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https://issues.apache.org/jira/browse/HIVEMALL-233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16746411#comment-16746411
 ] 

ASF GitHub Bot commented on HIVEMALL-233:
-----------------------------------------

myui commented on pull request #178: [HIVEMALL-233] RandomForest regressor 
accepts sparse vector input
URL: https://github.com/apache/incubator-hivemall/pull/178#discussion_r249087536
 
 

 ##########
 File path: 
core/src/main/java/hivemall/utils/collections/lists/DoubleArrayList.java
 ##########
 @@ -70,7 +70,7 @@ public DoubleArrayList add(@Nonnull double[] values) {
     private void expand(int max) {
         while (data.length < max) {
             final int len = data.length;
-            double[] newArray = new double[len * 2];
+            double[] newArray = new double[(len + 1) * 2];
 
 Review comment:
   why this change has been made?
 
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> RandomForest regressor accepts sparse vector input
> --------------------------------------------------
>
>                 Key: HIVEMALL-233
>                 URL: https://issues.apache.org/jira/browse/HIVEMALL-233
>             Project: Hivemall
>          Issue Type: Improvement
>            Reporter: Takuya Kitazawa
>            Assignee: Takuya Kitazawa
>            Priority: Major
>
> While HIVEMALL-75 has enabled RandomForestClassifier to accept sparse vector 
> as an input, some crucial code in the classifier is not properly implemented 
> in its regressor counterpart; input feature vector is processed differently 
> by regressor and classifier.
> This ticket follows up to HIVEMALL-75 so that the regressor behaves similarly 
> to the classifier.



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