Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/4444#issuecomment-73616554
The question is whether we want to save `stats`, which contains information
that is already included in other nodes except `gain`. (Correct me if I'm
wrong.) I'm considering replacing `stats` by `infoGain: Double` and
re-construct other fields in `InformationGainStats` at `load()`. The schema
becomes
~~~
id: Int
predict/
|- predict: Double
|- prob: Double
impurity: Double
isLeaf: Boolean
split/
|- feature: Int
|- threshold: Double
|- featureType: Int
|- categories: Array[Double]
leftNodeId: Integer
rightNodeId: Integer
infoGain: Double
~~~
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