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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 04:22:13 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 ]
Hyukjin Kwon updated SPARK-18334:
---------------------------------
Labels: bulk-closed (was: )
> 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: Minor
> Labels: bulk-closed
>
> 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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