meaning of expert data of gail

[zyzhang1130]

Hi can someone help to clarify the expert data of gail? I downloaded deterministic.trpo.HalfCheetah.0.00 and inside it there are 4 .npy files called acs, ep_rets, obs and rews respectively. When I load them, they are either 1, 2 or 3 dimensional np arrays. Can someone help to interpret what do they mean? I need to know in order to create my own expert data. Thanks a lot.