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Jianfeng Chi

12 accepted papers

2025

Backtracking Improves Generation Safety

ICLR 2025oral

Text generation has a fundamental limitation almost by definition: there is no taking back tokens that have been generated, even when they are clearly problematic. In the context of language model safety, when a partial unsafe generation is produced, language models by their nature tend to happily k…

Cited by 14SourcePDFScholar
2025

Persistent Pre-training Poisoning of LLMs

ICLR 2025poster

Large language models are pre-trained on uncurated text datasets consisting of trillions of tokens scraped from the Web. Prior work has shown that: (1) web-scraped pre-training datasets can be practically poisoned by malicious actors; and (2) adversaries can compromise language models after poisonin…

Cited by 3SourcePDFScholar
2025

Shape it Up! Restoring LLM Safety during Finetuning

NeurIPS 2025poster

Finetuning large language models (LLMs) enables user-specific customization but introduces critical safety risks: even a few harmful examples can compromise safety alignment. A common mitigation strategy is to update the model more strongly on examples deemed safe, while downweighting or excluding t…

Cited by 0SourcecodeScholar
2025

Towards Understanding the Fragility of Multilingual LLMs against Fine-Tuning Attacks

NAACL 2025findings

Recent advancements in Large Language Models (LLMs) have sparked widespread concerns about their safety. Recent work demonstrates that safety alignment of LLMs can be easily removed by fine-tuning with a few adversarially chosen instruction-following examples, i.e., fine-tuning attacks. We take a fu…

Cited by 8SourcePDFScholar
2024

EAVE: Efficient Product Attribute Value Extraction via Lightweight Sparse-layer Interaction

EMNLP 2024finding

Product attribute value extraction involves identifying the specific values associated with various attributes from a product profile. While existing methods often prioritize the development of effective models to improve extraction performance, there has been limited emphasis on extraction efficien…

Cited by 1SourcePDFScholar
2024

FFB: A Fair Fairness Benchmark for In-Processing Group Fairness Methods

ICLR 2024poster

This paper introduces the Fair Fairness Benchmark (FFB), a benchmarking framework for in-processing group fairness methods. Ensuring fairness in machine learning is important for ethical compliance. However, there exist challenges in comparing and developing fairness methods due to inconsistencies i…

2023

PLUE: Language Understanding Evaluation Benchmark for Privacy Policies in English

ACL 2023short

Privacy policies provide individuals with information about their rights and how their personal information is handled. Natural language understanding (NLU) technologies can support individuals and practitioners to understand better privacy practices described in lengthy and complex documents. Howev…

2022

Conditional Supervised Contrastive Learning for Fair Text Classification

EMNLP 2022finding

Contrastive representation learning has gained much attention due to its superior performance in learning representations from both image and sequential data. However, the learned representations could potentially lead to performance disparities in downstream tasks, such as increased silencing of un…

2022

Towards Return Parity in Markov Decision Processes

AISTATS 2022poster

Algorithmic decisions made by machine learning models in high-stakes domains may have lasting impacts over time. However, naive applications of standard fairness criterion in static settings over temporal domains may lead to delayed and adverse effects. To understand the dynamics of performance disp…

2021

Intent Classification and Slot Filling for Privacy Policies

ACL 2021long

Understanding privacy policies is crucial for users as it empowers them to learn about the information that matters to them. Sentences written in a privacy policy document explain privacy practices, and the constituent text spans convey further specific information about that practice. We refer to p…

2021

Understanding and Mitigating Accuracy Disparity in Regression

ICML 2021spotlight

With the widespread deployment of large-scale prediction systems in high-stakes domains, e.g., face recognition, criminal justice, etc., disparity on prediction accuracy between different demographic subgroups has called for fundamental understanding on the source of such disparity and algorithmic i…

2020

Trade-offs and Guarantees of Adversarial Representation Learning for Information Obfuscation

NeurIPS 2020poster

Crowdsourced data used in machine learning services might carry sensitive information about attributes that users do not want to share. Various methods have been proposed to minimize the potential information leakage of sensitive attributes while maximizing the task accuracy. However, little is know…

Cited by 32SourcePDFScholar