Search Results for author: Hiroshi Takahashi

Found 7 papers, 1 papers with code

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

Interdependencies of female board member appointments

no code implementations8 Jul 2020 Matthias Raddant, Hiroshi Takahashi

We investigate the networks of Japanese corporate boards and its influence on the appointments of female board members.

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

Variational Autoencoder with Implicit Optimal Priors

1 code implementation14 Sep 2018 Hiroshi Takahashi, Tomoharu Iwata, Yuki Yamanaka, Masanori Yamada, Satoshi Yagi

However, KL divergence with the aggregated posterior cannot be calculated in a closed form, which prevents us from using this optimal prior.

Density Estimation

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