{"id":301,"date":"2023-08-02T22:21:16","date_gmt":"2023-03-19T20:52:18","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/%e3%82%b7%e3%82%b0%e3%83%a2%e3%82%a4%e3%83%89%e6%b4%bb%e6%80%a7%e5%8c%96%e9%96%a2%e6%95%b0%e3%81%aepython%e3%81%ab%e3%82%88%e3%82%8b%e5%ae%9f%e8%a3%85\/"},"modified":"2025-07-31T22:28:26","modified_gmt":"2025-07-31T13:28:26","slug":"%e3%82%b7%e3%82%b0%e3%83%a2%e3%82%a4%e3%83%89%e6%b4%bb%e6%80%a7%e5%8c%96%e9%96%a2%e6%95%b0%e3%81%aepython%e3%81%ab%e3%82%88%e3%82%8b%e5%ae%9f%e8%a3%85","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%82%b7%e3%82%b0%e3%83%a2%e3%82%a4%e3%83%89%e6%b4%bb%e6%80%a7%e5%8c%96%e9%96%a2%e6%95%b0%e3%81%aepython%e3%81%ab%e3%82%88%e3%82%8b%e5%ae%9f%e8%a3%85\/","title":{"rendered":"\u30b7\u30b0\u30e2\u30a4\u30c9\u6d3b\u6027\u5316\u95a2\u6570\u306ePython\u306b\u3088\u308b\u5b9f\u88c5"},"content":{"rendered":"<p>\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u30b7\u30b0\u30e2\u30a4\u30c9\u6d3b\u6027\u5316\u95a2\u6570\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3059\u3002\u30b7\u30b0\u30e2\u30a4\u30c9\u95a2\u6570\u306f\u5e38\u306b0\u304b\u30891\u306e\u9593\u306e\u51fa\u529b\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306e\u5f8c\u3001\u3042\u306a\u305f\u306f\u4ee5\u4e0b\u3092\u7406\u89e3\u3059\u308b\u3067\u3057\u3087\u3046\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>What is an activation function?<\/li>\n<li>How to implement the sigmoid function in python?<\/li>\n<li>How to plot the sigmoid function in python?<\/li>\n<li>Where do we use the sigmoid function?<\/li>\n<li>What are the problems caused by the sigmoid activation function?<\/li>\n<li>Better alternatives to the sigmoid activation.<\/li>\n<\/ul>\n<h2>\u6d3b\u6027\u5316\u95a2\u6570\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h2>\n<p>\u6d3b\u6027\u5316\u95a2\u6570\u3068\u306f\u3001\u30cb\u30e5\u30fc\u30e9\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u51fa\u529b\u3092\u5236\u5fa1\u3059\u308b\u6570\u5b66\u7684\u306a\u95a2\u6570\u3067\u3059\u3002\u6d3b\u6027\u5316\u95a2\u6570\u306f\u3001\u30cb\u30e5\u30fc\u30ed\u30f3\u304c\u767a\u706b\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<p>\u3044\u304f\u3064\u304b\u306e\u4eba\u6c17\u306e\u3042\u308b\u6d3b\u6027\u5316\u95a2\u6570\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Binary Step<\/li>\n<li>Linear<\/li>\n<li>Sigmoid<\/li>\n<li>Tanh<\/li>\n<li>ReLU<\/li>\n<li>Leaky ReLU<\/li>\n<li>Softmax<\/li>\n<\/ul>\n<p>\u6d3b\u6027\u5316\u306f\u30cb\u30e5\u30fc\u30e9\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30e2\u30c7\u30eb\u306e\u51fa\u529b\u306b\u975e\u7dda\u5f62\u6027\u3092\u8ffd\u52a0\u3059\u308b\u5f79\u5272\u3092\u62c5\u3063\u3066\u3044\u307e\u3059\u3002\u6d3b\u6027\u5316\u95a2\u6570\u304c\u306a\u3044\u3068\u3001\u30cb\u30e5\u30fc\u30e9\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306f\u5358\u7d14\u306a\u7dda\u5f62\u56de\u5e30\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u30cb\u30e5\u30fc\u30e9\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u51fa\u529b\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u6570\u5b66\u5f0f\u306f\u6b21\u306e\u901a\u308a\u3067\u3059:<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648440daa94e2bdf7ba3c7\/9-0.png\" alt=\"Sigmoid Activation Function