def model_params(model_name):
    """ Map Generator and Discriminator model name to parameter coefficients.

      Args:
        model_name (string): The name of the model corresponding to the dataset.

      Returns:
        A binary tuple value.
      """
    params_dict = {'g-mnist': (1, 28), 'g-fmnist': (1, 28), 'd-mnist': (1, 
        28), 'd-fmnist': (1, 28)}
    return params_dict[model_name]
