{"id":5344,"date":"2021-11-06T10:54:58","date_gmt":"2021-11-06T01:54:58","guid":{"rendered":"http:\/\/hituji1012.xsrv.jp\/?p=871"},"modified":"2026-08-01T13:50:59","modified_gmt":"2026-08-01T04:50:59","slug":"93","status":"publish","type":"post","link":"https:\/\/tetsumag.com\/blog\/2021\/11\/06\/93\/","title":{"rendered":"\u3010PyTorch\u3011\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u306e\u5b9f\u88c5"},"content":{"rendered":"\n<p><strong data-rich-text-format-boundary=\"true\"><\/strong><\/p>\n<p>\u4ee5\u524d\u3001\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"dqEcYsJSsL\"><p><a href=\"https:\/\/www.tetsumag.com\/2020\/12\/05\/240\/\">\u3010Python\u3011\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u306e\u308f\u304b\u308a\u3084\u3059\u3044\u89e3\u8aac<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;\u3010Python\u3011\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u306e\u308f\u304b\u308a\u3084\u3059\u3044\u89e3\u8aac&#8221; &#8212; \u3066\u3064\u307e\u3050\" src=\"https:\/\/www.tetsumag.com\/2020\/12\/05\/240\/embed\/#?secret=4dfQOrr41W#?secret=dqEcYsJSsL\" data-secret=\"dqEcYsJSsL\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p>\u4eca\u56de\u306f\u3001PyTorch\u3067\u5b9f\u88c5\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u51e6\u7406\u304c\u5927\u4e8b\u306a\u306e\u306f\u3001\u753b\u50cf\u306e\u5206\u985e\u51e6\u7406\u306a\u3069\u3067\u3082\u3001\u4e00\u756a\u6700\u5f8c\u306e\u51e6\u7406\u306f\u540c\u3058\u3053\u3068\u3092\u3057\u3066\u3044\u308b\u70b9\u3067\u3059\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u4ee5\u4e0b\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"raw\" title=\"Out\">seaborn\r\nscikit-learn\r\nmatplotlib\r\npandas\r\nnumpy\r\ntorch<\/pre>\n<p>PyTorch\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u306f\u516c\u5f0f\u30ea\u30f3\u30af\u3092\u53c2\u7167\u304f\u3060\u3055\u3044<\/p>\n<p><strong><a href=\"https:\/\/pytorch.org\" target=\"_blank\" rel=\"noopener\">PyTorch\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/a><\/strong><\/p>\n<p>\u672c\u8a18\u4e8b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/p>\n<p><a href=\"http:\/\/hituji1012.xsrv.jp\/wp-content\/uploads\/2021\/01\/ml9.zip\">\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9(jupyter notebook)<\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_38 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">\u76ee\u6b21<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #444444;color:#444444\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #444444;color:#444444\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/tetsumag.com\/blog\/2021\/11\/06\/93\/#%E5%A4%9A%E9%A0%85%E5%88%86%E9%A1%9E%E3%81%AE%E3%83%AD%E3%82%B8%E3%82%B9%E3%83%86%E3%82%A3%E3%83%83%E3%82%AF%E5%9B%9E%E5%B8%B0%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6\" title=\"\u591a\u9805\u5206\u985e\u306e\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u306b\u3064\u3044\u3066\">\u591a\u9805\u5206\u985e\u306e\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u306b\u3064\u3044\u3066<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/tetsumag.com\/blog\/2021\/11\/06\/93\/#%E3%83%87%E3%83%BC%E3%82%BF%E3%81%AE%E7%A2%BA%E8%AA%8D\" title=\"\u30c7\u30fc\u30bf\u306e\u78ba\u8a8d\">\u30c7\u30fc\u30bf\u306e\u78ba\u8a8d<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/tetsumag.com\/blog\/2021\/11\/06\/93\/#%E5%88%86%E9%A1%9E%E3%81%8C2%E7%A8%AE%E9%A1%9E%E3%81%A83%E7%A8%AE%E9%A1%9E%E3%81%AE%E9%81%95%E3%81%84\" title=\"\u5206\u985e\u304c2\u7a2e\u985e\u30683\u7a2e\u985e\u306e\u9055\u3044\">\u5206\u985e\u304c2\u7a2e\u985e\u30683\u7a2e\u985e\u306e\u9055\u3044<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/tetsumag.com\/blog\/2021\/11\/06\/93\/#pytorch%E3%81%A7%E3%83%AD%E3%82%B8%E3%82%B9%E3%83%86%E3%82%A3%E3%83%83%E3%82%AF%E5%9B%9E%E5%B8%B0%E3%81%AE%E5%AE%9F%E8%A3%85\" title=\"pytorch\u3067\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u306e\u5b9f\u88c5\">pytorch\u3067\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u306