FixedReferenceNBPO on UltraFeedback
Matched game-aggregation control: same response pool, temperatures, disagreement point and optimiser budget as NBPO, differing only in how the objective weights are chosen.
- Panel: UltraFeedback
- Objectives: instruction following, truthfulness, honesty, helpfulness
- Backbone / reference policy:
meta-llama/Llama-3.1-8B-Instruct - Training budget: 300 optimiser updates, global batch 16
- Reported in: Nash Bargaining Preference Optimization (NBPO), Table 2 (primary cross-method evaluation)
Evaluation protocol: independent objective-wise win rate against the common reference,
judged by Llama-3.3-70B-Instruct on prompt-disjoint held-out prompts, both presentation orders.