Search Results for author: Takaaki Ohnishi

Found 3 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

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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