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https://issues.apache.org/jira/browse/SPARK-7921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14563500#comment-14563500
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Apache Spark commented on SPARK-7921:
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User 'mengxr' has created a pull request for this issue:
https://github.com/apache/spark/pull/6466
> Change includeFirst to dropLast in OneHotEncoder
> ------------------------------------------------
>
> Key: SPARK-7921
> URL: https://issues.apache.org/jira/browse/SPARK-7921
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 1.4.0
> Reporter: Xiangrui Meng
> Assignee: Xiangrui Meng
>
> Change includeFirst to dropLast and leave the default to true. There are
> couple benefits:
> a. consistent with other tutorials of one-hot encoding (or dummy coding)
> (e.g., http://www.ats.ucla.edu/stat/mult_pkg/faq/general/dummy.htm)
> b. keep the indices unmodified in the output vector. If we drop the first,
> all indices will be shifted by 1.
> c. If users use StringIndex, the last element is the least frequent one.
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