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https://issues.apache.org/jira/browse/SPARK-5419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14292898#comment-14292898
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Apache Spark commented on SPARK-5419:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/4217
> Fix the logic in Vectors.sqdist
> -------------------------------
>
> Key: SPARK-5419
> URL: https://issues.apache.org/jira/browse/SPARK-5419
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: Xiangrui Meng
> Assignee: Liang-Chi Hsieh
>
> The current implementation of sqdist tries to convert sparse vectors to dense
> if they are close to dense. This is not efficient because we need to allocate
> temp arrays. We should simply implement sqdist without allocating new memory.
> The current implementation also contains a bug on deciding whether to convert
> a sparse vector to dense.
> {code}
> v1.indices.length / v1.size < 0.5
> {code}
> which should get removed with the changes described above.
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