e\u5b9f\u88c5<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/tetsumag.com\/blog\/2021\/11\/06\/93\/#%E3%83%87%E3%83%BC%E3%82%BF%E3%81%AE%E7%94%A8%E6%84%8F\" title=\"\u30c7\u30fc\u30bf\u306e\u7528\u610f\">\u30c7\u30fc\u30bf\u306e\u7528\u610f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/tetsumag.com\/blog\/2021\/11\/06\/93\/#%E3%83%A2%E3%83%87%E3%83%AB%E3%82%92%E5%AE%9A%E7%BE%A9\" title=\"\u30e2\u30c7\u30eb\u3092\u5b9a\u7fa9\">\u30e2\u30c7\u30eb\u3092\u5b9a\u7fa9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/tetsumag.com\/blog\/2021\/11\/06\/93\/#%E3%83%AD%E3%82%B9%E3%81%A8%E6%9C%80%E9%81%A9%E5%8C%96%E9%96%A2%E6%95%B0%E3%82%92%E9%81%B8%E3%81%B6\" title=\"\u30ed\u30b9\u3068\u6700\u9069\u5316\u95a2\u6570\u3092\u9078\u3076\">\u30ed\u30b9\u3068\u6700\u9069\u5316\u95a2\u6570\u3092\u9078\u3076<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/tetsumag.com\/blog\/2021\/11\/06\/93\/#%E5%AD%A6%E7%BF%92%E3%81%AE%E3%83%AB%E3%83%BC%E3%83%97\" title=\"\u5b66\u7fd2\u306e\u30eb\u30fc\u30d7\">\u5b66\u7fd2\u306e\u30eb\u30fc\u30d7<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/tetsumag.com\/blog\/2021\/11\/06\/93\/#%E3%83%86%E3%82%B9%E3%83%88\" title=\"\u30c6\u30b9\u30c8\">\u30c6\u30b9\u30c8<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"%E5%A4%9A%E9%A0%85%E5%88%86%E9%A1%9E%E3%81%AE%E3%83%AD%E3%82%B8%E3%82%B9%E3%83%86%E3%82%A3%E3%83%83%E3%82%AF%E5%9B%9E%E5%B8%B0%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6\"><\/span>\u591a\u9805\u5206\u985e\u306e\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u306b\u3064\u3044\u3066<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u524d\u56de\u306e\u8a18\u4e8b\u3067\u306fscikit-learn\u3092\u4f7f\u3063\u3066\u30012\u7a2e\u985e\u306e\u5206\u985e\u3092\u3057\u307e\u3057\u305f\u304c\u3001\u4eca\u56de\u306f\u5206\u985e\u6570\u304c3\u7a2e\u985e\u3042\u308b\u3001\u591a\u9805\u5206\u985e\u3092\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E3%83%87%E3%83%BC%E3%82%BF%E3%81%AE%E7%A2%BA%E8%AA%8D\"><\/span>\u30c7\u30fc\u30bf\u306e\u78ba\u8a8d<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u4eca\u56de\u306firis\u306e\u30c7\u30fc\u30bf\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\">import seaborn as sns\r\ndf = sns.load_dataset('iris')\r\n# \u54c1\u7a2e\u306e\u78ba\u8a8d\r\nprint(df['species'].unique())\r\n# \u30c7\u30fc\u30bf\u306e\u4e00\u90e8\u78ba\u8a8d\r\ndf.head()<\/pre>\n<p><a href=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_1.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_1.png\" alt=\"\" width=\"768\" height=\"403\" class=\"aligncenter size-full wp-image-7136\" srcset=\"https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_1.png 768w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_1-600x315.png 600w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_1-300x157.png 300w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><\/p>\n<p>4\u3064\u306e\u7279\u5fb4\u91cf\uff08\u8aac\u660e\u5909\u6570\uff09\u3068\u6700\u5f8c\u306e\u5217\u304c\u5206\u985e\u3057\u305f\u3044\u7a2e\u985e\uff08\u76ee\u7684\u5909\u6570\uff09\u304c3\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E5%88%86%E9%A1%9E%E3%81%8C2%E7%A8%AE%E9%A1%9E%E3%81%A83%E7%A8%AE%E9%A1%9E%E3%81%AE%E9%81%95%E3%81%84\"><\/span>\u5206\u985e\u304c2\u7a2e\u985e\u30683\u7a2e\u985e\u306e\u9055\u3044<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>2\u7a2e\u985e\u30683\u7a2e\u985e\u3067\u8a08\u7b97\u304c\u5909\u308f\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u30012\u7a2e\u985e\u306e\u5834\u5408\u306f\u6b21\u306e\u3088\u3046\u306a\u8a08\u7b97\u3092\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>\u308f\u304b\u308a\u3084\u3059\u3055\u306e\u305f\u3081\u3001\u30d0\u30a4\u30a2\u30b9\u9805\u3092\u7701\u7565\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>*\u30d0\u30a4\u30a2\u30b9\u9805\u306fy = ax + b\u306eb\uff08\u5207\u7247\uff09\u306e\u3068\u3053\u308d\u3067\u3059\u3002<\/p>\n<p><a href=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_2.