Returns a task-agent tuple whose action is always minus one.

def get_neg_one_task_agent(generators, market, nOffer, maxSteps):
    """ Returns a task-agent tuple whose action is always minus one.
    """
    env = pyreto.discrete.MarketEnvironment(generators, market, nOffer)
    task = pyreto.discrete.ProfitTask(env, maxSteps=maxSteps)
    agent = pyreto.util.NegOneAgent(env.outdim, env.indim)
    return task, agent