[jira] [Created] (IGNITE-6864) Apply refactorings to decision trees code.

[Anton Vinogradov (Jira)]

Artem Malykh created IGNITE-6864:
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             Summary: Apply refactorings to decision trees code.
                 Key: IGNITE-6864
                 URL: https://issues.apache.org/jira/browse/IGNITE-6864
             Project: Ignite
          Issue Type: Task
      Security Level: Public (Viewable by anyone)
            Reporter: Artem Malykh


* Think about changes signatures in MNISTUtils, maybe we should use collections or arrays instead of streams.
* Add tests for CacheUtils new methods used in ColumnDecisionTreeTrainer
* Think about OpenBitSet insead of SparseBitSet and BitSet
* Consider making decision tree internal structure classes



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