Kenta Niwa

95 papers A* 12A 1C 3Misc 20Journal 46Unranked 13
YearRankTypeTitle / Venue / Authors
2026 A* conf
FedPM: Federated Learning Using Second-order Optimization with Preconditioned Mixing of Local Parameters.
AAAI
Hiro Ishii, Kenta Niwa, Hiroshi Sawada, Akinori Fujino, Noboru Harada, Rio Yokota
2025 J jnl
Adaptive Clipping for Differential Private Federated Learning in Interpolation Regimes.
Trans. Mach. Learn. Res.
Takumi Fukami, Tomoya Murata, Kenta Niwa
2025 J jnl
FedPM: Federated Learning Using Second-order Optimization with Preconditioned Mixing of Local Parameters.
CoRR
Hiro Ishii, Kenta Niwa, Hiroshi Sawada, Akinori Fujino, Noboru Harada, Rio Yokota
2025 J jnl
High Quality Diffusion Distillation on a Single GPU with Relative and Absolute Position Matching.
CoRR
Guoqiang Zhang, Kenta Niwa, John P. Lewis, Cédric Mesnage, W. Bastiaan Kleijn
2025 J jnl
Necessary and Sufficient Watermark for Large Language Models.
Trans. Mach. Learn. Res.
Yuki Takezawa, Ryoma Sato, Han Bao, Kenta Niwa, Makoto Yamada
2025 J jnl
NeurIPS 2023 Competition: Privacy Preserving Federated Learning Document VQA.
Trans. Mach. Learn. Res.
Marlon Tobaben, Mohamed Ali Souibgui, Rubèn Tito, Khanh Nguyen, Raouf Kerkouche, Kangsoo Jung, Joonas Jälkö, Lei Kang, Andrey Barsky, Vincent Poulain D'Andecy, Aurélie Joseph, Aashiq Muhamed, Kevin Kuo, Virginia Smith, Yusuke Yamasaki, Takumi Fukami, Kenta Niwa, Iifan Tyou, Hiro Ishii, Rio Yokota, Ragul N, Rintu Kutum, Josep Lladós, Ernest Valveny, Antti Honkela, Mario Fritz, Dimosthenis Karatzas
2025 A* conf
Plausible Token Amplification for Improving Accuracy of Differentially Private In-Context Learning Based on Implicit Bayesian Inference.
ICML
Yusuke Yamasaki, Kenta Niwa, Daiki Chijiwa, Takumi Fukami, Takayuki Miura
2024 J jnl
A Localized Primal-Dual Method for Centralized/Decentralized Federated Learning Robust to Data Heterogeneity.
IEEE Trans. Signal Inf. Process. over Networks
Iifan Tyou, Tomoya Murata, Takumi Fukami, Yuki Takezawa, Kenta Niwa
2024 J jnl
DP-Norm: Differential Privacy Primal-Dual Algorithm for Decentralized Federated Learning.
IEEE Trans. Inf. Forensics Secur.
Takumi Fukami, Tomoya Murata, Kenta Niwa, Iifan Tyou
2024 J jnl
Natural Gradient Primal-Dual Method for Decentralized Learning.
IEEE Trans. Signal Inf. Process. over Networks
Kenta Niwa, Hiro Ishii, Hiroshi Sawada, Akinori Fujino, Noboru Harada, Rio Yokota
2024 J jnl
NeurIPS 2023 Competition: Privacy Preserving Federated Learning Document VQA.
CoRR
Marlon Tobaben, Mohamed Ali Souibgui, Rubèn Tito, Khanh Nguyen, Raouf Kerkouche, Kangsoo Jung, Joonas Jälkö, Lei Kang, Andrey Barsky, Vincent Poulain D'Andecy, Aurélie Joseph, Aashiq Muhamed, Kevin Kuo, Virginia Smith, Yusuke Yamasaki, Takumi Fukami, Kenta Niwa, Iifan Tyou, Hiro Ishii, Rio Yokota, Ragul N, Rintu Kutum, Josep Lladós, Ernest Valveny, Antti Honkela, Mario Fritz, Dimosthenis Karatzas
2024 A* conf
On Accelerating Diffusion-Based Sampling Processes via Improved Integration Approximation.
ICLR
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2024 A* conf
Optimal Transport with Cyclic Symmetry.
AAAI
Shoichiro Takeda, Yasunori Akagi, Naoki Marumo, Kenta Niwa
2024 A* conf
Parameter-free Clipped Gradient Descent Meets Polyak.
