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https://issues.apache.org/jira/browse/SPARK-8314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14582629#comment-14582629
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Apache Spark commented on SPARK-8314:
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User 'rogermenezes' has created a pull request for this issue:
https://github.com/apache/spark/pull/6768
> improvement in performance of MLUtils.appendBias
> ------------------------------------------------
>
> Key: SPARK-8314
> URL: https://issues.apache.org/jira/browse/SPARK-8314
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 1.4.0
> Reporter: Roger Menezes
> Fix For: 1.5.0
>
>
> MLUtils.appendBias method is heavily used in creating intercepts for linear
> models. This method uses Breeze's vector concatenation which is very slow
> compared to the plain System.arrayCopy. This improvement is to change the
> implementation to use System.arrayCopy.
> We saw the following performance improvements after the change:
> Benchmark with mnist dataset for 50 times:
> MLUtils.appendBias (SparseVector Before): 47320 ms
> MLUtils.appendBias (SparseVector After): 1935 ms
> MLUtils.appendBias (DenseVector Before): 5340 ms
> MLUtils.appendBias (DenseVector After): 4080 ms
> This is almost a 24 times performance boost for SparseVectors.
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