code: def toy_data(n_obs):
      
  
      """Random samples from Dentate Gyrus.
      """
      adata = dentategyrus()
      indices = np.random.choice(adata.n_obs, n_obs)
      adata = adata[indices]
      adata.obs_names = np.array(range(adata.n_obs), dtype='str')
      adata.var_names_make_unique()
      return adata
docs: Randomly samples from the Dentate Gyrus dataset.
  
      Arguments
      ---------
      n_obs: `int`
          Size of the sampled dataset
  
      Returns
      -------
      Returns `adata` object