Consider 3D tensor of T(w x h x d).
The goal is to create a tensor of R(w x h x K) where K = d x k by tiling along 3rd dimension in a unique way.
The tensor should repeat each slice in 3rd dimension k times, meaning :
T[:,:,0]=R[:,:,0:k] and T[:,:,1]=R[:,:,k:2*k]
There's a subtle difference with standard tiling which gives T[:,:,0]=R[:,:,::k]
, repeats at every kth in 3rd dimension.