NeurIPS
Yuki Takezawa, Han Bao, Ryoma Sato, Kenta Niwa, Makoto Yamada
2024 J jnl
Polyak Meets Parameter-free Clipped Gradient Descent.
CoRR
Yuki Takezawa, Han Bao, Ryoma Sato, Kenta Niwa, Makoto Yamada
2024 J jnl
SSFG: Stochastically Scaling Features and Gradients for Regularizing Graph Convolutional Networks.
IEEE Trans. Neural Networks Learn. Syst.
Haimin Zhang, Min Xu, Guoqiang Zhang, Kenta Niwa
2024 A* conf
Simple Minimax Optimal Byzantine Robust Algorithm for Nonconvex Objectives with Uniform Gradient Heterogeneity.
ICLR
Tomoya Murata, Kenta Niwa, Takumi Fukami, Iifan Tyou
2023 J jnl
A DNN Optimizer that Improves over AdaBelief by Suppression of the Adaptive Stepsize Range.
Trans. Mach. Learn. Res.
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2023 A* conf
Beyond Exponential Graph: Communication-Efficient Topologies for Decentralized Learning via Finite-time Convergence.
NeurIPS
Yuki Takezawa, Ryoma Sato, Han Bao, Kenta Niwa, Makoto Yamada
2023 J jnl
Beyond Exponential Graph: Communication-Efficient Topologies for Decentralized Learning via Finite-time Convergence.
CoRR
Yuki Takezawa, Ryoma Sato, Han Bao, Kenta Niwa, Makoto Yamada
2023 J jnl
Communication Compression for Decentralized Learning With Operator Splitting Methods.
IEEE Trans. Signal Inf. Process. over Networks
Yuki Takezawa, Kenta Niwa, Makoto Yamada
2023 J jnl
CoordiNet: Constrained Dynamics Learning for State Coordination Over Graph.
IEEE Trans. Signal Inf. Process. over Networks
Kenta Niwa, Naonori Ueda, Hiroshi Sawada, Akinori Fujino, Shoichiro Takeda, Guoqiang Zhang, W. Bastiaan Kleijn
2023 J jnl
Embarrassingly Simple Text Watermarks.
CoRR
Ryoma Sato, Yuki Takezawa, Han Bao, Kenta Niwa, Makoto Yamada
2023 A* conf
Lookahead Diffusion Probabilistic Models for Refining Mean Estimation.
CVPR
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2023 J jnl
Lookahead Diffusion Probabilistic Models for Refining Mean Estimation.
CoRR
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2023 J jnl
Momentum Tracking: Momentum Acceleration for Decentralized Deep Learning on Heterogeneous Data.
Trans. Mach. Learn. Res.
Yuki Takezawa, Han Bao, Kenta Niwa, Ryoma Sato, Makoto Yamada
2023 J jnl
Necessary and Sufficient Watermark for Large Language Models.
CoRR
Yuki Takezawa, Ryoma Sato, Han Bao, Kenta Niwa, Makoto Yamada
2023 J jnl
On Accelerating Diffusion-Based Sampling Process via Improved Integration Approximation.
CoRR
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2023 J jnl
Optimal Transport with Cyclic Symmetry.
CoRR
Shoichiro Takeda, Yasunori Akagi, Naoki Marumo, Kenta Niwa
2022 A* conf
Bilateral Video Magnification Filter.
CVPR
Shoichiro Takeda, Kenta Niwa, Mariko Isogawa, Shinya Shimizu, Kazuki Okami, Yushi Aono
2022 J jnl
Communication Compression for Decentralized Learning with Operator Splitting Methods.
CoRR
Yuki Takezawa, Kenta Niwa, Makoto Yamada
2022 J jnl
Momentum Tracking: Momentum Acceleration for Decentralized Deep Learning on Heterogeneous Data.
CoRR
Yuki Takezawa, Han Bao, Kenta Niwa, Ryoma Sato, Makoto Yamada
2022 J jnl
On Exploiting Layerwise Gradient Statistics for Effective Training of Deep Neural Networks.
CoRR
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2022 J jnl
Revisiting the Primal-Dual Method of Multipliers for Optimisation Over Centralised Networks.
IEEE Trans. Signal Inf. Process. over Networks
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2022 J jnl
Theoretical Analysis of Primal-Dual Algorithm for Non-Convex Stochastic Decentralized Optimization.
CoRR
Yuki Takezawa, Kenta Niwa, Makoto Yamada
2021 J jnl
Ambisonic Signal Processing DNNs Guaranteeing Rotation, Scale and Time Translation Equivariance.
