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)