Yunfeng Zhou created FLINK-27742:
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Summary: Fix Compatibility Issues Between Flink ML Operators.
Key: FLINK-27742
URL: https://issues.apache.org/jira/browse/FLINK-27742
Project: Flink
Issue Type: Bug
Components: Library / Machine Learning
Affects Versions: ml-2.0.0
Reporter: Yunfeng Zhou
It is discovered that StringIndexer and LogisticRegression in Flink ML cannot
be connected in a pipeline. The reason is that the output label column of
StringIndexer is integer, while LogisticRegression can only accept input data
whose labels are doubles.
In order to make Flink ML stages compatible with each other, the following
changes need to be made.
- For stages who can only accept double-typed inputs, update their
implementation to accept any numerical type.
- For stages that generates labels as integers, make them return labels as
doubles.
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