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Fix QR based fitting #559

Merged
merged 4 commits into from
Nov 20, 2024
Merged

Fix QR based fitting #559

merged 4 commits into from
Nov 20, 2024

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andreasnoack
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@andreasnoack andreasnoack commented May 7, 2024

Avoid erroring out for low rank design matrices when dropcollinear=false.
Avoid unnecessary triangular solves. Avoid indexing in the Q.
Avoid slicing R matrix in a way that triggers a minimum norm solution.
Remove unnecessary temporaries.

Fixes #558

I removed the white space so please review with https://github.com/JuliaStats/GLM.jl/pull/559/files?w=1

@andreasnoack andreasnoack requested a review from mousum-github May 7, 2024 11:15
@andreasnoack andreasnoack force-pushed the an/norank branch 2 times, most recently from 33d1584 to 35c3e94 Compare May 7, 2024 11:56
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codecov bot commented May 7, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.95%. Comparing base (3cfea07) to head (054f910).

Additional details and impacted files
@@            Coverage Diff             @@
##           master     #559      +/-   ##
==========================================
- Coverage   90.11%   89.95%   -0.17%     
==========================================
  Files           8        8              
  Lines        1123     1105      -18     
==========================================
- Hits         1012      994      -18     
  Misses        111      111              

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@andreasnoack andreasnoack requested review from devmotion and removed request for mousum-github May 17, 2024 09:30
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end
p.delbeta[1:rnk] = R \ (p.qr.Q'*r̃)[1:rnk]
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Maybe

Suggested change
p.delbeta[1:rnk] = R \ (p.qr.Q'*r̃)[1:rnk]
mul!(view(p.delbeta, 1:rnk), view(p.qr.Q, :, 1:rnk)', r̃)
ldiv!(R, view(p.delbeta, 1:rnk))

?

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We can't make a view into Q, see above, but we can make a view into the result.

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I've addressed your comments

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end
p.delbeta[1:rnk] = R \ (p.qr.Q'*r̃)[1:rnk]
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We can't make a view into Q, see above, but we can make a view into the result.

@andreasnoack andreasnoack force-pushed the an/norank branch 4 times, most recently from 37249f5 to 2b61e90 Compare November 5, 2024 16:13
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@devmotion I finally found a way to download the test dataset reliably so this one should be good to go.

Avoid erroring out for low rank design matrices when dropcollinear=false.
Avoid unnecessary triangular solves. Avoid indexing in the Q.
Avoid slicing R matrix in a way that triggers a minimum norm solution.
Remove unnecessary temporaries.
@andreasnoack andreasnoack merged commit f6f4f70 into master Nov 20, 2024
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@andreasnoack andreasnoack deleted the an/norank branch November 20, 2024 10:24
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GLM fails to match certified values for the Filip dataset
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