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_2.png\" alt=\"\" width=\"768\" height=\"219\" class=\"aligncenter size-full wp-image-7137\" srcset=\"https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_2.png 768w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_2-600x171.png 600w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_2-300x86.png 300w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u884c\u5217\u306e\u639b\u3051\u7b97\u3092\u3057\u3066\u3044\u305f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>output = x1w1 + x2w2 + x3w3 + x4w4<\/p>\n<p>\u306e\u8a08\u7b97\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092sigmoid\u95a2\u6570\u30670\u304b\u30891\u306e\u6570\u5024\u306b\u3057\u3066\u3001\u8aac\u660e\u5909\u6570\u306e0\/1\u3068\u6bd4\u8f03\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>\u3053\u308c\u304c3\u7a2e\u985e\u306e\u5834\u5408\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_3.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_3.png\" alt=\"\" width=\"768\" height=\"184\" class=\"aligncenter size-full wp-image-7138\" srcset=\"https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_3.png 768w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_3-600x144.png 600w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_3-300x72.png 300w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><\/p>\n<p>\u307e\u305a\u3001\u76ee\u7684\u5909\u6570\u30923\u3064\u306b\u3057\u3066[&#8216;setosa&#8217; &#8216;versicolor&#8217; &#8216;virginica&#8217;]\u3068\u5206\u3051\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001setosa\u3067\u3042\u308c\u3070[ 1, 0, 0]\u3068\u306a\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306e\u307e\u307e\u3060\u3068\u3001outuput\u304c1\u3064\u3060\u3068\u8db3\u308a\u307e\u305b\u3093\u306d\u3002<\/p>\n<p>\u306a\u306e\u3067\u3001\u8a08\u7b97\u3057\u305f\u3089\u3001output\u304c3\u3064\u306b\u306a\u308b\u3088\u3046\u306b\u8a08\u7b97\u3057\u307e\u3059\u3002<br \/>\n\uff0aoutput\u306f\u898b\u3084\u3059\u3055\u306e\u305f\u3081\u7e26\u3067\u4e26\u3079\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>output\u306f<strong>softmax<\/strong>\u3068\u3044\u3046\u51e6\u7406\u3092\u3059\u308b\u3053\u3068\u3067\u3001\u305d\u308c\u305e\u308c\u306e\u9805\u76ee\u304c\u3069\u306e\u78ba\u7387\u304c\u9ad8\u304f\u306a\u308b\u304b\u30010\u304b\u30891\u3067\u8868\u73fe\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001[3, 1, 0.5]\u3068\u3044\u3046\u6570\u5b57\u3092softmax\u306e\u51e6\u7406\u3092\u3068\u304a\u3059\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\"># softmax\u306e\u78ba\u8a8d\r\nimport numpy as np\r\n\r\ndef softmax(x):\r\n    return np.exp(x)\/np.sum(np.exp(x))\r\n\r\noutput = [3,1,0.5]\r\nprint(softmax(output))<\/pre>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"raw\" title=\"Out\">[0.82140902 0.11116562 0.06742536]<\/pre>\n<p>\u305d\u308c\u305e\u308c\u30010\u304b\u30891\u3067\u8868\u73fe\u3055\u308c\u3066\u3001\u305d\u308c\u305e\u308c\u3092\u8db3\u3059\u3068\u5408\u8a08\u304c1\u306b\u306a\u308b\u3088\u3046\u306b\u8a08\u7b97\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306esoftmax\u3067\u51fa\u529b\u3055\u308c\u305f\u7d50\u679c\u3068\u76ee\u7684\u5909\u6570\u306e\u5024\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002<\/p>\n<p>\u8a08\u7b97\u306e\u6982\u8981\u304c\u308f\u304b\u3063\u305f\u3068\u3053\u308d\u3067\u3001\u3053\u308c\u3092pytorch\u3067\u5b9f\u88c5\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2><span class=\"ez-toc-section\" id=\"pytorch%E3%81%A7%E3%83%AD%E3%82%B8%E3%82%B9%E3%83%86%E3%82%A3%E3%83%83%E3%82%AF%E5%9B%9E%E5%B8%B0%E3%81%AE%E5%AE%9F%E8%A3%85\"><\/span>pytorch\u3067\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u306e\u5b9f\u88c5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>pytorch\u3067\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u3092\u5b9f\u88c5\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u3069\u306e\u6a5f\u68b0\u5b66\u7fd2\u30e2\u30c7\u30eb\u3082\u540c\u3058\u3067\u3059\u304c\u3001\u6b21\u306e\u30b9\u30c6\u30c3\u30d7\u3092\u8e0f\u307f\u307e\u3059\u3002<\/p>\n<div class=\"list-box-4\">\n<p><!