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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-7921) Change includeFirst to dropLast in OneHotEncoder
Date Thu, 28 May 2015 19:11:22 GMT

     [ https://issues.apache.org/jira/browse/SPARK-7921?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-7921:
-----------------------------------

    Assignee: Xiangrui Meng  (was: Apache Spark)

> 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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