Wayne Zhang created SPARK-20619:
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Summary: StringIndexer supports multiple ways of label ordering
Key: SPARK-20619
URL: https://issues.apache.org/jira/browse/SPARK-20619
Project: Spark
Issue Type: Improvement
Components: ML
Affects Versions: 2.1.0
Reporter: Wayne Zhang
StringIndexer maps labels to numbers according to the descending order of label
frequency. Other types of ordering (e.g., alphabetical) may be needed in
feature ETL, for example, in one-hot encoding. Propose to support alphabetic
order, and ascending order of label frequency. For example, add a parameter
stringOrderType to control how string is ordered which supports four options:
- 'freq_desc': descending order by label frequency (most frequent label
assigned 0)
- 'freq_asc': ascending order by label frequency (least frequent label
assigned 0)
- 'alphabet_desc': descending alphabetical order
- 'alphabet_asc': ascending alphabetical order
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