formula\" \/><\/div>\n<p>\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u30b7\u30b0\u30e2\u30a4\u30c9\u6d3b\u6027\u5316\u95a2\u6570\u306b\u7126\u70b9\u3092\u5f53\u3066\u307e\u3059\u3002\u3053\u306e\u95a2\u6570\u306f\u6570\u5b66\u306e\u30b7\u30b0\u30e2\u30a4\u30c9\u95a2\u6570\u304b\u3089\u6d3e\u751f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u95a2\u6570\u306e\u516c\u5f0f\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u3092\u59cb\u3081\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u30b7\u30b0\u30e2\u30a4\u30c9\u6d3b\u6027\u5316\u95a2\u6570\u306e\u516c\u5f0f<\/h2>\n<p>\u6570\u5b66\u7684\u306b\u306f\u3001\u30b7\u30b0\u30e2\u30a4\u30c9\u6d3b\u6027\u5316\u95a2\u6570\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8868\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648440daa94e2bdf7ba3c7\/14-0.png\" alt=\"Formula\" \/><\/div>\n<p>\u5206\u6bcd\u304c\u5e38\u306b1\u3088\u308a\u5927\u304d\u3044\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u306e\u3067\u3001\u51fa\u529b\u306f\u5e38\u306b0\u304b\u30891\u306e\u9593\u306b\u306a\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<h2>Python\u3067\u30b7\u30b0\u30e2\u30a4\u30c9\u6d3b\u6027\u5316\u95a2\u6570\u306e\u5b9f\u88c5\u3092\u884c\u3046\u3002<\/h2>\n<p>\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001Python\u3067\u30b7\u30b0\u30e2\u30a4\u30c9\u6d3b\u6027\u5316\u95a2\u6570\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u3092\u5b66\u3073\u307e\u3059\u3002<\/p>\n<p>Python\u3067\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">import<\/span> numpy <span class=\"token keyword\">as<\/span> np \r\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">sig<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>\r\n <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">\/<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">+<\/span> np<span class=\"token punctuation\">.<\/span>exp<span class=\"token punctuation\">(<\/span><span class=\"token operator\">-<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u3044\u304f\u3064\u304b\u306e\u5165\u529b\u3067\u95a2\u6570\u3092\u5b9f\u884c\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">import<\/span> numpy <span class=\"token keyword\">as<\/span> np \r\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">sig<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>\r\n <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">\/<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">+<\/span> np<span class=\"token punctuation\">.<\/span>exp<span class=\"token punctuation\">(<\/span><span class=\"token operator\">-<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\n\r\nx <span class=\"token operator\">=<\/span> <span class=\"token number\">1.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Sigmoid Activation on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> sig<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\nx <span class=\"token operator\">=<\/span> <span class=\"token operator\">-<\/span><span class=\"token number\">10.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Sigmoid Activation on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> sig<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\nx <span class=\"token operator\">=<\/span> <span class=\"token number\">0.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Sigmoid Activation on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> sig<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\nx <span class=\"token operator\">=<\/span> <span class=\"token number\">15.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Sigmoid Activation on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> sig<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\nx <span class=\"token operator\">=<\/span> <span class=\"token operator\">-<\/span><span class=\"token number\">2.