def _augment_time_step()

in dmc.py [0:0]


    def _augment_time_step(self, time_step, action=None):
        if action is None:
            action_spec = self.action_spec()
            action = np.zeros(action_spec.shape, dtype=action_spec.dtype)
        return ExtendedTimeStep(observation=time_step.observation,
                                step_type=time_step.step_type,
                                action=action,
                                reward=time_step.reward or 0.0,
                                discount=time_step.discount or 1.0)