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https://issues.apache.org/jira/browse/MAHOUT-1148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576711#comment-13576711
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Ying Liao commented on MAHOUT-1148:
-----------------------------------
I tried the new QRDecompose implementation in mahout. There is a big
improvement comparing with the old one. But it's still slower than the
implementation from org.apache.commons.math3.linear.QRDecomposition. Here is my
comparison.
Map input records: 2,827,622
num of Features = 60
Solve time with org.apache.mahout.math.QRDecomposition = 8,459,920
Solve time with org.apache.commons.math3.linear.QRDecomposition = 1,214,592
> QR Decomposition is too slow
> ----------------------------
>
> Key: MAHOUT-1148
> URL: https://issues.apache.org/jira/browse/MAHOUT-1148
> Project: Mahout
> Issue Type: Bug
> Reporter: Ted Dunning
>
> A user reported that QR decomposition is too slow. I coded up a replacement
> that can be 10x faster under certain cases and the new version is also tested.
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