DB Tsai created SPARK-4611:
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Summary: 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
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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