{"id":1422,"date":"2018-07-27T09:44:53","date_gmt":"2018-07-27T01:44:53","guid":{"rendered":"http:\/\/www.tianyuaninfo.com\/wordpress\/?p=1422"},"modified":"2018-07-27T09:44:53","modified_gmt":"2018-07-27T01:44:53","slug":"%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0-bp%e7%a5%9e%e7%bb%8f%e7%bd%91%e7%bb%9c%e6%a8%a1%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/www.tianyuaninfo.com\/?p=1422","title":{"rendered":"\u673a\u5668\u5b66\u4e60\u2014\u2014BP\u795e\u7ecf\u7f51\u7edc\u6a21\u578b"},"content":{"rendered":"<h2>\u4e00\u3001\u4ec0\u4e48\u662fBP<\/h2>\n<div id=\"cnblogs_post_body\">\n<p>BP\uff08Back Propagation\uff09\u7f51\u7edc\u662f1986\u5e74\u7531Rumelhart\u548cMcCelland\u4e3a\u9996\u7684\u79d1\u5b66\u5bb6\u5c0f\u7ec4\u63d0\u51fa\uff0c\u662f\u4e00\u79cd\u6309\u8bef\u5dee\u9006\u4f20\u64ad\u7b97\u6cd5\u8bad\u7ec3\u7684\u591a\u5c42\u524d\u9988\u7f51\u7edc\uff0c\u662f\u76ee\u524d\u5e94\u7528\u6700\u5e7f\u6cdb\u7684\u795e\u7ecf\u7f51\u7edc\u6a21\u578b\u4e4b\u4e00\u3002BP\u7f51\u7edc\u80fd\u5b66\u4e60\u548c\u5b58\u8d2e\u5927\u91cf\u7684\u8f93\u5165-\u8f93\u51fa\u6a21\u5f0f\u6620\u5c04\u5173\u7cfb\uff0c\u800c\u65e0\u9700\u4e8b\u524d\u63ed\u793a\u63cf\u8ff0\u8fd9\u79cd\u6620\u5c04\u5173\u7cfb\u7684\u6570\u5b66\u65b9\u7a0b\u3002\u5b83\u7684\u5b66\u4e60\u89c4\u5219\u662f\u4f7f\u7528\u68af\u5ea6\u4e0b\u964d\u6cd5\uff0c\u901a\u8fc7\u53cd\u5411\u4f20\u64ad\u6765\u4e0d\u65ad\u8c03\u6574\u7f51\u7edc\u7684\u6743\u503c\u548c\u9608\u503c\uff0c\u4f7f\u7f51\u7edc\u7684\u8bef\u5dee\u5e73\u65b9\u548c\u6700\u5c0f\u3002BP\u795e\u7ecf\u7f51\u7edc\u6a21\u578b\u62d3\u6251\u7ed3\u6784\u5305\u62ec\u8f93\u5165\u5c42\uff08input\uff09\u3001\u9690\u5c42(hide layer)\u548c\u8f93\u51fa\u5c42(output layer)\u3002<\/p>\n<p>\u6211\u4eec\u73b0\u5728\u6765\u5206\u6790\u4e0b\u8fd9\u4e9b\u8bdd\uff1a<\/p>\n<ul>\n<li>\u201c\u662f\u4e00\u79cd\u6309\u8bef\u5dee\u9006\u4f20\u64ad\u7b97\u6cd5\u8bad\u7ec3\u7684\u591a\u5c42\u524d\u9988\u7f51\u7edc\u201d<\/li>\n<\/ul>\n<p>BP\u662f\u540e\u5411\u4f20\u64ad\u7684\u82f1\u6587\u7f29\u5199\uff0c\u90a3\u4e48\u4f20\u64ad\u5bf9\u8c61\u662f\u4ec0\u4e48\uff1f\u4f20\u64ad\u7684\u76ee\u7684\u662f\u4ec0\u4e48\uff1f\u4f20\u64ad\u7684\u65b9\u5f0f\u662f\u540e\u5411\uff0c\u53ef\u8fd9\u53c8\u662f\u4ec0\u4e48\u610f\u601d\u5462\u3002<\/p>\n<p>\u4f20\u64ad\u7684\u5bf9\u8c61\u662f\u8bef\u5dee\uff0c\u4f20\u64ad\u7684\u76ee\u7684\u662f\u5f97\u5230\u6240\u6709\u5c42\u7684\u4f30\u8ba1\u8bef\u5dee\uff0c\u540e\u5411\u662f\u8bf4\u7531\u540e\u5c42\u8bef\u5dee\u63a8\u5bfc\u524d\u5c42\u8bef\u5dee\uff1a<\/p>\n<p>\u5373BP\u7684\u601d\u60f3\u53ef\u4ee5\u603b\u7ed3\u4e3a<\/p>\n<div class=\"O1\">\u5229\u7528\u8f93\u51fa\u540e\u7684\u8bef\u5dee\u6765\u4f30\u8ba1\u8f93\u51fa\u5c42\u7684\u76f4\u63a5\u524d\u5bfc\u5c42\u7684\u8bef\u5dee\uff0c\u518d\u7528\u8fd9\u4e2a\u8bef\u5dee\u4f30\u8ba1\u66f4\u524d\u4e00\u5c42\u7684\u8bef\u5dee\uff0c\u5982\u6b64\u4e00\u5c42\u4e00\u5c42\u7684\u53cd\u4f20\u4e0b\u53bb\uff0c\u5c31\u83b7\u5f97\u4e86\u6240\u6709\u5176\u4ed6\u5404\u5c42\u7684\u8bef\u5dee\u4f30\u8ba1\u3002<\/div>\n<ul>\n<li>\u201cBP\u795e\u7ecf\u7f51\u7edc\u6a21\u578b\u62d3\u6251\u7ed3\u6784\u5305\u62ec\u8f93\u5165\u5c42\uff08input\uff09\u3001\u9690\u5c42(hide layer)\u548c\u8f93\u51fa\u5c42(output layer)\u201d<\/li>\n<\/ul>\n<p>\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u6700\u7b80\u5355\u7684\u4e09\u5c42BP\uff1a<\/p>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/18df9f4ce2c6f082b74fd4b37db2aec6-1.