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Re:Discovering faster matrix multiplication algorithms with ... by vlovich123 on Friday October 07, 2022 @02:57PM (#33125478)
There's a better explanation here: https://fgiesen.wordpress.com/2022/10/06/on-alphatensors-new...

This is for matrix multiplication where elements are themselves 4x4 matrices. So yes, indeed this is about multiplying many many 4x4 matrices where N is the size of the outer matrix.

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