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From "Bharath Venkatesh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-10592) deprecate weights and use coefficients instead in ML models
Date Wed, 25 May 2016 00:04:12 GMT

    [ https://issues.apache.org/jira/browse/SPARK-10592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15299190#comment-15299190
] 

Bharath Venkatesh commented on SPARK-10592:
-------------------------------------------

Hi Kai

I am trying to build a learning model in Spark 1.6 and I think I am hitting a bug related
to this deprecation.

This is our sample usecase.

Creating a learning model:
tokenizer = Tokenizer(inputCol=, outputCol=)
hashingTF = HashingTF(inputCol=tokenizer.getOutputCol(), outputCol=)
lr = LogisticRegression(maxIter=10, regParam=0.01)
pipeline = Pipeline(stages=[tokenizer, hashingTF, lr])
model = pipeline.fit(labeledData)

Creating a DF:
testData=sc.textFile('').map() 
testDf = sqlContext.createDataFrame(testData, schema).where()

Evaluate a target Dataset by calling Model.Transform:
predictionsDf = model.transform(testDf)

I am calling the transform function. The transform is in turn referring to weights which seems
to be deprecated. I am getting the below Warning.

Warning:
/usr/lib/spark/python/pyspark/ml/classification.py:207: UserWarning: weights is deprecated.
Use coefficients instead.
warnings.warn("weights is deprecated. Use coefficients instead.")

> deprecate weights and use coefficients instead in ML models
> -----------------------------------------------------------
>
>                 Key: SPARK-10592
>                 URL: https://issues.apache.org/jira/browse/SPARK-10592
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML, PySpark
>            Reporter: Xiangrui Meng
>            Assignee: Kai Jiang
>            Priority: Critical
>             Fix For: 1.6.0
>
>
> The name `weights` becomes confusing as we are supporting weighted instanced. As discussed
in https://github.com/apache/spark/pull/7884, we want to deprecate `weights` and use `coefficients`
instead:
> * Deprecate but do not remove `weights`.
> * Only make changes under `spark.ml`.



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