Search Results for author: Kenta Niwa

Found 13 papers, 3 papers with code

Optimal Transport with Cyclic Symmetry

no code implementations22 Nov 2023 Shoichiro Takeda, Yasunori Akagi, Naoki Marumo, Kenta Niwa

On the basis of this reduction, our algorithms solve the small optimization problem instead of the original OT.

Embarrassingly Simple Text Watermarks

1 code implementation13 Oct 2023 Ryoma Sato, Yuki Takezawa, Han Bao, Kenta Niwa, Makoto Yamada

LLMs can generate texts that cannot be distinguished from human-written texts.

Necessary and Sufficient Watermark for Large Language Models

no code implementations2 Oct 2023 Yuki Takezawa, Ryoma Sato, Han Bao, Kenta Niwa, Makoto Yamada

Although existing watermarking methods have successfully detected texts generated by LLMs, they significantly degrade the quality of the generated texts.

Machine Translation

Momentum Tracking: Momentum Acceleration for Decentralized Deep Learning on Heterogeneous Data

no code implementations30 Sep 2022 Yuki Takezawa, Han Bao, Kenta Niwa, Ryoma Sato, Makoto Yamada

In this study, we propose Momentum Tracking, which is a method with momentum whose convergence rate is proven to be independent of data heterogeneity.

Image Classification

Theoretical Analysis of Primal-Dual Algorithm for Non-Convex Stochastic Decentralized Optimization

no code implementations23 May 2022 Yuki Takezawa, Kenta Niwa, Makoto Yamada

However, the convergence rate of the ECL is provided only when the objective function is convex, and has not been shown in a standard machine learning setting where the objective function is non-convex.

Communication Compression for Decentralized Learning with Operator Splitting Methods

no code implementations8 May 2022 Yuki Takezawa, Kenta Niwa, Makoto Yamada

Moreover, we demonstrate that the C-ECL is more robust to heterogeneous data than the Gossip-based algorithms.

A DNN Optimizer that Improves over AdaBelief by Suppression of the Adaptive Stepsize Range

1 code implementation24 Mar 2022 Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn

Firstly, we show that the particular placement of the parameter epsilon within the update expressions of AdaBelief reduces the range of the adaptive stepsizes, making AdaBelief closer to SGD with momentum.

Image Classification Image Generation

Bilateral Video Magnification Filter

no code implementations CVPR 2022 Shoichiro Takeda, Kenta Niwa, Mariko Isogawa, Shinya Shimizu, Kazuki Okami, Yushi Aono

Eulerian video magnification (EVM) has progressed to magnify subtle motions with a target frequency even under the presence of large motions of objects.

Unity

SSFG: Stochastically Scaling Features and Gradients for Regularizing Graph Convolutional Networks

1 code implementation20 Feb 2021 Haimin Zhang, Min Xu, Guoqiang Zhang, Kenta Niwa

We show that applying stochastic scaling at the gradient level is complementary to that applied at the feature level to improve the overall performance.

Graph Learning

Approximated Orthonormal Normalisation in Training Neural Networks

no code implementations21 Nov 2019 Guo-Qiang Zhang, Kenta Niwa, W. B. Kleijn

Considering a weight matrix W from a particular neural layer in the model, our objective is to design a function h(W) such that its row vectors are approximately orthogonal to each other while allowing the DNN model to fit the training data sufficiently accurate.

Rapidly Adapting Moment Estimation

no code implementations24 Feb 2019 Guo-Qiang Zhang, Kenta Niwa, W. Bastiaan Kleijn

Adaptive gradient methods such as Adam have been shown to be very effective for training deep neural networks (DNNs) by tracking the second moment of gradients to compute the individual learning rates.

DNN-based Source Enhancement to Increase Objective Sound Quality Assessment Score

no code implementations22 Oct 2018 Yuma Koizumi, Kenta Niwa, Yusuke Hioka, Kazunori Kobayashi, Yoichi Haneda

Since OSQA scores have been used widely for sound-quality evaluation, constructing DNNs to increase OSQA scores would be better than using the minimum-MSE to create high-quality output signals.

GENERALIZED ADAPTIVE MOMENT ESTIMATION

no code implementations27 Sep 2018 Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn

Empirical studies for training four convolutional neural networks over MNIST and CIFAR10 show that under proper parameter selection, Game produces promising validation performance as compared to AMSGrad and PAdam.

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