Residual discrete autoencoder model, big version.

def autoencoder_residual_discrete_big():
  """Residual discrete autoencoder model, big version."""
  hparams = autoencoder_residual_discrete()
  hparams.hidden_size = 128
  hparams.max_hidden_size = 4096
  hparams.bottleneck_noise = 0.1
  hparams.residual_dropout = 0.4
  return hparams