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update: speed up func sparse_mutual_reachability 20+ times #257

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update: speed up func sparse_mutual_reachability 20+ times #257

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codingafuture
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Warn: Need to change pure python code to pyx code.

@lmcinnes
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I presume this is a work in progress? I certainly look forward to the final results...

@codingafuture
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I presume this is a work in progress? I certainly look forward to the final results...

Yes, I am very sure about that, i had tested it for several times.
I think the reason why old version is very slow is that, it runs huge loops to iterate the entries in sparse matrix.
old version:
image

my version:
image

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@codingafuture @lmcinnes