Allow SparseArrays to catch lu(::WrappedSparseMatrix)
#51161
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Ping @vtjnash. |
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I haven't the slightest idea how this is designed currently, but I assume this is similar to your work on |
oscardssmith
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ViralBShah
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Sep 7, 2023
This is a follow-up to #51161. It introduces one level in the promotion pipeline which allows to call out-of-place versions of `cholesky` and `qr` for arguments whose `similar` copy yields a `SparseMatrixCSC`.
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Over the
AbstractMatrixrelaxation in v1.9, we missed a potential indirection for wrapped sparse matrices. Instead, by default, asimilarcopy is created (hence a sparse matrix) and thenlu!with a pivot argument is called. Such a method, however, does not exist in SparseArrays.jl, which means that thegeneric_lufact!method gets called, which is probably really bad performance-wise, due to heavy reading and writing into the sparse matrix. This PR introduces one more level at which SparseArrays.jl (and perhaps other external packages) may interfere and redirect to their own implementations, in-place or out-of-place.