flatten() and unflatten() in PyTorch
flatten() can remove zero or more dimensions from a 0D or more D tensor as shown below: *Memos: flatten() can be called both from torch and a tensor. The 2nd argument(int) with torch or the 1st argument(int) with a tensor is start_dim which is the 1st dimension. The 3rd argument(int) with torch or the 2nd…