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https://issues.apache.org/jira/browse/SPARK-7143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-7143.
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Resolution: Won't Fix
> Add BM25 Estimator
> ------------------
>
> Key: SPARK-7143
> URL: https://issues.apache.org/jira/browse/SPARK-7143
> Project: Spark
> Issue Type: New Feature
> Components: ML
> Reporter: Liang-Chi Hsieh
>
> [BM25|http://en.wikipedia.org/wiki/Okapi_BM25] is a retrieval function used
> to rank documents. It is commonly used in IR tasks and can be parallel. This
> issue is proposed to add it into Spark ML.
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