Search Results for author: Chenxiao Yang

Found 13 papers, 9 papers with code

Graph Out-of-Distribution Generalization via Causal Intervention

1 code implementation18 Feb 2024 Qitian Wu, Fan Nie, Chenxiao Yang, TianYi Bao, Junchi Yan

In this paper, we adopt a bottom-up data-generative perspective and reveal a key observation through causal analysis: the crux of GNNs' failure in OOD generalization lies in the latent confounding bias from the environment.

Causal Inference Out-of-Distribution Generalization

Advective Diffusion Transformers for Topological Generalization in Graph Learning

no code implementations10 Oct 2023 Qitian Wu, Chenxiao Yang, Kaipeng Zeng, Fan Nie, Michael Bronstein, Junchi Yan

Graph diffusion equations are intimately related to graph neural networks (GNNs) and have recently attracted attention as a principled framework for analyzing GNN dynamics, formalizing their expressive power, and justifying architectural choices.

Graph Learning

How Graph Neural Networks Learn: Lessons from Training Dynamics

no code implementations8 Oct 2023 Chenxiao Yang, Qitian Wu, David Wipf, Ruoyu Sun, Junchi Yan

A long-standing goal in deep learning has been to characterize the learning behavior of black-box models in a more interpretable manner.

Inductive Bias

GraphGLOW: Universal and Generalizable Structure Learning for Graph Neural Networks

1 code implementation20 Jun 2023 Wentao Zhao, Qitian Wu, Chenxiao Yang, Junchi Yan

Graph structure learning is a well-established problem that aims at optimizing graph structures adaptive to specific graph datasets to help message passing neural networks (i. e., GNNs) to yield effective and robust node embeddings.

Graph structure learning

Energy-based Out-of-Distribution Detection for Graph Neural Networks

1 code implementation6 Feb 2023 Qitian Wu, Yiting Chen, Chenxiao Yang, Junchi Yan

This paves a way for a simple, powerful and efficient OOD detection model for GNN-based learning on graphs, which we call GNNSafe.

Out-of-Distribution Detection Out of Distribution (OOD) Detection

DIFFormer: Scalable (Graph) Transformers Induced by Energy Constrained Diffusion

1 code implementation23 Jan 2023 Qitian Wu, Chenxiao Yang, Wentao Zhao, Yixuan He, David Wipf, Junchi Yan

Real-world data generation often involves complex inter-dependencies among instances, violating the IID-data hypothesis of standard learning paradigms and posing a challenge for uncovering the geometric structures for learning desired instance representations.

Image-text Classification Node Classification +2

Graph Neural Networks are Inherently Good Generalizers: Insights by Bridging GNNs and MLPs

1 code implementation18 Dec 2022 Chenxiao Yang, Qitian Wu, Jiahua Wang, Junchi Yan

Graph neural networks (GNNs), as the de-facto model class for representation learning on graphs, are built upon the multi-layer perceptrons (MLP) architecture with additional message passing layers to allow features to flow across nodes.

Representation Learning

Geometric Knowledge Distillation: Topology Compression for Graph Neural Networks

2 code implementations24 Oct 2022 Chenxiao Yang, Qitian Wu, Junchi Yan

We study a new paradigm of knowledge transfer that aims at encoding graph topological information into graph neural networks (GNNs) by distilling knowledge from a teacher GNN model trained on a complete graph to a student GNN model operating on a smaller or sparser graph.

Knowledge Distillation Transfer Learning

Towards Out-of-Distribution Sequential Event Prediction: A Causal Treatment

1 code implementation24 Oct 2022 Chenxiao Yang, Qitian Wu, Qingsong Wen, Zhiqiang Zhou, Liang Sun, Junchi Yan

The goal of sequential event prediction is to estimate the next event based on a sequence of historical events, with applications to sequential recommendation, user behavior analysis and clinical treatment.

Sequential Recommendation Variational Inference

Trading Hard Negatives and True Negatives: A Debiased Contrastive Collaborative Filtering Approach

no code implementations25 Apr 2022 Chenxiao Yang, Qitian Wu, Jipeng Jin, Xiaofeng Gao, Junwei Pan, Guihai Chen

To circumvent false negatives, we develop a principled approach to improve the reliability of negative instances and prove that the objective is an unbiased estimation of sampling from the true negative distribution.

Collaborative Filtering

Cross-Task Knowledge Distillation in Multi-Task Recommendation

no code implementations20 Feb 2022 Chenxiao Yang, Junwei Pan, Xiaofeng Gao, Tingyu Jiang, Dapeng Liu, Guihai Chen

Multi-task learning (MTL) has been widely used in recommender systems, wherein predicting each type of user feedback on items (e. g, click, purchase) are treated as individual tasks and jointly trained with a unified model.

Knowledge Distillation Multi-Task Learning +1

Towards Open-World Feature Extrapolation: An Inductive Graph Learning Approach

1 code implementation NeurIPS 2021 Qitian Wu, Chenxiao Yang, Junchi Yan

We target open-world feature extrapolation problem where the feature space of input data goes through expansion and a model trained on partially observed features needs to handle new features in test data without further retraining.

Graph Learning

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