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13684\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/18df9f4ce2c6f082b74fd4b37db2aec6-1.jpg\" sizes=\"(max-width: 700px) 100vw, 700px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/18df9f4ce2c6f082b74fd4b37db2aec6-1.jpg 700w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/18df9f4ce2c6f082b74fd4b37db2aec6-1-300x174.jpg 300w\" width=\"700\" height=\"405\" \/><\/a><\/p>\n<ul>\n<li>\u7f51\u7edc\u80fd\u5b66\u4e60\u548c\u5b58\u8d2e\u5927\u91cf\u7684\u8f93\u5165-\u8f93\u51fa\u6a21\u5f0f\u6620\u5c04\u5173\u7cfb\uff0c\u800c\u65e0\u9700\u4e8b\u524d\u63ed\u793a\u63cf\u8ff0\u8fd9\u79cd\u6620\u5c04\u5173\u7cfb\u7684\u6570\u5b66\u65b9\u7a0b\u3002\u201d<\/li>\n<\/ul>\n<p>BP\u5229\u7528\u4e00\u79cd\u79f0\u4e3a\u6fc0\u6d3b\u51fd\u6570\u6765\u63cf\u8ff0\u5c42\u4e0e\u5c42\u8f93\u51fa\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u4ece\u800c\u6a21\u62df\u5404\u5c42\u795e\u7ecf\u5143\u4e4b\u95f4\u7684\u4ea4\u4e92\u53cd\u5e94\u3002<\/p>\n<p>\u6fc0\u6d3b\u51fd\u6570\u5fc5\u987b\u6ee1\u8db3\u5904\u5904\u53ef\u5bfc\u7684\u6761\u4ef6\u3002\u90a3\u4e48\u6bd4\u8f83\u5e38\u7528\u7684\u662f\u4e00\u79cd\u79f0\u4e3aS\u578b\u51fd\u6570\u7684\u6fc0\u6d3b\u51fd\u6570\uff1a<\/p>\n<div><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/e391831ad41209072393d55d71e991ee-1.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13685\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/e391831ad41209072393d55d71e991ee-1.jpg\" sizes=\"(max-width: 536px) 100vw, 536px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/e391831ad41209072393d55d71e991ee-1.jpg 536w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/e391831ad41209072393d55d71e991ee-1-300x115.jpg 300w\" width=\"536\" height=\"205\" \/><\/a><\/div>\n<p>\u90a3\u4e48\u4e0a\u9762\u7684\u51fd\u6570\u4e3a\u4ec0\u4e48\u79f0\u4e3a\u662fS\u578b\u51fd\u6570\u5462\uff1a<\/p>\n<p>\u6211\u4eec\u6765\u770b\u5b83\u7684\u5f62\u6001\u548c\u5b83\u5bfc\u6570\u7684\u5f62\u6001\uff1a<\/p>\n<p>p.s. S\u578b\u51fd\u6570\u7684\u5bfc\u6570\uff1a<\/p>\n<div><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/07a7b2c20af8fd39c30d1968febcbe1a-1.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13687\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/07a7b2c20af8fd39c30d1968febcbe1a-1.jpg\" sizes=\"(max-width: 420px) 100vw, 420px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/07a7b2c20af8fd39c30d1968febcbe1a-1.jpg 420w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/07a7b2c20af8fd39c30d1968febcbe1a-1-300x48.jpg 300w\" width=\"420\" height=\"67\" \/><\/a><\/div>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185502697-1.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13689\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185502697-1.jpg\" sizes=\"(max-width: 717px) 100vw, 717px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185502697-1.jpg 717w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185502697-1-300x277.jpg 300w\" width=\"717\" height=\"663\" \/><\/a><\/p>\n<p>\u795e\u7ecf\u7f51\u7edc\u7684\u5b66\u4e60\u76ee\u7684\uff1a<\/p>\n<div class=\"O1\">\u5e0c\u671b\u80fd\u591f\u5b66\u4e60\u5230\u4e00\u4e2a\u6a21\u578b\uff0c\u80fd\u591f\u5bf9\u8f93\u5165\u8f93\u51fa\u4e00\u4e2a\u6211\u4eec\u671f\u671b\u7684\u8f93\u51fa\u3002<\/div>\n<div