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-rw-r--r--python/pyspark/ml/wrapper.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/python/pyspark/ml/wrapper.py b/python/pyspark/ml/wrapper.py
index 253705bde9..8218c7c5f8 100644
--- a/python/pyspark/ml/wrapper.py
+++ b/python/pyspark/ml/wrapper.py
@@ -136,7 +136,8 @@ class JavaEstimator(Estimator, JavaWrapper):
class JavaTransformer(Transformer, JavaWrapper):
"""
Base class for :py:class:`Transformer`s that wrap Java/Scala
- implementations.
+ implementations. Subclasses should ensure they have the transformer Java object
+ available as _java_obj.
"""
__metaclass__ = ABCMeta