367
--- Diff: python/pyspark/ml/pipeline.py ---
@@ -242,3 +327,65 @@ def _to_java(self):
JavaParams._new_java_obj("org.apache.spark.ml.PipelineModel",
self.uid, java_stages)
return _java_obj
+
+
+@inherit_doc
+class SharedReadWrite():
+ """
+ Functions for :py:class:`MLReader` and :py:class:`MLWriter` shared
between
+ :py:class:'Pipeline' and :py:class'PipelineModel'
+
+ .. versionadded:: 2.3.0
+ """
+
+ @staticmethod
+ def validateStages(stages):
+ """
+ Check that all stages are Writable
+ """
+ for stage in stages:
+ if not isinstance(stage, MLWritable):
+ raise ValueError("Pipeline write will fail on this pipline
" +
+ "because stage %s of type %s is not
MLWritable",
+ stage.uid, type(stage))
+
+ @staticmethod
+ def saveImpl(instance, stages, sc, path):
+ """
+ Save metadata and stages for a :py:class:`Pipeline` or
:py:class:`PipelineModel`
+ - save metadata to path/metadata
+ - save stages to stages/IDX_UID
+ """
+ stageUids = [stage.uid for stage in stages]
+ jsonParams = {'stageUids': stageUids, 'savedAsPython': True}
+ DefaultParamsWriter.saveMetadata(instance, path, sc,
paramMap=jsonParams)
+ stagesDir = os.path.join(path, "stages")
+ for index, stage in enumerate(stages):
+ stage.write().save(SharedReadWrite
+ .getStagePath(stage.uid, index,
len(stages), stagesDir))
+
+ @staticmethod
+ def load(metadata, sc, path):
+ """
+ Load metadata and stages for a :py:class:`Pipeline` or
:py:class:`PipelineModel`
+
+ :return: (UID, list of stages)
+ """
+ stagesDir = os.path.join(path, "stages")
+ stageUids = metadata['paramMap']['stageUids']
+ stages = []
+ for index, stageUid in enumerate(stageUids):
+ stagePath = SharedReadWrite.getStagePath(stageUid, index,
len(stageUids), stagesDir)
+ stage = DefaultParamsReader.loadParamsInstance(stagePath, sc)
+ stages.append(stage)
+ return (metadata['uid'], stages)
+
+ @staticmethod
+ def getStagePath(stageUid, stageIdx, numStages, stagesDir):
--- End diff --
It should be used. Fixed this. Thanks!
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