Half cheetah observations with self.get_body_com("torso").flat

[IraKorshunova]

Hello! I'm wondering if there are any good reasons for adding self.get_body_com("torso").flat to the observations of half cheetah: https://github.com/cbfinn/maml_rl/blob/9c8e2ebd741cb0c7b8bf2d040c4caeeb8e06cc95/rllab/envs/mujoco/half_cheetah_env_rand_direc.py#L53 It seems to me that it only complicates comparisons between methods which also use gym.
Thank you!