Search Results for author: Ziwei Zhu

Found 33 papers, 12 papers with code

Generative Semantic Communication: Architectures, Technologies, and Applications

no code implementations11 Dec 2024 Jinke Ren, Yaping Sun, Hongyang Du, Weiwen Yuan, Chongjie Wang, Xianda Wang, Yingbin Zhou, Ziwei Zhu, Fangxin Wang, Shuguang Cui

This system features two LLM-based AI agents at both the transmitter and receiver, serving as "brains" to enable powerful information understanding and content regeneration capabilities, respectively.

Retrieval Video Retrieval

Cross-Domain Recommendation Meets Large Language Models

1 code implementation29 Nov 2024 Ajay Krishna Vajjala, Dipak Meher, Ziwei Zhu, David S. Rosenblum

Cross-domain recommendation (CDR) has emerged as a promising solution to the cold-start problem, faced by single-domain recommender systems.

Recommendation Systems

ORIS: Online Active Learning Using Reinforcement Learning-based Inclusive Sampling for Robust Streaming Analytics System

no code implementations27 Nov 2024 Rahul Pandey, Ziwei Zhu, Hemant Purohit

ORIS aims to create a novel Deep Q-Network-based strategy to sample incoming documents that minimize human errors in labeling and enhance the ML model performance.

Active Learning Emotion Recognition

Towards Robust Text Classification: Mitigating Spurious Correlations with Causal Learning

no code implementations1 Nov 2024 Yuqing Zhou, Ziwei Zhu

In text classification tasks, models often rely on spurious correlations for predictions, incorrectly associating irrelevant features with the target labels.

counterfactual Counterfactual Reasoning +3

Advancing Interpretability in Text Classification through Prototype Learning

no code implementations23 Oct 2024 Bowen Wei, Ziwei Zhu

Deep neural networks have achieved remarkable performance in various text-based tasks but often lack interpretability, making them less suitable for applications where transparency is critical.

Sentence text-classification +1

Navigating the Shortcut Maze: A Comprehensive Analysis of Shortcut Learning in Text Classification by Language Models

1 code implementation26 Sep 2024 Yuqing Zhou, Ruixiang Tang, Ziyu Yao, Ziwei Zhu

Language models (LMs), despite their advances, often depend on spurious correlations, undermining their accuracy and generalizability.

text-classification Text Classification

Assessing Large Language Models for Online Extremism Research: Identification, Explanation, and New Knowledge

no code implementations29 Aug 2024 Beidi Dong, Jin R. Lee, Ziwei Zhu, Balassubramanian Srinivasan

We also compared the performance of GPT 3. 5 and GPT 4 models using different prompts: na\"ive, layperson-definition, role-playing, and professional-definition.

Transfer Learning

Neural Symbolic Logical Rule Learner for Interpretable Learning

no code implementations21 Aug 2024 Bowen Wei, Ziwei Zhu

Rule-based neural networks stand out for enabling interpretable classification by learning logical rules for both prediction and interpretation.

Negation

Crossroads of Continents: Automated Artifact Extraction for Cultural Adaptation with Large Multimodal Models

1 code implementation2 Jul 2024 Anjishnu Mukherjee, Ziwei Zhu, Antonios Anastasopoulos

We present a comprehensive three-phase study to examine (1) the cultural understanding of Large Multimodal Models (LMMs) by introducing DalleStreet, a large-scale dataset generated by DALL-E 3 and validated by humans, containing 9, 935 images of 67 countries and 10 concept classes; (2) the underlying implicit and potentially stereotypical cultural associations with a cultural artifact extraction task; and (3) an approach to adapt cultural representation in an image based on extracted associations using a modular pipeline, CultureAdapt.

Breaking Bias, Building Bridges: Evaluation and Mitigation of Social Biases in LLMs via Contact Hypothesis

no code implementations2 Jul 2024 Chahat Raj, Anjishnu Mukherjee, Aylin Caliskan, Antonios Anastasopoulos, Ziwei Zhu

We propose a unique debiasing technique, Social Contact Debiasing (SCD), that instruction-tunes these models with unbiased responses to prompts.

BiasDora: Exploring Hidden Biased Associations in Vision-Language Models

1 code implementation2 Jul 2024 Chahat Raj, Anjishnu Mukherjee, Aylin Caliskan, Antonios Anastasopoulos, Ziwei Zhu

Existing works examining Vision-Language Models (VLMs) for social biases predominantly focus on a limited set of documented bias associations, such as gender:profession or race:crime.

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

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

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.

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

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

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.

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 Conversational Recommendation

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

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

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

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.

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

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

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

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

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 Sequential Decision Making

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

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

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