[MAHOUT-1508] Performance problems with sparse matrices

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 0.10.0
• Component/s: classic
• Assignee: Sebastian Schelter
• Reporter: Sebastian Schelter
• Created: 11/Apr/14 06:01
• Updated: 31/Jan/24 22:16
• Resolved: 12/Apr/14 11:53

Description

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.