code: def grid_restack(all_vecs):
      """Stack layers with respect to the grid shape of positions.
  
      Given multiple sequences (lists) of batch x len x dim reshape this such
      that all positions are side by side.
  
      for example (for illustrative purposes):
  
      inputs: [1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]
      outputs: [1, 5, 9, 2, 6, 10, 3, 7, 11, 4, 8, 12]
  
      Args:
        all_vecs: list of sequences of batch x len x dim
  
      Returns:
        Array of batch x (length x num_items) x dim.
      """
      cat_output = []
      for pos in range(all_vecs[0].shape[1]):
          pos_vecs = [x[:, None, pos, :] for x in all_vecs]
          cat_output += pos_vecs
      x2 = jnp.concatenate(cat_output, 1)
      return x2
  
label_desc: Use image node_id 1 for calling a global function with example usage: grid_restack(all_vecs) and returns: x2