[GitHub] [incubator-hivemall] myui opened a new pull request #185: [HIVEMALL-243] Fix nominal variable handling in DecisionTree and RegressionTre

[GitBox <gi...@apache.org>]

myui opened a new pull request #185: [HIVEMALL-243] Fix nominal variable handling in DecisionTree and RegressionTre
URL: https://github.com/apache/incubator-hivemall/pull/185
 
 
   ## What changes were proposed in this pull request?
   
   For NOMINAL variable, the maximum attribute index 'm' is used for computing splits.
   
   This cause performance issues for sparse nominal variables. So, revise this handling for a better performance.
   
   https://github.com/apache/incubator-hivemall/blob/master/core/src/main/java/hivemall/smile/classification/DecisionTree.java#L703
   
   ## What type of PR is it?
   
   Improvement
   
   ## What is the Jira issue?
   
   (Put link here and add [HIVEMALL-*Jira number*] in PR title, e.g., [HIVEMALL-533])
   
   ## How was this patch tested?
   
   https://issues.apache.org/jira/browse/HIVEMALL-243
   
   ## Checklist
   
   - [x] Did you apply source code formatter, i.e., `./bin/format_code.sh`, for your commit?
   - [ ] Did you run system tests on Hive (or Spark)?
   

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