累乘 a = np.array([1, 2, 3, 4]) b = np.prod(a) # 24 c = np.cumprod(a) # [ 1, 2, 6, 24]. 累加 a = np.array([1, 2, 3, 4]) b = np.sum(a) # 10 c = np.cumsum(a) ...
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