multi_dot
可以用於多個矩陣的乘法,而且會根據最少的計算量進行優化。
矩陣相乘的計算量示例:A(10,100) B(100,5)C(5,50)
cost((AB)C) = 10x100x5 + 10x5x50 = 5000 + 2500 = 7500
cost(A(BC)) = 10x100x50 + 100x5x50 = 50000 + 25000 = 75000
用法:
np.linalg.multi_dot([A, B, C, D])
參考:https://numpy.org/doc/1.18/reference/generated/numpy.linalg.multi_dot.html