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Posted to issues@flink.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2023/03/07 03:21:00 UTC

[jira] [Updated] (FLINK-31189) Allow special handle of less frequent values in StringIndexer

     [ https://issues.apache.org/jira/browse/FLINK-31189?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated FLINK-31189:
-----------------------------------
    Labels: pull-request-available  (was: )

> Allow special handle of less frequent values in StringIndexer
> -------------------------------------------------------------
>
>                 Key: FLINK-31189
>                 URL: https://issues.apache.org/jira/browse/FLINK-31189
>             Project: Flink
>          Issue Type: Improvement
>          Components: Library / Machine Learning
>            Reporter: Fan Hong
>            Priority: Major
>              Labels: pull-request-available
>
> Real-world datasets often contain categorical features with millions of distinct values, some of which may only appear a few times. To maximize the performance of certain algorithms, it is important to treat these less frequent values properly. A popular approach is to put them to a special index, as is done in sklearn's OneHotEncoder [1].
>  
> [1] https://scikit-learn.org/stable/modules/generated/sklearn.preprocessing.OneHotEncoder.html



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