Humanoid and Ant expert (#66)
Humanoid and Ant expert (#66)

* Default to checkpointing policies (smaller, more general) than rollouts; still save rollouts at end of training

* Increase batch size for Ant and Humanoid

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