41 citations · 44 across the 9 of their papers we have counts for
3 papers · 1 filter
Nondiagonal Mixture of Dirichlet Network Distributions for Analyzing a Stock Ownership Network
Wenning Zhang, Ryohei Hisano, Takaaki Ohnishi +1
Block modeling is widely used in studies on complex networks. The cornerstone model is the stochastic block model (SBM), widely used over the past decades. However, the SBM is limi…
Fractal Patterns in Spatial Distribution of Population by Age Group
Mariko I. Ito, Takaaki Ohnishi
Multifractality is one of the patterns observed in spatial distributions of populations. In this study, we performed multifractal analysis for populations by age group in the capit…
Gaussian Hierarchical Latent Dirichlet Allocation: Bringing Polysemy Back
Takahiro Yoshida, Ryohei Hisano, Takaaki Ohnishi
Topic models are widely used to discover the latent representation of a set of documents. The two canonical models are latent Dirichlet allocation, and Gaussian latent Dirichlet al…