ARCA assigns token credit in LoRA-based LLM RL from the norm of adapter-induced hidden state changes, yielding non-degenerate distributions and competitive performance on MATH tasks with Qwen3-1.7B under GRPO.
Token-Efficient
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ARCA: Adapter-Residual Credit Assignment When Token Signals Degenerate
ARCA assigns token credit in LoRA-based LLM RL from the norm of adapter-induced hidden state changes, yielding non-degenerate distributions and competitive performance on MATH tasks with Qwen3-1.7B under GRPO.