講演名 2014-11-17
Online Direct Density-ratio Estimation under the Kullback-Leibler Loss
,
PDFダウンロードページ PDFダウンロードページへ
抄録(和)
抄録(英) Many machine learning problems, such as non-stationarity adaptation, outlier detection, dimensionality reduction, and conditional density estimation, can be effectively solved by using the ratio of probability densities. Since the naive two step procedure of first estimating the probability densities and then taking their ratio performs poorly, methods to directly estimate the density ratio from two sets of samples without density estimation have been extensively studied recently. However, these methods are batch algorithms that use the whole dataset to estimate the density ratio, and they are inefficient in the online setup where training samples are provided sequentially and solutions are updated incrementally without storing previous samples. In this paper, we propose an online version of a density ratio estimator based on the adaptive regularization of weight vectors (AROW). Through experiments on inlier-based outlier detection, we demonstrate the usefulness of the proposed method.
キーワード(和)
キーワード(英) online learning / density-ratio estimation / adaptive regularization of weight vectors / outlier detection
資料番号 IBISML2014-59
発行日

研究会情報
研究会 IBISML
開催期間 2014/11/10(から1日開催)
開催地(和)
開催地(英)
テーマ(和)
テーマ(英)
委員長氏名(和)
委員長氏名(英)
副委員長氏名(和)
副委員長氏名(英)
幹事氏名(和)
幹事氏名(英)
幹事補佐氏名(和)
幹事補佐氏名(英)

講演論文情報詳細
申込み研究会 Information-Based Induction Sciences and Machine Learning (IBISML)
本文の言語 ENG
タイトル(和)
サブタイトル(和)
タイトル(英) Online Direct Density-ratio Estimation under the Kullback-Leibler Loss
サブタイトル(和)
キーワード(1)(和/英) / online learning
第 1 著者 氏名(和/英) / PLESSIS Marthinus Christoffel DU
第 1 著者 所属(和/英)
Department of Complexity Science and Engineering, University of Tokyo
発表年月日 2014-11-17
資料番号 IBISML2014-59
巻番号(vol) vol.114
号番号(no) 306
ページ範囲 pp.-
ページ数 6
発行日