Numpy Concatenate Multiple Arrays Arrays

I have many numpy arrays of shape (Ni,227,227,3), where Ni of each array is different. I want to join them and make array of shape (N1+N2+..+Nk,227,227,3) where k is the number of

Solution 1:

So, the main problem here was with the one of the arrays of shape (0,) instead of (0,227,227,3).

np.concatenate(alist,axis=0) works.