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Can anyone weigh in on the state of the JS / TS ecosystem for linear algebra and matrix operations, and how that stacks up against the Python ecosystem?

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There's Python/Julia/R, then below there is 50ft of crap and then there is JS/npm ecosystem for data science. Arguably this is also true for a lot of different languages.

Tried to run a Gaussian mixture model in JS. Topped out at 8 dimensions which it could run in minutes. Any more than that would crash. Python (sklearn) ran 200 dimensions in less than a second.

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