Search Results for author: Xiaochen Yang

Found 9 papers, 3 papers with code

Improving Transferability of Adversarial Examples via Bayesian Attacks

no code implementations21 Jul 2023 Qizhang Li, Yiwen Guo, Xiaochen Yang, WangMeng Zuo, Hao Chen

Our ICLR work advocated for enhancing transferability in adversarial examples by incorporating a Bayesian formulation into model parameters, which effectively emulates the ensemble of infinitely many deep neural networks, while, in this paper, we introduce a novel extension by incorporating the Bayesian formulation into the model input as well, enabling the joint diversification of both the model input and model parameters.

HAGEN: Homophily-Aware Graph Convolutional Recurrent Network for Crime Forecasting

no code implementations27 Sep 2021 Chenyu Wang, Zongyu Lin, Xiaochen Yang, Jiao Sun, Mingxuan Yue, Cyrus Shahabi

Based on the homophily assumption of GNN, we propose a homophily-aware constraint to regularize the optimization of the region graph so that neighboring region nodes on the learned graph share similar crime patterns, thus fitting the mechanism of diffusion convolution.

Crime Prediction Graph Learning

Deep Metric Learning for Few-Shot Image Classification: A Review of Recent Developments

no code implementations17 May 2021 Xiaoxu Li, Xiaochen Yang, Zhanyu Ma, Jing-Hao Xue

Few-shot image classification is a challenging problem that aims to achieve the human level of recognition based only on a small number of training images.

Classification Few-Shot Image Classification +3

Generalization Bound of Gradient Descent for Non-Convex Metric Learning

1 code implementation NeurIPS 2020 Mingzhi Dong, Xiaochen Yang, Rui Zhu, Yujiang Wang, Jing-Hao Xue

Metric learning aims to learn a distance measure that can benefit distance-based methods such as the nearest neighbour (NN) classifier.

Metric Learning

Information Theoretic Lower Bounds for Feed-Forward Fully-Connected Deep Networks

no code implementations1 Jul 2020 Xiaochen Yang, Jean Honorio

In this paper, we study the sample complexity lower bounds for the exact recovery of parameters and for a positive excess risk of a feed-forward, fully-connected neural network for binary classification, using information-theoretic tools.

Binary Classification

ReMarNet: Conjoint Relation and Margin Learning for Small-Sample Image Classification

1 code implementation27 Jun 2020 Xiaoxu Li, Liyun Yu, Xiaochen Yang, Zhanyu Ma, Jing-Hao Xue, Jie Cao, Jun Guo

Despite achieving state-of-the-art performance, deep learning methods generally require a large amount of labeled data during training and may suffer from overfitting when the sample size is small.

Classification General Classification +3

Towards Certified Robustness of Distance Metric Learning

1 code implementation10 Jun 2020 Xiaochen Yang, Yiwen Guo, Mingzhi Dong, Jing-Hao Xue

Many existing methods consider maximizing or at least constraining a distance margin in the feature space that separates similar and dissimilar pairs of instances to guarantee their generalization ability.

Metric Learning

Metric Learning via Maximizing the Lipschitz Margin Ratio

no code implementations9 Feb 2018 Mingzhi Dong, Xiaochen Yang, Yang Wu, Jing-Hao Xue

In this paper, we propose the Lipschitz margin ratio and a new metric learning framework for classification through maximizing the ratio.

Metric Learning

Learning Local Metrics and Influential Regions for Classification

no code implementations9 Feb 2018 Mingzhi Dong, Yujiang Wang, Xiaochen Yang, Jing-Hao Xue

The performance of distance-based classifiers heavily depends on the underlying distance metric, so it is valuable to learn a suitable metric from the data.

Classification General Classification +1

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