{"id":532,"date":"2023-07-22T01:03:49","date_gmt":"2023-07-21T17:03:49","guid":{"rendered":"https:\/\/blog.cirno.fun\/?p=532"},"modified":"2025-03-19T00:32:27","modified_gmt":"2025-03-18T16:32:27","slug":"chap5-%e7%a5%9e%e7%bb%8f%e7%bd%91%e7%bb%9c","status":"publish","type":"post","link":"https:\/\/blog.sssn.tech\/?p=532","title":{"rendered":"[Chap5]-\u795e\u7ecf\u7f51\u7edc"},"content":{"rendered":"<h2>\u4e3a\u4ec0\u4e48\u662f\u795e\u7ecf\u7f51\u7edc<\/h2>\n<p>\u524d\u51e0\u7ae0\u8ba8\u8bba\u4e86\u7ebf\u6027\u56de\u5f52\u548c\u903b\u8f91\u56de\u5f52\u4e24\u79cd\u7b97\u6cd5\uff0c\u4ed6\u4eec\u90fd\u9002\u5408\u89e3\u51b3\u4e0e\u7ebf\u6027\u51fd\u6570\u76f8\u5173\u7684\u95ee\u9898\uff0c\u800c\u4e0d\u64c5\u957f\u89e3\u51b3\u975e\u7ebf\u6027\u7684\u95ee\u9898<\/p>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u4f8b\u5b50<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689957672585.png\" alt=\"file\" \/><\/p>\n<p>\u5728\u5982\u56fe\u7684\u5206\u7c7b\u95ee\u9898\u4e2d\uff0c\u51b3\u7b56\u8fb9\u754c\u53ef\u80fd\u4f1a\u975e\u5e38\u590d\u6742\uff0c\u8fd9\u662f\u53ea\u6709\u4e24\u4e2a\u7279\u5f81x1,x2\u7684\u60c5\u51b5\uff0c\u5982\u679c\u6211\u4eec\u8981\u7528\u903b\u8f91\u56de\u5f52\uff0c\u5c31\u4e0d\u5f97\u4e0d\u7528\u56fe\u4e2d\u53f3\u4fa7\u975e\u5e38\u590d\u6742\u7684\u51fd\u6570\uff0c\u5bf9\u591a\u4e2a\u53c2\u6570\u8fdb\u884c\u56de\u5f52<\/p>\n<p>\u5728\u5b9e\u9645\u60c5\u51b5\u4e2d\uff0c\u7279\u5f81\u53ef\u80fd\u975e\u5e38\u591a\uff0c\u6bd4\u5982\u5728\u8ba1\u7b97\u673a\u89c6\u89c9\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u8981\u8bc6\u522b\u4e00\u5f2050\u00d750\u7684\u7070\u5ea6\u56fe\u50cf\u5185\u5bb9\uff0c\u6b64\u65f6\u6211\u4eec\u5c31\u67092500\u4e2a\u539f\u59cb\u7279\u5f81\uff0c\u800c\u5373\u4f7f\u53ea\u8003\u8651\u4ed6\u4eec\u4e4b\u95f4\u7684\u4e8c\u5143\u7ec4\u5408\uff08\u4e8c\u6b21\u9879\uff09\uff0c\u4e5f\u4f1a\u6709\u63a5\u8fd1300\u4e07\u4e2a\u7279\u5f81\uff0c\u8fd9\u4e0d\u662f\u666e\u901a\u7684\u903b\u8f91\u56de\u5f52\u6a21\u578b\u53ef\u4ee5\u5904\u7406\u7684\u7279\u5f81\u91cf\uff0c\u4e8b\u5b9e\u4e0a\uff0c\u8fd9\u79cd\u95ee\u9898\u9700\u8981\u795e\u7ecf\u7f51\u7edc<\/p>\n<h2>\u4ec0\u4e48\u662f\u795e\u7ecf\u7f51\u7edc<\/h2>\n<p>\u795e\u7ecf\u7f51\u7edc\u5efa\u7acb\u5728\u5f88\u591a\u795e\u7ecf\u5143<strong>\uff08\u4e5f\u53eb\u6fc0\u6d3b\u5355\u5143\uff0cactivation