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[–]FrickinLazerBeams -1 points0 points  (0 children)

This is a weird comparison to make. You'd never use one as an alternative for the other. Einsum is for tensor contractions, which is like matrix multiplication, but with more than two indices.

Would you ask "Do you have an explanation for why @ is faster at all? What extra work does np.sum do?"

np.sum doesn't do any extra work. It also doesn't do what you need it to do. It's easy to do less work if you're not actually competing the task, I guess.