Search Results for author: Zemin Liu

Found 20 papers, 12 papers with code

BuffGraph: Enhancing Class-Imbalanced Node Classification via Buffer Nodes

no code implementations20 Feb 2024 Qian Wang, Zemin Liu, Zhen Zhang, Bingsheng He

Class imbalance in graph-structured data, where minor classes are significantly underrepresented, poses a critical challenge for Graph Neural Networks (GNNs).

Classification Node Classification

Advancing Graph Representation Learning with Large Language Models: A Comprehensive Survey of Techniques

no code implementations4 Feb 2024 Qiheng Mao, Zemin Liu, Chenghao Liu, Zhuo Li, Jianling Sun

This collaboration harnesses the sophisticated linguistic capabilities of LLMs to improve the contextual understanding and adaptability of graph models, thereby broadening the scope and potential of GRL.

Graph Representation Learning

HGPROMPT: Bridging Homogeneous and Heterogeneous Graphs for Few-shot Prompt Learning

no code implementations4 Dec 2023 Xingtong Yu, Yuan Fang, Zemin Liu, Xinming Zhang

In this paper, we propose HGPROMPT, a novel pre-training and prompting framework to unify not only pre-training and downstream tasks but also homogeneous and heterogeneous graphs via a dual-template design.

Graph Representation Learning

ULTRA-DP: Unifying Graph Pre-training with Multi-task Graph Dual Prompt

1 code implementation23 Oct 2023 Mouxiang Chen, Zemin Liu, Chenghao Liu, Jundong Li, Qiheng Mao, Jianling Sun

Based on this framework, we propose a prompt-based transferability test to find the most relevant pretext task in order to reduce the semantic gap.

Multi-Task Learning Position

EX-Graph: A Pioneering Dataset Bridging Ethereum and X

1 code implementation2 Oct 2023 Qian Wang, Zhen Zhang, Zemin Liu, Shengliang Lu, Bingqiao Luo, Bingsheng He

While numerous public blockchain datasets are available, their utility is constrained by an exclusive focus on blockchain data.

Link Prediction

Identifiability Matters: Revealing the Hidden Recoverable Condition in Unbiased Learning to Rank

no code implementations27 Sep 2023 Mouxiang Chen, Chenghao Liu, Zemin Liu, Zhuo Li, Jianling Sun

Unbiased Learning to Rank (ULTR) aims to train unbiased ranking models from biased click logs, by explicitly modeling a generation process for user behavior and fitting click data based on examination hypothesis.

Learning-To-Rank

A Survey of Imbalanced Learning on Graphs: Problems, Techniques, and Future Directions

1 code implementation26 Aug 2023 Zemin Liu, Yuan Li, Nan Chen, Qian Wang, Bryan Hooi, Bingsheng He

However, these methods often suffer from data imbalance, a common issue in graph data where certain segments possess abundant data while others are scarce, thereby leading to biased learning outcomes.

Graph Learning Link Prediction +1

HINormer: Representation Learning On Heterogeneous Information Networks with Graph Transformer

1 code implementation22 Feb 2023 Qiheng Mao, Zemin Liu, Chenghao Liu, Jianling Sun

To bridge this gap, in this paper we investigate the representation learning on HINs with Graph Transformer, and propose a novel model named HINormer, which capitalizes on a larger-range aggregation mechanism for node representation learning.

Representation Learning

Link Prediction on Latent Heterogeneous Graphs

1 code implementation21 Feb 2023 Trung-Kien Nguyen, Zemin Liu, Yuan Fang

Assuming no type information is given, we define a so-called latent heterogeneous graph (LHG), which carries latent heterogeneous semantics as the node/edge types cannot be observed.

Link Prediction Representation Learning +1

GraphPrompt: Unifying Pre-Training and Downstream Tasks for Graph Neural Networks

2 code implementations16 Feb 2023 Zemin Liu, Xingtong Yu, Yuan Fang, Xinming Zhang

In particular, prompting is a popular alternative to fine-tuning in natural language processing, which is designed to narrow the gap between pre-training and downstream objectives in a task-specific manner.

Graph Representation Learning

On Generalized Degree Fairness in Graph Neural Networks

1 code implementation8 Feb 2023 Zemin Liu, Trung-Kien Nguyen, Yuan Fang

In particular, the varying neighborhood structures across nodes, manifesting themselves in drastically different node degrees, give rise to the diverse behaviors of nodes and biased outcomes.

Fairness Node Classification

Learning to Count Isomorphisms with Graph Neural Networks

1 code implementation7 Feb 2023 Xingtong Yu, Zemin Liu, Yuan Fang, Xinming Zhang

However, typical GNNs employ a node-centric message passing scheme that receives and aggregates messages on nodes, which is inadequate in complex structure matching for isomorphism counting.

Navigate

Modeling Price Elasticity for Occupancy Prediction in Hotel Dynamic Pricing

no code implementations4 Aug 2022 Fanwei Zhu, Wendong Xiao, Yao Yu, Ziyi Wang, Zulong Chen, Quan Lu, Zemin Liu, Minghui Wu, Shenghua Ni

Demand estimation plays an important role in dynamic pricing where the optimal price can be obtained via maximizing the revenue based on the demand curve.

Scalar is Not Enough: Vectorization-based Unbiased Learning to Rank

1 code implementation3 Jun 2022 Mouxiang Chen, Chenghao Liu, Zemin Liu, Jianling Sun

Most of the current ULTR methods are based on the examination hypothesis (EH), which assumes that the click probability can be factorized into two scalar functions, one related to ranking features and the other related to bias factors.

Learning-To-Rank

Node-wise Localization of Graph Neural Networks

1 code implementation27 Oct 2021 Zemin Liu, Yuan Fang, Chenghao Liu, Steven C. H. Hoi

Ideally, how a node receives its neighborhood information should be a function of its local context, to diverge from the global GNN model shared by all nodes.

Representation Learning

Count-GNN: Graph Neural Networks for Subgraph Isomorphism Counting

no code implementations29 Sep 2021 Xingtong Yu, Zemin Liu, Yuan Fang, Xinming Zhang

At the graph level, we modulate the graph representation conditioned on the query subgraph, so that the model can be adapted to each unique query for better matching with the input graph.

Navigate

Meta-Inductive Node Classification across Graphs

no code implementations14 May 2021 Zhihao Wen, Yuan Fang, Zemin Liu

That is, MI-GNN does not directly learn an inductive model; it learns the general knowledge of how to train a model for semi-supervised node classification on new graphs.

Classification General Knowledge +6

Topological Recurrent Neural Network for Diffusion Prediction

1 code implementation28 Nov 2017 Jia Wang, Vincent W. Zheng, Zemin Liu, Kevin Chen-Chuan Chang

As a result, we introduce a new data model, namely diffusion topologies, to fully describe the cascade structure.

Representation Learning

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