Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/149
BTW, it might be better to implement `early stopping` using validation data.
https://github.com/guestwalk/libffm
We can use a similar approaches to `_validationRatio` used in
`FactorizationMachineUDTF` instead of preparing validation dataset.---
