Search Results for author: Yuichi Ike

Found 10 papers, 5 papers with code

Adaptive Topological Feature via Persistent Homology: Filtration Learning for Point Clouds

no code implementations NeurIPS 2023 Naoki Nishikawa, Yuichi Ike, Kenji Yamanishi

Machine learning for point clouds has been attracting much attention, with many applications in various fields, such as shape recognition and material science.

MAGDiff: Covariate Data Set Shift Detection via Activation Graphs of Deep Neural Networks

1 code implementation22 May 2023 Charles Arnal, Felix Hensel, Mathieu Carrière, Théo Lacombe, Hiroaki Kurihara, Yuichi Ike, Frédéric Chazal

Despite their successful application to a variety of tasks, neural networks remain limited, like other machine learning methods, by their sensitivity to shifts in the data: their performance can be severely impacted by differences in distribution between the data on which they were trained and that on which they are deployed.

Counterfactual Explanation with Missing Values

no code implementations28 Apr 2023 Kentaro Kanamori, Takuya Takagi, Ken Kobayashi, Yuichi Ike

Then, we propose a new framework of CE, named Counterfactual Explanation by Pairs of Imputation and Action (CEPIA), that enables users to obtain valid actions even with missing values and clarifies how actions are affected by imputation of the missing values.

counterfactual Counterfactual Explanation +2

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.

RipsNet: a general architecture for fast and robust estimation of the persistent homology of point clouds

1 code implementation3 Feb 2022 Thibault de Surrel, Felix Hensel, Mathieu Carrière, Théo Lacombe, Yuichi Ike, Hiroaki Kurihara, Marc Glisse, Frédéric Chazal

The use of topological descriptors in modern machine learning applications, such as Persistence Diagrams (PDs) arising from Topological Data Analysis (TDA), has shown great potential in various domains.

Topological Data Analysis

Topological Uncertainty: Monitoring trained neural networks through persistence of activation graphs

no code implementations7 May 2021 Théo Lacombe, Yuichi Ike, Mathieu Carriere, Frédéric Chazal, Marc Glisse, Yuhei Umeda

We showcase experimentally the potential of Topological Uncertainty in the context of trained network selection, Out-Of-Distribution detection, and shift-detection, both on synthetic and real datasets of images and graphs.

Data Augmentation Out-of-Distribution Detection

Ordered Counterfactual Explanation by Mixed-Integer Linear Optimization

1 code implementation22 Dec 2020 Kentaro Kanamori, Takuya Takagi, Ken Kobayashi, Yuichi Ike, Kento Uemura, Hiroki Arimura

One of the popular methods is Counterfactual Explanation (CE), also known as Actionable Recourse, which provides a user with a perturbation vector of features that alters the prediction result.

counterfactual Counterfactual Explanation +1

PersLay: A Neural Network Layer for Persistence Diagrams and New Graph Topological Signatures

1 code implementation20 Apr 2019 Mathieu Carrière, Frédéric Chazal, Yuichi Ike, Théo Lacombe, Martin Royer, Yuhei Umeda

Persistence diagrams, the most common descriptors of Topological Data Analysis, encode topological properties of data and have already proved pivotal in many different applications of data science.

Graph Classification Topological Data Analysis

DTM-based Filtrations

2 code implementations12 Nov 2018 Hirokazu Anai, Frédéric Chazal, Marc Glisse, Yuichi Ike, Hiroya Inakoshi, Raphaël Tinarrage, Yuhei Umeda

Despite strong stability properties, the persistent homology of filtrations classically used in Topological Data Analysis, such as, e. g. the Cech or Vietoris-Rips filtrations, are very sensitive to the presence of outliers in the data from which they are computed.

Computational Geometry Algebraic Topology

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