class=\"O1\"><\/div>\n<div class=\"O1\">\n<div>\u5b66\u4e60\u7684\u65b9\u5f0f\uff1a<\/div>\n<div>\u5728\u5916\u754c\u8f93\u5165\u6837\u672c\u7684\u523a\u6fc0\u4e0b\u4e0d\u65ad\u6539\u53d8\u7f51\u7edc\u7684\u8fde\u63a5\u6743\u503c<\/div>\n<div><\/div>\n<div>\u5b66\u4e60\u7684\u672c\u8d28\uff1a<\/div>\n<div class=\"O1\">\u5bf9\u5404\u8fde\u63a5\u6743\u503c\u7684\u52a8\u6001\u8c03\u6574<\/div>\n<\/div>\n<p>\u5b66\u4e60\u7684\u6838\u5fc3\uff1a<\/p>\n<p>\u6743\u503c\u8c03\u6574\u89c4\u5219\uff0c\u5373\u5728\u5b66\u4e60\u8fc7\u7a0b\u4e2d\u7f51\u7edc\u4e2d\u5404\u795e\u7ecf\u5143\u7684\u8fde\u63a5\u6743\u53d8\u5316\u6240\u4f9d\u636e\u7684\u4e00\u5b9a\u7684\u8c03\u6574\u89c4\u5219\u3002<\/p>\n<p>\u4e8c\u3001\u6709\u76d1\u7763\u7684BP\u6a21\u578b\u8bad\u7ec3\u8fc7\u7a0b<\/p>\n<p>1. \u601d\u60f3<\/p>\n<p>\u6709\u76d1\u7763\u7684BP\u6a21\u578b\u8bad\u7ec3\u8868\u793a\u6211\u4eec\u6709\u4e00\u4e2a\u8bad\u7ec3\u96c6\uff0c\u5b83\u5305\u62ec\u4e86\uff1a input X \u548c\u5b83\u88ab\u671f\u671b\u62e5\u6709\u7684\u8f93\u51fa output Y<\/p>\n<p>\u6240\u4ee5\u5bf9\u4e8e\u5f53\u524d\u7684\u4e00\u4e2aBP\u6a21\u578b\uff0c\u6211\u4eec\u80fd\u591f\u83b7\u5f97\u5b83\u9488\u5bf9\u4e8e\u8bad\u7ec3\u96c6\u7684\u8bef\u5dee<\/p>\n<p>\u6240\u4ee5BP\u7684\u6838\u5fc3\u601d\u60f3\u5c31\u662f\uff1a\u5c06\u8f93\u51fa\u8bef\u5dee\u4ee5\u67d0\u79cd\u5f62\u5f0f\u901a\u8fc7\u9690\u5c42\u5411\u8f93\u5165\u5c42\u9010\u5c42\u53cd\u4f20\uff0c\u8fd9\u91cc\u7684\u67d0\u79cd\u5f62\u5f0f\u5176\u5b9e\u5c31\u662f\uff1a<\/p>\n<div><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185604231-2.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13697\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185604231-2.jpg\" sizes=\"(max-width: 513px) 100vw, 513px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185604231-2.jpg 513w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185604231-2-300x60.jpg 300w\" width=\"513\" height=\"102\" \/><\/a><\/div>\n<p>\u4e5f\u5c31\u662f\u4e00\u79cd \u201c\u4fe1\u53f7\u7684\u6b63\u5411\u4f20\u64ad \u2014-&gt; \u8bef\u5dee\u7684\u53cd\u5411\u4f20\u64ad\u201d\u7684\u8fc7\u7a0b\uff1a<\/p>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185627668-2.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13704\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185627668-2.jpg\" sizes=\"(max-width: 585px) 100vw, 585px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185627668-2.jpg 585w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185627668-2-300x175.jpg 300w\" width=\"585\" height=\"342\" \/><\/a><\/p>\n<p>2.\u5177\u4f53<\/p>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185721685-3.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13713\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185721685-3.jpg\" sizes=\"(max-width: 521px) 100vw, 521px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185721685-3.jpg 521w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185721685-3-300x196.jpg 300w\" width=\"521\" height=\"341\" \/><\/a><\/p>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185849061-3.