code: def split_and_save_datasets(X, Y, paths):
      
      shuffled_idxs = np.random.permutation(np.arange(len(X)))
  
      for i in range(len(paths)):
          # Take every len(paths) item, starting at i.
          # len(paths) is 3, so this would be [0::3], [1::3], [2::3]
          X_i = X[shuffled_idxs[i::len(paths)]]
          Y_i = Y[shuffled_idxs[i::len(paths)]]
          np.savez(paths[i], X=X_i, Y=Y_i)
docs: Shuffle X and Y into n / len(paths) datasets, and save them
      to disk at the locations provided in paths.