IEEE ACM Trans. Audio Speech Lang. Process.
Ryotaro Sato, Kenta Niwa, Kazunori Kobayashi
2021 A* conf
Asynchronous Decentralized Optimization With Implicit Stochastic Variance Reduction.
ICML
Kenta Niwa, Guoqiang Zhang, W. Bastiaan Kleijn, Noboru Harada, Hiroshi Sawada, Akinori Fujino
2021 J jnl
Extending AdamW by Leveraging Its Second Moment and Magnitude.
CoRR
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2021 — conf
Loudspeaker Array to Maximize Acoustic Contrast Using Proximal Splitting Method.
EUSIPCO
Kenta Imaizumi, Kenta Niwa, Kimitaka Tsutsumi
2021 J jnl
Revisiting the Primal-Dual Method of Multipliers for Optimisation over Centralised Networks.
CoRR
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2020 — conf
Differentiable Max-Directivity Beamforming Normalization for Independent Vector Analysis.
EUSIPCO
Shoichiro Takeda, Kenta Niwa, Shinya Shimizu
2020 A* conf
Edge-consensus Learning: Deep Learning on P2P Networks with Nonhomogeneous Data.
KDD
Kenta Niwa, Noboru Harada, Guoqiang Zhang, W. Bastiaan Kleijn
2020 J jnl
Microphone Array Wiener Post Filtering Using Monotone Operator Splitting.
IEEE ACM Trans. Audio Speech Lang. Process.
Kenta Niwa, Hironobu Chiba, Noboru Harada, Guoqiang Zhang, W. Bastiaan Kleijn
2020 Misc conf
Projected Weight Regularization to Improve Neural Network Generalization.
ICASSP
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2019 J jnl
Approximated Orthonormal Normalisation in Training Neural Networks.
CoRR
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2019 Misc conf
Fast Edge-consensus Computing Based on Bregman Monotone Operator Splitting.
ICASSP
Kenta Niwa, Guoqiang Zhang, W. Bastiaan Kleijn
2019 Misc conf
Function Designable Beamformer Based on Probabilistic Assumptions on Filter and Its Auxiliary Variables.
ICASSP
Ryotaro Sato, Kenta Niwa, Noboru Harada
2019 C conf
Improving speech intelligibility using microphones on behind the ear hearing aids.
MMSP
Yusuke Hioka, Kei Kobayashi, Kenta Niwa
2019 Misc conf
Non-negative Matrix Factorization Using Bregman Monotone Operator Splitting.
ICASSP
Kenta Niwa, Noboru Harada
2019 J jnl
Rapidly Adapting Moment Estimation.
CoRR
Guoqiang Zhang, Kenta Niwa, W. Bastiaan Kleijn
2018 J jnl
DNN-Based Source Enhancement to Increase Objective Sound Quality Assessment Score.
IEEE ACM Trans. Audio Speech Lang. Process.
Yuma Koizumi, Kenta Niwa, Yusuke Hioka, Kazunori Kobayashi, Yoichi Haneda
2018 J jnl
DNN-based Source Enhancement to Increase Objective Sound Quality Assessment Score.
CoRR
Yuma Koizumi, Kenta Niwa, Yusuke Hioka, Kazunori Kobayashi, Yoichi Haneda
2018 — conf
Edge Consensus Computing for Heterogeneous Data Sets.
SSP
Kenta Niwa, Guoqiang Zhang, W. Bastiaan Kleijn
2018 J jnl
Efficient Audio Rendering Using Angular Region-Wise Source Enhancement for 360° Video.
IEEE Trans. Multim.
Kenta Niwa, Yusuke Hioka, Hisashi Uematsu
2017 J jnl
A Single-Dimensional Interface for Arranging Multiple Audio Sources in Three-Dimensional Space.
IEICE Trans. Inf. Syst.
Kento Ohtani, Kenta Niwa, Kazuya Takeda
2017 Misc conf
DNN-based source enhancement self-optimized by reinforcement learning using sound quality measurements.
ICASSP
Yuma Koizumi, Kenta Niwa, Yusuke Hioka, Kazunori Kobayashi, Yoichi Haneda
2017 J jnl
Informative Acoustic Feature Selection to Maximize Mutual Information for Collecting Target Sources.
IEEE ACM Trans. Audio Speech Lang. Process.
