Under the assumption that the response reward equals the discounted sum of token rewards, response-level rewards suffice for unbiased token-level policy gradients in LLMs.
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Response-Level Rewards Are All You Need for Online Reinforcement Learning in LLMs: A Mathematical Perspective
Under the assumption that the response reward equals the discounted sum of token rewards, response-level rewards suffice for unbiased token-level policy gradients in LLMs.