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[WIP] Support Eigen::Map<Eigen::SparseMatrix> #782

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alecjacobson
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If completed would fix #781.

Phew, I learned a lot poking around, but I'm mostly just cribbing the original Eigen::SparseMatrix support. I have barely tested any of this. I will use this PR to add tests etc.

@wjakob
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wjakob commented Nov 14, 2024

Hi Alec, thank you very much for working on this, zero-copy sparse matrix passing will be useful. There were still some internal comments and questions inside the PR, so I am assuming that it is still in progress. Please let me know if/when you'd like me to do a review.

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[BUG]: scipy.sparse._csc.csc_matrix → Eigen::SparseMatrix appears to incur a copy
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