unit<\/strong>\uff09\u4e0a\uff0c\u6bcf\u4e00\u4e2a\u795e\u7ecf\u5143\u90fd\u662f\u4e00\u4e2a\u5b66\u4e60\u6a21\u578b\uff0c\u4e0b\u56fe\u662f\u4e00\u4e2a\u903b\u8f91\u56de\u5f52\u7684\u795e\u7ecf\u5143\u7684\u4f8b\u5b50<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689958321196.png\" alt=\"file\" \/><\/p>\n<p>\u8fd9\u4e2a\u795e\u7ecf\u5143\u67094\u4e2a\u8f93\u5165\uff0c\u4e00\u4e2a\u8f93\u51fa\uff0c\u56de\u5fc6\u903b\u8f91\u56de\u5f52\u7684\u90e8\u5206\uff0cx0\u603b\u662f\u7b49\u4e8e1\u7684\uff08\u7528\u6765\u548ctheta0\u76f8\u4e58\u5f97\u5230\u51fd\u6570\u7684\u5e38\u6570\u9879\uff09\uff0c\u8fd9\u91cc\u53eb\u505a<strong>\u504f\u7f6e\u9879(bias unit)<\/strong>\uff0c\u6709\u65f6\u4f1a\u7701\u7565\u4e0d\u753b<\/p>\n<p>\u5b66\u4e60\u53c2\u6570theta\uff0c\u5728\u8fd9\u91cc\u4e5f\u53eb<strong>\u6743\u91cd\uff08weight\uff09<\/strong>\uff0c\u7ecf\u5e38\u5199\u5230\u8f93\u5165\u7aef\u5230\u795e\u7ecf\u5143\u7684\u8fde\u7ebf\u4e0a<\/p>\n<p>\u73b0\u5728\u89c2\u5bdf\u4e0b\u56fe\u7684\u795e\u7ecf\u7f51\u7edc\u4f8b\u5b50 <img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689958684489.png\" alt=\"file\" \/>\u6700\u5de6\u4fa7\u662f\u4e09\u4e2a<strong>\u8f93\u5165\u5355\u5143\uff08input units\uff09<\/strong>\uff0c\u7528\u6765\u63a5\u6536\u539f\u59cb\u6570\u636e\uff0c\u4e2d\u95f4\u7684a\u662f\u4e2d\u95f4\u5355\u5143\uff0c\u8d1f\u8d23\u6570\u636e\u5904\u7406\uff0c\u7136\u540e\u8f93\u51fa\u5355\u5143\u8d1f\u8d23\u8ba1\u7b97\u548c\u8f93\u51fa<\/p>\n<p>\u8fd9\u4e09\u5c42\u5206\u522b\u79f0\u4f5c\u8f93\u5165\u5c42\uff0c\u9690\u85cf\u5c42\uff0c\u8f93\u51fa\u5c42<\/p>\n<p>\u73b0\u5728\u52a0\u4e0a\u504f\u7f6e\u5355\u5143\u518d\u6765\u770b\u4e00\u4e0b<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689958934350.png\" alt=\"file\" \/><\/p>\n<p>\u65b0\u52a0\u7684\u4e24\u4e2a\u504f\u7f6e\u5355\u5143\u603b\u662f\u7b49\u4e8e1\u7684\uff0c\u6240\u4ee5\u6ce8\u610fx\u4e0d\u4f1a\u5f71\u54cd\u5230a02\u7684\u503c<\/p>\n<p>\u4e0b\u9762\u5f15\u5165\u4e00\u4e9b\u6807\u8bb0\u6cd5\u6765\u5e2e\u52a9\u63cf\u8ff0\u6a21\u578b<\/p>\n<p><code>a_i^{(j)}<\/code>\u8868\u793a\u7b2cj\u5c42\u7684\u7b2ci\u4e2a\u6fc0\u6d3b\u5355\u5143\uff08\u795e\u7ecf\u5143\uff09\uff0c<code>\\theta^{(j)}<\/code>\u8868\u793a\u7b2cj\u5c42\u5230\u7b2cj+1\u5c42\u7684\u6743\u91cd\uff08\u53c2\u6570\uff09\u77e9\u9635\uff0c\u4ed6\u7684\u5f62\u72b6\u5e94\u8be5\u662f\u4ee5j+1\u5c42\u795e\u7ecf\u5143\u6570\u91cf\u4e3a\u884c\u6570\uff0c\u4ee5j\u5c42\u795e\u7ecf\u5143\u6570\u4f4d\u5217\u6570\u7684\uff0c\u5982\u4e0a\u56fe<code>\\theta^{(1)}<\/code>\u7684\u5c3a\u5bf8\u5c31\u662f3\u00d74<\/p>\n<p>\u5bf9\u4e8e\u4e0a\u56fe\u7684\u6a21\u578b\uff0c\u9690\u85cf\u5c42\u548c\u8f93\u51fa\u5c42\u7684\u8868\u8fbe\u5f0f\u662f<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689961406196.png\" alt=\"file\" \/><\/p>\n<p>\u7528\u5411\u91cf\u5316\u6765\u8868\u8fbe<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689961700663.png\" alt=\"file\" \/><\/p>\n<p>\u8fd9\u6837\u4ece\u5de6\u5230\u53f3\u7684\u7b97\u6cd5\u79f0\u4e3a<strong>\u524d\u5411\u4f20\u64ad\u7b97\u6cd5( FORWARD