[jvm-packages] Fixed a signature of XGBoostModel.predict #2476
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Prior to this commit XGBoostModel.predict produced an RDD with an array of predictions for each partition, effectively changing the shape wrt the input RDD. A more natural contract for prediction API is that given an RDD it returns a new RDD with the same number of elements. This allows the users to easily match inputs with predictions. This commit removes one layer of nesting in XGBoostModel.predict output. Even though the change is clearly non-backward compatible, I still think it is well justified. See discussion in 06bd5dc for motivation.
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merged, thx |
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Prior to this commit XGBoostModel.predict produced an RDD with
an array of predictions for each partition, effectively changing
the shape wrt the input RDD. A more natural contract for prediction
API is that given an RDD it returns a new RDD with the same number
of elements. This allows the users to easily match inputs with
predictions.
This commit removes one layer of nesting in XGBoostModel.predict output.
Even though the change is clearly non-backward compatible, I still
think it is well justified. See discussion in 06bd5dc for motivation.