python - Numpy and dot products of multiple vector pairs: how can it be done? -


i want dot product of n vector pairs (a_vec[i, :], b_vec[i, :]).

a_vec has shape [n, 3], bvec has same shape (n 3d vectors).

i know can done in cycle via numpy.dot function. cannot done somehow simpler , faster?

np.einsum it:

np.einsum('ij,ij->i', a_vec, b_vec)

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