Search Results for author: An Zhang

Found 25 papers, 19 papers with code

General Debiasing for Graph-based Collaborative Filtering via Adversarial Graph Dropout

1 code implementation21 Feb 2024 An Zhang, Wenchang Ma, Pengbo Wei, Leheng Sheng, Xiang Wang

However, we have discovered that this aggregation mechanism comes with a drawback, which amplifies biases present in the interaction graph.

Collaborative Filtering Recommendation Systems +1

Towards Goal-oriented Intelligent Tutoring Systems in Online Education

no code implementations3 Dec 2023 Yang Deng, Zifeng Ren, An Zhang, Wenqiang Lei, Tat-Seng Chua

In this work, we investigate a new task, named Goal-oriented Intelligent Tutoring Systems (GITS), which aims to enable the student's mastery of a designated concept by strategically planning a customized sequence of exercises and assessment.

cognitive diagnosis Representation Learning

Large Language Model Can Interpret Latent Space of Sequential Recommender

2 code implementations31 Oct 2023 Zhengyi Yang, Jiancan Wu, Yanchen Luo, Jizhi Zhang, Yancheng Yuan, An Zhang, Xiang Wang, Xiangnan He

Sequential recommendation is to predict the next item of interest for a user, based on her/his interaction history with previous items.

Language Modelling Large Language Model +1

Empowering Collaborative Filtering with Principled Adversarial Contrastive Loss

1 code implementation NeurIPS 2023 An Zhang, Leheng Sheng, Zhibo Cai, Xiang Wang, Tat-Seng Chua

To bridge the gap, we delve into the reasons underpinning the success of contrastive loss in CF, and propose a principled Adversarial InfoNCE loss (AdvInfoNCE), which is a variant of InfoNCE, specially tailored for CF methods.

Collaborative Filtering Contrastive Learning +3

Rethinking Tokenizer and Decoder in Masked Graph Modeling for Molecules

1 code implementation NeurIPS 2023 Zhiyuan Liu, Yaorui Shi, An Zhang, Enzhi Zhang, Kenji Kawaguchi, Xiang Wang, Tat-Seng Chua

Our results show that a subgraph-level tokenizer and a sufficiently expressive decoder with remask decoding have a large impact on the encoder's representation learning.

Representation Learning Self-Supervised Learning

ReLM: Leveraging Language Models for Enhanced Chemical Reaction Prediction

1 code implementation20 Oct 2023 Yaorui Shi, An Zhang, Enzhi Zhang, Zhiyuan Liu, Xiang Wang

Predicting chemical reactions, a fundamental challenge in chemistry, involves forecasting the resulting products from a given reaction process.

Chemical Reaction Prediction

Robust Collaborative Filtering to Popularity Distribution Shift

1 code implementation16 Oct 2023 An Zhang, Wenchang Ma, Jingnan Zheng, Xiang Wang, Tat-Seng Chua

The popularity shortcut tricks are good for in-distribution (ID) performance but poorly generalized to out-of-distribution (OOD) data, i. e., when popularity distribution of test data shifts w. r. t.

Collaborative Filtering

On Generative Agents in Recommendation

1 code implementation16 Oct 2023 An Zhang, Leheng Sheng, Yuxin Chen, Hao Li, Yang Deng, Xiang Wang, Tat-Seng Chua

Recommender systems are the cornerstone of today's information dissemination, yet a disconnect between offline metrics and online performance greatly hinders their development.

Collaborative Filtering Movie Recommendation +1

Online Distillation-enhanced Multi-modal Transformer for Sequential Recommendation

1 code implementation8 Aug 2023 Wei Ji, Xiangyan Liu, An Zhang, Yinwei Wei, Yongxin Ni, Xiang Wang

To be specific, we first introduce an ID-aware Multi-modal Transformer module in the item representation learning stage to facilitate information interaction among different features.

Collaborative Filtering Representation Learning +1

Discovering Dynamic Causal Space for DAG Structure Learning

1 code implementation5 Jun 2023 Fangfu Liu, Wenchang Ma, An Zhang, Xiang Wang, Yueqi Duan, Tat-Seng Chua

Discovering causal structure from purely observational data (i. e., causal discovery), aiming to identify causal relationships among variables, is a fundamental task in machine learning.

Causal Discovery Combinatorial Optimization

Boosting Differentiable Causal Discovery via Adaptive Sample Reweighting

1 code implementation6 Mar 2023 An Zhang, Fangfu Liu, Wenchang Ma, Zhibo Cai, Xiang Wang, Tat-Seng Chua

Despite great success in low-dimensional linear systems, it has been observed that these approaches overly exploit easier-to-fit samples, thus inevitably learning spurious edges.

