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Tianyi Alex Qiu

5 accepted papers

2026

Auditing Black-Box LLM APIs with a Rank-Based Uniformity Test

ICLR 2026poster

As API access becomes a primary interface to large language models (LLMs), users often interact with black-box systems that offer little transparency into the deployed model. To reduce costs or maliciously alter model behaviors, API providers may discreetly serve quantized or fine-tuned variants, wh…

Cited by 0SourcecodeScholar
2026

Truthfulness Despite Weak Supervision: Evaluating and Training LLMs Using Peer Prediction

ICLR 2026poster

The evaluation and post-training of large language models (LLMs) rely on supervision, but strong supervision for difficult tasks is often unavailable, especially when evaluating strong models. In such cases, models have been demonstrated to exploit evaluation schemes built on such imperfect supervis…

Cited by 0SourceScholar
2025

Language Models Resist Alignment: Evidence From Data Compression

ACL 2025long

Large language models (LLMs) may exhibit unintended or undesirable behaviors. Recent works have concentrated on aligning LLMs to mitigate harmful outputs. Despite these efforts, some anomalies indicate that even a well-conducted alignment process can be easily circumvented, whether intentionally or…

2025

PKU-SafeRLHF: Towards Multi-Level Safety Alignment for LLMs with Human Preference

ACL 2025long

In this work, we introduce the PKU-SafeRLHF dataset, designed to promote research on safety alignment in large language models (LLMs). As a sibling project to SafeRLHF and BeaverTails, we separate annotations of helpfulness and harmlessness for question-answering pairs, providing distinct perspectiv…

2025

Reward Generalization in RLHF: A Topological Perspective

ACL 2025finding

Existing alignment methods share a common topology of information flow, where reward information is collected from humans, modeled with preference learning, and used to tune language models. However, this shared topology has not been systematically characterized, nor have its alternatives been thoro…

Cited by 0SourcePDFScholar