Help! A question abou vector b

why b2 is not 1./m*dZ2

The point is that everything in the left column is dealing with the case of a single input sample and everything in the right column is the general case of treating m samples at the same time. So another way to say it is that it is being multiplied by \frac {1}{m}, but m = 1. :nerd_face:

As I recall, Prof Ng is clear about that in the corresponding lecture. Please listen to that section again with the above description in mind and I’ll bet you catch the point at which he explains that.

1 Like