Tiny set for testing.

def rlmb_dqn_tiny():
  """Tiny set for testing."""
  hparams = rlmb_dqn_base()
  hparams = hparams.override_from_dict(_rlmb_tiny_overrides())
  update_hparams(hparams, dict(
      simulated_rollout_length=2,
      dqn_time_limit=2,
      dqn_num_frames=128,
      real_dqn_replay_buffer_replay_capacity=100,
      dqn_replay_buffer_replay_capacity=100,
      real_dqn_agent_min_replay_history=10,
      dqn_agent_min_replay_history=10,
  ))
  return hparams