Hi,

Can anyone help me explain this:

`v = v.reshape(-1, 1)`

To reshape an 3D image → 2D image which its dimension will be (image.shape[0]*image.shape[1], image.shape[2])

Can you give a general formula because I have seen this so far but not this case. using -1 in reshape but I don’t understand the principles like retain the last dimension ( by -1) how about 1 in (-1,1)?