{"id":10239,"date":"2026-10-29T10:28:23","date_gmt":"2026-10-29T01:28:23","guid":{"rendered":"https:\/\/since2020.jp\/media\/?p=10239"},"modified":"2026-10-29T10:28:23","modified_gmt":"2026-10-29T01:28:23","slug":"positive-confidence","status":"publish","type":"post","link":"https:\/\/since2020.jp\/media\/positive-confidence\/","title":{"rendered":"\u8ca0\u4f8b\u306e\u30c7\u30fc\u30bf\u304c\u306a\u304f\u3066\u3082\u5206\u985e\u5668\u306f\u4f5c\u308c\u308b\uff1f\u2500\u2500Positive-confidence\u5206\u985e"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>\u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3<\/strong><\/h2>\n\n\n\n<p>\u8cfc\u5165\u306e\u4e88\u6e2c\u30e2\u30c7\u30eb\u3092\u4f5c\u308a\u305f\u3044\u3068\u3057\u307e\u3059\u3002\u81ea\u793e\u306e\u9867\u5ba2\u306e\u30c7\u30fc\u30bf\uff08\u8cfc\u5165\u3057\u305f\u4eba\uff09\u306f\u7c21\u5358\u306b\u96c6\u3081\u3089\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u300c\u8cfc\u5165\u3057\u306a\u304b\u3063\u305f\u4eba\u300d\u3001\u305f\u3068\u3048\u3070\u7af6\u5408\u4ed6\u793e\u306e\u9867\u5ba2\u306e\u30c7\u30fc\u30bf\u306f\u624b\u306b\u5165\u308a\u307e\u305b\u3093\u3002\u6b63\u4f8b\uff08\u8cfc\u5165\u3057\u305f\u4eba\uff09\u3060\u3051\u3067\u300c\u8cb7\u3046\u4eba\u300d\u3068\u300c\u8cb7\u308f\u306a\u3044\u4eba\u300d\u3092\u898b\u5206\u3051\u308b\u5206\u985e\u5668\u306f\u4f5c\u308c\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n\n\n<p>Ishida\u3001Niu\u3001Sugiyama\uff082018\uff09\u306f\u3001\u6b63\u4f8b\u306b<strong>\u78ba\u4fe1\u5ea6<\/strong>\uff08\u305d\u306e\u7279\u5fb4\u3092\u6301\u3064\u4eba\u304c\u3001\u6b63\u4f8b\u3067\u3042\u308b\u78ba\u7387\uff09\u3092\u6dfb\u3048\u308c\u3070\u3001<strong>\u8ca0\u4f8b\u306e\u30c7\u30fc\u30bf\u3082\u30e9\u30d9\u30eb\u306a\u3057\u30c7\u30fc\u30bf\u3082\u4f7f\u308f\u305a\u306b<\/strong>\u30012\u5024\u5206\u985e\u5668\u3092\u5b66\u7fd2\u3067\u304d\u308b\u3053\u3068\u3092\u793a\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u304c<strong>Positive-confidence\uff08Pconf\u3001\u6b63\u4fe1\u983c\u5ea6\uff09\u5206\u985e<\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Pconf\u5206\u985e\u3068\u306f<\/strong><\/h2>\n\n\n\n<p><strong>Pconf\u5206\u985e<\/strong>\u3068\u306f\u3001\u300c<strong>\u6b63\u4f8b\u3060\u3051\u306b\u3001\u305d\u306e\u6b63\u4f8b\u3067\u3042\u308b\u78ba\u7387\uff08\u78ba\u4fe1\u5ea6\uff09\u3092\u6dfb\u3048\u305f\u30c7\u30fc\u30bf\u304b\u30892\u5024\u5206\u985e\u5668\u3092\u5b66\u7fd2\u3059\u308b<\/strong>\u300d\u624b\u6cd5\u3067\u3001\u5f31\u6559\u5e2b\u3042\u308a\u5b66\u7fd2\u306e\u4e00\u3064\u3067\u3059\u3002\u30c7\u30fc\u30bf\u306f\u3001\u6b63\u4f8b\u306e\u7279\u5fb4 $x_i$ \u3068\u78ba\u4fe1\u5ea6 $r_i = p(y = +1 \\mid x_i)$ \u306e\u7d44\u3067\u3059\u3002\u78ba\u4fe1\u5ea6\u304c\u4f4e\u3044\u6b63\u4f8b\u306f\u3001\u300c\u8ca0\u4f8b\u306b\u3082\u898b\u3048\u3084\u3059\u3044\u3001\u3042\u3044\u307e\u3044\u306a\u6b63\u4f8b\u300d\u3092\u8868\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"419\" src=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2026\/10\/image-27-1024x419.png\" alt=\"\" class=\"wp-image-10241\" srcset=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2026\/10\/image-27-1024x419.png 