Maciej Szymkiewicz created SPARK-30504:
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Summary: OneVsRest and OneVsRestModel _from_java and _to_java
should handle weightCol
Key: SPARK-30504
URL: https://issues.apache.org/jira/browse/SPARK-30504
Project: Spark
Issue Type: Bug
Components: ML, PySpark
Affects Versions: 3.0.0
Reporter: Maciej Szymkiewicz
Current behaviour
{code:python}
from pyspark.ml.classification import LogisticRegression, OneVsRest,
OneVsRestModel
from pyspark.ml.linalg import DenseVector
df = spark.createDataFrame([(0, 1, DenseVector([1.0, 0.0])), (0, 1,
DenseVector([1.0, 0.0]))], ("label", "w", "features"))
ovr = OneVsRest(classifier=LogisticRegression()).setWeightCol("w")
ovrm = ovr.fit(df)
ovr.getWeightCol()
## 'w'
ovrm.getWeightCol()
## 'w'
ovr.write().overwrite().save("/tmp/ovr")
ovr_ = OneVsRest.load("/tmp/ovr")
ovr_.getWeightCol()
## KeyError
## ...
## KeyError: Param(parent='OneVsRest_5145d56b6bd1', name='weightCol',
doc='weight column name. ...)
ovrm.write().overwrite().save("/tmp/ovrm")
ovrm_ = OneVsRestModel.load("/tmp/ovrm")
ovrm_ .getWeightCol()
## KeyError
## ...
## KeyError: Param(parent='OneVsRestModel_598c6d900fad', name='weightCol',
doc='weight column name ...
{code}
Expected behaviour:
{{OneVsRest}} and {{ OneVsRestModel}} loaded from disk should have
{{weightCol}}.
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