Search Results for author: Ziyu Liu

Found 13 papers, 9 papers with code

RAR: Retrieving And Ranking Augmented MLLMs for Visual Recognition

1 code implementation20 Mar 2024 Ziyu Liu, Zeyi Sun, Yuhang Zang, Wei Li, Pan Zhang, Xiaoyi Dong, Yuanjun Xiong, Dahua Lin, Jiaqi Wang

Notably, our approach demonstrates a significant improvement in performance on 5 fine-grained visual recognition benchmarks, 11 few-shot image recognition datasets, and the 2 object detection datasets under the zero-shot recognition setting.

Contrastive Learning Fine-Grained Visual Recognition +3

Self-Supervised Learning for Time Series: Contrastive or Generative?

1 code implementation14 Mar 2024 Ziyu Liu, Azadeh Alavi, Minyi Li, Xiang Zhang

In this paper, we will present a comprehensive comparative study between contrastive and generative methods in time series.

Model Optimization Representation Learning +2

Introducing Shape Prior Module in Diffusion Model for Medical Image Segmentation

no code implementations12 Sep 2023 Zhiqing Zhang, Guojia Fan, Tianyong Liu, Nan Li, Yuyang Liu, Ziyu Liu, Canwei Dong, Shoujun Zhou

Furthermore, to capture specific anatomical a priori information in medical images, we incorporate a shape a priori module.

Anatomy Anomaly Detection +8

On Privacy and Personalization in Cross-Silo Federated Learning

1 code implementation16 Jun 2022 Ziyu Liu, Shengyuan Hu, Zhiwei Steven Wu, Virginia Smith

While the application of differential privacy (DP) has been well-studied in cross-device federated learning (FL), there is a lack of work considering DP and its implications for cross-silo FL, a setting characterized by a limited number of clients each containing many data subjects.

Federated Learning Multi-Task Learning

The Skellam Mechanism for Differentially Private Federated Learning

1 code implementation NeurIPS 2021 Naman Agarwal, Peter Kairouz, Ziyu Liu

We introduce the multi-dimensional Skellam mechanism, a discrete differential privacy mechanism based on the difference of two independent Poisson random variables.

Federated Learning

ECG-Based Heart Arrhythmia Diagnosis Through Attentional Convolutional Neural Networks

1 code implementation18 Aug 2021 Ziyu Liu, Xiang Zhang

Electrocardiography (ECG) signal is a highly applied measurement for individual heart condition, and much effort have been endeavored towards automatic heart arrhythmia diagnosis based on machine learning.

Arrhythmia Detection BIG-bench Machine Learning

The Distributed Discrete Gaussian Mechanism for Federated Learning with Secure Aggregation

1 code implementation12 Feb 2021 Peter Kairouz, Ziyu Liu, Thomas Steinke

To ensure privacy, we add on-device noise and use secure aggregation so that only the noisy sum is revealed to the server.

Federated Learning Quantization

LightMC: A Dynamic and Efficient Multiclass Decomposition Algorithm

no code implementations25 Aug 2019 Ziyu Liu, Guolin Ke, Jiang Bian, Tie-Yan Liu

Instead of using fixed coding matrix and decoding strategy, LightMC uses a differentiable decoding strategy, which enables it to dynamically optimize the coding matrix and decoding strategy, toward increasing the overall accuracy of multiclass classification, via back propagation jointly with the training of base learners in an iterative way.

Classification General Classification

Towards Understanding Chinese Checkers with Heuristics, Monte Carlo Tree Search, and Deep Reinforcement Learning

no code implementations5 Mar 2019 Ziyu Liu, Meng Zhou, Weiqing Cao, Qiang Qu, Henry Wing Fung Yeung, Vera Yuk Ying Chung

The game of Chinese Checkers is a challenging traditional board game of perfect information that differs from other traditional games in two main aspects: first, unlike Chess, all checkers remain indefinitely in the game and hence the branching factor of the search tree does not decrease as the game progresses; second, unlike Go, there are also no upper bounds on the depth of the search tree since repetitions and backward movements are allowed.

Reinforcement Learning (RL)

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