Search Results for author: Jianfeng Chi

Found 16 papers, 11 papers with code

Where have you been? A Study of Privacy Risk for Point-of-Interest Recommendation

no code implementations28 Oct 2023 Kunlin Cai, Jinghuai Zhang, Will Shand, Zhiqing Hong, Guang Wang, Desheng Zhang, Jianfeng Chi, Yuan Tian

These attacks in our attack suite assume different adversary knowledge and aim to extract different types of sensitive information from mobility data, providing a holistic privacy risk assessment for POI recommendation models.

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

1 code implementation15 Jun 2023 Xiaotian Han, Jianfeng Chi, Yu Chen, Qifan Wang, Han Zhao, Na Zou, Xia Hu

This paper introduces the Fair Fairness Benchmark (\textsf{FFB}), a benchmarking framework for in-processing group fairness methods.

Benchmarking Fairness

PLUE: Language Understanding Evaluation Benchmark for Privacy Policies in English

1 code implementation20 Dec 2022 Jianfeng Chi, Wasi Uddin Ahmad, Yuan Tian, Kai-Wei Chang

Privacy policies provide individuals with information about their rights and how their personal information is handled.

Language Modelling Natural Language Understanding

Reliable Representations Make A Stronger Defender: Unsupervised Structure Refinement for Robust GNN

1 code implementation30 Jun 2022 Kuan Li, Yang Liu, Xiang Ao, Jianfeng Chi, Jinghua Feng, Hao Yang, Qing He

However, both strategies are faced with some immediate problems: raw features cannot represent various properties of nodes (e. g., structure information), and representations learned by supervised GNN may suffer from the poor performance of the classifier on the poisoned graph.

Conditional Supervised Contrastive Learning for Fair Text Classification

1 code implementation23 May 2022 Jianfeng Chi, William Shand, Yaodong Yu, Kai-Wei Chang, Han Zhao, Yuan Tian

Contrastive representation learning has gained much attention due to its superior performance in learning representations from both image and sequential data.

Contrastive Learning Fairness +3

Retrieval Enhanced Data Augmentation for Question Answering on Privacy Policies

no code implementations19 Apr 2022 Md Rizwan Parvez, Jianfeng Chi, Wasi Uddin Ahmad, Yuan Tian, Kai-Wei Chang

Prior studies in privacy policies frame the question answering (QA) task as identifying the most relevant text segment or a list of sentences from a policy document given a user query.

Data Augmentation Question Answering +1

Towards Return Parity in Markov Decision Processes

1 code implementation19 Nov 2021 Jianfeng Chi, Jian Shen, Xinyi Dai, Weinan Zhang, Yuan Tian, Han Zhao

We first provide a decomposition theorem for return disparity, which decomposes the return disparity of any two MDPs sharing the same state and action spaces into the distance between group-wise reward functions, the discrepancy of group policies, and the discrepancy between state visitation distributions induced by the group policies.

Fairness Recommendation Systems

Pick and Choose: A GNN-based Imbalanced Learning Approach for Fraud Detection

1 code implementation The Web Conference 2021 Yang Liu1, Xiang Ao, Zidi Qin, Jianfeng Chi, Jinghua Feng, Hao Yang, Qing He

Graph-based fraud detection approaches have escalated lots of attention recently due to the abundant relational information of graph-structured data, which may be beneficial for the detection of fraudsters.

Fraud Detection Node Classification

Understanding and Mitigating Accuracy Disparity in Regression

1 code implementation24 Feb 2021 Jianfeng Chi, Yuan Tian, Geoffrey J. Gordon, Han Zhao

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

Face Recognition regression

Intent Classification and Slot Filling for Privacy Policies

1 code implementation ACL 2021 Wasi Uddin Ahmad, Jianfeng Chi, Tu Le, Thomas Norton, Yuan Tian, Kai-Wei Chang

We refer to predicting the privacy practice explained in a sentence as intent classification and identifying the text spans sharing specific information as slot filling.

General Classification intent-classification +3

PolicyQA: A Reading Comprehension Dataset for Privacy Policies

1 code implementation Findings of the Association for Computational Linguistics 2020 Wasi Uddin Ahmad, Jianfeng Chi, Yuan Tian, Kai-Wei Chang

Prior studies in this domain frame the QA task as retrieving the most relevant text segment or a list of sentences from the policy document given a question.

Question Answering Reading Comprehension

Adversarial Privacy Preservation under Attribute Inference Attack

no code implementations25 Sep 2019 Han Zhao, Jianfeng Chi, Yuan Tian, Geoffrey J. Gordon

With the prevalence of machine learning services, crowdsourced data containing sensitive information poses substantial privacy challenges.

Attribute Inference Attack +1

Hybrid Batch Attacks: Finding Black-box Adversarial Examples with Limited Queries

1 code implementation19 Aug 2019 Fnu Suya, Jianfeng Chi, David Evans, Yuan Tian

In a black-box setting, the adversary only has API access to the target model and each query is expensive.

Cryptography and Security

Privacy Partitioning: Protecting User Data During the Deep Learning Inference Phase

no code implementations7 Dec 2018 Jianfeng Chi, Emmanuel Owusu, Xuwang Yin, Tong Yu, William Chan, Patrick Tague, Yuan Tian

We present a practical method for protecting data during the inference phase of deep learning based on bipartite topology threat modeling and an interactive adversarial deep network construction.

BIG-bench Machine Learning Face Identification +1

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