Zhe Sun created SPARK-19797:
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Summary: ML pipelines document error
Key: SPARK-19797
URL: https://issues.apache.org/jira/browse/SPARK-19797
Project: Spark
Issue Type: Bug
Components: ML
Affects Versions: 2.1.0
Reporter: Zhe Sun
Priority: Trivial
Description about pipeline in this paragraph is incorrect
https://spark.apache.org/docs/latest/ml-pipeline.html#how-it-works, which
misleads the user
bq. If the Pipeline had more *stages*, it would call the
LogisticRegressionModel’s transform() method on the DataFrame before passing
the DataFrame to the next stage.
The description is not accurate, because *Transformer* could also be a stage.
But only another Estimator will invoke an extra transform call.
So, the description should be corrected as: *If the Pipeline had more
_Estimators_*.
The code to prove it is here
https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/Pipeline.scala#L160
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