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From "Xiangrui Meng (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-4611) Implement the efficient vector norm
Date Tue, 02 Dec 2014 03:42:12 GMT

     [ https://issues.apache.org/jira/browse/SPARK-4611?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiangrui Meng resolved SPARK-4611.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 1.2.0

Issue resolved by pull request 3462
[https://github.com/apache/spark/pull/3462]

> Implement the efficient vector norm
> -----------------------------------
>
>                 Key: SPARK-4611
>                 URL: https://issues.apache.org/jira/browse/SPARK-4611
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: DB Tsai
>            Assignee: DB Tsai
>             Fix For: 1.2.0
>
>
> The vector norm in breeze is implemented by `activeIterator` which is known to be very
slow. In this PR, an efficient vector norm is implemented, and with this API, `Normalizer`
has huge performance gain.
> Here is the benchmark against mnist8m dataset.
> Before
> DenseVector: 68.25secs
> SparseVector: 17.01secs
> With this PR
> DenseVector: 12.71secs
> SparseVector: 2.73secs



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