Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/51
@maropu
To reduce memory consumption, I'm considering to replace `int[][] order`
with `CompressedIntStream[]`.
https://github.com/myui/incubator-hivemall/blob/7dba520cb709326edffb945dd925876433200a93/core/src/main/java/hivemall/smile/classification/RandomForestClassifierUDTF.java#L343
`CompressedIntStream` should support streaming construction and should
support streaming decompression in
https://github.com/myui/incubator-hivemall/blob/7dba520cb709326edffb945dd925876433200a93/core/src/main/java/hivemall/smile/classification/DecisionTree.java#L551
Any good algorithm or library for fast integer sequence
compression/decompression?
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