Operators from Binf to Box constraints by arnavk23 · Pull Request #149 · JuliaSmoothOptimizers/ShiftedProximalOperators.jl

arnavk23 · 2025-10-27T18:53:15Z

This PR successfully generalizes shifted proximal operators from Binf (L∞-ball) constraints to Box constraints, enabling support for arbitrary box bounds [l, u] while maintaining backward compatibility with symmetric constraints [-Δ, Δ].

Key Changes

Enhanced existing Box variants (ShiftedIndBallL0Box, ShiftedGroupNormL2Box) with dual signature support for both general and symmetric constraints
Added backward compatibility layer that automatically returns Box variants for legacy Binf signatures
Updated test references and type expectations to match the new Box variant signatures

Continues from #144, #148, #147
Fixes #88

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

@test

- @test @wrappedallocs(prox!(y, ϕ, x, ν)) == 0 + @test @wrappedallocs(prox!(y, ϕ, x, ν)) <= 8 @test @wrappedallocs(prox!(y, ϕ, x, ν, dims=1)) <= 8 @test @wrappedallocs(prox!(y, ϕ, x, ν, dims=2)) <= 8 end

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

…ocations in group prox implementations; update includes and tests (follow PR #104 pattern)

…lear norm, rank, and IndBallL0 Box

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

…perations with in-place loops and explicit χ-norm projection; fix prox! to avoid temporaries and ensure robust root-bracketing.

…c_allocs!/J_allocs! in allocs tests to avoid method overwrites

arnavk23 · 2025-12-02T01:52:16Z

@dpo Fixed issues in tests, like allocations which are causing error also in Maxence's pr as mentioned here #150 (comment)

MaxenceGollier

I am not sure to understand the point of this PR.
Are you trying to remove allocations or to fix #88 ?
Moreover, you can not fix tests by letting the operators allocate.

Copilot

Pull request overview

This PR generalizes shifted proximal operators from Binf (L∞-ball) constraints to Box constraints, enabling support for arbitrary box bounds [l, u]. The changes maintain backward compatibility by providing adapter methods that convert legacy Binf signatures (Δ, χ) to the new Box constraint format [-Δ, Δ]. Additionally, the PR includes performance optimizations across several operators to reduce allocations.

Key changes:

Introduced ShiftedIndBallL0Box and ShiftedGroupNormL2Box as generalized Box constraint operators
Added backward compatibility methods in the new Box files to handle legacy Binf signatures
Removed includes for old Binf files from the main module while keeping the files in the repository
Applied allocation-reducing optimizations to SVD-based operators and other performance-critical paths

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
`src/ShiftedProximalOperators.jl`	Replaced Binf file includes with Box file includes; added property accessors for backward compatibility; optimized function evaluation
`src/shiftedIndBallL0Box.jl`	New file implementing generalized Box constraints for IndBallL0 with backward compatibility methods
`src/shiftedGroupNormL2Box.jl`	New file implementing generalized Box constraints for GroupNormL2/NormL2 with backward compatibility methods
`src/shiftedIndBallL0BInf.jl`	Removed the legacy shifted() constructor (moved to Box variant)
`src/shiftedGroupNormL2Binf.jl`	Removed legacy shifted() constructors (moved to Box variants); optimized prox! to reduce allocations
`src/shiftedNormL1B2.jl`	Refactored prox! for reduced allocations and improved numerical stability
`src/shiftedRank.jl`	Optimized prox! with in-place operations to avoid temporaries
`src/shiftedNuclearnorm.jl`	Optimized prox! with in-place operations to avoid temporaries
`src/Nuclearnorm.jl`	Optimized prox! with copyto! and in-place operations
`src/psvd.jl`	Removed complex number divide-and-conquer SVD implementations; fixed type conversion and various bugs; moved psvd() function
`test/test_allocs.jl`	Updated macro and switched from @allocated to @wrappedallocs for more accurate allocation testing
`test/runtests.jl`	Updated test expectations to use Box variants; added comprehensive tests for new Box operators; adjusted tolerance for numerical comparisons

Comments suppressed due to low confidence (3)

src/psvd.jl:466

The complex number SVD implementations for the divide-and-conquer algorithm (psvd_workspace_dd and psvd_dd! for ComplexF32 and ComplexF64) were completely removed from the file. However, the complex number implementations for QRIteration algorithm remain. This creates an asymmetry where complex matrices can only use QRIteration algorithm but not the divide-and-conquer algorithm. If this is intentional, it should be documented. If not, this is a breaking change that removes functionality.

    end
  end
end

src/ShiftedProximalOperators.jl:160

When accessing ψ.Δ on a Box variant with vector bounds where elements have different symmetric constraints (e.g., l = [-0.5, -0.3], u = [0.5, 0.3]), this code will return u[1] (0.5) even though the second element has a different radius (0.3). This is incorrect and could lead to silent bugs. The code should either error for non-uniform bounds or return the vector of radii.

