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Trying to speed up sparse matrix compression usage #40

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@daharoni daharoni commented Dec 15, 2025 •
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Follows #38

Summary

Without making any algorithm changes, find places to speed up sparse matrix code

Changes

  • solver.py
    • Use row-scaling: M.T @ W^2 @ M == (W @ M).T @ (W @ M). So we now do Mw = M.multiply(w[:, None]) and then P = Mw.T @ Mw. ~12% speed up on short profiling test.

@daharoni daharoni linked an issue Dec 15, 2025 that may be closed by this pull request
scipy/sparse/_compressed.py is where a lot of compute time goes #39
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scipy/sparse/_compressed.py is where a lot of compute time goes

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