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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/05/18 23:06:02 UTC

[jira] [Assigned] (SPARK-7617) Word2VecModel fVector not normalized

     [ https://issues.apache.org/jira/browse/SPARK-7617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-7617:
-----------------------------------

    Assignee: Apache Spark

> Word2VecModel fVector not normalized
> ------------------------------------
>
>                 Key: SPARK-7617
>                 URL: https://issues.apache.org/jira/browse/SPARK-7617
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>    Affects Versions: 1.3.1
>            Reporter: Eric Li
>            Assignee: Apache Spark
>            Priority: Trivial
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> fVector is not divided by norm in findSynonyms. This will not affect the order of synonyms, since it is a constant. However, the calculated cosine distances will not be comparable across different words. 
> For example, 
> findSynonyms("sf", 1) return [("oakland", 0.2)]
> findSynonyms("dc", 1) return [("arlington", 0.3)]
> We cannot say compare the distances 0.2 with 0.3, since distances are not normalized. 



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