Github user takuti commented on the issue:
https://github.com/apache/incubator-hivemall/pull/149
Make sense as a compromise in terms of memory consumption.
I'll note on documentation to clarify the fact that our `-early_stopping`
option does not return the best of the best model; users expect the option
returns the best model achieved at the 7-th iteration, but our UDF does not
behave so as discussed above.---