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Sigmoid Activation on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> sig<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\n<\/code><\/pre>\n<p>\u51fa\u529b:<\/p>\n<pre class=\"post-pre\"><code>Applying Sigmoid Activation on (1.0) gives 0.7\r\nApplying Sigmoid Activation on (-10.0) gives 0.0\r\nApplying Sigmoid Activation on (0.0) gives 0.5\r\nApplying Sigmoid Activation on (15.0) gives 1.0\r\nApplying Sigmoid Activation on (-2.0) gives 0.1\r\n<\/code><\/pre>\n<h2>Python\u3092\u4f7f\u7528\u3057\u3066Sigmoid Activation\u3092\u30d7\u30ed\u30c3\u30c8\u3059\u308b<\/h2>\n<p>\u30b7\u30b0\u30e2\u30a4\u30c9\u6d3b\u6027\u5316\u95a2\u6570\u3092\u30d7\u30ed\u30c3\u30c8\u3059\u308b\u305f\u3081\u306b\u3001Numpy\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">import<\/span> numpy <span class=\"token keyword\">as<\/span> np\r\n<span class=\"token keyword\">import<\/span> matplotlib<span class=\"token punctuation\">.<\/span>pyplot <span class=\"token keyword\">as<\/span> plt\r\nx <span class=\"token operator\">=<\/span> np<span class=\"token punctuation\">.<\/span>linspace<span class=\"token punctuation\">(<\/span><span class=\"token operator\">-<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">)<\/span>   \r\np <span class=\"token operator\">=<\/span> sig<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span>\r\nplt<span class=\"token punctuation\">.<\/span>xlabel<span class=\"token punctuation\">(<\/span><span class=\"token string\">\"x\"<\/span><span class=\"token punctuation\">)<\/span> \r\nplt<span class=\"token punctuation\">.<\/span>ylabel<span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Sigmoid(x)\"<\/span><span class=\"token punctuation\">)<\/span>  \r\nplt<span class=\"token punctuation\">.<\/span>plot<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> p<span class=\"token punctuation\">)<\/span> \r\nplt<span class=\"token punctuation\">.<\/span>show<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u51fa\u529b\uff1a<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648440daa94e2bdf7ba3c7\/28-0.png\" alt=\"Sigmoid\" \/><\/div>\n<p>\u51fa\u529b\u304c0\u304b\u30891\u306e\u9593\u306b\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u78ba\u7387\u306f\u5e38\u306b0\u304b\u30891\u306e\u9593\u306b\u3042\u308b\u305f\u3081\u3001\u30b7\u30b0\u30e2\u30a4\u30c9\u95a2\u6570\u306f\u3088\u304f\u78ba\u7387\u306e\u4e88\u6e2c\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u30b7\u30b0\u30e2\u30a4\u30c9\u95a2\u6570\u306e\u6b20\u70b9\u306e1\u3064\u306f\u3001\u7d42\u7aef\u9818\u57df\u3067\u306fY\u5024\u304cX\u5024\u306e\u5909\u5316\u306b\u5bfe\u3057\u3066\u975e\u5e38\u306b\u53cd\u5fdc\u3057\u3065\u3089\u3044\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u6d88\u5931\u52fe\u914d\u554f\u984c\u3068\u3057\u3066\u77e5\u3089\u308c\u308b\u554f\u984c\u304c\u751f\u3058\u307e\u3059\u3002<\/p>\n<p>\u52fe\u914d\u306e\u6d88\u5931\u306f\u5b66\u7fd2\u30d7\u30ed\u30bb\u30b9\u3092\u9045\u304f\u3057\u3001\u3057\u305f\u304c\u3063\u3066\u671b\u307e\u3057\u304f\u306a\u3044\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u554f\u984c\u3092\u514b\u670d\u3059\u308b\u305f\u3081\u306e\u4ee3\u66ff\u6848\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3057\u3087\u3046\u3002 (Kono mondai o kokufuku suru tame no daitan&#8217;an ni tsuite hanashi aimashou.)<\/p>\n<h2>ReLu\uff08Rectified Linear Unit\uff09\u6d3b\u6027\u5316\u95a2\u6570\u3002<\/h2>\n<p>\u52fe\u914d\u6d88\u5931\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u3088\u308a\u826f\u3044\u4ee3\u66ff\u624b\u6bb5\u306f\u3001ReLu\u6d3b\u6027\u5316\u95a2\u6570\u3067\u3059\u3002<\/p>\n<p>ReLu\uff08\u30e9\u30f3\u30d7\uff09\u6d3b\u6027\u5316\u95a2\u6570\u306f\u3001\u5165\u529b\u304c\u8ca0\u306e\u5834\u5408\u306f0\u3092\u8fd4\u3057\u3001\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f\u5165\u529b\u5024\u3092\u305d\u306e\u307e\u307e\u8fd4\u3059\u3002<\/p>\n<p>\u6570\u5b66\u7684\u306b\u8868\u3055\u308c\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648440daa94e2bdf7ba3c7\/39-0.png\" alt=\"Relu\" \/><\/div>\n<p>Python\u3067\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">def<\/span> <span