Search Results for author: Ziwei Zhu

Found 22 papers, 8 papers with code

Robust high dimensional factor models with applications to statistical machine learning

no code implementations12 Aug 2018 Jianqing Fan, Kaizheng Wang, Yiqiao Zhong, Ziwei Zhu

Factor models are a class of powerful statistical models that have been widely used to deal with dependent measurements that arise frequently from various applications from genomics and neuroscience to economics and finance.

BIG-bench Machine Learning Model Selection +1

Fairness-Aware Recommendation of Information Curators

no code implementations9 Sep 2018 Ziwei Zhu, Jianling Wang, Yin Zhang, James Caverlee

This paper highlights our ongoing efforts to create effective information curator recommendation models that can be personalized for individual users, while maintaining important fairness properties.

Fairness

Learning Markov models via low-rank optimization

no code implementations28 Jun 2019 Ziwei Zhu, Xudong Li, Mengdi Wang, Anru Zhang

We show that one can estimate the full transition model accurately using a trajectory of length that is proportional to the total number of states.

Decision Making

Popularity-Opportunity Bias in Collaborative Filtering

no code implementations WSDM 2021 Ziwei Zhu, Yun He, Xing Zhao, Yin Zhang, Jianling Wang, James Caverlee

This paper connects equal opportunity to popularity bias in implicit recommenders to introduce the problem of popularity-opportunity bias.

Collaborative Filtering

Fairness-aware Personalized Ranking Recommendation via Adversarial Learning

1 code implementation14 Mar 2021 Ziwei Zhu, Jianling Wang, James Caverlee

This is paper is an extended and reorganized version of our SIGIR 2020~\cite{zhu2020measuring} paper.

Fairness Recommendation Systems

End-to-end Learning for Fair Ranking Systems

no code implementations21 Nov 2021 James Kotary, Ferdinando Fioretto, Pascal Van Hentenryck, Ziwei Zhu

The end-to-end SPOFR framework includes a constrained optimization sub-model and produces ranking policies that are guaranteed to satisfy fairness constraints while allowing for fine control of the fairness-utility tradeoff.

Fairness Learning-To-Rank

Session-based Recommendation with Hypergraph Attention Networks

no code implementations28 Dec 2021 Jianling Wang, Kaize Ding, Ziwei Zhu, James Caverlee

Session-based recommender systems aim to improve recommendations in short-term sessions that can be found across many platforms.

Session-Based Recommendations

Supervised Homogeneity Fusion: a Combinatorial Approach

no code implementations4 Jan 2022 Wen Wang, Shihao Wu, Ziwei Zhu, Ling Zhou, Peter X. -K. Song

Fusing regression coefficients into homogenous groups can unveil those coefficients that share a common value within each group.

Quantifying and Mitigating Popularity Bias in Conversational Recommender Systems

no code implementations5 Aug 2022 Allen Lin, Jianling Wang, Ziwei Zhu, James Caverlee

Conversational recommender systems (CRS) have shown great success in accurately capturing a user's current and detailed preference through the multi-round interaction cycle while effectively guiding users to a more personalized recommendation.

Attribute Recommendation Systems

Understanding Best Subset Selection: A Tale of Two C(omplex)ities

no code implementations16 Jan 2023 Saptarshi Roy, Ambuj Tewari, Ziwei Zhu

Furthermore, we show that a margin condition depending on similar margin quantity and complexity measures is also necessary for model consistency of BSS.

Model Selection Variable Selection +1

Evolution of Filter Bubbles and Polarization in News Recommendation

no code implementations26 Jan 2023 Han Zhang, Ziwei Zhu, James Caverlee

However, most existing work focuses on a static setting or over a short-time window, leaving open questions about the long-term and dynamic impacts of news recommendations.

News Recommendation Recommendation Systems

Enhancing User Personalization in Conversational Recommenders

no code implementations13 Feb 2023 Allen Lin, Ziwei Zhu, Jianling Wang, James Caverlee

Conversational recommenders are emerging as a powerful tool to personalize a user's recommendation experience.

Attribute

PromptAttack: Probing Dialogue State Trackers with Adversarial Prompts

1 code implementation7 Jun 2023 Xiangjue Dong, Yun He, Ziwei Zhu, James Caverlee

A key component of modern conversational systems is the Dialogue State Tracker (or DST), which models a user's goals and needs.

A meta learning scheme for fast accent domain expansion in Mandarin speech recognition

no code implementations23 Jul 2023 Ziwei Zhu, Changhao Shan, Bihong Zhang, Jian Yu

We combine the methods of meta learning and freeze of model parameters, which makes the recognition performance more stable in different cases and the training faster about 20%.

Automatic Speech Recognition Automatic Speech Recognition (ASR) +2

Unsupervised Candidate Answer Extraction through Differentiable Masker-Reconstructor Model

no code implementations19 Oct 2023 Zhuoer Wang, Yicheng Wang, Ziwei Zhu, James Caverlee

Question generation is a widely used data augmentation approach with extensive applications, and extracting qualified candidate answers from context passages is a critical step for most question generation systems.

Data Augmentation Question Generation +1

Global Voices, Local Biases: Socio-Cultural Prejudices across Languages

1 code implementation26 Oct 2023 Anjishnu Mukherjee, Chahat Raj, Ziwei Zhu, Antonios Anastasopoulos

Finally, we highlight the significance of these social biases and the new dimensions through an extensive comparison of embedding methods, reinforcing the need to address them in pursuit of more equitable language models.

Breaking the Trilemma of Privacy, Utility, Efficiency via Controllable Machine Unlearning

1 code implementation28 Oct 2023 Zheyuan Liu, Guangyao Dou, Yijun Tian, Chunhui Zhang, Eli Chien, Ziwei Zhu

Exploring the full spectrum of trade-offs between privacy, model utility, and runtime efficiency is critical for practical unlearning scenarios.

Machine Unlearning

Countering Mainstream Bias via End-to-End Adaptive Local Learning

1 code implementation13 Apr 2024 Jinhao Pan, Ziwei Zhu, Jianling Wang, Allen Lin, James Caverlee

In this paper, we identify two root causes of this mainstream bias: (i) discrepancy modeling, whereby CF algorithms focus on modeling mainstream users while neglecting niche users with unique preferences; and (ii) unsynchronized learning, where niche users require more training epochs than mainstream users to reach peak performance.

Collaborative Filtering

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