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cs.AI2026

TrAC: Trace-Conditioned Answer Consistency for Efficient Uncertainty Quantification in LLMs

Dahai Yu, Lin Jiang, Rongchao Xu +1

Large language models (LLMs) can generate fluent reasoning traces that nevertheless lead to incorrect answers, making response-level uncertainty estimation important for abstention…

cs.AI2026

SymboUQ: Symbolic Uncertainty Quantification for Spatial Reasoning in LLMs

Dahai Yu, Lin Jiang, Rongchao Xu +1

Although large language models (LLMs) can produce fluent spatial reasoning traces, their intermediate relations may fail to support the final conclusion, making token-level confide…

cs.AI2026

MobiDiff: Semantic-Aware Multi-Channel Discrete Diffusion for Human Mobility Data Generation

Rongchao Xu, Lin Jiang, Dahai Yu +5

Human mobility data are essential for transportation optimization, urban planning, and resource allocation, yet real-world mobility data are costly to collect and difficult to shar…

cs.AI2026

EnergyMamba: An Uncertainty-Aware Graph-Enhanced Selective State Space Model for Energy Consumption Prediction

Dahai Yu, Rongchao Xu, Lin Jiang +1

Energy consumption prediction is essential for efficient grid management, demand-side optimization, and sustainable energy planning. Although advanced machine learning methods have…

cs.AI2026

SynHAT: A Two-stage Coarse-to-Fine Diffusion Framework for Synthesizing Human Activity Traces

Rongchao Xu, Lin Jiang, Dahai Yu +2

Human activity traces (HATs) are critical for many applications, including human mobility modeling and point-of-interest (POI) recommendation. However, growing privacy concerns hav…