SV2P model with additional cutoff in L2 loss for environments like pong.

def next_frame_sv2p_cutoff():
  """SV2P model with additional cutoff in L2 loss for environments like pong."""
  hparams = next_frame_sv2p()
  hparams.video_modality_loss_cutoff = 0.4
  hparams.video_num_input_frames = 4
  hparams.video_num_target_frames = 1
  return hparams