Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/87
There are several design options to consider:
1) move `-iter` and `-mini-batch` functionalities to LeanerBaseUDTF
=> but, it cannot be used for MulticlassOnlineClassifier.. :-(
2) make BinaryOnlineClassfierUDTF/RegressionBaseUDTF the subclass of
GeneraLearnerBaseUDTF
=> regression bug may occur ..
3) make Abstract IterativeLearnerBaseUDTF as the subclass of
LearnerBaseUDTF
=> too complex object hierarchy (not good design)
4) implement `-iter` and `-mini-batch` functionalities in
BinaryOnlineClassfierUDTF/RegressionBaseUDTF
=> duplicate code, hard for maintenance
5) Mixin iteration supoprt
=> callback is needed and not a pattern for mixin
6) generalize `-iter` support for MulticlassOnelineClassifierUDTF
=> not straightforward design
Also, `-mini_batch` design should be well revised for online perceptron
variants.
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