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pythonで3つの行列A,B,Cの内積はA@B@C

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行列、A,Bの内積は

inner_product.py
import numpy as np
np.dot(A,B)

なので、ABCは

inner_product.py
np.dot(np.dot(A,B),C)

でもいいのですが、これだと少し、まどろっこしい。そこで、

inner_product.py
A @ B @ C

とすればスマート。次元さえ合っていれば、行列にかぎらず、ベクトルの内積でもOK.

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