towhee.models.vis4mer.utils.power

towhee.models.vis4mer.utils.power(l, a, v=None)

Compute a^l and the scan sum_i a^i v_i :param l: power :type l: int :param a: (…, N, N) :type a: torch.tensor :param v: (…, N, L) :type v: torch.tensor