Search Results for author: Koji Maruhashi

Found 8 papers, 5 papers with code

Learning Large Causal Structures from Inverse Covariance Matrix via Sparse Matrix Decomposition

1 code implementation25 Nov 2022 Shuyu Dong, Kento Uemura, Akito Fujii, Shuang Chang, Yusuke Koyanagi, Koji Maruhashi, Michèle Sebag

In the context of linear structural equation models (SEMs), this paper focuses on learning causal structures from the inverse covariance matrix.

Causal Discovery

Generating 3D Molecules for Target Protein Binding

1 code implementation19 Apr 2022 Meng Liu, Youzhi Luo, Kanji Uchino, Koji Maruhashi, Shuiwang Ji

Second, to preserve the desirable equivariance property, we select a local reference atom according to the designed auxiliary classifiers and then construct a local spherical coordinate system.

Drug Discovery

Automated Data Augmentations for Graph Classification

no code implementations26 Feb 2022 Youzhi Luo, Michael McThrow, Wing Yee Au, Tao Komikado, Kanji Uchino, Koji Maruhashi, Shuiwang Ji

In this work, we propose GraphAug, a novel automated data augmentation method aiming at computing label-invariant augmentations for graph classification.

Data Augmentation Graph Classification

Crowdsourcing Evaluation of Saliency-based XAI Methods

no code implementations27 Jun 2021 Xiaotian Lu, Arseny Tolmachev, Tatsuya Yamamoto, Koh Takeuchi, Seiji Okajima, Tomoyoshi Takebayashi, Koji Maruhashi, Hisashi Kashima

In order to compare various saliency-based XAI methods quantitatively, several approaches for automated evaluation schemes have been proposed; however, there is no guarantee that such automated evaluation metrics correctly evaluate explainability, and a high rating by an automated evaluation scheme does not necessarily mean a high explainability for humans.

Explainable Artificial Intelligence (XAI)

Inter-domain Multi-relational Link Prediction

1 code implementation11 Jun 2021 Luu Huu Phuc, Koh Takeuchi, Seiji Okajima, Arseny Tolmachev, Tomoyoshi Takebayashi, Koji Maruhashi, Hisashi Kashima

Multi-relational graph is a ubiquitous and important data structure, allowing flexible representation of multiple types of interactions and relations between entities.

Link Prediction

Bermuda Triangles: GNNs Fail to Detect Simple Topological Structures

1 code implementation ICLR Workshop GTRL 2021 Arseny Tolmachev, Akira Sakai, Masaru Todoriki, Koji Maruhashi

Most graph neural network architectures work by message-passing node vector embeddings over the adjacency matrix, and it is assumed that they capture graph topology by doing that.

Linear Tensor Projection Revealing Nonlinearity

no code implementations8 Jul 2020 Koji Maruhashi, Heewon Park, Rui Yamaguchi, Satoru Miyano

We propose a learning method that searches for a subspace that maximizes the prediction accuracy while retaining as much of the original data information as possible, even if the prediction model in the subspace has strong nonlinearity.

Dimensionality Reduction

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