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[branch-1.1][SPARK-3990] add a note on ALS usage #3190

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[branch-1.1][SPARK-3990] add a note on ALS usage #3190

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56ad70e
add a note about SPARK-3990
mengxr Nov 10, 2014
53725b0
add a note about SPARK-3990
mengxr Nov 10, 2014
d4818f3
fix python style
mengxr Nov 11, 2014
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12 changes: 12 additions & 0 deletions python/pyspark/mllib/recommendation.py
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Expand Up @@ -60,6 +60,18 @@ def predictAll(self, usersProducts):

class ALS(object):

"""Alternating Least Squares matrix factorization.

SPARK-3990: In Spark 1.1.x, we use Kryo serialization by default in
PySpark. ALS does not work under this default setting. You can switch
back to the default Java serialization by setting:

spark.serializer=org.apache.spark.serializer.JavaSerializer

Please go to http://spark.apache.org/docs/latest/configuration.html
for instructions on how to configure Spark.
"""

@classmethod
def train(cls, ratings, rank, iterations=5, lambda_=0.01, blocks=-1):
sc = ratings.context
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