Search Results for author: Sekitoshi Kanai

Found 17 papers, 0 papers with code

Adaptive Random Feature Regularization on Fine-tuning Deep Neural Networks

no code implementations15 Mar 2024 Shin'ya Yamaguchi, Sekitoshi Kanai, Kazuki Adachi, Daiki Chijiwa

To this end, AdaRand minimizes the gap between feature vectors and random reference vectors that are sampled from class conditional Gaussian distributions.

Fast Regularized Discrete Optimal Transport with Group-Sparse Regularizers

no code implementations14 Mar 2023 Yasutoshi Ida, Sekitoshi Kanai, Kazuki Adachi, Atsutoshi Kumagai, Yasuhiro Fujiwara

Regularized discrete optimal transport (OT) is a powerful tool to measure the distance between two discrete distributions that have been constructed from data samples on two different domains.

Unsupervised Domain Adaptation

Fast Saturating Gate for Learning Long Time Scales with Recurrent Neural Networks

no code implementations4 Oct 2022 Kentaro Ohno, Sekitoshi Kanai, Yasutoshi Ida

We prove that the gradient vanishing of the gate function can be mitigated by accelerating the convergence of the saturating function, i. e., making the output of the function converge to 0 or 1 faster.

Computational Efficiency Time Series +1

Transfer Learning with Pre-trained Conditional Generative Models

no code implementations27 Apr 2022 Shin'ya Yamaguchi, Sekitoshi Kanai, Atsutoshi Kumagai, Daiki Chijiwa, Hisashi Kashima

To transfer source knowledge without these assumptions, we propose a transfer learning method that uses deep generative models and is composed of the following two stages: pseudo pre-training (PP) and pseudo semi-supervised learning (P-SSL).

Knowledge Distillation Transfer Learning

F-Drop&Match: GANs with a Dead Zone in the High-Frequency Domain

no code implementations ICCV 2021 Shin'ya Yamaguchi, Sekitoshi Kanai

The key idea of F-Drop is to filter out unnecessary high-frequency components from the input images of the discriminators.

Smoothness Analysis of Adversarial Training

no code implementations2 Mar 2021 Sekitoshi Kanai, Masanori Yamada, Hiroshi Takahashi, Yuki Yamanaka, Yasutoshi Ida

We reveal that the constraint of adversarial attacks is one cause of the non-smoothness and that the smoothness depends on the types of the constraints.

Adversarial Robustness

Adversarial Training Makes Weight Loss Landscape Sharper in Logistic Regression

no code implementations5 Feb 2021 Masanori Yamada, Sekitoshi Kanai, Tomoharu Iwata, Tomokatsu Takahashi, Yuki Yamanaka, Hiroshi Takahashi, Atsutoshi Kumagai

We theoretically and experimentally confirm that the weight loss landscape becomes sharper as the magnitude of the noise of adversarial training increases in the linear logistic regression model.

regression

Constraining Logits by Bounded Function for Adversarial Robustness

no code implementations6 Oct 2020 Sekitoshi Kanai, Masanori Yamada, Shin'ya Yamaguchi, Hiroshi Takahashi, Yasutoshi Ida

We theoretically and empirically reveal that small logits by addition of a common activation function, e. g., hyperbolic tangent, do not improve adversarial robustness since input vectors of the function (pre-logit vectors) can have large norms.

Adversarial Robustness

Image Enhanced Rotation Prediction for Self-Supervised Learning

no code implementations25 Dec 2019 Shin'ya Yamaguchi, Sekitoshi Kanai, Tetsuya Shioda, Shoichiro Takeda

The rotation prediction (Rotation) is a simple pretext-task for self-supervised learning (SSL), where models learn useful representations for target vision tasks by solving pretext-tasks.

Image Enhancement Object +1

Effective Data Augmentation with Multi-Domain Learning GANs

no code implementations25 Dec 2019 Shin'ya Yamaguchi, Sekitoshi Kanai, Takeharu Eda

When trained on each target dataset reduced the samples to 5, 000 images, Domain Fusion achieves better classification accuracy than the data augmentation using fine-tuned GANs.

Data Augmentation General Classification +2

Absum: Simple Regularization Method for Reducing Structural Sensitivity of Convolutional Neural Networks

no code implementations19 Sep 2019 Sekitoshi Kanai, Yasutoshi Ida, Yasuhiro Fujiwara, Masanori Yamada, Shuichi Adachi

Furthermore, we reveal that robust CNNs with Absum are more robust against transferred attacks due to decreasing the common sensitivity and against high-frequency noise than standard regularization methods.

Adversarial Attack Adversarial Robustness

Autoencoding Binary Classifiers for Supervised Anomaly Detection

no code implementations26 Mar 2019 Yuki Yamanaka, Tomoharu Iwata, Hiroshi Takahashi, Masanori Yamada, Sekitoshi Kanai

Since our approach becomes able to reconstruct the normal data points accurately and fails to reconstruct the known and unknown anomalies, it can accurately discriminate both known and unknown anomalies from normal data points.

Supervised Anomaly Detection

Sigsoftmax: Reanalysis of the Softmax Bottleneck

no code implementations NeurIPS 2018 Sekitoshi Kanai, Yasuhiro Fujiwara, Yuki Yamanaka, Shuichi Adachi

On the basis of this analysis, we propose sigsoftmax, which is composed of a multiplication of an exponential function and sigmoid function.

Language Modelling

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