Authors

Yiwei Yang

Publications 2

Preprint Open access

Multi-Channel Mitigation of Source-Trust Shortcuts in Fact-Checking RL Agents

Jianchang Su, Yiwei Yang, Wei Zhang · 2026

Retrieval-augmented fact-checkers often receive a reliability label, such as HIGH or LOW trust, for each evidence source. These labels should adjust the model's confidence and its decision to search for more evidence, while the verdict should follow the evidence content. We introduce TrustSwap, a counterfactual test th …

Preprint Open access

Spurious Tool Use: When RL Agents Learn the Wrong Reason to Act

Yiwei Yang, Haoxiang Zhang, Bingbing Wen et al. · 2026

Large language model (LLM) agents increasingly interleave natural language reasoning with external tools such as web search and code execution. These tool-use policies are often optimized via reinforcement learning (RL), which can amplify spurious correlations in the training data. In this work, we study when and why R …

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