no code implementations • 30 Jan 2024 • Shuhei Kashiwamura, Ayaka Sakata, Masaaki Imaizumi
However, the selection of quantization hyperparameters, like the number of bits and value range for weight quantization, remains an underexplored area.
no code implementations • 22 Apr 2023 • Ayaka Sakata, Kunihiko Kaneko
The fitness for selection is given so that it takes a higher value as more of the active sites take two requested spin configurations depending on the regulation.
no code implementations • 26 Jun 2022 • Ayaka Sakata
We discuss the prediction accuracy of assumed statistical models in terms of prediction errors for the generalized linear model and penalized maximum likelihood methods.
no code implementations • 27 Jul 2020 • Ayaka Sakata
In identifying infected patients in a population, group testing is an effective method to reduce the number of tests and correct the test errors.
1 code implementation • 28 Apr 2020 • Ayaka Sakata
For the case in which the test returns a false result with finite probability, we propose Bayesian inference and a corresponding belief propagation (BP) algorithm to identify the infected patients from the results of tests performed on the pool.
1 code implementation • 27 Feb 2019 • Tomoyuki Obuchi, Ayaka Sakata
Second, we develop an approximate formula efficiently computing the cross-validation error without actually conducting the cross-validation, which is also applicable to the non-i. i. d.
no code implementations • 20 Feb 2019 • Ayaka Sakata, Tomoyuki Obuchi
A part of the discrepancy is resolved by introducing the control of the nonconvexity parameters to guide the AMP trajectory to the basin of the attraction.
no code implementations • 20 Feb 2018 • Ayaka Sakata
We propose an estimator of prediction error using an approximate message passing (AMP) algorithm that can be applied to a broad range of sparse penalties.
no code implementations • 8 Nov 2017 • Ayaka Sakata, Yingying Xu
Through asymptotic analysis, we show the correspondence between the density evolution of SCAD-AMP and the replica symmetric solution.
no code implementations • 6 Feb 2014 • Yoshiyuki Kabashima, Florent Krzakala, Marc Mézard, Ayaka Sakata, Lenka Zdeborová
We use the tools of statistical mechanics - the cavity and replica methods - to analyze the achievability and computational tractability of the inference problems in the setting of Bayes-optimal inference, which amounts to assuming that the two matrices have random independent elements generated from some known distribution, and this information is available to the inference algorithm.
no code implementations • 26 Jan 2013 • Ayaka Sakata, Yoshiyuki Kabashima
We consider a learning problem of identifying a dictionary matrix D (M times N dimension) from a sample set of M dimensional vectors Y = N^{-1/2} DX, where X is a sparse matrix (N times P dimension) in which the density of non-zero entries is 0<rho< 1.