eval ds
Refactor LBatchView
Debug msg for printing model
Eval param for EventsDataSource, first try
Refactor data view.
ItemRank genQASeq
itemrank QA seq
ItemRank Metrics
Merge branch 'jy' into develop
ItemRank metrics
ItemRank cleaning
Itemrank more clean
fix bug due to json4s change
Merge branch 'develop' of https://github.com/PredictionIO/PredictionIO into develop
Merge branch 'develop' of https://github.com/PredictionIO/PredictionIO into develop