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Posted to issues@spark.apache.org by "Joseph K. Bradley (JIRA)" <ji...@apache.org> on 2016/11/18 20:31:58 UTC

[jira] [Updated] (SPARK-18334) What hashDistance should MinHash use?

     [ https://issues.apache.org/jira/browse/SPARK-18334?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joseph K. Bradley updated SPARK-18334:
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    Summary: What hashDistance should MinHash use?  (was: MinHash should use binary hash distance)

> What hashDistance should MinHash use?
> -------------------------------------
>
>                 Key: SPARK-18334
>                 URL: https://issues.apache.org/jira/browse/SPARK-18334
>             Project: Spark
>          Issue Type: Bug
>            Reporter: Yun Ni
>            Priority: Trivial
>
> MinHash currently is using the same `hashDistance` function as RandomProjection. This does not make sense for MinHash because the Jaccard distance of two sets is not relevant to the absolute distance of their hash buckets indices.
> This bug could affect accuracy of multi probing NN search for MinHash.



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