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