[jira] [Commented] (SPARK-18454) Changes to improve Nearest Neighbor Search for LSH

["Mingjie Tang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-18454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15893087#comment-15893087 ] 

Mingjie Tang commented on SPARK-18454:
--------------------------------------

[~yunn] the current multi-probe NNS can be improved without building index. 

 



> Changes to improve Nearest Neighbor Search for LSH
> --------------------------------------------------
>
>                 Key: SPARK-18454
>                 URL: https://issues.apache.org/jira/browse/SPARK-18454
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>            Reporter: Yun Ni
>
> We all agree to do the following improvement to Multi-Probe NN Search:
> (1) Use approxQuantile to get the {{hashDistance}} threshold instead of doing full sort on the whole dataset
> Currently we are still discussing the following:
> (1) What {{hashDistance}} (or Probing Sequence) we should use for {{MinHash}}
> (2) What are the issues and how we should change the current Nearest Neighbor implementation



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