class=\"token function\">relu<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token builtin\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0.0<\/span><span class=\"token punctuation\">,<\/span> x<span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u3044\u304f\u3064\u304b\u306e\u5165\u529b\u306b\u5bfe\u3057\u3066\u3001\u3069\u306e\u3088\u3046\u306b\u52d5\u4f5c\u3059\u308b\u304b\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">def<\/span> <span class=\"token function\">relu<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token builtin\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0.0<\/span><span class=\"token punctuation\">,<\/span> x<span class=\"token punctuation\">)<\/span>\r\n \r\nx <span class=\"token operator\">=<\/span> <span class=\"token number\">1.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Relu on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> relu<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\nx <span class=\"token operator\">=<\/span> <span class=\"token operator\">-<\/span><span class=\"token number\">10.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Relu on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> relu<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\nx <span class=\"token operator\">=<\/span> <span class=\"token number\">0.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Relu on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> relu<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\nx <span class=\"token operator\">=<\/span> <span class=\"token number\">15.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Relu on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> relu<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\nx <span class=\"token operator\">=<\/span> <span class=\"token operator\">-<\/span><span class=\"token number\">20.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Relu on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> relu<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u51fa\u529b:<\/p>\n<pre class=\"post-pre\"><code>Applying Relu on (1.0) gives 1.0\r\nApplying Relu on (-10.0) gives 0.0\r\nApplying Relu on (0.0) gives 0.0\r\nApplying Relu on (15.0) gives 15.0\r\nApplying Relu on (-20.0) gives 0.0\r\n<\/code><\/pre>\n<p>ReLu\u306b\u554f\u984c\u304c\u3042\u308b\u306e\u306f\u3001\u8ca0\u306e\u5165\u529b\u306b\u5bfe\u3059\u308b\u52fe\u914d\u304c\u30bc\u30ed\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u518d\u3073\u3001\u8ca0\u306e\u5165\u529b\u306b\u5bfe\u3057\u3066\u6d88\u5931\u52fe\u914d\uff08\u30bc\u30ed\u52fe\u914d\uff09\u306e\u554f\u984c\u306b\u7e4b\u304c\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u306b\u3001\u79c1\u305f\u3061\u306b\u306f\u5225\u306e\u9078\u629e\u80a2\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u306f\u30ea\u30fc\u30afReLU\u6d3b\u6027\u5316\u95a2\u6570\u3068\u3057\u3066\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30ea\u30fc\u30ad\u30fcReLU\u6d3b\u6027\u5316\u95a2\u6570<\/h2>\n<p>\u30ea\u30fc\u30afReLU\u306f\u3001\u8ca0\u306e\u5024\u306b\u5bfe\u3057\u3066\u975e\u5e38\u306b\u5c0f\u3055\u306a\u7dda\u5f62\u6210\u5206\u306ex\u3092\u4e0e\u3048\u308b\u3053\u3068\u3067\u3001\u30bc\u30ed\u52fe\u914d\u306e\u554f\u984c\u306b\u5bfe\u51e6\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u6570\u5b66\u7684\u306b\u306f\u3001\u305d\u308c\u3092\u6b21\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 (S\u016bgakuteki ni wa, sore o tsugi no y\u014d ni teigi suru koto ga dekimasu.)<\/p>\n<pre class=\"post-pre\"><code>f<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">.