Bilevel Optimization Causal Discovery

Invariant Collaborative Filtering to Popularity Distribution Shift

1 code implementation10 Feb 2023 An Zhang, Jingnan Zheng, Xiang Wang, Yancheng Yuan, Tat-Seng Chua

Collaborative Filtering (CF) models, despite their great success, suffer from severe performance drops due to popularity distribution shifts, where these changes are ubiquitous and inevitable in real-world scenarios.

Collaborative Filtering Representation Learning

Incorporating Bias-aware Margins into Contrastive Loss for Collaborative Filtering

1 code implementation20 Oct 2022 An Zhang, Wenchang Ma, Xiang Wang, Tat-Seng Chua

Collaborative filtering (CF) models easily suffer from popularity bias, which makes recommendation deviate from users' actual preferences.

Collaborative Filtering

Let Invariant Rationale Discovery Inspire Graph Contrastive Learning

1 code implementation16 Jun 2022 Sihang Li, Xiang Wang, An Zhang, Yingxin Wu, Xiangnan He, Tat-Seng Chua

Specifically, without supervision signals, RGCL uses a rationale generator to reveal salient features about graph instance-discrimination as the rationale, and then creates rationale-aware views for contrastive learning.

Contrastive Learning

CrossCBR: Cross-view Contrastive Learning for Bundle Recommendation

1 code implementation1 Jun 2022 Yunshan Ma, Yingzhi He, An Zhang, Xiang Wang, Tat-Seng Chua

Recent methods usually take advantage of both user-bundle and user-item interactions information to obtain informative representations for users and bundles, corresponding to bundle view and item view, respectively.

Contrastive Learning Graph Learning

Differentiable Invariant Causal Discovery

no code implementations31 May 2022 Yu Wang, An Zhang, Xiang Wang, Yancheng Yuan, Xiangnan He, Tat-Seng Chua

This paper proposes Differentiable Invariant Causal Discovery (DICD), utilizing the multi-environment information based on a differentiable framework to avoid learning spurious edges and wrong causal directions.

Causal Discovery

Reinforced Causal Explainer for Graph Neural Networks

1 code implementation23 Apr 2022 Xiang Wang, Yingxin Wu, An Zhang, Fuli Feng, Xiangnan He, Tat-Seng Chua

Such reward accounts for the dependency of the newly-added edge and the previously-added edges, thus reflecting whether they collaborate together and form a coalition to pursue better explanations.

Graph Classification

Discovering Invariant Rationales for Graph Neural Networks

1 code implementation ICLR 2022 Ying-Xin Wu, Xiang Wang, An Zhang, Xiangnan He, Tat-Seng Chua

Intrinsic interpretability of graph neural networks (GNNs) is to find a small subset of the input graph's features -- rationale -- which guides the model prediction.

Graph Classification

Deconfounding to Explanation Evaluation in Graph Neural Networks

no code implementations21 Jan 2022 Ying-Xin Wu, Xiang Wang, An Zhang, Xia Hu, Fuli Feng, Xiangnan He, Tat-Seng Chua

In this work, we propose Deconfounded Subgraph Evaluation (DSE) which assesses the causal effect of an explanatory subgraph on the model prediction.

Towards Multi-Grained Explainability for Graph Neural Networks

1 code implementation NeurIPS 2021 Xiang Wang, Yingxin Wu, An Zhang, Xiangnan He, Tat-Seng Chua

A performant paradigm towards multi-grained explainability is until-now lacking and thus a focus of our work.

A-FMI: Learning Attributions from Deep Networks via Feature Map Importance

no code implementations12 Apr 2021 An Zhang, Xiang Wang, Chengfang Fang, Jie Shi, Tat-Seng Chua, Zehua Chen

Gradient-based attribution methods can aid in the understanding of convolutional neural networks (CNNs).

Causal Screening to Interpret Graph Neural Networks

no code implementations1 Jan 2021 Xiang Wang, Yingxin Wu, An Zhang, Xiangnan He, Tat-Seng Chua

In this work, we focus on the causal interpretability in GNNs and propose a method, Causal Screening, from the perspective of cause-effect.

Explanation Generation

Disentangled Graph Collaborative Filtering

2 code implementations3 Jul 2020 Xiang Wang, Hongye Jin, An Zhang, Xiangnan He, Tong Xu, Tat-Seng Chua

Such uniform approach to model user interests easily results in suboptimal representations, failing to model diverse relationships and disentangle user intents in representations.

Collaborative Filtering Disentanglement

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