Yuma Koizumi, Kenta Niwa, Yusuke Hioka, Kazunori Kobayashi, Hitoshi Ohmuro
2017 J jnl
Integration of Spatial Cue-Based Noise Reduction and Speech Model-Based Source Restoration for Real Time Speech Enhancement.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Tomoko Kawase, Kenta Niwa, Masakiyo Fujimoto, Kazunori Kobayashi, Shoko Araki, Tomohiro Nakatani
2017 Misc conf
Music staging AI.
ICASSP
Kenta Niwa, Kento Ohtani, Kazuya Takeda
2017 J jnl
Software Defined Media: Virtualization of Audio-Visual Services.
CoRR
Manabu Tsukada, Keiko Ogawa, Masahiro Ikeda, Takuro Sone, Kenta Niwa, Shoichiro Saito, Takashi Kasuya, Hideki Sunahara, Hiroshi Esaki
2017 — conf
Software defined media: Virtualization of audio-visual services.
ICC
Manabu Tsukada, Keiko Ogawa, Masahiro Ikeda, Takuro Sone, Kenta Niwa, Shoichiro Saito, Takashi Kasuya, Hideki Sunahara, Hiroshi Esaki
2017 Misc conf
Supervised source enhancement composed of nonnegative auto-encoders and complementarity subtraction.
ICASSP
Kenta Niwa, Yuma Koizumi, Tomoko Kawase, Kazunori Kobayashi, Yusuke Hioka
2016 — conf
Application of neural network to source PSD estimation for wiener filter based array sound source enhancement.
IWAENC
Tomoko Kawase, Kenta Niwa, Kazunori Kobayashi, Yusuke Hioka
2016 Misc conf
Binaural sound generation corresponding to omnidirectional video view using angular region-wise source enhancement.
ICASSP
Kenta Niwa, Yuma Koizumi, Kazunori Kobayashi, Hisashi Uematsu
2016 Misc conf
Estimating direct-to-reverberant ratio mapped from power spectral density using deep neural network.
ICASSP
Yusuke Hioka, Kenta Niwa
2016 Misc conf
Integrated approach of feature extraction and sound source enhancement based on maximization of mutual information.
ICASSP
Yuma Koizumi, Kenta Niwa, Yusuke Hioka, Kazunori Kobayashi, Hitoshi Ohmuro
2016 J jnl
Optimal Microphone Array Observation for Clear Recording of Distant Sound Sources.
IEEE ACM Trans. Audio Speech Lang. Process.
Kenta Niwa, Yusuke Hioka, Kazunori Kobayashi
2016 — conf
PSD estimation in beamspace using property of M-matrix.
IWAENC
Kenta Niwa, Tomoko Kawase, Kazunori Kobayashi, Yusuke Hioka
2016 Misc conf
Pinpoint extraction of distant sound source based on DNN mapping from multiple beamforming outputs to prior SNR.
ICASSP
Kenta Niwa, Yuma Koizumi, Tomoko Kawase, Kazunori Kobayashi, Yusuke Hioka
2016 Misc conf
Real-time integration of statistical model-based speech enhancement with unsupervised noise PSD estimation using microphone array.
ICASSP
Tomoko Kawase, Kenta Niwa, Masakiyo Fujimoto, Noriyoshi Kamado, Kazunori Kobayashi, Shoko Araki, Tomohiro Nakatani
2015 A* conf
Dive into Remote Events: Omnidirectional Video Streaming with Acoustic Immersion.
ACM Multimedia
Daisuke Ochi, Kenta Niwa, Akio Kameda, Yutaka Kunita, Akira Kojima
2015 — conf
Informative acoustic feature selection on microphone array wiener filtering for collecting target source on sports ground.
WASPAA
Yuma Koizumi, Kenta Niwa, Yusuke Hioka, Kazunori Kobayashi, Hitoshi Ohmuro
2015 Misc conf
Microphone array for increasing mutual information between sound sources and observation signals.
ICASSP
Kenta Niwa, Tatsuya Kako, Kazunori Kobayashi
2015 — conf
Optimization of grasp positions using the partial differentiation of the grasp stiffness matrix.
SII
Kenta Niwa, Takayoshi Yamada, Hidehiko Yamamoto, Haruhisa Kawasaki, Tetsuya Mouri
2015 J jnl
PSD estimation in Beamspace for Estimating Direct-to-Reverberant Ratio from A Reverberant Speech Signal.
CoRR
Yusuke Hioka, Kenta Niwa
2015 — conf
Wiener filter design by estimating sensitivities between distributed asynchronous microphones and sound sources.
WASPAA
Tatsuya Kako, Kenta Niwa, Kazunori Kobayashi, Hitoshi Ohmuro
2014 Misc conf
Close-talking spherical microphone array using sound pressure interpolation based on spherical harmonic expansion.
