Vel factory function

def create(model_config, model, vec_env, algo, env_roller,
           parallel_envs, number_of_steps,
           experience_replay=1, stochastic_experience_replay=True):
    """ Vel factory function """
    settings = BufferedMixedPolicyIterationReinforcerSettings(
        experience_replay=experience_replay,
        stochastic_experience_replay=stochastic_experience_replay,
        number_of_steps=number_of_steps
    )

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