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:

maml_rl/rllab/envs/mujoco/half_cheetah_env_rand_direc.py

Line 53 in 9c8e2eb

self.get_body_com("torso").flat,

It seems to me that it only complicates comparisons between methods which also use gym.
Thank you!