Github user jkbradley commented on a diff in the pull request: https://github.com/apache/spark/pull/18742#discussion_r131287028 --- Diff: python/pyspark/ml/util.py --- @@ -61,20 +66,74 @@ def _randomUID(cls): @inherit_doc -class MLWriter(object): +class BaseReadWrite(object): + """ + Base class for MLWriter and MLReader. Stores information about the SparkContext + and SparkSession. + + .. versionadded:: 2.3.0 + """ + + def __init__(self): + self._sparkSession = None + + def context(self, sqlContext): + """ + Sets the Spark SQLContext to use for saving/loading. + + .. note:: Deprecated in 2.1 and will be removed in 3.0, use session instead. + """ + raise NotImplementedError("MLWriter is not yet implemented for type: %s" % type(self)) + + def session(self, sparkSession): + """ + Sets the Spark Session to use for saving/loading. + """ + self._sparkSession = sparkSession + return self + + def sparkSession(self): + if self._sparkSession is None: + self._sparkSession = SparkSession.builder.getOrCreate() + return self._sparkSession + + @property + def sc(self): + return self.sparkSession().sparkContext + + +@inherit_doc +class MLWriter(BaseReadWrite): """ Utility class that can save ML instances. .. versionadded:: 2.0.0 """ + def __init__(self): + super(MLWriter, self).__init__() + self.shouldOverwrite = False + + def _handleOverwrite(self, path): + from pyspark.ml.wrapper import JavaWrapper + + _java_obj = JavaWrapper._new_java_obj("org.apache.spark.ml.util.FileSystemOverwrite") + wrapper = JavaWrapper(_java_obj) + wrapper._call_java("handleOverwrite", path, True, self.sc._jsc.sc()) + def save(self, path): """Save the ML instance to the input path.""" + if self.shouldOverwrite: + self._handleOverwrite(path) + self.saveImpl(path) + + def saveImpl(self, path): --- End diff -- Add doc from Scala
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