Narine Kokhlikyan created SPARK-13295:
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Summary: ML/MLLIB: AFTSurvivalRegression: Improve AFTAggregator -
Avoid creating new instances of arrays/vectors for each record
Key: SPARK-13295
URL: https://issues.apache.org/jira/browse/SPARK-13295
Project: Spark
Issue Type: Improvement
Components: ML, MLlib
Reporter: Narine Kokhlikyan
As also mentioned/marked by TODO in AFTAggregator.AFTAggregator.add(data:
AFTPoint) a new array is being created for intercept value and it is being
concatenated
with another array with contains the betas, the resulted Array is being
converted into a Dense vector which in it's turn is being converted into breeze
vector.
This is expensive and not necessarily beautiful.
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