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WalkthroughThe changes update the union-find data structure to correct the weight update logic in its union operation and clarify its documentation. Additionally, a new test file for union-find is added and integrated into the test suite to verify the correctness of union operations, root identification, and cluster counting. Changes
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🧹 Nitpick comments (3)
src/model/common/union_find.jl (1)
61-71: Consider zeroing the absorbed root’s weight for safer downstream use
u.weights[r1]is updated correctly, but the weight stored inr2(now a non-root) is left untouched.
If any downstream logic ever inspectsweights[i]without first checkingisroot(u,i), the stale size may lead to subtle bugs (e.g. double counting cluster sizes).u.parents[r2] = r1 u.weights[r1] += u.weights[r2] + # Optional safety: clear the absorbed root’s weight + # so that only true roots carry meaningful sizes. + # This has zero algorithmic impact but prevents + # accidental misuse elsewhere. + # u.weights[r2] = 0This is a non-functional suggestion; feel free to skip if the invariant “weights are meaningful only for roots” is already well-documented and consistently honoured.
test/runtests.jl (1)
15-16: Guard against duplicate test inclusions
"checkpoint.jl"is added alongside the new"union_find.jl".
Ifcheckpoint.jlwas already in the list before this change, it will now run twice, lengthening CI time and potentially producing duplicate output.Consider de-duplicating:
filenames = unique([ "observable.jl", "classical.jl", "quantum.jl", "checkpoint.jl", "union_find.jl" ])test/union_find.jl (1)
18-22: Add a check on the absorbed root’s parent to tighten the regression testAfter the final
unify!, noder34(the former root of the {3,4} set) should now haveparents[r34] == r.
Verifying this guards against regressions where the parent pointer is not updated correctly.r = unify!(uf, 1, 3) @test r == SpinMonteCarlo.root!(uf, 2) == SpinMonteCarlo.root!(uf, 4) @test uf.weights[r] == 4 + @test uf.parents[r34] == r # ensure the old root now points to the new root @test uf.nclusters == 1
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src/model/common/union_find.jl(2 hunks)test/runtests.jl(1 hunks)test/union_find.jl(1 hunks)
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Summary
unify!docsunify!Testing
julia --project=. -e 'using Pkg; Pkg.test()'https://chatgpt.com/codex/tasks/task_e_684fa53e5fb883278235b3af6fdb0bb9
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