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arXiv

BIRD Unifies Iterative Reward Design Evaluation: Simple Design Choices Are Most Robust, and ERA-U/ERA-S Rank First and Second Under Matched Budgets

The authors introduce BIRD, which expresses 14 published iterative reward design (IRD) methods as configurations of one loop, compares 6 published methods and ablates 30 design choices across MuJoCo, Meta-World, Assistax and HumanoidBench under matched feedback conditions and policy-training budgets, finding that most choices (including the authors' own proposals) have small or inconclusive effects while a few simple choices (such as greedily retaining checkpoints and summarizing feedback) help consistently; a small hill-climb from RDA yields ERA-U and ERA-S, which take first and second place in the pooled Bradley–Terry ranking, though a small human study shows high benchmark scores do not imply natural behavior.