Github user takuti commented on the issue:
https://github.com/apache/incubator-hivemall/pull/89
At first, I planned to replace `String[][] miniBatch` with things like
`FeatureValue[][] miniBatch` similarly to the generic predictor implementation;
that is, instead of dealing word counts as String e.g. "foo:10," I tried to
represent them as `FeatureValue` for readability. However, since
`PLSAPredictionUDAF` and `LDAPredictionUDAF` need to create OI for such word
counts, Java standard string object is much more handy rather than
`FeatureValue` objects.
Thus, document is still represented as an array (or list) of String for now.
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