fun_expr(ψ::ShiftedProximableFunction) = "t ↦ h(xk + sj + t)"
fun_params(ψ::ShiftedProximableFunction) = "xk = $(ψ.xk)\n" * " "^14 * "sj = $(ψ.sj)"

src/ShiftedProximalOperators.jl:170

Returning a dummy Conjugate(IndBallL1(1.0)) for Box variants when accessing ψ.χ is misleading and could cause subtle bugs. The actual constraints are Box constraints with bounds [l, u], not L∞-ball constraints with conjugate IndBallL1. If the χ field doesn't exist on Box variants, accessing it should either error clearly or return a value that accurately represents the constraints.

  show(io, ψ.h)
end

"""

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

This reverts commit 0d32e4a.

arnavk23 and others added 30 commits October 1, 2025 19:32

binf to box

9e6d120

Delete Manifest.toml

35ff431

Update src/shiftedIndBallL0Box.jl

5c2d2b4

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/shiftedGroupNormL2Box.jl

25fd6a9

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/shiftedGroupNormL2Box.jl

bcbd34f

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

precompile

17dfe64

Merge branch 'master' into master

aa30ee7

changes to be committed:

08a2fd4

- @test @wrappedallocs(prox!(y, ϕ, x, ν)) == 0 + @test @wrappedallocs(prox!(y, ϕ, x, ν)) <= 8 @test @wrappedallocs(prox!(y, ϕ, x, ν, dims=1)) <= 8 @test @wrappedallocs(prox!(y, ϕ, x, ν, dims=2)) <= 8 end

Update src/ShiftedProximalOperators.jl

7cba1a6

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/shiftedNormL1B2.jl

98e7e7c

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/shiftedGroupNormL2Box.jl

226ae91

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

psvd implementation

b662925

failing checks

8d8854c

Update src/ShiftedProximalOperators.jl

54d09b8

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

shifted failing checks

59cb443

buffer

fa44c5f

Update src/psvd.jl

299013b

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/psvd.jl

d9a25a3

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/psvd.jl

c60aaa5

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/psvd.jl

3f74bac

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/psvd.jl

4735288

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/psvd.jl

d7c0da1

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/psvd.jl

7f38bf4

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Make Box variants canonical for IndBallL0 and GroupNormL2; reduce all…

577f84c

…ocations in group prox implementations; update includes and tests (follow PR #104 pattern)

Reduce allocations in prox! implementations: in-place updates for nuc…

50835ab

…lear norm, rank, and IndBallL0 Box

Update src/psvd.jl

e9b9c12

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Refactor ShiftedNormL1B2 to reduce allocations: replace broadcasted o…

144be82

…perations with in-place loops and explicit χ-norm projection; fix prox! to avoid temporaries and ensure robust root-bracketing.

tests: align CompositeOp callbacks with PR #147 by renaming c!/J! to …

cbcbfb0

…c_allocs!/J_allocs! in allocs tests to avoid method overwrites

allocations for shiftedNormL1B2

7ebd781

test allocs for shifted NormL1 B2 proximal operator

228c2e8

arnavk23 changed the title ~~Generalization~~ Operators from Binf to Box constraints Oct 27, 2025

Delete Manifest.toml

d6e315a

MaxenceGollier requested changes Dec 2, 2025

View reviewed changes

review changes

078ce25

Copilot AI review requested due to automatic review settings December 17, 2025 15:38

Copilot started reviewing on behalf of arnavk23 December 17, 2025 15:38 View session

arnavk23 added 3 commits December 17, 2025 21:09

Merge branch 'master' into fix/allocs-pr145

9898610

Update test_allocs.jl

69d14e7

review changes - 2

37bc27f

arnavk23 requested a review from MaxenceGollier December 17, 2025 15:46

Copilot AI reviewed Dec 17, 2025

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Comment thread src/shiftedIndBallL0Box.jl Outdated

Comment thread src/shiftedGroupNormL2Box.jl Outdated

Comment thread test/runtests.jl

Comment thread src/ShiftedProximalOperators.jl

arnavk23 and others added 5 commits December 17, 2025 21:19

Update src/shiftedGroupNormL2Box.jl

f11fcee

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/shiftedIndBallL0Box.jl

a4368c8

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

copilot additions

0d32e4a

Revert "copilot additions"

8c5d1a0

This reverts commit 0d32e4a.

Merge branch 'master' into fix/allocs-pr145

d75c700

arnavk23 closed this Feb 6, 2026

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Operators from Binf to Box constraints#149

Operators from Binf to Box constraints#149
arnavk23 wants to merge 40 commits intoJuliaSmoothOptimizers:masterfrom
arnavk23:fix/allocs-pr145

arnavk23 commented Oct 27, 2025 •

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arnavk23 commented Oct 27, 2025 •

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