Search Results for author: Masatoshi Yoshikawa

Found 19 papers, 10 papers with code

ULDP-FL: Federated Learning with Across Silo User-Level Differential Privacy

1 code implementation23 Aug 2023 Fumiyuki Kato, Li Xiong, Shun Takagi, Yang Cao, Masatoshi Yoshikawa

In this study, we present Uldp-FL, a novel FL framework designed to guarantee user-level DP in cross-silo FL where a single user's data may belong to multiple silos.

Federated Learning

Local Differential Privacy Image Generation Using Flow-based Deep Generative Models

no code implementations20 Dec 2022 Hisaichi Shibata, Shouhei Hanaoka, Yang Cao, Masatoshi Yoshikawa, Tomomi Takenaga, Yukihiro Nomura, Naoto Hayashi, Osamu Abe

To release and use medical images, we need an algorithm that can simultaneously protect privacy and preserve pathologies in medical images.

Image Generation

Network Shuffling: Privacy Amplification via Random Walks

no code implementations8 Apr 2022 Seng Pei Liew, Tsubasa Takahashi, Shun Takagi, Fumiyuki Kato, Yang Cao, Masatoshi Yoshikawa

However, introducing a centralized entity to the originally local privacy model loses some appeals of not having any centralized entity as in local differential privacy.

OLIVE: Oblivious Federated Learning on Trusted Execution Environment against the risk of sparsification

1 code implementation15 Feb 2022 Fumiyuki Kato, Yang Cao, Masatoshi Yoshikawa

First, we theoretically analyze the leakage of memory access patterns, revealing the risk of sparsified gradients, which are commonly used in FL to enhance communication efficiency and model accuracy.

Federated Learning Inference Attack +1

ArchivalQA: A Large-scale Benchmark Dataset for Open Domain Question Answering over Historical News Collections

no code implementations8 Sep 2021 Jiexin Wang, Adam Jatowt, Masatoshi Yoshikawa

In the last few years, open-domain question answering (ODQA) has advanced rapidly due to the development of deep learning techniques and the availability of large-scale QA datasets.

Open-Domain Question Answering

Multi-TimeLine Summarization (MTLS): Improving Timeline Summarization by Generating Multiple Summaries

no code implementations ACL 2021 Yi Yu, Adam Jatowt, Antoine Doucet, Kazunari Sugiyama, Masatoshi Yoshikawa

In this paper, we address a novel task, Multiple TimeLine Summarization (MTLS), which extends the flexibility and versatility of Time-Line Summarization (TLS).

Timeline Summarization

Understanding the Interplay between Privacy and Robustness in Federated Learning

no code implementations13 Jun 2021 Yaowei Han, Yang Cao, Masatoshi Yoshikawa

Federated Learning (FL) is emerging as a promising paradigm of privacy-preserving machine learning, which trains an algorithm across multiple clients without exchanging their data samples.

Adversarial Robustness Federated Learning +1

FL-Market: Trading Private Models in Federated Learning

1 code implementation8 Jun 2021 Shuyuan Zheng, Yang Cao, Masatoshi Yoshikawa, Huizhong Li, Qiang Yan

FL-Market decouples ML from the need to centrally gather training data on the broker's side using federated learning, an emerging privacy-preserving ML paradigm in which data owners collaboratively train an ML model by uploading local gradients (to be aggregated into a global gradient for model updating).

Federated Learning Privacy Preserving

Quantifying the Privacy-Utility Trade-offs in COVID-19 Contact Tracing Apps

no code implementations24 Dec 2020 Patrick Ocheja, Yang Cao, Shiyao Ding, Masatoshi Yoshikawa

How to contain the spread of the COVID-19 virus is a major concern for most countries.

Computers and Society Cryptography and Security 68P27 H.3.4

FLAME: Differentially Private Federated Learning in the Shuffle Model

1 code implementation17 Sep 2020 Ruixuan Liu, Yang Cao, Hong Chen, Ruoyang Guo, Masatoshi Yoshikawa

In this work, by leveraging the \textit{privacy amplification} effect in the recently proposed shuffle model of differential privacy, we achieve the best of two worlds, i. e., accuracy in the curator model and strong privacy without relying on any trusted party.

Federated Learning

P3GM: Private High-Dimensional Data Release via Privacy Preserving Phased Generative Model

2 code implementations22 Jun 2020 Shun Takagi, Tsubasa Takahashi, Yang Cao, Masatoshi Yoshikawa

The state-of-the-art approach for this problem is to build a generative model under differential privacy, which offers a rigorous privacy guarantee.

Privacy Preserving

PGLP: Customizable and Rigorous Location Privacy through Policy Graph

3 code implementations4 May 2020 Yang Cao, Yonghui Xiao, Shun Takagi, Li Xiong, Masatoshi Yoshikawa, Yilin Shen, Jinfei Liu, Hongxia Jin, Xiaofeng Xu

Third, we design a private location trace release framework that pipelines the detection of location exposure, policy graph repair, and private trajectory release with customizable and rigorous location privacy.

Cryptography and Security Computers and Society

PANDA: Policy-aware Location Privacy for Epidemic Surveillance

3 code implementations1 May 2020 Yang Cao, Shun Takagi, Yonghui Xiao, Li Xiong, Masatoshi Yoshikawa

Our system has three primary functions for epidemic surveillance: location monitoring, epidemic analysis, and contact tracing.

Databases Cryptography and Security

Annotating and Analyzing Biased Sentences in News Articles using Crowdsourcing

no code implementations LREC 2020 Sora Lim, Adam Jatowt, Michael F{\"a}rber, Masatoshi Yoshikawa

In this paper, we propose a novel news bias dataset which facilitates the development and evaluation of approaches for detecting subtle bias in news articles and for understanding the characteristics of biased sentences.

Bias Detection Fake News Detection +1

FedSel: Federated SGD under Local Differential Privacy with Top-k Dimension Selection

no code implementations24 Mar 2020 Ruixuan Liu, Yang Cao, Masatoshi Yoshikawa, Hong Chen

To prevent privacy leakages from gradients that are calculated on users' sensitive data, local differential privacy (LDP) has been considered as a privacy guarantee in federated SGD recently.

Federated Learning

Beyond Narrative Description: Generating Poetry from Images by Multi-Adversarial Training

3 code implementations23 Apr 2018 Bei Liu, Jianlong Fu, Makoto P. Kato, Masatoshi Yoshikawa

Extensive experiments are conducted with 8K images, among which 1. 5K image are randomly picked for evaluation.

8k

Quantifying Differential Privacy in Continuous Data Release under Temporal Correlations

2 code implementations29 Nov 2017 Yang Cao, Masatoshi Yoshikawa, Yonghui Xiao, Li Xiong

Our analysis reveals that, the event-level privacy loss of a DP mechanism may \textit{increase over time}.

Databases

Quantifying Differential Privacy under Temporal Correlations

2 code implementations24 Oct 2016 Yang Cao, Masatoshi Yoshikawa, Yonghui Xiao, Li Xiong

Our analysis reveals that the privacy leakage of a DP mechanism may accumulate and increase over time.

Databases Cryptography and Security

Cannot find the paper you are looking for? You can Submit a new open access paper.