2021-05-11T14:02:37Zhttps://ipsj.ixsq.nii.ac.jp/ej/?action=repository_oaipmhoai:ipsj.ixsq.nii.ac.jp:000669902020-04-01T00:33:29Z01164:05352:05656:05934
Conditional Density Estimation Based on Density Ratio EstimationConditional Density Estimation Based on Density Ratio Estimationenghttp://id.nii.ac.jp/1001/00066990/Technical Reporthttps://ipsj.ixsq.nii.ac.jp/ej/?action=repository_action_common_download&item_id=66990&item_no=1&attribute_id=1&file_no=1Copyright (c) 2009 by the Information Processing Society of JapanTokyo Institute of Technology / Japan Science and Technology AgencyNagoya Institute of TechnologyThe University of TokyoNagoya UniversityTokyo Institute of TechnologyThe University of TokyoMasashi, SugiyamaIchiro, TakeuchiTaiji, SuzukiTakafumi, KanamoriHirotaka, HachiyaDaisuke, OkanoharaEstimating the conditional mean of an input-output relation is the goal of regression. However, regression analysis is not sufficiently informative if the conditional distribution has multi-modality, is highly asymmetric, or contains heteroscedastic noise. In such scenarios, estimating the conditional distribution itself would be more useful. In this paper, we propose a novel method of conditional density estimation that is suitable for multi-dimensional continuous variables. The basic idea of the proposed method is to express the conditional density in terms of the density ratio and the ratio is directly estimated without going through density estimation.Estimating the conditional mean of an input-output relation is the goal of regression. However, regression analysis is not sufficiently informative if the conditional distribution has multi-modality, is highly asymmetric, or contains heteroscedastic noise. In such scenarios, estimating the conditional distribution itself would be more useful. In this paper, we propose a novel method of conditional density estimation that is suitable for multi-dimensional continuous variables. The basic idea of the proposed method is to express the conditional density in terms of the density ratio and the ratio is directly estimated without going through density estimation.AA12055912研究報告バイオ情報学（BIO）2009-BIO-194182009-12-102009-12-08