SAVP - VAE only model.

def next_frame_savp_vae():
  """SAVP - VAE only model."""
  hparams = next_frame_savp()
  hparams.use_vae = True
  hparams.use_gan = False
  hparams.latent_loss_multiplier = 1e-3
  hparams.latent_loss_multiplier_schedule = "linear_anneal"
  return hparams