Search Results for author: Hiroshi Kera

Found 23 papers, 5 papers with code

Matching Non-Identical Objects

no code implementations13 Mar 2024 Yusuke Marumo, Kazuhiko Kawamoto, Hiroshi Kera

Not identical but similar objects are everywhere in the world.

Theoretical Understanding of Learning from Adversarial Perturbations

1 code implementation16 Feb 2024 Soichiro Kumano, Hiroshi Kera, Toshihiko Yamasaki

In this study, we provide a theoretical framework for understanding learning from perturbations using a one-hidden-layer network trained on mutually orthogonal samples.

Identifying Important Group of Pixels using Interactions

1 code implementation8 Jan 2024 Kosuke Sumiyasu, Kazuhiko Kawamoto, Hiroshi Kera

To better understand the behavior of image classifiers, it is useful to visualize the contribution of individual pixels to the model prediction.

Learning to Compute Gröbner Bases

no code implementations21 Nov 2023 Hiroshi Kera, Yuki Ishihara, Yuta Kambe, Tristan Vaccon, Kazuhiro Yokoyama

Solving a polynomial system, or computing an associated Gr\"obner basis, has been a fundamental task in computational algebra.

Fourier Analysis on Robustness of Graph Convolutional Neural Networks for Skeleton-based Action Recognition

1 code implementation29 May 2023 Nariki Tanaka, Hiroshi Kera, Kazuhiko Kawamoto

Using Fourier analysis, we explore the robustness and vulnerability of graph convolutional neural networks (GCNs) for skeleton-based action recognition.

Action Recognition Image Classification +1

Exploiting Frequency Spectrum of Adversarial Images for General Robustness

no code implementations15 May 2023 Chun Yang Tan, Kazuhiko Kawamoto, Hiroshi Kera

In recent years, there has been growing concern over the vulnerability of convolutional neural networks (CNNs) to image perturbations.

Data Augmentation

Vanishing Component Analysis with Contrastive Normalization

no code implementations27 Oct 2022 Ryosuke Masuya, Yuichi Ike, Hiroshi Kera

Vanishing component analysis (VCA) computes approximate generators of vanishing ideals of samples, which are further used for extracting nonlinear features of the samples.

Game-Theoretic Understanding of Misclassification

no code implementations7 Oct 2022 Kosuke Sumiyasu, Kazuhiko Kawamoto, Hiroshi Kera

This paper analyzes various types of image misclassification from a game-theoretic view.

Approximate Vanishing Ideal Computations at Scale

1 code implementation4 Jul 2022 Elias Wirth, Hiroshi Kera, Sebastian Pokutta

The vanishing ideal of a set of points $X = \{\mathbf{x}_1, \ldots, \mathbf{x}_m\}\subseteq \mathbb{R}^n$ is the set of polynomials that evaluate to $0$ over all points $\mathbf{x} \in X$ and admits an efficient representation by a finite subset of generators.

Superclass Adversarial Attack

no code implementations29 May 2022 Soichiro Kumano, Hiroshi Kera, Toshihiko Yamasaki

Adversarial attacks have only focused on changing the predictions of the classifier, but their danger greatly depends on how the class is mistaken.

Adversarial Attack Multi-Label Classification

Adversarial joint attacks on legged robots

no code implementations20 May 2022 Takuto Otomo, Hiroshi Kera, Kazuhiko Kawamoto

In experiments with the quadruped robot Ant-v2 and the bipedal robot Humanoid-v2, in OpenAI Gym environments, we find that differential evolution can efficiently find the strongest torque perturbations among the three methods.

OpenAI Gym reinforcement-learning +1

Adversarial Body Shape Search for Legged Robots

no code implementations20 May 2022 Takaaki Azakami, Hiroshi Kera, Kazuhiko Kawamoto

We propose an evolutionary computation method for an adversarial attack on the length and thickness of parts of legged robots by deep reinforcement learning.

Adversarial Attack OpenAI Gym

Adversarial amplitude swap towards robust image classifiers

no code implementations14 Mar 2022 Chun Yang Tan, Kazuhiko Kawamoto, Hiroshi Kera

Extensive experiments revealed that the images generated by combining the amplitude spectrum of adversarial images and the phase spectrum of clean images accommodates moderate and general perturbations, and training with these images equips a CNN classifier with more general robustness, performing well under both common corruptions and adversarial perturbations.

Reinforcement Learning with Adaptive Curriculum Dynamics Randomization for Fault-Tolerant Robot Control

no code implementations19 Nov 2021 Wataru Okamoto, Hiroshi Kera, Kazuhiko Kawamoto

This study is aimed at addressing the problem of fault tolerance of quadruped robots to actuator failure, which is critical for robots operating in remote or extreme environments.

reinforcement-learning Reinforcement Learning (RL)

Adversarially Trained Object Detector for Unsupervised Domain Adaptation

no code implementations13 Sep 2021 Kazuma Fujii, Hiroshi Kera, Kazuhiko Kawamoto

In addition, we propose a method that combines adversarial training and feature alignment to ensure the improved alignment of robust features with the target domain.

Object object-detection +2

Adversarial Bone Length Attack on Action Recognition

no code implementations13 Sep 2021 Nariki Tanaka, Hiroshi Kera, Kazuhiko Kawamoto

Specifically, we restrict the perturbations to the lengths of the skeleton's bones, which allows an adversary to manipulate only approximately 30 effective dimensions.

Action Recognition Adversarial Robustness +2

Evolving Architectures with Gradient Misalignment toward Low Adversarial Transferability

no code implementations13 Sep 2021 Kevin Richard G. Operiano, Wanchalerm Pora, Hitoshi Iba, Hiroshi Kera

Deep neural network image classifiers are known to be susceptible not only to adversarial examples created for them but even those created for others.

Border basis computation with gradient-weighted normalization

no code implementations2 Jan 2021 Hiroshi Kera

This study proposes the gradient-weighted normalization method for the approximate border basis computation of vanishing ideals, inspired by recent developments in machine learning.

Are DNNs fooled by extremely unrecognizable images?

1 code implementation7 Dec 2020 Soichiro Kumano, Hiroshi Kera, Toshihiko Yamasaki

In this paper, we address the question of whether there can be fooling images with no characteristic pattern of natural objects locally or globally.

Out-of-Distribution Detection

Gradient Boosts the Approximate Vanishing Ideal

no code implementations11 Nov 2019 Hiroshi Kera, Yoshihiko Hasegawa

In the last decade, the approximate vanishing ideal and its basis construction algorithms have been extensively studied in computer algebra and machine learning as a general model to reconstruct the algebraic variety on which noisy data approximately lie.

BIG-bench Machine Learning Translation

Spurious Vanishing Problem in Approximate Vanishing Ideal

no code implementations25 Jan 2019 Hiroshi Kera, Yoshihiko Hasegawa

We further propose a method that takes advantage of the iterative nature of basis construction so that computationally costly operations for coefficient normalization can be circumvented.

General Classification

Approximate Vanishing Ideal via Data Knotting

no code implementations29 Jan 2018 Hiroshi Kera, Yoshihiko Hasegawa

The present paper proposes a vanishing ideal that is tolerant to noisy data and also pursued to have a better algebraic structure.

Classification General Classification

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