Search Results for author: Sadamori Kojaku

Found 6 papers, 4 papers with code

Residual2Vec: Debiasing graph embedding with random graphs

1 code implementation NeurIPS 2021 Sadamori Kojaku, Jisung Yoon, Isabel Constantino, Yong-Yeol Ahn

Here, we investigate the impact of the random walks' bias on graph embedding and propose residual2vec, a general graph embedding method that can debias various structural biases in graphs by using random graphs.

Graph Embedding Graph Representation Learning +1

Unsupervised embedding of trajectories captures the latent structure of scientific migration

no code implementations4 Dec 2020 Dakota Murray, Jisung Yoon, Sadamori Kojaku, Rodrigo Costas, Woo-Sung Jung, Staša Milojević, Yong-Yeol Ahn

Here, we demonstrate the ability of the model word2vec to encode nuanced relationships between discrete locations from migration trajectories, producing an accurate, dense, continuous, and meaningful vector-space representation.

Cultural Vocal Bursts Intensity Prediction

Constructing networks by filtering correlation matrices: A null model approach

1 code implementation26 Mar 2019 Sadamori Kojaku, Naoki Masuda

Thresholding on the value of the pairwise correlation is probably the most straightforward and common method to create a network from a correlation matrix.

Physics and Society

Multiscale core-periphery structure in a global liner shipping network

1 code implementation14 Aug 2018 Sadamori Kojaku, Mengqiao Xu, Haoxiang Xia, Naoki Masuda

We develop an algorithm to detect core-periphery pairs in a network, which allows one to find core and peripheral nodes on different scales and uses a configuration model that accounts for the fact that the network is obtained by the one-mode projection of a bipartite network.

Physics and Society

Solving Feature Sparseness in Text Classification using Core-Periphery Decomposition

no code implementations SEMEVAL 2018 Xia Cui, Sadamori Kojaku, Naoki Masuda, Danushka Bollegala

We observe that prioritising features that are common to both training and test instances as cores during the CP decomposition to further improve the accuracy of text classification.

Domain Adaptation General Classification +4

Finding multiple core-periphery pairs in networks

2 code implementations22 Feb 2017 Sadamori Kojaku, Naoki Masuda

We propose a scalable algorithm to detect multiple non-overlapping groups of core-periphery structure in a network.

Physics and Society Social and Information Networks

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