Search Results for author: Ka-Ho Chow

Found 21 papers, 12 papers with code

On the Efficiency of Privacy Attacks in Federated Learning

no code implementations15 Apr 2024 Nawrin Tabassum, Ka-Ho Chow, Xuyu Wang, Wenbin Zhang, Yanzhao Wu

Second, we propose three early-stopping techniques to effectively reduce the computational costs of these privacy attacks.

Federated Learning

Robust Few-Shot Ensemble Learning with Focal Diversity-Based Pruning

2 code implementations5 Apr 2024 Selim Furkan Tekin, Fatih Ilhan, Tiansheng Huang, Sihao Hu, Ka-Ho Chow, Margaret L. Loper, Ling Liu

This paper presents FusionShot, a focal diversity optimized few-shot ensemble learning approach for boosting the robustness and generalization performance of pre-trained few-shot models.

Ensemble Learning Ensemble Pruning +1

A Survey of Privacy Threats and Defense in Vertical Federated Learning: From Model Life Cycle Perspective

no code implementations6 Feb 2024 Lei Yu, Meng Han, Yiming Li, Changting Lin, Yao Zhang, Mingyang Zhang, Yan Liu, Haiqin Weng, Yuseok Jeon, Ka-Ho Chow, Stacy Patterson

Vertical Federated Learning (VFL) is a federated learning paradigm where multiple participants, who share the same set of samples but hold different features, jointly train machine learning models.

Vertical Federated Learning

Imperio: Language-Guided Backdoor Attacks for Arbitrary Model Control

no code implementations2 Jan 2024 Ka-Ho Chow, Wenqi Wei, Lei Yu

This paper proposes Imperio, which harnesses the language understanding capabilities of NLP models to enrich backdoor attacks.

Backdoor Attack Image Classification +1

Hierarchical Pruning of Deep Ensembles with Focal Diversity

1 code implementation17 Nov 2023 Yanzhao Wu, Ka-Ho Chow, Wenqi Wei, Ling Liu

This paper presents a novel deep ensemble pruning approach, which can efficiently identify smaller deep ensembles and provide higher ensemble accuracy than the entire deep ensemble of a large number of member networks.

Decision Making Ensemble Pruning

Exploring Model Learning Heterogeneity for Boosting Ensemble Robustness

1 code implementation3 Oct 2023 Yanzhao Wu, Ka-Ho Chow, Wenqi Wei, Ling Liu

We show that this two-tier heterogeneity driven ensemble construction method can compose an ensemble team that promotes high ensemble diversity and low negative correlation among member models of the ensemble, strengthening ensemble robustness against both negative examples and adversarial attacks.

object-detection Object Detection +1

Securing Distributed SGD against Gradient Leakage Threats

1 code implementation10 May 2023 Wenqi Wei, Ling Liu, Jingya Zhou, Ka-Ho Chow, Yanzhao Wu

Next, we present a gradient leakage resilient approach to securing distributed SGD in federated learning, with differential privacy controlled noise as the tool.

Federated Learning

STDLens: Model Hijacking-Resilient Federated Learning for Object Detection

1 code implementation CVPR 2023 Ka-Ho Chow, Ling Liu, Wenqi Wei, Fatih Ilhan, Yanzhao Wu

Based on the insights, we introduce a three-tier forensic framework to identify and expel Trojaned gradients and reclaim the performance over the course of FL.

Federated Learning object-detection +1

Adaptive Deep Neural Network Inference Optimization with EENet

1 code implementation15 Jan 2023 Fatih Ilhan, Ka-Ho Chow, Sihao Hu, Tiansheng Huang, Selim Tekin, Wenqi Wei, Yanzhao Wu, Myungjin Lee, Ramana Kompella, Hugo Latapie, Gaowen Liu, Ling Liu

Instead of having every sample go through all DNN layers during prediction, EENet learns an early exit scheduler, which can intelligently terminate the inference earlier for certain predictions, which the model has high confidence of early exit.

Inference Optimization Scheduling +1

Boosting Ensemble Accuracy by Revisiting Ensemble Diversity Metrics

1 code implementation CVPR 2021 Yanzhao Wu, Ling Liu, Zhongwei Xie, Ka-Ho Chow, Wenqi Wei

Our new metrics significantly improve the intrinsic correlation between high ensemble diversity and high ensemble accuracy.

Ensemble Learning Ensemble Pruning +1

Understanding Object Detection Through An Adversarial Lens

1 code implementation11 Jul 2020 Ka-Ho Chow, Ling Liu, Mehmet Emre Gursoy, Stacey Truex, Wenqi Wei, Yanzhao Wu

We demonstrate that the proposed framework can serve as a methodical benchmark for analyzing adversarial behaviors and risks in real-time object detection systems.

Adversarial Robustness Autonomous Vehicles +3

LDP-Fed: Federated Learning with Local Differential Privacy

no code implementations5 Jun 2020 Stacey Truex, Ling Liu, Ka-Ho Chow, Mehmet Emre Gursoy, Wenqi Wei

However, in federated learning model parameter updates are collected iteratively from each participant and consist of high dimensional, continuous values with high precision (10s of digits after the decimal point), making existing LDP protocols inapplicable.

Federated Learning

A Framework for Evaluating Gradient Leakage Attacks in Federated Learning

2 code implementations22 Apr 2020 Wenqi Wei, Ling Liu, Margaret Loper, Ka-Ho Chow, Mehmet Emre Gursoy, Stacey Truex, Yanzhao Wu

FL offers default client privacy by allowing clients to keep their sensitive data on local devices and to only share local training parameter updates with the federated server.

Federated Learning

TOG: Targeted Adversarial Objectness Gradient Attacks on Real-time Object Detection Systems

2 code implementations9 Apr 2020 Ka-Ho Chow, Ling Liu, Mehmet Emre Gursoy, Stacey Truex, Wenqi Wei, Yanzhao Wu

The rapid growth of real-time huge data capturing has pushed the deep learning and data analytic computing to the edge systems.

Autonomous Driving Object +4

Deep Neural Network Ensembles against Deception: Ensemble Diversity, Accuracy and Robustness

no code implementations29 Aug 2019 Ling Liu, Wenqi Wei, Ka-Ho Chow, Margaret Loper, Emre Gursoy, Stacey Truex, Yanzhao Wu

In this paper we first give an overview of the concept of ensemble diversity and examine the three types of ensemble diversity in the context of DNN classifiers.

Ensemble Learning

Denoising and Verification Cross-Layer Ensemble Against Black-box Adversarial Attacks

no code implementations21 Aug 2019 Ka-Ho Chow, Wenqi Wei, Yanzhao Wu, Ling Liu

Deep neural networks (DNNs) have demonstrated impressive performance on many challenging machine learning tasks.

Denoising

DA-LSTM: A Long Short-Term Memory with Depth Adaptive to Non-uniform Information Flow in Sequential Data

no code implementations18 Jan 2019 Yifeng Zhang, Ka-Ho Chow, S. -H. Gary Chan

In this paper, we develop a Depth-Adaptive Long Short-Term Memory (DA-LSTM) architecture, which can dynamically adjust the structure depending on information distribution without prior knowledge.

Representation Learning of Pedestrian Trajectories Using Actor-Critic Sequence-to-Sequence Autoencoder

no code implementations20 Nov 2018 Ka-Ho Chow, Anish Hiranandani, Yifeng Zhang, S. -H. Gary Chan

Representation learning of pedestrian trajectories transforms variable-length timestamp-coordinate tuples of a trajectory into a fixed-length vector representation that summarizes spatiotemporal characteristics.

Representation Learning

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