-- \u3053\u3053\u304b\u3089\u4e0b\u306b\u30ea\u30b9\u30c8\u3092\u8cbc\u308a\u4ed8\u3051\u308b --><\/p>\n<ol class=\"list-6\">\n<li>\u30c7\u30fc\u30bf\u306e\u7528\u610f<\/li>\n<li>\u30e2\u30c7\u30eb\u3092\u5b9a\u7fa9<\/li>\n<li>\u30ed\u30b9\u3092\u9078\u3076<\/li>\n<li>\u6700\u9069\u5316\u95a2\u6570\u3092\u9078\u3076<\/li>\n<li>\u5b66\u7fd2\u306e\u30eb\u30fc\u30d7<\/li>\n<li>\u30c6\u30b9\u30c8<\/li>\n<\/ol>\n<p><!-- \u3053\u3053\u304b\u3089\u4e0a\u306b\u30ea\u30b9\u30c8\u3092\u8cbc\u308a\u4ed8\u3051\u308b --><\/p>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"%E3%83%87%E3%83%BC%E3%82%BF%E3%81%AE%E7%94%A8%E6%84%8F\"><\/span>\u30c7\u30fc\u30bf\u306e\u7528\u610f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>seaborn\u306b\u5165\u3063\u3066\u3044\u308b\u30c7\u30fc\u30bf\u306eiris\u3092\u4f7f\u3063\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\">import seaborn as sns\r\ndf = sns.load_dataset('iris')\r\n# \u54c1\u7a2e\u306e\u78ba\u8a8d\r\nprint(df['species'].unique())\r\n# \u30c7\u30fc\u30bf\u306e\u4e00\u90e8\u78ba\u8a8d\r\ndf.head()<\/pre>\n<p>\u3053\u308c\u306f\u3001\u5148\u307b\u3069\u78ba\u8a8d\u3057\u305f\u3082\u306e\u3068\u540c\u3058\u3067\u3059\u3002<\/p>\n<p>\u6b21\u306f\u3001\u5b66\u7fd2\u7528\u30c6\u30b9\u30c8\u7528\u306a\u3069\u306b\u5206\u3051\u307e\u3059\u3002<\/p>\n<div class=\"list-box-4\">\n<p><!-- \u3053\u3053\u304b\u3089\u4e0b\u306b\u30ea\u30b9\u30c8\u3092\u8cbc\u308a\u4ed8\u3051\u308b --><\/p>\n<ol class=\"list-6\">\n<li>\u8aac\u660e\u5909\u6570(x)\u3068\u76ee\u7684\u5909\u6570(y)\u306b\u5206\u3051\u308b<\/li>\n<li>\u76ee\u7684\u5909\u6570\u306especies\u3092\u6570\u5024\u306e0,1,2\u306b\u5909\u63db<\/li>\n<li>\u5b66\u7fd2\u3068\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306b\u5206\u3051\u308b<\/li>\n<\/ol>\n<p><!-- \u3053\u3053\u304b\u3089\u4e0a\u306b\u30ea\u30b9\u30c8\u3092\u8cbc\u308a\u4ed8\u3051\u308b --><\/p>\n<\/div>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\">from sklearn.model_selection import train_test_split\r\nimport pandas as pd\r\n\r\n# \u8aac\u660e\u5909\u6570\u3068\u76ee\u7684\u5909\u6570\u3092\u5206\u3051\u308b\r\nx = df[['sepal_width', 'sepal_length', 'petal_width', 'petal_length']].values\r\n# \u76ee\u7684\u5909\u6570\u306f0,1,2\u306b\u5909\u66f4\u3057\u3066\u304a\u304f\r\ndf['species'] = df['species'].map({'setosa': 0, 'versicolor': 1, 'virginica': 2})\r\ny = df['species'].values\r\n\r\n# \r\nx_train, x_test, y_train, y_test = train_test_split(x, y, test_size = 0.1)\r\nprint(x_train.shape)\r\nprint(y_train.shape)\r\nprint(x_test.shape)\r\nprint(y_test.shape)<\/pre>\n<p>\u30c7\u30fc\u30bf\u306e\u5f62\u3082\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\">(135, 4)\r\n(135,)\r\n(15, 4)\r\n(15,)<\/pre>\n<p>\u3042\u3068\u306f\u3001\u3053\u308c\u3092torch\u3067\u4f7f\u3048\u308b\u30c7\u30fc\u30bf\u306b\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u8aad\u307f\u8fbc\u898b\u307e\u3059\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\">import torch\r\nfrom torch.utils.data import TensorDataset\r\nfrom torch.utils.data import DataLoader\r\nfrom torch.autograd import Variable<\/pre>\n<p>Datasets\u3001Dataloders\u3092\u4f5c\u308a\u307e\u3059\u3002<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 17.066957787481808%; border-color: #8c8c8c; background-color: #949494;\"><\/td>\n<td style=\"width: 49.59970887918486%; border-color: #8c8c8c; background-color: #949494;\"><strong>\u6a5f\u80fd<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 17.066957787481808%;\">Datasets<\/td>\n<td style=\"width: 49.59970887918486%;\">\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3093\u3067\u5168\u30c7\u30fc\u30bf\u3092\u7ba1\u7406<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 17.066957787481808%;\">Dataloaders<\/td>\n<td style=\"width: 49.59970887918486%;\">Datasets\u306e\u30c7\u30fc\u30bf\u3092\u30d0\u30c3\u30c1\u30b5\u30a4\u30ba\u306b\u5fdc\u3058\u3066\u3001\u53d6\u308a\u51fa\u3059<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote