Vel factory function

def create(model_config, vec_env, model, algo, env_roller, parallel_envs: int,
           rollout_steps: int, training_steps: int, training_rounds: int=1):
    """ Vel factory function """
    settings = BufferedOffPolicyIterationReinforcerSettings(
        rollout_steps=rollout_steps,
        training_steps=training_steps,
        training_rounds=training_rounds
    )

    return BufferedOffPolicyIterationReinforcerFactory(
        settings=settings,
        env_factory=vec_env,
        model_factory=model,
        algo=algo,
        env_roller_factory=env_roller,
        parallel_envs=parallel_envs,
        seed=model_config.seed
    )