discrim: Share logging logic between GAIL & AIRL (#156)
discrim: Share logging logic between GAIL & AIRL (#156)

* discrim: Share logging logic between GAIL & AIRL

* self-review

* Address comments

humancompatibleai/imitation,HumanCompatibleAI/imitation,HumanCompatibleAI/imitation,humancompatibleai/imitation