class=\"wp-embedded-content\" data-secret=\"CxcRHAuG7C\"><p><a href=\"https:\/\/www.tetsumag.com\/2022\/09\/25\/286\/\">\u3010PyTorch\u3011Dataset\u3001Dataloader\u306e\u4f5c\u6210\u904e\u7a0b\u3000\u8a73\u7d30\u306a\u7406\u89e3\u3068\u3088\u304f\u3042\u308b\u30df\u30b9<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;\u3010PyTorch\u3011Dataset\u3001Dataloader\u306e\u4f5c\u6210\u904e\u7a0b\u3000\u8a73\u7d30\u306a\u7406\u89e3\u3068\u3088\u304f\u3042\u308b\u30df\u30b9&#8221; &#8212; \u3066\u3064\u307e\u3050\" src=\"https:\/\/www.tetsumag.com\/2022\/09\/25\/286\/embed\/#?secret=CsaKE067Mm#?secret=CxcRHAuG7C\" data-secret=\"CxcRHAuG7C\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\"># \u30c7\u30fc\u30bf\u306e\u6e96\u5099\r\nx_train = torch.from_numpy(x_train).float()\r\nx_test = torch.from_numpy(x_test).float()\r\ny_train = torch.from_numpy(y_train).float()\r\ny_test = torch.from_numpy(y_test).float()\r\n\r\ntrain = TensorDataset(x_train, y_train)\r\ntrain_loader = DataLoader(train, batch_size=10, shuffle=True)\r\n\r\ntest = TensorDataset(x_test, y_test)\r\ntest_loader = DataLoader(test, batch_size=5, shuffle=True)<\/pre>\n<p>batch_size\u306f\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3059\u3068\u304d\u306e\u6570\u3067\u3059\u304c\u3001\u3053\u308c\u306f\u9069\u5f53\u306a\u5024\u3092\u9078\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u300c\u4eca\u56de\u306f135\u306e\u30c7\u30fc\u30bf\u3060\u3057\u300110\u500b\u305a\u3064\u53d6\u308a\u51fa\u3059\u304b\u3041\u300d\u3068\u304b\u3067\u3059\u3002<\/p>\n<p>\u8aac\u660e\u5909\u6570\u306e\u30c7\u30fc\u30bf\u306e\u5f62\u304c\u304a\u304b\u3057\u3044\u3063\u3066\u601d\u3063\u305f\u65b9\u306f\u3044\u308b\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u5148\u7a0b\u306e\u8aac\u660e\u3060\u3068\u3001\u76ee\u7684\u5909\u6570\u3092[1, 0, 0]\u3084[0, 1, 0]\u306b\u3057\u3066\u6bd4\u8f03\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u8aac\u660e\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u3053\u308c\u3060\u3068\u3001y_train\u306e\u30c7\u30fc\u30bf\u306e\u5f62\u306f(135, 3)\u3068\u306a\u3063\u3066\u3044\u3066\u30013\u5217\u306e\u30c7\u30fc\u30bf\u306b\u306a\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u4eca\u56de\u306f\u3001&#8217;setosa&#8217;: 0, &#8216;versicolor&#8217;: 1, &#8216;virginica&#8217;: 2\u3068\u6570\u5024\u306b\u7f6e\u304d\u63db\u3048\u3066\u3044\u308b\u306e\u3067\u3001(135, )\u30681\u5217\u306e\u30c7\u30fc\u30bf\u306a\u3063\u3066\u3044\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_5.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_5.png\" alt=\"\" width=\"300\" height=\"242\" class=\"aligncenter size-full wp-image-7128\" \/><\/a><\/p>\n<p>\u3053\u308c\u306f\u3001\u5f8c\u3067\u51fa\u3066\u304f\u308bCrossEntropyLoss\u3068\u3044\u3046\u30ed\u30b9\u306e\u65b9\u3067\u3001\u3046\u307e\u304f\u8a08\u7b97\u3057\u3066\u304f\u308c\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u306a\u306e\u3067\u3001PyTorch\u3067\u306fspecies\u306f0,1,2,..\u3068\u6570\u5024\u306b\u5909\u66f4\u3059\u308c\u3070OK\u3067\u3059\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E3%83%A2%E3%83%87%E3%83%AB%E3%82%92%E5%AE%9A%E7%BE%A9\"><\/span>\u30e2\u30c7\u30eb\u3092\u5b9a\u7fa9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u6b21\u306f\u3001\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u30e2\u30c7\u30eb\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<p>\u56f3\u3067\u306f\u3001\u30d4\u30f3\u30af\u67a0\u306e\u90e8\u5206\u3067\u3059\u3002<\/p>\n<p><a href=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_4.