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13716\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185849061-3.jpg\" sizes=\"(max-width: 467px) 100vw, 467px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185849061-3.jpg 467w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185849061-3-300x201.jpg 300w\" width=\"467\" height=\"313\" \/><\/a><\/p>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185907889-3.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13719\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185907889-3.jpg\" sizes=\"(max-width: 561px) 100vw, 561px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185907889-3.jpg 561w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185907889-3-300x170.jpg 300w\" width=\"561\" height=\"317\" \/><\/a><\/p>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185938876-3.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13732\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185938876-3.jpg\" sizes=\"(max-width: 535px) 100vw, 535px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185938876-3.jpg 535w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426185938876-3-300x167.jpg 300w\" width=\"535\" height=\"298\" \/><\/a><\/p>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190037080-3.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13751\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190037080-3.jpg\" sizes=\"(max-width: 541px) 100vw, 541px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190037080-3.jpg 541w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190037080-3-300x176.jpg 300w\" width=\"541\" height=\"317\" \/><\/a><\/p>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190010514-3.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13763\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190010514-3.jpg\" sizes=\"(max-width: 469px) 100vw, 469px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190010514-3.jpg 469w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190010514-3-300x219.jpg 300w\" width=\"469\" height=\"342\" \/><\/a><\/p>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190052499-3.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13773\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190052499-3.jpg\" sizes=\"(max-width: 554px) 100vw, 554px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190052499-3.jpg 554w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190052499-3-300x133.jpg 300w\" width=\"554\" height=\"245\" \/><\/a><\/p>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190128765-3.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13777\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190128765-3.jpg\" sizes=\"(max-width: 544px) 100vw, 544px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190128765-3.jpg 544w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190128765-3-300x135.jpg 300w\" width=\"544\" height=\"245\" \/><\/a><\/p>\n<p><a title=\"\" href=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190141769-3.jpg\" data-original-title=\"\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13784\" src=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190141769-3.jpg\" sizes=\"(max-width: 553px) 100vw, 553px\" srcset=\"http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190141769-3.jpg 553w, http:\/\/www.cdadata.com\/wp-content\/uploads\/2017\/03\/20160426190141769-3-300x164.jpg 300w\" width=\"553\" height=\"303\" \/><\/a><\/p>\n<p><a title=\"\" 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