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https://issues.apache.org/jira/browse/SPARK-17508?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Bryan Cutler resolved SPARK-17508.
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Resolution: Won't Fix
Resolving this for now unless there is more interest in the fix
> Setting weightCol to None in ML library causes an error
> -------------------------------------------------------
>
> Key: SPARK-17508
> URL: https://issues.apache.org/jira/browse/SPARK-17508
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Affects Versions: 2.0.0
> Reporter: Evan Zamir
> Priority: Minor
>
> The following code runs without error:
> {code}
> spark = SparkSession.builder.appName('WeightBug').getOrCreate()
> df = spark.createDataFrame(
> [
> (1.0, 1.0, Vectors.dense(1.0)),
> (0.0, 1.0, Vectors.dense(-1.0))
> ],
> ["label", "weight", "features"])
> lr = LogisticRegression(maxIter=5, regParam=0.0, weightCol="weight")
> model = lr.fit(df)
> {code}
> My expectation from reading the documentation is that setting weightCol=None
> should treat all weights as 1.0 (regardless of whether a column exists).
> However, the same code with weightCol set to None causes the following errors:
> Traceback (most recent call last):
> File "/Users/evanzamir/ams/px-seed-model/scripts/bug.py", line 32, in
> <module>
> model = lr.fit(df)
> File "/usr/local/spark-2.0.0-bin-hadoop2.7/python/pyspark/ml/base.py", line
> 64, in fit
> return self._fit(dataset)
> File "/usr/local/spark-2.0.0-bin-hadoop2.7/python/pyspark/ml/wrapper.py",
> line 213, in _fit
> java_model = self._fit_java(dataset)
> File "/usr/local/spark-2.0.0-bin-hadoop2.7/python/pyspark/ml/wrapper.py",
> line 210, in _fit_java
> return self._java_obj.fit(dataset._jdf)
> File
> "/usr/local/spark-2.0.0-bin-hadoop2.7/python/lib/py4j-0.10.1-src.zip/py4j/java_gateway.py",
> line 933, in __call__
> File "/usr/local/spark-2.0.0-bin-hadoop2.7/python/pyspark/sql/utils.py",
> line 63, in deco
> return f(*a, **kw)
> File
> "/usr/local/spark-2.0.0-bin-hadoop2.7/python/lib/py4j-0.10.1-src.zip/py4j/protocol.py",
> line 312, in get_return_value
> py4j.protocol.Py4JJavaError: An error occurred while calling o38.fit.
> : java.lang.NullPointerException
> at
> org.apache.spark.ml.classification.LogisticRegression.train(LogisticRegression.scala:264)
> at
> org.apache.spark.ml.classification.LogisticRegression.train(LogisticRegression.scala:259)
> at
> org.apache.spark.ml.classification.LogisticRegression.train(LogisticRegression.scala:159)
> at org.apache.spark.ml.Predictor.fit(Predictor.scala:90)
> at org.apache.spark.ml.Predictor.fit(Predictor.scala:71)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:237)
> at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
> at py4j.Gateway.invoke(Gateway.java:280)
> at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:128)
> at py4j.commands.CallCommand.execute(CallCommand.java:79)
> at py4j.GatewayConnection.run(GatewayConnection.java:211)
> at java.lang.Thread.run(Thread.java:745)
> Process finished with exit code 1
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