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About this paper
Jianchang Su, Dawei Xiang, Wei Zhang
FactorSpec uses structured-output constraints to draft tokens forced by field relations, while feasibility checks keep continuations valid. In trip planning, Qwen3-8B produced valid itineraries for 10% of 999 problems, or 14% with relation-specific retries. At eight requests in flight, it delivered 13.9 times as many valid records per GPU-second as syntax-only baselines; validity covers only declared relations.
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