ICASSP
Yoichi Haneda, Ken'ichi Furuya, Shoichi Koyama, Kenta Niwa
2014 — conf
PSD estimation in beamspace for source separation in a diffuse noise field.
IWAENC
Yusuke Hioka, Kenta Niwa
2014 — conf
Post-filter design for speech enhancement in various noisy environments.
IWAENC
Kenta Niwa, Yusuke Hioka, Kazunori Kobayashi
2013 J jnl
An Estimation Method of Sound Source Orientation Using Eigenspace Variation of Spatial Correlation Matrix.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kenta Niwa, Yusuke Hioka, Sumitaka Sakauchi, Ken'ichi Furuya, Yoichi Haneda
2013 J jnl
Diffused Sensing for Sharp Directive Beamforming.
IEEE Trans. Speech Audio Process.
Kenta Niwa, Yusuke Hioka, Ken'ichi Furuya, Yoichi Haneda
2013 — conf
Evaluation of microphone array based on diffused sensing with various filter design methods.
EUSIPCO
Kenta Niwa, Yusuke Hioka, Kazunori Kobayashi, Ken'ichi Furuya, Yoichi Haneda
2013 J jnl
Underdetermined Sound Source Separation Using Power Spectrum Density Estimated by Combination of Directivity Gain.
IEEE Trans. Speech Audio Process.
Yusuke Hioka, Ken'ichi Furuya, Kazunori Kobayashi, Kenta Niwa, Yoichi Haneda
2013 A conf
Wave intensity estimation over broad wavelengths based on diffused sensing.
ICST
Kenta Niwa, Yusuke Hioka, Kazunori Kobayashi
2012 Misc conf
Diffused sensing for sharp directivity microphone array.
ICASSP
Kenta Niwa, Sumitaka Sakauchi, Ken'ichi Furuya, Manabu Okamoto, Yoichi Haneda
2012 Misc conf
Estimating sound source depth using a small-size array.
ICASSP
Satoshi Esaki, Kenta Niwa, Takanori Nishino, Kazuya Takeda
2012 — conf
Estimation of Direct-to-Reverberation Energy Ratio Based On Isotropic and Homogeneous Propagation Model.
IWAENC
Yusuke Hioka, Ken'ichi Furuya, Kenta Niwa, Yoichi Haneda
2012 C conf
Superdirective beamforming using microphone array and single reflector.
ICCE
Kenta Niwa, Sumitaka Sakauchi, Ken'ichi Furuya, Manabu Okamoto, Yoichi Haneda
2012 Misc conf
Telescopic microphone array using reflector for segregating target source from noises in same direction.
ICASSP
Kenta Niwa, Yusuke Hioka, Sumitaka Sakauchi, Ken'ichi Furuya, Yoichi Haneda
2011 J jnl
Estimating Direct-to-Reverberant Energy Ratio Using D/R Spatial Correlation Matrix Model.
IEEE ACM Trans. Audio Speech Lang. Process.
Yusuke Hioka, Kenta Niwa, Sumitaka Sakauchi, Ken'ichi Furuya, Youichi Haneda
2010 Misc conf
Estimating direct-to-reverberant energy ratio based on spatial correlation model segregating direct sound and reverberation.
ICASSP
Yusuke Hioka, Kenta Niwa, Sumitaka Sakauchi, Ken'ichi Furuya, Youichi Haneda
2010 Misc conf
Estimation of sound source orientation using eigenspace of spatial correlation matrix.
ICASSP
Kenta Niwa, Yusuke Hioka, Sumitaka Sakauchi, Ken'ichi Furuya, Youichi Haneda
2009 J jnl
Selective Listening Point Audio Based on Blind Signal Separation and Stereophonic Technology.
IEICE Trans. Inf. Syst.
Kenta Niwa, Takanori Nishino, Kazuya Takeda
2008 C conf
3DAV integrated system featuring arbitrary listening-point and viewpoint generation.
MMSP
Mehrdad Panahpour Tehrani, Kenta Niwa, Norishige Fukushima, Yasushi Hirano, Toshiaki Fujii, Masayuki Tanimoto, Kazuya Takeda, Kenji Mase, Akio Ishikawa, Shigeyuki Sakazawa, Atsushi Koike
2008 Misc conf
Encoding large array signals into a 3D sound field representation for selective listening point audio based on blind source separation.
ICASSP
Kenta Niwa, Takanori Nishino, Kazuya Takeda