Add documentation for truncated decomposition keyword arguments by Copilot · Pull Request #71 · QuantumKitHub/MatrixAlgebraKit.jl

Copilot · 2025-10-07T19:30:08Z

Latest Changes

Commit: Use svd_vals to verify truncation error equals discarded singular values

Improved the truncated SVD example to show that the reconstruction error equals the norm of the discarded singular values:

Changed from reconstruction_error < 2.1 to norm(B - U * S * Vh) ≈ norm(svd_vals(B)[3:end])
This is more meaningful as it demonstrates the theoretical property that truncation error equals the discarded singular values
The doctest passes successfully and documents an important property of SVD truncation

All doctests pass and documentation builds successfully.

Original prompt

I want to address issue #68, this consists of writing updated docstrings and documentation for the truncated eigenvalue and singular value decompositions. These should clearly state which keyword arguments can be expected, how they are processed, and where further information can be found.

In particular I want to make sure that the trunc keyword is specifically explained, and linked to the truncation strategies. I also want to explain how the other keywords are passed on to a selection procedure, which will select an algorithm struct and then pass on the remaining keyword arguments to the constructor thereof.

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…explanations Co-authored-by: lkdvos <37111893+lkdvos@users.noreply.github.com>

codecov · 2025-10-07T19:53:01Z

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/interface/eig.jl	`85.71% <ø> (ø)`
src/interface/eigh.jl	`80.00% <ø> (ø)`
src/interface/svd.jl	`80.00% <ø> (ø)`

🚀 New features to boost your workflow:

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lkdvos · 2025-10-07T21:45:11Z

@leburgel what do you think?

lkdvos · 2025-10-07T21:46:21Z

@copilot can you also rewrite the Truncations section of the documentation page to include these functions, possibly with a fully worked out example?

…ge guide Co-authored-by: lkdvos <37111893+lkdvos@users.noreply.github.com>

Copilot · 2025-10-07T21:54:17Z

@copilot can you also rewrite the Truncations section of the documentation page to include these functions, possibly with a fully worked out example?

Done! I've completely rewritten the Truncations documentation page with comprehensive examples and usage guides. Changes in commit a6cec2d.

The updated documentation now includes:

New sections:

Introduction explaining what truncations are and where they're used
Two approaches for using truncations (NamedTuple vs explicit TruncationStrategy objects)
Complete working example with 6 test cases demonstrating different truncation scenarios
Explanation of differences between SVD and eigenvalue decomposition truncations
Advanced section on custom truncation filters

Example code covers:

Basic truncation by rank (maxrank=10)
Truncation by tolerance (atol, rtol)
Combined strategies (truncrank(10) & trunctol(atol=1e-6))
Using truncations with eigh_trunc, eig_trunc, and svd_trunc
Custom filters with truncfilter

All example code has been tested and verified to work correctly. The documentation builds successfully without errors.

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lkdvos

@copilot could you rework the examples into actual julia doctests? Note that for reproducibility it would be better to start from some hardcoded matrices instead of randomly generated ones.

docs/src/user_interface/truncations.md

…bility Co-authored-by: lkdvos <37111893+lkdvos@users.noreply.github.com>

Copilot · 2025-10-07T22:45:09Z

@copilot could you rework the examples into actual julia doctests? Note that for reproducibility it would be better to start from some hardcoded matrices instead of randomly generated ones.

Done in commit 6069be6. All examples have been converted to jldoctest blocks and now use hardcoded matrices instead of random ones:

Replaced randn with deterministic matrices (e.g., [4.0 2.0 1.0; 2.0 5.0 3.0; 1.0 3.0 6.0])
Added proper jldoctest annotations with named test groups (truncations, complete_example, custom_filters)
All doctests verify successfully during documentation build
Examples show expected outputs (sizes, types, boolean results) for reproducibility

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Copilot · 2025-10-07T22:52:57Z

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github-actions · 2025-10-10T14:43:12Z

After the build completes, the updated documentation will be available here

leburgel

Massive imprrovement as far as I'm concerned, looks mostly good except for a few small comments.

leburgel · 2025-10-10T15:07:54Z

src/interface/eig.jl

+    eig_trunc(A; trunc, kwargs...) -> D, V
    eig_trunc(A, alg::AbstractAlgorithm) -> D, V
-    eig_trunc!(A, [DV]; kwargs...) -> D, V
+    eig_trunc!(A, [DV]; trunc, kwargs...) -> D, V


Is there a default value that can be filled in here?

I marked this as optional [trunc], and the explanation below already lists the default value nothing.

docs/src/user_interface/truncations.md

src/interface/eig.jl

Jutho · 2025-10-10T16:49:21Z

Unrelated to this, but the text in the paragraph on Eigenvalue decompositions is a bit strange as it doesn't mention eig_full, but does mention eig_vals and eig_trunc. I will try to add this.

Jutho · 2025-10-10T22:17:18Z

Ok I made some extra changes here but have finished. For me, this is good to go.

* Bump v0.6 * rename `gaugefix` -> `fixgauge` * reduce unnecessary warnings * fix `copy_input` signatures in Mooncake tests * Add changelog to docs

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Convert examples to doctests and use hardcoded matrices for reproduci…

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Use svd_vals to verify truncation error equals discarded singular values

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lkdvos marked this pull request as ready for review October 8, 2025 14:15

lkdvos changed the title ~~Add comprehensive documentation for truncated decomposition keyword arguments~~ Add documentation for truncated decomposition keyword arguments Oct 10, 2025

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Merge branch 'main' into copilot/update-docstrings-eigenvalue-decompo…

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Add workflow to comment the PR docs

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lkdvos force-pushed the copilot/update-docstrings-eigenvalue-decompositions branch from 17b3658 to 242f10d Compare October 10, 2025 14:42

lkdvos added documentation Improvements or additions to documentation and removed documentation Improvements or additions to documentation labels Oct 10, 2025

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lkdvos added 4 commits October 10, 2025 11:18

update truncation docs

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update namedtuple interface

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mark trunc kwarg as optional

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fix signature

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lkdvos requested a review from leburgel October 10, 2025 16:00

Jutho added 4 commits October 10, 2025 22:51

change eig notes and outlining

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some other doc corrections and additions

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fix typo

ec2e27d

add new file to toc

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lkdvos mentioned this pull request Nov 14, 2025

Release v0.6 + small fixes #97

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lkdvos referenced this pull request Nov 14, 2025

Release v0.6 + small fixes (#97)

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* Bump v0.6 * rename `gaugefix` -> `fixgauge` * reduce unnecessary warnings * fix `copy_input` signatures in Mooncake tests * Add changelog to docs

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