Add flux-canceling randn(sector, inds) constructors#230
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## main #230 +/- ##
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+ Coverage 77.88% 78.02% +0.14%
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Extend the map-shaped `(codomain, domain)` constructors to `ones` and `fill` alongside `zeros`, routing them through `TensorAlgebra.ones_map`/`fill_map`, and cover them in the `Index`-level flux-canceling forms in `ITensorBaseGradedArraysExt`.
Add the `randn(rng, axes...)`/`rand(rng, axes...)` signatures (default element type) that `Base` supports, covering the flat, split `(codomain, domain)`, and flux `(sector, ...)` forms, so the ITensorBase rng-first surface matches `Base` and the GradedArrays backend.
mtfishman
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randn(sector, inds) constructorsrandn(sector, inds) constructors
mtfishman
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July 24, 2026 20:50
mtfishman
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July 24, 2026 20:50
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Summary
Adds flux-canceling constructors
randn/rand/zeros/ones/fill(c, codomain[, domain]) at theIndexlevel, so anITensorover graded (block-sparse) indices can be built carrying a nonzero total chargec. They mint a fresh auxiliaryIndexcarryingcand forward to the map-shaped split constructor, appending the aux to the domain dangling last so the physical indices fuse toc. The sector may be a bareTensorKitSectors.Sectoror aSectorRange. These live in a newITensorBaseGradedArraysExt, since ITensorBase does not depend on the sector types.Filling out the constructor surface these build on, this also adds the split
(codomain, domain)forms ofonesandfillto ITensorBase core (alongside the existingzeros), and letsrandn/randtake a leadingrngwithout an explicit element type (matchingBase.randn(rng, dims...)) across the flat, split, and flux forms.Builds on ITensor/GradedArrays.jl#220 and ITensor/TensorAlgebra.jl#216.