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Recent work shows that paired preference data from weak-weaker model pairs (e.g., Qwen3 4B over 1.7B), despite the limited quality of individual responses, can provide an effective supervision signal through relative quality deltas, which we term a \"weak\" signal. This motivates a key research question: can multiple \"weak\" signals be constructively aggregated for improving strong models (e.g., Qwen3 8B)? To this end, we propose Preference Delta Aggregation (PDA), the first framework that derives a preference delta from each weak-weaker model pair, instantiates it as a LoRA adapter learned through preference optimization, and aggregates the resulting deltas via LoRA merging. To further mitigate directional interference during LoRA merging, we introduce Geometric Alignment Merging (GAM), a geometry-aware merging method that aligns adap","title":"From \"Weak\" Signals to Strong Models: Preference Delta Aggregation with LoRA Merging","url":"https://arxiv.org/abs/2606.00357","vendor":"arxiv_cs_ai"},"summary":"arXiv:2606.00357v2 Announce Type: replace \nAbstract: Training strong large language models (LLMs) requires high-quality supervision, which is often scarce. Recent work shows that paired preference data from weak-weaker model pairs (e.g., Qwen3 4B over 1.7B), despite the limited quality of individual responses, can provide an effective supervision signal through relative quality deltas, which we term a \"weak\" signal. This motivates a key research question: can multiple \"weak\" signals be constructively aggregated for improving strong models (e.g., Qwen3 8B)? 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