code: def create_grid(x):
      N = x.shape[0]
      z = np.zeros((N, N, 3))
      z[:, :, 0] = x.reshape(-1, 1)
      z[:, :, 1] = x
      fast_grid = z.reshape(N * N, 3)
      return fast_grid
  
label_desc: Use image node_id 1 for calling a global function with example usage: create_grid(x) and returns: fast_grid