Search Results for author: Kohei Ichikawa

Found 6 papers, 3 papers with code

Bayesian inference is facilitated by modular neural networks with different time scales

1 code implementation21 Oct 2022 Kohei Ichikawa, Kunihiko Kaneko

In performing Bayesian inference, the prior distribution must be shaped by sampling noisy external inputs.

Bayesian Inference

Dynamical Mechanism of Sampling-based Stochastic Inference under Probabilistic Population Codes

1 code implementation10 Jun 2021 Kohei Ichikawa, Asaki Kataoka

As a result, it was found that sampling in RNN is performed by a mechanism that efficiently utilizes the properties of dynamical systems, unlike FFNN.

Inductive Bias

BAT AGN Spectroscopic Survey-XXIII. A New Mid-Infrared Diagnostic for Absorption in Active Galactic Nuclei

no code implementations8 Feb 2021 Ryan W. Pfeifle, Claudio Ricci, Peter G. Boorman, Marko Stalevski, Daniel Asmus, Benny Trakhtenbrot, Michael J. Koss, Daniel Stern, Federica Ricci, Shobita Satyapal, Kohei Ichikawa, David J. Rosario, Turgay Caglar, Ezequiel Treister, Meredith Powell, Kyuseok Oh, C. Megan Urry, Fiona Harrison

In this study, we use the SWIFT/BAT AGN sample, which has received extensive multiwavelength follow-up analysis as a result of the BAT AGN Spectroscopic Survey (BASS), to develop a diagnostic for nuclear obscuration by examining the relationship between the line-of-sight column densities ($N_{\rm{H}}$), the 2-10 keV-to-$12\,\rm{\mu m}$ luminosity ratio, and WISE mid-infrared colors.

Astrophysics of Galaxies

Short term memory by transient oscillatory dynamics in recurrent neural networks

no code implementations29 Oct 2020 Kohei Ichikawa, Kunihiko Kaneko

By training recurrent neural networks to short-term memory tasks and analyzing the dynamics, the characteristics of the short-term memory mechanism were obtained in which the input information was encoded in the amplitude of transient oscillations, rather than the stationary neural activities.

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