Dan Filimon created MAHOUT-1190:
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Summary: SequentialAccessSparseVector function assignment is very
slow
Key: MAHOUT-1190
URL: https://issues.apache.org/jira/browse/MAHOUT-1190
Project: Mahout
Issue Type: Bug
Reporter: Dan Filimon
Currently when calling .assign() on a SASV with another vector and a custom
function, it will iterate through it and assign every single entry while also
referring it by index.
This makes the process *hugely* expensive. (on a run of BallKMeans on the 20
newsgroups data set, profiling reveals that 92% of the runtime was spent
updating assigning the vectors).
Here's a prototype patch:
https://github.com/dfilimon/mahout/commit/63998d82bb750150a6ae09052dadf6c326c62d3d
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