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_4.png\" alt=\"\" width=\"768\" height=\"197\" class=\"aligncenter size-full wp-image-7129\" srcset=\"https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_4.png 768w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_4-600x154.png 600w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_4-300x77.png 300w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><\/p>\n<p>\u30e2\u30c7\u30eb\u306b\u306f\u3001softmax\u306f\u542b\u3081\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<p>\u6b21\u306b\u51fa\u3066\u304f\u308b\u3001CrossEntropyLoss\u306b\u542b\u307e\u308c\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001\u30e2\u30c7\u30eb\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\"># \u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u30e2\u30c7\u30eb\r\nclass LogisticRegression(torch.nn.Module):\r\n    def __init__(self, input_dim, output_dim):\r\n        super(LogisticRegression, self).__init__()\r\n        \r\n        self.l1 = torch.nn.Linear(input_dim, output_dim)\r\n\r\n    def forward(self, x):\r\n        \r\n        x = self.l1(x)\r\n\r\n        return x<\/pre>\n<p>\u3053\u308c\u306f\u30e2\u30c7\u30eb\u306e\u8a2d\u8a08\u66f8\u307f\u305f\u3044\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u30e2\u30c7\u30eb\u306b\u3001\u5165\u529b\u3059\u308b\u30c7\u30fc\u30bf\u306e\u6570\u3001\u51fa\u529b\u3055\u308c\u308b\u5206\u985e\u6570\u3092\u5165\u529b\u3057\u3066\u3001\u30e2\u30c7\u30eb\u3092\u4f5c\u308a\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306f\u3001 sepal_length,sepal_width,petal_length,petal_width \u306e4\u3064\u306e\u7279\u5fb4\u91cf\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u5206\u985e\u6570\u306f\u3001setosa, versicolor, virginica\u306e3\u3064\u306a\u306e\u3067\u30013\u3067\u3059\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\"># \u7279\u5fb4\u91cf\u306e\u6570\r\ninput_dim = 4\r\n# \u5206\u985e\u6570\r\noutput_dim = 3\r\n# \u6a5f\u68b0\u5b66\u7fd2\u30e2\u30c7\u30eb\uff1d\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\r\nmodel = LogisticRegression(input_dim, output_dim)<\/pre>\n<p>\u3053\u308c\u3067\u3001\u5148\u7a0b\u306e\u56f3\u306e\u30d4\u30f3\u30af\u306e\u90e8\u5206\u304c\u5b9f\u88c5\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>\u3082\u3046\u5c11\u3057\u3001\u30b3\u30fc\u30c9\u306e\u88dc\u8db3\u3092\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n<p>4\u3064\u306e\u30c7\u30fc\u30bf\u30923\u3064\u306b\u3057\u305f\u3044\u308f\u3051\u3067\u3059\u304c\u3001\u305d\u306e\u5909\u63db\u306e\u5b9a\u7fa9\u306f<strong>torch.nn.Linear<\/strong>\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306b\u3001torch.nn.Linear(4, 3)\u3068\u3059\u308b\u3060\u3051\u3067\u3001\u8a08\u7b97\u306e\u5b9a\u7fa9\u304c\u4f5c\u308c\u307e\u3059<\/p>\n<p>\u5b9f\u969b\u306e\u8a08\u7b97\u306f\u3001forward\u95a2\u6570\u306b\u8a18\u8f09\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>forwad\u95a2\u6570\u306e\u5f15\u6570\u306ex\u306b\u8aac\u660e\u5909\u6570\u304c\u5165\u3063\u3066\u304d\u3066\u3001self.l1\u3067\u51e6\u7406\u3059\u308b\u3053\u3068\u3067\u30013\u3064\u306e\u30c7\u30fc\u30bf\u304c\u51fa\u3066\u304d\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_6.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_6.png\" alt=\"\" width=\"768\" height=\"368\" class=\"aligncenter size-full wp-image-7130\" srcset=\"https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_6.png 768w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_6-600x288.png 600w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_6-300x144.png 300w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><\/p>\n<p>class\u3068\u3044\u3046\u8003\u3048\u65b9\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u77e5\u3089\u306a\u3044\u65b9\u306f\u3053\u3046\u3044\u3063\u305f\u8a18\u8ff0\u3060\u3068\u8a8d\u8b58\u3057\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E3%83%AD%E3%82%B9%E3%81%A8%E6%9C%80%E9%81%A9%E5%8C%96%E9%96%A2%E6%95%B0%E3%82%92%E9%81%B8%E3%81%B6\"><\/span>\u30ed\u30b9\u3068\u6700\u9069\u5316\u95a2\u6570\u3092\u9078\u3076<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u30e2\u30c7\u30eb\u304c\u6c7a\u307e\u3063\u305f\u306e\u3067\u3001\u30ed\u30b9\u3001\u6700\u9069\u5316\u95a2\u6570\u3092\u9078\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 20.669577874818053%;\"><\/td>\n<td style=\"width: 31.477438136826784%;\">\u30e1\u30bd\u30c3\u30c9<\/td>\n<td style=\"width: 