<\/span>01x<span class=\"token punctuation\">,<\/span> x<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span>\r\n    <span class=\"token operator\">=<\/span> x<span class=\"token punctuation\">,<\/span>   x<span class=\"token operator\">&gt;=<\/span><span class=\"token number\">0<\/span>\r\n<\/code><\/pre>\n<p>Python\u3092\u4f7f\u7528\u3057\u3066\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">def<\/span> <span class=\"token function\">leaky_relu<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>\r\n  <span class=\"token keyword\">if<\/span> x<span class=\"token operator\">&gt;<\/span><span class=\"token number\">0<\/span> <span class=\"token punctuation\">:<\/span>\r\n    <span class=\"token keyword\">return<\/span> x\r\n  <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">:<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0.01<\/span><span class=\"token operator\">*<\/span>x\r\n  \r\nx <span class=\"token operator\">=<\/span> <span class=\"token number\">1.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Leaky Relu on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> leaky_relu<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\nx <span class=\"token operator\">=<\/span> <span class=\"token operator\">-<\/span><span class=\"token number\">10.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Leaky Relu on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> leaky_relu<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\nx <span class=\"token operator\">=<\/span> <span class=\"token number\">0.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Leaky Relu on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> leaky_relu<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\nx <span class=\"token operator\">=<\/span> <span class=\"token number\">15.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Leaky Relu on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> leaky_relu<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\nx <span class=\"token operator\">=<\/span> <span class=\"token operator\">-<\/span><span class=\"token number\">20.0<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Applying Leaky Relu on (%.1f) gives %.1f'<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> leaky_relu<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u51fa\u529b\uff1a<\/p>\n<pre class=\"post-pre\"><code>Applying Leaky Relu on (1.0) gives 1.0\r\nApplying Leaky Relu on (-10.0) gives -0.1\r\nApplying Leaky Relu on (0.0) gives 0.0\r\nApplying Leaky Relu on (15.0) gives 15.0\r\nApplying Leaky Relu on (-20.0) gives -0.2\r\n<\/code><\/pre>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306f\u30b7\u30b0\u30e2\u30a4\u30c9\u6d3b\u6027\u5316\u95a2\u6570\u306b\u3064\u3044\u3066\u3067\u3057\u305f\u3002\u79c1\u305f\u3061\u306f\u3001\u305d\u306e\u95a2\u6570\u3092Python\u3067\u5b9f\u88c5\u3057\u3066\u30d7\u30ed\u30c3\u30c8\u3059\u308b\u65b9\u6cd5\u3092\u5b66\u3073\u307e\u3057\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u30b7\u30b0\u30e2\u30a4\u30c9\u6d3b\u6027\u5316\u95a2\u6570\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3059\u3002\u30b7\u30b0\u30e2\u30a4\u30c9\u95a2\u6570\u306f\u5e38\u306b0\u304b\u30891\u306e\u9593\u306e\u51fa\u529b\u3092\u8fd4\u3057\u307e\u3059\u3002 \u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306e\u5f8c\u3001\u3042\u306a\u305f\u306f\u4ee5\u4e0b\u3092\u7406\u89e3\u3059\u308b\u3067\u3057\u3087\u3046\uff1a What is an activation fu [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[31,26],"class_list":["post-301","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-python","tag-26"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u30b7\u30b0\u30e2\u30a4\u30c9\u6d3b\u6027\u5316\u95a2\u6570\u306ePython\u306b\u3088\u308b\u5b9f\u88c5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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