PROPAGATION )<\/strong><\/p>\n<p>\u8fd9\u53ea\u662f\u9488\u5bf9\u8bad\u7ec3\u96c6\u4e2d\u4e00\u4e2a\u8bad\u7ec3\u5b9e\u4f8b\u6240\u8fdb\u884c\u7684\u8ba1\u7b97\u3002\u5982\u679c\u6211\u4eec\u8981\u5bf9\u6574\u4e2a\u8bad\u7ec3\u96c6\u8fdb\u884c\u8ba1\u7b97\uff0c\u6211\u4eec\u9700\u8981\u5c06\u8bad\u7ec3\u96c6\u7279\u5f81\u77e9\u9635\u8fdb\u884c\u8f6c\u7f6e\uff0c\u4f7f\u5f97\u540c\u4e00\u4e2a\u5b9e\u4f8b\u7684\u7279\u5f81\u90fd\u5728\u540c\u4e00\u5217\u91cc\u3002\u5373<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689961742305.png\" alt=\"file\" \/><\/p>\n<p>\u4e3a\u4e86\u66f4\u597d\u7684\u7406\u89e3\u795e\u7ecf\u7f51\u7edc\uff0c\u6211\u4eec\u628a\u4e0a\u56fe\u906e\u4f4f\u4e00\u90e8\u5206<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689961780595.png\" alt=\"file\" \/><\/p>\n<p>\u5176\u5b9e\u795e\u7ecf\u7f51\u7edc\u4e0e\u903b\u8f91\u56de\u5f52\u6709\u5f88\u591a\u76f8\u4f3c\u652f\u6301\uff0c\u53ea\u4e0d\u8fc7\u5728\u795e\u7ecf\u7f51\u7edc\u4e2d\uff0c\u6211\u4eec\u4e0d\u518d\u50cf\u903b\u8f91\u56de\u5f52\u90a3\u6837\u4f7f\u7528\u539f\u59cb\u7279\u5f81\u8bad\u7ec3\uff0c\u800c\u662f\u4f7f\u7528\u524d\u534a\u90e8\u5206\u6a21\u578b\u8bad\u7ec3\u8fc7\u7684\u503c\uff0c\u8fd9\u53ef\u4ee5\u770b\u4f5c\u662f\u66f4\u9ad8\u7ea7\u7684\u7279\u5f81\u503c\uff0c\u5373a\u662fx\u7684\u8fdb\u5316\u4f53\uff0c\u4f5c\u4e3a\u7279\u5f81\u503c\u6765\u8bf4\uff0c\u6bd4x\u7684\u7ebf\u6027\u7ec4\u5408\u8981\u66f4\u52a0\u6709\u6548<\/p>\n<p>\u8fd9\u5c31\u662f\u795e\u7ecf\u7f51\u7edc\u76f8\u6bd4\u4e8e\u903b\u8f91\u56de\u5f52\u548c\u7ebf\u6027\u56de\u5f52\u7684\u4f18\u52bf<\/p>\n<h2>\u51e0\u4e2a\u903b\u8f91\u8fd0\u7b97\u7684\u4f8b\u5b50<\/h2>\n<p>\u4e0b\u9762\u7ed9\u51fa\u51e0\u4e2a\u903b\u8f91\u8fd0\u7b97\u795e\u7ecf\u5143\u7684\u4f8b\u5b50\uff0c\u5982\u4e0b\u56fe\u662fand\u8fd0\u7b97\u7684 <img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689962019316.png\" alt=\"file\" \/><\/p>\n<p>\u7ed3\u5408g(x)\u7684\u51fd\u6570\u56fe\u50cf <img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689962053261.png\" alt=\"file\" \/><\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u5199\u51fa\u771f\u503c\u8868 <img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689962083023.png\" alt=\"file\" \/>\u53ef\u4ee5\u770b\u5230\u795e\u7ecf\u5143\u6a21\u62df\u4e86and\u51fd\u6570\u7684\u529f\u80fd<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689962147529.png\" alt=\"file\" \/><\/p>\n<p>\u795e\u7ecf\u5143\u53ef\u4ee5\u4e92\u76f8\u7ec4\u5408\u6765\u5b9e\u73b0\u590d\u6742\u7684\u903b\u8f91\u8fd0\u7b97\uff0c\u6bd4\u5982XNOR<\/p>\n<p>\u56e0\u4e3a<\/p>\n<pre><code class=\"language-katex\">XNOR=(x1 AND x2)OR((NOT x1)AND(NOT x2))<\/code><\/pre>\n<p>\u6240\u4ee5\u53ef\u4ee5<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689962246752.png\" alt=\"file\" \/><\/p>\n<p>\u4e0a\u56fe\u5c31\u662f\u4e00\u4e2a\u5b9e\u73b0XNOR\u8fd0\u7b97\u7684\u795e\u7ecf\u7f51\u7edc<\/p>\n<h2>\u591a\u5206\u7c7b\u95ee\u9898<\/h2>\n<p>\u5f53\u6211\u4eec\u6709\u4e0d\u6b62\u4e24\u79cd\u5206\u7c7b\u65f6\uff0c\u4f8b\u5982\u6211\u4eec\u8981\u5bf9\u4e00\u4e2a\u56fe\u7247\u505a\u51fa\u884c\u4eba\uff0c\u6c7d\u8f66\uff0c\u6469\u6258\u8f66\u6216\u5361\u8f66\u7684\u56db\u5206\u7c7b\u95ee\u9898\uff0c\u6211\u4eec\u9700\u8981\u5982\u4e0b\u65b9\u6cd5<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/blog.sssn.tech\/wp-content\/uploads\/2023\/07\/image-1689962366888.png\" alt=\"file\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e3a\u4ec0\u4e48\u662f\u795e\u7ecf\u7f51\u7edc \u524d\u51e0\u7ae0\u8ba8\u8bba\u4e86\u7ebf\u6027\u56de\u5f52\u548c\u903b\u8f91\u56de\u5f52\u4e24\u79cd\u7b97\u6cd5\uff0c\u4ed6\u4eec\u90fd\u9002\u5408\u89e3\u51b3\u4e0e\u7ebf\u6027\u51fd [&#8230;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,18],"tags":[],"class_list":["post-532","post","type-post","status-publish","format-standard","hentry","category-11","category-18"],"_links":{"self":[{"href":"https:\/\/blog.sssn.tech\/index.php?rest_route=\/wp\/v2\/posts\/532","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.sssn.tech\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.sssn.tech\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.sssn.tech\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.sssn.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=532"}],"version-history":[{"count":2,"href":"https:\/\/blog.sssn.tech\/index.php?rest_route=\/wp\/v2\/posts\/532\/revisions"}],"predecessor-version":[{"id":833,"href":"https:\/\/blog.sssn.tech\/index.php?rest_route=\/wp\/v2\/posts\/532\/revisions\/833"}],"wp:attachment":[{"href":"https:\/\/blog.sssn.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=532"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.sssn.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=532"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.sssn.tech\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=532"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}