no code implementations • 8 Sep 2020 • Wenning Zhang, Ryohei Hisano, Takaaki Ohnishi, Takayuki Mizuno
Block modeling is widely used in studies on complex networks.
no code implementations • 25 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.''
no code implementations • 23 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.