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Posted to dev@mahout.apache.org by "Dmitriy Lyubimov (JIRA)" <ji...@apache.org> on 2015/06/03 01:56:49 UTC

[jira] [Created] (MAHOUT-1730) new mutable transposition view for in-core matrices.

Dmitriy Lyubimov created MAHOUT-1730:
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             Summary: new mutable transposition view for in-core matrices.
                 Key: MAHOUT-1730
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1730
             Project: Mahout
          Issue Type: Improvement
            Reporter: Dmitriy Lyubimov
            Assignee: Dmitriy Lyubimov
             Fix For: 0.10.2


in-core mxA.t rewrite with mostly two goals in mind: 

(1) enable mutability , e.g. 

for (col <- mxA.t) col := k

(2) translate matrix structural flavor for optimizers correctly. i.e. new SparseRowMatrix.t  carries on as column-major structure.

Also it does unwrapping automatically, i.e. mxA.t.t eq mxA is true.

there are other smaller goals hit in this rewrite, e.g. various efficient assigns. 





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