Sebastian Schelter created MAHOUT-1508:
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Summary: SparseMatrix assign has huge performance problems
Key: MAHOUT-1508
URL: https://issues.apache.org/jira/browse/MAHOUT-1508
Project: Mahout
Issue Type: Bug
Components: Math
Reporter: Sebastian Schelter
Priority: Blocker
Fix For: 1.0
I'm currently working with the new Scala DSL and running into a problem with
SparseMatrix and SparseRowMatrix.
The problem is that they don't implement a specialized assign(Matrix other,
DoubleDoubleFunction f) function, but use the implementation from
AbstractMatrix which loops through all (!) possible entries.
We have to fix this asap.
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