1024w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2026\/10\/image-27-300x123.png 300w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2026\/10\/image-27-768x314.png 768w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2026\/10\/image-27.png 1428w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u56f31\uff1a4\u3064\u306e\u8a2d\u5b9a\u3067\u4f7f\u3048\u308b\u30c7\u30fc\u30bf\u3002Pconf\u306f\u6b63\u4f8b\u3060\u3051\u306b\u78ba\u4fe1\u5ea6\u304c\u3064\u304f\uff08\u70b9\u306e\u8272\u304c\u6fc3\u3044\u307b\u3069\u78ba\u4fe1\u5ea6\u304c\u9ad8\u3044\uff09\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u8a2d\u5b9a<\/th><th>\u4f7f\u3048\u308b\u30c7\u30fc\u30bf<\/th><th>\u7279\u5fb4<\/th><\/tr><\/thead><tbody><tr><td>\u6559\u5e2b\u3042\u308a\uff08PN\uff09<\/td><td>\u6b63\u4f8b\u3068\u8ca0\u4f8b\uff08\u30e9\u30d9\u30eb\u3064\u304d\uff09<\/td><td>\u8ca0\u4f8b\u306e\u53ce\u96c6\u304c\u5fc5\u8981<\/td><\/tr><tr><td>PU\u5206\u985e<\/td><td>\u6b63\u4f8b\u3068\u30e9\u30d9\u30eb\u306a\u3057\u30c7\u30fc\u30bf<\/td><td>\u30af\u30e9\u30b9\u4e8b\u524d\u78ba\u7387\u306e\u63a8\u5b9a\u304c\u5fc5\u8981<\/td><\/tr><tr><td>1\u30af\u30e9\u30b9\u5206\u985e<\/td><td>\u6b63\u4f8b\u3060\u3051\uff08\u78ba\u4fe1\u5ea6\u306a\u3057\uff09<\/td><td>\u6b63\u4f8b\u3092\u300c\u8a18\u8ff0\u300d\u3059\u308b\u3002\u5206\u985e\u306e\u305f\u3081\u306e\u30cf\u30a4\u30d1\u30fc\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u8abf\u6574\u304c\u3067\u304d\u306a\u3044<\/td><\/tr><tr><td><strong>Pconf\u5206\u985e<\/strong><\/td><td><strong>\u6b63\u4f8b\u3060\u3051 \uff0b \u78ba\u4fe1\u5ea6<\/strong><\/td><td>\u8ca0\u4f8b\u3082\u30e9\u30d9\u30eb\u306a\u3057\u30c7\u30fc\u30bf\u3082\u30af\u30e9\u30b9\u4e8b\u524d\u78ba\u7387\u3082\u4e0d\u8981<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Pconf\u5206\u985e\u306e\u5229\u70b9\u3068\u3057\u3066\u30011\u30af\u30e9\u30b9\u5206\u985e\u3068\u9055\u3044\u5206\u985e\u306e\u305f\u3081\u306e\u30cf\u30a4\u30d1\u30fc\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u5ba2\u89b3\u7684\u306b\u9078\u3079\u307e\u3059\u3002\u307e\u305fPU\u5206\u985e\u3068\u9055\u3044\u3001\u63a8\u5b9a\u304c\u96e3\u3057\u3044\u30af\u30e9\u30b9\u4e8b\u524d\u78ba\u7387\u3092\u5fc5\u8981\u3068\u3057\u307e\u305b\u3093\u3002\u78ba\u4fe1\u5ea6\u304c\u30af\u30e9\u30b9\u4e8b\u524d\u78ba\u7387\u306e\u60c5\u5831\u3092\u9593\u63a5\u7684\u306b\u542b\u3093\u3067\u3044\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u306a\u305c\u6b63\u4f8b\u3060\u3051\u3067\u5b66\u7fd2\u3067\u304d\u308b\u306e\u304b\uff08\u6570\u5024\u4f8b\uff09<\/strong><\/h2>\n\n\n\n<p>\u9375\u306b\u306a\u308b\u306e\u306f\u3001\u300c\u8ca0\u4f8b\u306e\u5bc6\u5ea6\u3092\u6b63\u4f8b\u306e\u5bc6\u5ea6\u3068\u78ba\u4fe1\u5ea6\u304b\u3089\u8a08\u7b97\u3067\u304d\u308b\u300d\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<p>$$<br>\\text{\u8ca0\u4f8b\u306e\u5bc6\u5ea6} = \\text{\u6b63\u4f8b\u306e\u5bc6\u5ea6} \\times \\frac{1-r(x)}{r(x)}<br>$$<\/p>\n\n\n\n<p>\u67b6\u7a7a\u306e\u4f8b\u3067\u78ba\u304b\u3081\u307e\u3059\u3002\u7279\u5fb4 $x$ \u306f $A$ \u304b $B$ \u306e2\u3064\u306e\u5024\u3092\u3068\u308a\u307e\u3059\u3002\u5b66\u7fd2\u3067\u4f7f\u3048\u308b\u306e\u306f\u3001<strong>\u6b63\u4f8b\u306e\u6570\u3068\u305d\u306e\u78ba\u4fe1\u5ea6\u3060\u3051<\/strong>\u3067\u3059\u3002\u78ba\u4fe1\u5ea6\u306f\u30a2\u30f3\u30b1\u30fc\u30c8\u306a\u3069\u3067\u5916\u304b\u3089\u4e0e\u3048\u3089\u308c\u307e\u3059\uff08\u3053\u3053\u3067\u306f\u672c\u5f53\u306e\u78ba\u7387\u3068\u4e00\u81f4\u3057\u3066\u3044\u308b\u3068\u3057\u307e\u3059\uff09\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5fb4 $x$<\/th><th>\u6b63\u4f8b\u306e\u6570<\/th><th>\u4e0e\u3048\u3089\u308c\u308b\u78ba\u4fe1\u5ea6 $r$<\/th><th>$\\frac{1-r}{r}$<\/th><\/tr><\/thead><tbody><tr><td>$A$<\/td><td>300<\/td><td>$\\frac{3}{4}$<\/td><td>$\\frac{1}{3}$<\/td><\/tr><tr><td>$B$<\/td><td>100<\/td><td>$\\frac{1}{6}$\uff08\u7d040.17\uff09<\/td><td>$5$<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u5404\u6b63\u4f8b\u306b $\\frac{1-r}{r}$ \u306e\u91cd\u307f\u3067\u8ca0\u4f8b\u3068\u3057\u3066\u306e\u640d\u5931\u3082\u6301\u305f\u305b\u308b\u3068\u3001\u8ca0\u4f8b\u306e\u6570\u3092<strong>\u6b63\u4f8b\u306e\u6570\u3068\u78ba\u4fe1\u5ea6\u3060\u3051\u304b\u3089<\/strong>\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>$A$\uff1a<\/strong> $300 \\times \\frac{1}{3} = 100$<\/li>\n\n\n\n<li><strong>$B$\uff1a<\/strong> $100 \\times 5 = 500$<\/li>\n<\/ul>\n\n\n\n<p><strong>\u7b54\u3048\u5408\u308f\u305b<\/strong>\u3092\u3057\u307e\u3059\u3002\u3053\u306e\u4f8b\u306f\u3001\u7b54\u3048\u5408\u308f\u305b\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u5168\u4f53\uff081,000\u4eba\uff09\u306e\u4e2d\u306e\u8ca0\u4f8b\u306e\u6570\u3092\u3042\u3089\u304b\u3058\u3081\u6c7a\u3081\u3066\u4f5c\u308a\u307e\u3057\u305f\u3002\u5b9f\u969b\u306e\u5b66\u7fd2\u3067\u306f\u3001\u53f3\u306e\u5217\u306f\u898b\u3048\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5fb4 $x$<\/th><th>\u8a08\u7b97\u3067\u6c42\u3081\u305f\u8ca0\u4f8b\u306e\u6570<\/th><th>\u672c\u5f53\u306e\u8ca0\u4f8b\u306e\u6570\uff08\u5b66\u7fd2\u3067\u306f\u898b\u3048\u306a\u3044\uff09<\/th><\/tr><\/thead><tbody><tr><td>$A$<\/td><td>100<\/td><td>100<\/td><\/tr><tr><td>$B$<\/td><td>500<\/td><td>500<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u203b \u78ba\u4fe1\u5ea6\uff08$\\frac{3}{4}$ \u3068 $\\frac{1}{6}$\uff09\u306f\u3001\u300c\u305d\u306e\u7279\u5fb4\u306e\u4eba\u306e\u3046\u3061\u3001\u6b63\u4f8b\u306e\u5272\u5408\u300d\u3068\u540c\u3058\u5024\u3067\u3059\uff08$A$\uff1a$\\frac{300}{400}$\u3001$B$\uff1a$\\frac{100}{600}$\uff09\u3002\u7b54\u3048\u5408\u308f\u305b\u306e\u305f\u3081\u306b\u3001\u3053\u306e\u5024\u306b\u306a\u308b\u3088\u3046\u306b\u4f8b\u3092\u4f5c\u308a\u307e\u3057\u305f\u3002\u73fe\u5b9f\u306b\u306f\u3001\u8ca0\u4f8b\u306e\u6570\u3082\u3053\u306e\u5272\u5408\u3082\u5206\u304b\u308a\u307e\u305b\u3093\u3002\u78ba\u4fe1\u5ea6\u306f\u30a2\u30f3\u30b1\u30fc\u30c8\u306a\u3069\u3067\u5916\u304b\u3089\u4e0e\u3048\u3089\u308c\u308b\u5024\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u898b\u3048\u306a\u3044\u8ca0\u4f8b\u304c\u3001\u6b63\u4f8b\u306e\u6570\u3068\u78ba\u4fe1\u5ea6\u304b\u3089\u6b63\u78ba\u306b\u518d\u73fe\u3067\u304d\u307e\u3057\u305f\u3002Pconf\u5206\u985e\u3067\u306f\u3001\u3053\u306e\u518d\u73fe\u3057\u305f\u8ca0\u4f8b\u306e\u5206\u3092\u640d\u5931\u306b\u52a0\u3048\u308b\u3053\u3068\u3067\u3001\u3075\u3064\u3046\u306e\u6559\u5e2b\u3042\u308a\u5b66\u7fd2\uff08PN\uff09\u3067\u6700\u5c0f\u306b\u3057\u305f\u3044\u5206\u985e\u30ea\u30b9\u30af\u3092\u4e0d\u504f\u306b\u63a8\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u6ce8\u610f\u70b9\uff1a<\/strong>\u3053\u306e\u4f8b\u306f\u3001\u78ba\u4fe1\u5ea6\u304c\u672c\u5f53\u306e\u78ba\u7387\u3068\u4e00\u81f4\u3057\u3001\u4eba\u6570\u304c\u5168\u4f53\u306e\u6570\u3068\u4e00\u81f4\u3059\u308b\u7406\u60f3\u5316\u3057\u305f\u5834\u5408\u3067\u3059\u3002\u5b9f\u969b\u306e\u30c7\u30fc\u30bf\u3067\u306f\u3001\u8ca0\u4f8b\u306e\u6570\u306f\u3074\u3063\u305f\u308a\u3068\u306f\u518d\u73fe\u3055\u308c\u307e\u305b\u3093\u3002\u78ba\u4fe1\u5ea6\u304c\u6b63\u78ba\u306a\u3089\u3001\u5e73\u5747\u3068\u3057\u3066\u4e00\u81f4\u3057\u307e\u3059\uff08\u4e0d\u504f\uff09\u3002\u3057\u304b\u3057\u3001\u30c7\u30fc\u30bf\u304c\u6709\u9650\u3067\u3042\u308b\u3053\u3068\u3084\u3001\u78ba\u4fe1\u5ea6\u304c\u30a2\u30f3\u30b1\u30fc\u30c8\u306a\u3069\u306e\u898b\u7a4d\u3082\u308a\u3067\u3042\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u3070\u3089\u3064\u304d\u3084\u305a\u308c\u304c\u751f\u3058\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u7d20\u6734\u306a\u91cd\u307f\u3065\u3051\u3068\u306e\u9055\u3044<\/strong><\/h2>\n\n\n\n<p>\u78ba\u4fe1\u5ea6\u304c\u5206\u304b\u308b\u306a\u3089\u3001\u300c\u6b63\u4f8b\u306e\u640d\u5931\u306b $r$\u3001\u8ca0\u4f8b\u306e\u640d\u5931\u306b $1-r$ \u3092\u639b\u3051\u308b\u300d\u3068\u3044\u3046\u7d20\u6734\u306a\u65b9\u6cd5\u3092\u601d\u3044\u3064\u304f\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u3053\u306e\u65b9\u6cd5\u3067\u306f<strong>\u5b66\u7fd2\u306e\u5bfe\u8c61\u304c\u672c\u6765\u3068\u306f\u5225\u306e\u91cf\u306b\u306a\u308a\u307e\u3059<\/strong>\u3002\u7406\u7531\u306f\u3001\u78ba\u4fe1\u5ea6\u3064\u304d\u306e\u30c7\u30fc\u30bf\u304c $p(x)$ \u3067\u306f\u306a\u304f\u3001$p(x \\mid y = +1)$\uff08\u6b63\u4f8b\u306e\u5206\u5e03\uff09\u304b\u3089\u3057\u304b\u30b5\u30f3\u30d7\u30eb\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>Pconf\uff1a<\/strong><\/p>\n\n\n\n<p>$$<br>\\sum_i \\left[\\ell(g(x_i)) + \\frac{1-r_i}{r_i}\\ell(-g(x_i))\\right]<br>$$<\/p>\n\n\n\n<p><strong>\u7d20\u6734\u306a\u65b9\u6cd5\uff1a<\/strong><\/p>\n\n\n\n<p>$$<br>\\sum_i \\left[r_i\\ell(g(x_i)) + (1-r_i)\\ell(-g(x_i))\\right]<br>$$<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>$\\ell(g(x_i))$\uff1a$i$ \u756a\u76ee\u306e\u6b63\u4f8b\u3092\u3001\u6b63\u4f8b\u3068\u3057\u3066\u6271\u3063\u305f\u3068\u304d\u306e\u640d\u5931<\/li>\n\n\n\n<li>$\\frac{1-r_i}{r_i}\\ell(-g(x_i))$\uff1a\u305d\u306e\u6b63\u4f8b\u306b\u3001\u300c\u8ca0\u4f8b\u306e\u5206\u300d\u3068\u3057\u3066\u6301\u305f\u305b\u305f\u640d\u5931\u3002\u91cd\u307f $\\frac{1-r_i}{r_i}$ \u306f\u3001\u78ba\u4fe1\u5ea6\u304c\u4f4e\u3044\u307b\u3069\u5927\u304d\u304f\u306a\u308b<\/li>\n\n\n\n<li><strong>\u7d20\u6734\u306a\u65b9\u6cd5\uff1a<\/strong> \u6b63\u4f8b\u306e\u640d\u5931\u306b $r_i$\u3001\u8ca0\u4f8b\u306e\u640d\u5931\u306b $1-r_i$ \u3092\u639b\u3051\u305f\u3082\u306e<\/li>\n<\/ul>\n\n\n\n<p>\u4e0a\u306e\u6570\u5024\u4f8b\u3067\u3001\u5404 $x$ \u306b\u640d\u5931\u304c\u3069\u308c\u3060\u3051\u306e\u91cd\u307f\u3067\u52b9\u304f\u304b\uff08\u6b63\u4f8b\u5206\u3068\u8ca0\u4f8b\u5206\u306e\u5408\u8a08\uff09\u3092\u6bd4\u3079\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5fb4 $x$<\/th><th>\u672c\u5f53\uff08\u6b63\u4f8b\uff0b\u8ca0\u4f8b\uff09<\/th><th>Pconf<\/th><th>\u7d20\u6734\u306a\u65b9\u6cd5<\/th><\/tr><\/thead><tbody><tr><td>$A$<\/td><td>$300 + 100 = 400$<\/td><td>$300 + 100 = 400$<\/td><td>$225 + 75 = 300$<\/td><\/tr><tr><td>$B$<\/td><td>$100 + 500 = 600$<\/td><td>$100 + 500 = 600$<\/td><td>$16.7 + 83.3 = 100$<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Pconf\u5206\u985e\u306f\u3001\u5404 $x$ \u306e\u91cd\u307f\u304c\u672c\u5f53\u306e\u5206\u5e03\uff08400\u3068600\uff09\u3068\u4e00\u81f4\u3057\u307e\u3059\u3002\u7d20\u6734\u306a\u65b9\u6cd5\u306f\u3001\u5404 $x$ \u3067\u306e\u6b63\u4f8b\u3068\u8ca0\u4f8b\u306e\u6bd4\uff08$3:1$\u3001$1:5$\uff09\u306f\u6b63\u3057\u3044\u3082\u306e\u306e\u3001$x$ \u3054\u3068\u306e\u91cd\u307f\u304c300\u3068100\u306b\u306a\u308a\u307e\u3059\u3002$B$ \u304c\u672c\u5f53\u306f\u5168\u4f53\u306e60%\u3092\u5360\u3081\u308b\u306e\u306b\u3001\u7d20\u6734\u306a\u65b9\u6cd5\u3067\u306f25%\u306b\u3057\u304b\u898b\u3048\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"482\" src=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2026\/10\/image-26-1024x482.png\" alt=\"\" class=\"wp-image-10240\" srcset=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2026\/10\/image-26-1024x482.png 1024w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2026\/10\/image-26-300x141.png 300w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2026\/10\/image-26-768x361.png 768w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2026\/10\/image-26.png 