In navigation tasks, DQN learns MDP-homomorphism-invariant representations while PPO learns action-symmetric ones despite comparable performance, with effects on transfer and in LLMs.
Predictive auxiliary objectives in deep rl mimic learning in the brain.arXiv preprint arXiv:2310.06089, 2023
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Task-Induced Representational Invariances Depend on Learning Objective in Deep RL
In navigation tasks, DQN learns MDP-homomorphism-invariant representations while PPO learns action-symmetric ones despite comparable performance, with effects on transfer and in LLMs.