Search Results for author: Ryohei Hisano

Found 7 papers, 0 papers with code

Gaussian Hierarchical Latent Dirichlet Allocation: Bringing Polysemy Back

no code implementations25 Feb 2020 Takahiro Yoshida, Ryohei Hisano, Takaaki Ohnishi

Compared with latent Dirichlet allocation, Gaussian latent Dirichlet allocation is limited in the sense that it does not capture the polysemy of a word such as ``bank.''

Topic Models

Learning Topic Models by Neighborhood Aggregation

no code implementations22 Feb 2018 Ryohei Hisano

Topic models are frequently used in machine learning owing to their high interpretability and modular structure.

Document Classification Topic Models

Semi-supervised Graph Embedding Approach to Dynamic Link Prediction

no code implementations14 Oct 2016 Ryohei Hisano

We propose a simple discrete time semi-supervised graph embedding approach to link prediction in dynamic networks.

Dynamic Link Prediction Graph Embedding

A New Approach to Building the Interindustry Input--Output Table

no code implementations6 Apr 2015 Ryohei Hisano

By exploiting interfirm buyer--seller network data, we show that the problem of estimating the interdependence of industries is similar to the problem of uncovering the latent block structure in network science literature.

High quality topic extraction from business news explains abnormal financial market volatility

no code implementations23 Oct 2012 Ryohei Hisano, Didier Sornette, Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe

We show that the whole landscape of news that affect stock price movements can be automatically summarized via simple regularized regressions between trading activity and news information pieces decomposed, with the help of simple topic modeling techniques, into their "thematic" features.

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