Github user yinxusen commented on a diff in the pull request:
https://github.com/apache/spark/pull/11683#discussion_r56223502
--- Diff: python/pyspark/ml/pipeline.py ---
@@ -15,116 +15,87 @@
# limitations under the License.
#
-from abc import ABCMeta, abstractmethod
+import sys
+if sys.version > '3':
+ basestring = str
+
+from pyspark import SparkContext
from pyspark import since
+from pyspark.ml import Estimator, Model, Transformer
from pyspark.ml.param import Param, Params
-from pyspark.ml.util import keyword_only
+from pyspark.ml.util import keyword_only, JavaMLWriter, JavaMLReader
+from pyspark.ml.wrapper import JavaWrapper
from pyspark.mllib.common import inherit_doc
-@inherit_doc
-class Estimator(Params):
+def _stages_java2py(java_stages):
"""
- Abstract class for estimators that fit models to data.
-
- .. versionadded:: 1.3.0
+ Transforms the parameter Python stages from a list of Java stages.
+ :param java_stages: An array of Java stages.
+ :return: An array of Python stages.
"""
- __metaclass__ = ABCMeta
+ for stage in java_stages:
+ assert(stage.getClass().getName() != "org.apache.spark.Pipeline" or
--- End diff --
I'd prefer to move the assertion into
`JavaWrapper._transfer_stage_from_java()`, then I can use `isinstance(py_stage,
JavaWrapper)` which is more precise.
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