How is dot product possible?

Course Q&A Machine Learning Specialization Advanced Learning Algorithms
1

I did not understand how the dot product of w and a_in is possible because they both seem like 2x1 matrix.

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2

Hello @Ashish_Ganesh,

If we check the slide more carefully, they are both 1D array of shape (2, ) instead of 2D array of shape (2, 1). Therefore, the first rule in np.dot applies!

Cheers,
Raymond

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