How to use the asteroid.filterbanks.make_enc_dec function in asteroid

def make_model_and_optimizer(conf):
    """ Function to define the model and optimizer for a config dictionary.
    Args:
        conf: Dictionary containing the output of hierachical argparse.
    Returns:
        model, optimizer.
    The main goal of this function is to make reloading for resuming
    and evaluation very simple.
    """
    # Define building blocks for local model
    stft, istft = make_enc_dec('stft', **conf['filterbank'])
    # Because we concatenate (re, im, mag) as input and compute a complex mask.
    if conf['main_args']['is_complex']:
        inp_size = int(stft.n_feats_out * 3 / 2)
        output_size = stft.n_feats_out
    else:
        inp_size = output_size = int(stft.n_feats_out / 2)
    # Add these fields to the mask model dict
    conf['masknet'].update(dict(input_size=inp_size,
                                output_size=output_size))
    masker = SimpleModel(**conf['masknet'])
    # Make the complete model
    model = Model(stft, masker, istft,
                  is_complex=conf['main_args']['is_complex'])
    # Define optimizer of this model
    optimizer = make_optimizer(model.parameters(), **conf['optim'])
    return model, optimizer