47.85298398835517%;\">\u5099\u8003<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 20.669577874818053%;\">\u30ed\u30b9<\/td>\n<td style=\"width: 31.477438136826784%;\">CrossEntropyLoss<\/td>\n<td style=\"width: 47.85298398835517%;\">\u5206\u985e\u306f\u3053\u308c\u3092\u9078\u3093\u3067\u304f\u3060\u3055\u3044\u3002<br \/>\n\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u3069\u308c\u304b1\u3064\u5206\u985e\u3059\u308b\u3068\u304d\u306b\u4f7f\u3044\u307e\u3059\u3002<br \/>\n\u4f8b\u3048\u3070\u30011\u3064\u306e\u753b\u50cf\uff08\u30c7\u30fc\u30bf\uff09\u304b\u3089\u300c\u4eba\u300d\u300c\u8eca\u300d\u306a\u3069\u8907\u6570\u306e\u691c\u77e5\u3067\u306f\u4f7f\u3048\u307e\u305b\u3093\u3002<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 20.669577874818053%;\">\u6700\u9069\u5316\u95a2\u6570<\/td>\n<td style=\"width: 31.477438136826784%;\">SGD(\u78ba\u7387\u7684\u52fe\u914d\u964d\u4e0b\u6cd5)<\/td>\n<td style=\"width: 47.85298398835517%;\">\u4ed6\u306b\u3082\u6700\u9069\u5316\u95a2\u6570\u306f\u8272\u3005\u3042\u308a\u307e\u3059\u3002<br \/>\n\u5b66\u7fd2\u7387\u306flr\u3067\u6307\u5b9a\u3057\u307e\u3059\u304c\u3001\u3053\u3053\u306f\u8272\u3005\u8abf\u6574\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\"># \u5b66\u7fd2\u7387\r\nlr_rate = 0.001\r\n# loss\u306e\u5b9a\u7fa9 \r\ncriterion = torch.nn.CrossEntropyLoss()\r\n# \u6700\u9069\u5316\u95a2\u6570\r\noptimizer = torch.optim.SGD(model.parameters(), lr=lr_rate)<\/pre>\n<p>\u56f3\u3082\u8e0f\u307e\u3048\u3066\u3001\u3069\u3053\u306e\u90e8\u5206\u304b\u3082\u3046\u5c11\u3057\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_7.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_7.png\" alt=\"\" width=\"768\" height=\"243\" class=\"aligncenter size-full wp-image-7131\" srcset=\"https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_7.png 768w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_7-600x190.png 600w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_7-300x95.png 300w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><\/p>\n<p>\u7cbe\u5ea6\u304c\u51fa\u3066\u308b\u304b\u3069\u3046\u304b\u3001<strong>CrossEntropyLoss<\/strong>\u3067loss\u3092\u8a08\u7b97\u3057\u3066\u3001loss\u304c\u5c0f\u3055\u304f\u306a\u308b\u3088\u3046\u306b<strong>SGD<\/strong>\u3067w\u3092\u8abf\u6574\uff08\u6700\u9069\u5316\uff09\u3057\u307e\u3059\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E5%AD%A6%E7%BF%92%E3%81%AE%E3%83%AB%E3%83%BC%E3%83%97\"><\/span>\u5b66\u7fd2\u306e\u30eb\u30fc\u30d7<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u5b66\u7fd2\u3067\u306f\u3001\u6301\u3063\u3066\u3044\u308b\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u4f55\u56de\u304b\u7e70\u308a\u8fd4\u3057\u3066\u3001\u7cbe\u5ea6\u3092\u3042\u3052\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>loss\u7b97\u51fa &gt; \u6700\u9069\u5316\u306e\u7e70\u308a\u8fd4\u3057\u3067\u3059\u306d\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\">loss_history = []\r\nfor epoch in range(5000):\r\n    total_loss = 0\r\n    for x, y in train_loader:\r\n\r\n        # \u5b66\u7fd2\u30b9\u30c6\u30c3\u30d7\r\n        optimizer.zero_grad()\r\n        outputs = model(x)\r\n        loss = criterion(outputs, y)\r\n        loss.backward()\r\n        optimizer.step()\r\n        \r\n        total_loss += loss.item()\r\n        \r\n    loss_history.append(total_loss)\r\n    if (epoch +1) % 100 == 0:\r\n        print(epoch + 1, total_loss)<\/pre>\n<p>optimizer.zero_grad()\u3084loss.backward()\u3001optimizer.step()\u306f\u6c7a\u307e\u308a\u6587\u53e5\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002<\/p>\n<p><a href=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_8.