Dmitriy Lyubimov created MAHOUT-1781:
----------------------------------------
Summary: Dense matrix view multiplication is 4x slower than
non-view one
Key: MAHOUT-1781
URL: https://issues.apache.org/jira/browse/MAHOUT-1781
Project: Mahout
Issue Type: Improvement
Affects Versions: 0.11.0
Reporter: Dmitriy Lyubimov
Assignee: Dmitriy Lyubimov
Priority: Critical
if mxA and mxB are two in-core DenseMatrix matrices, then
mxA(::,::) %*% mxB(::,::) takes 4x the time of mxA %*% mxB.
possibly an issue of dot products on VectorViews vs. DenseVectors.
dot product over DenseVectors seems to not to go through aggregate()
cost-optimized framework.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