1428w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u56f32\uff1a\u5404\u7279\u5fb4\u306e\u5024\u3067\u640d\u5931\u306b\u52b9\u304f\u91cd\u307f\u306e\u5408\u8a08\uff08\u68d2\u306e\u4e0a\u306e\u6570\u5b57\uff09\u3002Pconf\u5206\u985e\u306f\u672c\u5f53\u306e\u5206\u5e03\uff08400\u3068600\uff09\u3068\u4e00\u81f4\u3059\u308b\u3002\u7d20\u6734\u306a\u65b9\u6cd5\u306f300\u3068100\u306b\u306a\u308a\u3001\u4e00\u81f4\u3057\u306a\u3044\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u5b66\u7fd2\u306e\u3057\u304b\u305f<\/strong><\/h2>\n\n\n\n<p>\u5b66\u7fd2\u306f\u3001\u3075\u3064\u3046\u306e\u6559\u5e2b\u3042\u308a\u5b66\u7fd2\u3068\u307b\u3068\u3093\u3069\u540c\u3058\u3067\u3059\u3002\u9055\u3046\u306e\u306f<strong>\u6700\u5c0f\u306b\u3059\u308b\u5f0f<\/strong>\u3060\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p>$$<br>\\min_g \\sum_i \\left[\\ell(g(x_i)) + \\frac{1-r_i}{r_i}\\ell(-g(x_i))\\right]<br>$$<\/p>\n\n\n\n<p>\u5404\u6b63\u4f8b\u306e\u300c\u6b63\u4f8b\u3068\u3057\u3066\u9593\u9055\u3048\u305f\u640d\u5931\u300d\u3068\u300c\u78ba\u4fe1\u5ea6\u304b\u3089\u518d\u73fe\u3057\u305f\u3001\u8ca0\u4f8b\u306e\u5206\u306e\u640d\u5931\u300d\u3092\u8db3\u3057\u305f\u5408\u8a08\u304c\u6700\u5c0f\u306b\u306a\u308b\u5206\u985e\u5668\u3092\u63a2\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u30e2\u30c7\u30eb\u3068\u89e3\u304d\u65b9\u306f\u81ea\u7531\u3067\u3059\u3002<\/strong>\u00a0Pconf\u5206\u985e\u304c\u6c7a\u3081\u308b\u306e\u306f\u3001\u3053\u306e\u5f0f\u3060\u3051\u3067\u3059\u3002\u30e2\u30c7\u30eb\u3082\u3001\u640d\u5931\u3082\u3001\u6700\u5c0f\u306b\u3059\u308b\u8a08\u7b97\u306e\u65b9\u6cd5\u3082\u3001\u3075\u3064\u3046\u306e\u6559\u5e2b\u3042\u308a\u5b66\u7fd2\u3068\u540c\u3058\u3088\u3046\u306b\u9078\u3079\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u30cf\u30a4\u30d1\u30fc\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u9078\u3073\u65b9\uff1a<\/strong>\u00a0\u8ca0\u4f8b\u304c\u306a\u304f\u3001\u6b63\u89e3\u7387\u306f\u8a08\u7b97\u3067\u304d\u307e\u305b\u3093\u3002\u4ee3\u308f\u308a\u306b\u691c\u8a3c\u7528\u306e\u6b63\u4f8b\uff08\u78ba\u4fe1\u5ea6\u3064\u304d\uff09\u3067\u3001\u4e0a\u306e\u5f0f\u306e\u640d\u5931\u3092\u9593\u9055\u3044\u3092\u6570\u3048\u308b0-1\u640d\u5931\u306b\u5909\u3048\u3066\u8a08\u7b97\u3057\u3001\u5024\u304c\u5c0f\u3055\u3044\u8a2d\u5b9a\u3092\u9078\u3073\u307e\u3059\u3002\u3053\u306e\u5024\u306f\u300c\u8aa4\u3063\u3066\u5224\u5b9a\u3055\u308c\u308b\u4eba\u6570\u300d\u306e\u898b\u7a4d\u3082\u308a\u3067\u3059\u3002<\/li>\n\n\n\n<li><strong>\u7406\u8ad6\u306e\u4fdd\u8a3c\uff1a<\/strong>\u00a0\u30c7\u30fc\u30bf\u304c\u5897\u3048\u308b\u307b\u3069\u3001\u8aa4\u308a\u7387\u304c\u3001\u6700\u826f\u306e\u5206\u985e\u5668\u306b\u8fd1\u3065\u304d\u307e\u3059\uff08\u4e00\u81f4\u6027\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u5b9f\u9a13\u7d50\u679c<\/strong><\/h2>\n\n\n\n<p>\u8ad6\u6587\u306e\u5b9f\u9a13\u304b\u3089\u3001\u3044\u304f\u3064\u304b\u306e\u7d50\u679c\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff08\u6570\u5024\u306f\u6b63\u89e3\u7387\u3008%\u3009\u3067\u300120\u56de\u306e\u5e73\u5747\uff09\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30c7\u30fc\u30bf<\/th><th>Pconf<\/th><th>\u7d20\u6734\u306a\u91cd\u307f\u3065\u3051<\/th><th>\u6559\u5e2b\u3042\u308a\uff08\u6b63\u4f8b\uff0b\u8ca0\u4f8b\uff09<\/th><\/tr><\/thead><tbody><tr><td>2\u6b21\u5143\u30ac\u30a6\u30b9\u5206\u5e03\uff08\u8a2d\u5b9aD\uff09<\/td><td>91.5<\/td><td>90.8<\/td><td>91.4<\/td><\/tr><tr><td>Fashion-MNIST\uff1aT-shirt \/ trouser<\/td><td>92.14<\/td><td>85.30<\/td><td>98.98<\/td><\/tr><tr><td>Fashion-MNIST\uff1aT-shirt \/ sneaker<\/td><td>89.86<\/td><td>58.26<\/td><td>100.00<\/td><\/tr><tr><td>CIFAR-10\uff1aairplane \/ frog<\/td><td>90.80<\/td><td>81.84<\/td><td>95.95<\/td><\/tr><tr><td>CIFAR-10\uff1aairplane \/ cat<\/td><td>85.18<\/td><td>89.60<\/td><td>92.90<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u591a\u304f\u306e\u5834\u5408\u3001Pconf\u306f\u7d20\u6734\u306a\u91cd\u307f\u3065\u3051\u3068\u540c\u7b49\u304b\u3001\u305d\u308c\u4ee5\u4e0a\u3067\u3057\u305f\u3002\u305f\u3060\u3057\u3001\u4e0a\u306eCIFAR-10\u306eairplane \/ cat\u306e\u3088\u3046\u306b\u3001\u7d20\u6734\u306a\u91cd\u307f\u3065\u3051\u306e\u307b\u3046\u304c\u826f\u3044\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u4eba\u5de5\u30c7\u30fc\u30bf\uff084\u3064\u306e\u8a2d\u5b9a\uff09\u3067\u306f\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u6559\u5e2b\u3042\u308a\u5b66\u7fd2\u306b\u8fd1\u3044\u6b63\u89e3\u7387\u3067\u3057\u305f\u3002<\/li>\n\n\n\n<li><strong>\u78ba\u4fe1\u5ea6\u306b\u30ce\u30a4\u30ba\u3092\u52a0\u3048\u308b\u3068\u3001\u6b63\u89e3\u7387\u306f\u4e0b\u304c\u308a\u307e\u3059\u3002<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>\u6ce8\u610f\u70b9\uff1a<\/strong>Fashion-MNIST\u3068CIFAR-10\u306e\u5b9f\u9a13\u3067\u306f\u3001\u78ba\u4fe1\u5ea6\u306f\u6b63\u4f8b\u3068\u8ca0\u4f8b\u306e\u4e21\u65b9\u3067\u5b66\u7fd2\u3057\u305f\u5225\u306e\u78ba\u7387\u5206\u985e\u5668\u304b\u3089\u4f5c\u3063\u3066\u3044\u307e\u3059\uff08\u73fe\u5b9f\u306b\u306f\u4eba\u304c\u78ba\u4fe1\u5ea6\u3092\u4ed8\u3051\u307e\u3059\uff09\u3002\u305d\u306e\u305f\u3081\u3001\u5b9f\u969b\u306e\u30c7\u30fc\u30bf\u3067\u306e\u6027\u80fd\u306f\u78ba\u4fe1\u5ea6\u306e\u8cea\u306b\u5de6\u53f3\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u307e\u3068\u3081<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Pconf\u5206\u985e\uff1a<\/strong> \u6b63\u4f8b\u3060\u3051\u306b\u78ba\u4fe1\u5ea6\u3092\u6dfb\u3048\u305f\u30c7\u30fc\u30bf\u30672\u5024\u5206\u985e\u5668\u3092\u5b66\u7fd2\u3059\u308b\u3002\u8ca0\u4f8b\u3082\u30e9\u30d9\u30eb\u306a\u3057\u30c7\u30fc\u30bf\u3082\u30af\u30e9\u30b9\u4e8b\u524d\u78ba\u7387\u3082\u4e0d\u8981\u3002<\/li>\n\n\n\n<li><strong>\u3057\u304f\u307f\uff1a<\/strong> $\\text{\u8ca0\u4f8b\u306e\u5bc6\u5ea6} = \\text{\u6b63\u4f8b\u306e\u5bc6\u5ea6} \\times \\frac{1-r}{r}$\u3002\u5404\u6b63\u4f8b\u306b\u3001\u3053\u306e\u91cd\u307f\u3067\u8ca0\u4f8b\u306e\u640d\u5931\u3092\u6301\u305f\u305b\u308b\u3002<\/li>\n\n\n\n<li><strong>\u7d20\u6734\u306a\u91cd\u307f\u3065\u3051\u3068\u306e\u9055\u3044\uff1a<\/strong> $x$ \u3054\u3068\u306e\u91cd\u307f\u304c\u672c\u5f53\u306e\u5206\u5e03\u3068\u4e00\u81f4\u3059\u308b\u304b\u3002\u67d4\u8edf\u3067\u306a\u3044\u30e2\u30c7\u30eb\u3067\u306f\u3001\u7d20\u6734\u306a\u65b9\u6cd5\u306f\u4e00\u81f4\u3057\u306a\u3044\u3002<\/li>\n\n\n\n<li><strong>\u6ce8\u610f\uff1a<\/strong> \u78ba\u4fe1\u5ea6\u306e\u8cea\u306b\u5de6\u53f3\u3055\u308c\u308b\u3002\u78ba\u4fe1\u5ea6\u304c0\u306b\u8fd1\u3044\u3068\u4e0d\u5b89\u5b9a\u306b\u306a\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u53c2\u8003\u6587\u732e<\/strong><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Ishida, T., Niu, G., &amp; Sugiyama, M. (2018). Binary classification from positive-confidence data. In <em>Advances in Neural Information Processing Systems 31<\/em> (NeurIPS 2018). <a href=\"https:\/\/arxiv.org\/abs\/1710.07138\">arXiv:1710.07138<\/a><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3 \u8cfc\u5165\u306e\u4e88\u6e2c\u30e2\u30c7\u30eb\u3092\u4f5c\u308a\u305f\u3044\u3068\u3057\u307e\u3059\u3002\u81ea\u793e\u306e\u9867\u5ba2\u306e\u30c7\u30fc\u30bf\uff08\u8cfc\u5165\u3057\u305f\u4eba\uff09\u306f\u7c21\u5358\u306b\u96c6\u3081\u3089\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u300c\u8cfc\u5165\u3057\u306a\u304b\u3063\u305f\u4eba\u300d\u3001\u305f\u3068\u3048\u3070\u7af6\u5408\u4ed6\u793e\u306e\u9867\u5ba2\u306e\u30c7\u30fc\u30bf\u306f\u624b\u306b\u5165\u308a\u307e\u305b\u3093\u3002\u6b63\u4f8b\uff08\u8cfc\u5165\u3057\u305f\u4eba\uff09\u3060\u3051\u3067\u300c\u8cb7\u3046\u4eba [&hellip;]<\/p>\n","protected":false},"author":77,"featured_media":10242,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","swell_btn_cv_data":"","footnotes":"","_wp_rev_ctl_limit":""},"categories":[1251],"tags":[39,419],"class_list":["post-10239","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-data-analysis","tag-39","tag-419"],"_links":{"self":[{"href":"https:\/\/since2020.jp\/media\/wp-json\/wp\/v2\/posts\/10239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/since2020.jp\/media\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/since2020.jp\/media\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/since2020.jp\/media\/wp-json\/wp\/v2\/users\/77"}],"replies":[{"embeddable":true,"href":"https:\/\/since2020.jp\/media\/wp-json\/wp\/v2\/comments?post=10239"}],"version-history":[{"count":2,"href":"https:\/\/since2020.jp\/media\/wp-json\/wp\/v2\/posts\/10239\/revisions"}],"predecessor-version":[{"id":10244,"href":"https:\/\/since2020.jp\/media\/wp-json\/wp\/v2\/posts\/10239\/revisions\/10244"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/since2020.jp\/media\/wp-json\/wp\/v2\/media\/10242"}],"wp:attachment":[{"href":"https:\/\/since2020.jp\/media\/wp-json\/wp\/v2\/media?parent=10239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/since2020.jp\/media\/wp-json\/wp\/v2\/categories?post=10239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/since2020.jp\/media\/wp-json\/wp\/v2\/tags?post=10239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}