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_8.png\" alt=\"\" width=\"768\" height=\"519\" class=\"aligncenter size-full wp-image-7135\" srcset=\"https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_8.png 768w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_8-600x405.png 600w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_8-300x203.png 300w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><\/p>\n<p>\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u30925000\u56de\u7e70\u308a\u8fd4\u3057\u3066\u3001\u7cbe\u5ea6\u3092\u3042\u3052\u3066\u3044\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5b66\u7fd2\u7387\u3084\u3001\u7e70\u308a\u8fd4\u3057\u6570\u3092\u5909\u66f4\u3057\u3066\u8272\u3005\u8a66\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>loss\u304c\u3061\u3083\u3093\u3068\u4e0b\u304c\u3063\u3066\u3044\u308b\u304b\u3001\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\">import matplotlib.pyplot as plt\r\nplt.plot(loss_history)<\/pre>\n<p><a href=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_9.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_9.png\" alt=\"\" width=\"300\" height=\"205\" class=\"aligncenter size-full wp-image-7134\" \/><\/a><\/p>\n<p>loss\u304c\u3069\u3093\u3069\u3093\u4e0b\u304c\u3063\u3066\u3044\u307e\u3059\u3002\u7cbe\u5ea6\u304c\u4e0a\u304c\u3063\u3066\u3044\u308b\u8a3c\u62e0\u3067\u3059\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E3%83%86%E3%82%B9%E3%83%88\"><\/span>\u30c6\u30b9\u30c8<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u5b66\u7fd2\u304c\u7d42\u308f\u3063\u305f\u3089\u3001\u7cbe\u5ea6\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" title=\"In\">correct = 0\r\ntotal = 0\r\nfor x, y in test_loader:\r\n    outputs = model(x)\r\n    _, predicted = torch.max(outputs.data, 1)\r\n    total += y.size(0)\r\n    correct += (predicted == y).sum().item()\r\nprint('\u6b63\u89e3\u7387', int(correct)\/total*100)<\/pre>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"raw\" title=\"Out\">\u6b63\u89e3\u7387 100.0<\/pre>\n<p>\u7cbe\u5ea6\u306f100%\u3067\u3059\u3002<\/p>\n<p>\u30b3\u30fc\u30c9\u3092\u6355\u6349\u3057\u307e\u3059\u3002<\/p>\n<p>outputs\u306b\u306f\u3001(5, 3)\u306e\u30c7\u30fc\u30bf\u304c\u5165\u308a\u307e\u3059\u3002<\/p>\n<p>5\u306f\u30d0\u30c3\u30c1\u30b5\u30a4\u30ba\uff1d\u30c7\u30fc\u30bf\u6570\u3067\u30013\u306e\u65b9\u304c\u30e2\u30c7\u30eb\u306e\u4e88\u6e2c\u7d50\u679c\u3067\u3059\u3002<\/p>\n<p>\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_10.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_10.png\" alt=\"\" width=\"768\" height=\"147\" class=\"aligncenter size-full wp-image-7132\" srcset=\"https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_10.png 768w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_10-600x115.png 600w, https:\/\/tetsumag.com\/blog\/wp-content\/uploads\/2020\/12\/article_ml9_10-300x57.png 300w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><\/p>\n<p>\u5404\u30c7\u30fc\u30bf\u306e\u6570\u5024\u304c\u4e00\u756a\u5927\u304d\u3044\u3068\u3053\u308d\u304c\u3001\u30e2\u30c7\u30eb\u304c\u4e88\u6e2c\u3057\u305f\u5206\u985e\u7d50\u679c\u3068\u3057\u3066\u306e\u78ba\u7387\u304c\u9ad8\u3044\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>torch.max\u3067\u6700\u5927\u5024\u3092\u6c42\u3081\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_11.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/tetsumag.com\/wp-content\/uploads\/2020\/12\/article_ml9_11.png\" alt=\"\" width=\"300\" height=\"42\" class=\"aligncenter size-full wp-image-7133\" \/><\/a><\/p>\n<p>\u3053\u308c\u304c\u3001\u4e88\u6e2c\u3055\u308c\u305f\u5206\u985e\u7d50\u679c\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092\u3001predected=y(\u7b54\u3048)\u3068\u7167\u5408\u3057\u3066\u3001\u6b63\u89e3\u7387\u3092\u7b97\u51fa\u3057\u307e\u3059\u3002<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"UDhC2is1aF\"><p><a href=\"https:\/\/www.tetsumag.com\/2023\/02\/08\/309\/\">\u3010YOLOv5\u3011\u7269\u4f53\u691c\u51fa\u306e\u7cbe\u5ea6\u3068\u5b66\u7fd2\u7d50\u679c\uff4dAP\u306e\u8aad\u307f\u65b9\u306b\u3064\u3044\u3066<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;\u3010YOLOv5\u3011\u7269\u4f53\u691c\u51fa\u306e\u7cbe\u5ea6\u3068\u5b66\u7fd2\u7d50\u679c\uff4dAP\u306e\u8aad\u307f\u65b9\u306b\u3064\u3044\u3066&#8221; &#8212; \u3066\u3064\u307e\u3050\" 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