{"id":983,"date":"2023-07-28T02:41:13","date_gmt":"2023-07-28T02:41:13","guid":{"rendered":"https:\/\/statorials.org\/cn\/%e8%9f%92%e8%9b%87\/"},"modified":"2023-07-28T02:41:13","modified_gmt":"2023-07-28T02:41:13","slug":"%e8%9f%92%e8%9b%87","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/%e8%9f%92%e8%9b%87\/","title":{"rendered":"\u5982\u4f55\u5728python\u4e2d\u8ba1\u7b97smape"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>\u5bf9\u79f0\u5e73\u5747\u7edd\u5bf9\u767e\u5206\u6bd4\u8bef\u5dee (SMAPE)<\/strong>\u7528\u4e8e\u8861\u91cf\u6a21\u578b\u7684\u9884\u6d4b\u51c6\u786e\u6027\u3002\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\uff1a<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>SMAPE<\/strong> = (1\/n) * \u03a3(|\u9884\u6d4b \u2013 \u5b9e\u9645| \/ ((|\u5b9e\u9645| + |\u9884\u6d4b|)\/2) * 100<\/span><\/p>\n<p><span style=\"color: #000000;\">\u91d1\u5b50\uff1a<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>\u03a3<\/strong> \u2013 \u8868\u793a\u201c\u548c\u201d\u7684\u7b26\u53f7<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>n\u2014\u2014<\/strong>\u6837\u672c\u91cf<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>real\u2014\u2014<\/strong>\u6570\u636e\u7684\u5b9e\u9645\u503c<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u9884\u6d4b<\/strong>\u2014\u2014\u6570\u636e\u7684\u9884\u671f\u503c<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\"><span style=\"color: #000000;\">\u672c\u6559\u7a0b\u4ecb\u7ecd\u5982\u4f55\u5728 Python \u4e2d\u8ba1\u7b97 SMAPE\u3002<\/span><\/span><\/p>\n<h3><strong>\u5982\u4f55\u5728Python\u4e2d\u8ba1\u7b97SMAPE<\/strong><\/h3>\n<p><span style=\"color: #000000;\">\u6ca1\u6709\u5185\u7f6e\u7684 Python \u51fd\u6570\u6765\u8ba1\u7b97 SMAPE\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u7684\u51fd\u6570\u6765\u6267\u884c\u6b64\u64cd\u4f5c\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #107d3f;\">import <span style=\"color: #000000;\">numpy<\/span> as <span style=\"color: #000000;\">np<\/span>\n\n<span style=\"color: #000000;\"><span style=\"color: #008000;\">def<\/span> smape( <span style=\"color: #3366ff;\">a<\/span> , <span style=\"color: #3366ff;\">f<\/span> ):\n    <span style=\"color: #008000;\">return<\/span> 1\/ <span style=\"color: #3366ff;\">len<\/span> (a) * np. <span style=\"color: #3366ff;\">sum<\/span> (2 * np. <span style=\"color: #3366ff;\">abs<\/span> (fa) \/ (np. <span style=\"color: #3366ff;\">abs<\/span> (a) + np. <span style=\"color: #3366ff;\">abs<\/span> (f))*100)\n<\/span><\/span><\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u7136\u540e\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u8be5\u51fd\u6570\u8ba1\u7b97\u4e24\u4e2a\u8868\u7684 SMAPE\uff1a\u4e00\u4e2a\u5305\u542b\u5b9e\u9645\u6570\u636e\u503c\uff0c\u53e6\u4e00\u4e2a\u5305\u542b\u9884\u6d4b\u6570\u636e\u503c\u3002<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define arrays of actual and forecasted data values<\/span>\nactual = np.array([12, 13, 14, 15, 15,22, 27])\nforecast = np.array([11, 13, 14, 14, 15, 16, 18])\n\n<span style=\"color: #008080;\">#calculate SMAPE<\/span>\nsmape(actual, forecast)\n\n12.45302\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u4ece\u7ed3\u679c\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8be5\u6a21\u578b\u7684\u5e73\u5747\u5bf9\u79f0\u7edd\u5bf9\u767e\u5206\u6bd4\u8bef\u5dee\u4e3a<strong>12.45302%<\/strong> \u3002<\/span><\/p>\n<h3><strong><span style=\"color: #000000;\">\u5176\u4ed6\u8d44\u6e90<\/span><\/strong><\/h3>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Symmetric_mean_absolute_percentage_error\" target=\"_blank\" rel=\"noopener noreferrer\">SMAPE \u7684\u7ef4\u57fa\u767e\u79d1\u6761\u76ee<\/a><br \/><a href=\"https:\/\/robjhyndman.com\/hyndsight\/smape\/\" target=\"_blank\" rel=\"noopener noreferrer\">Rob J. Hyndman \u5bf9 SMAPE \u7684\u770b\u6cd5<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/\u87d2\u86c7\u5361\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5982\u4f55\u5728Python\u4e2d\u8ba1\u7b97MAPE<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/r\u5361\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5982\u4f55\u5728 R \u4e2d\u8ba1\u7b97 MAPE<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/excel\u5361\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5982\u4f55\u5728 Excel \u4e2d\u8ba1\u7b97 MAPE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5bf9\u79f0\u5e73\u5747\u7edd\u5bf9\u767e\u5206\u6bd4\u8bef\u5dee (SMAPE)\u7528\u4e8e\u8861\u91cf\u6a21\u578b\u7684\u9884\u6d4b\u51c6\u786e\u6027\u3002\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\uff1a SMAPE = (1\/n) * [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-983","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - 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