Qiping Li created SPARK-3022:
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Summary: FindBinsForLevel in decision tree should call findBin
only once for each feature
Key: SPARK-3022
URL: https://issues.apache.org/jira/browse/SPARK-3022
Project: Spark
Issue Type: Improvement
Components: MLlib
Affects Versions: 1.0.2
Reporter: Qiping Li
`findbinsForLevel` is applied to every `LabeledPoint` to find bins for all
nodes at a given level. Given a specific `LabeledPoint` and a specific feature,
the bin to put this labeled point should always be same.But in current
implementation, `findBin` on a (labeledpoint, feature) pair is called for every
node at a given level, which is a waste of computation. I proposed to call
`findBin` only once and if a `LabeledPoint` is valid on a node, this result can
be reused.
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