“`”<\/p>\n
<h2>1 \u4eba\u5de5\u795e\u7ecf\u7f51\u7edc<\/h2><\/p>\n
<h3>1.1 \u795e\u7ecf\u5143 <\/h3><\/p>\n
\u795e\u7ecf\u7f51\u7edc\u7531\u5927\u91cf\u7684\u795e\u7ecf\u5143\u76f8\u4e92\u8fde\u63a5\u800c\u6210\u3002\u6bcf\u4e2a\u795e\u7ecf\u5143\u63a5\u53d7\u7ebf\u6027\u7ec4\u5408\u7684\u8f93\u5165\u540e\uff0c\u6700\u5f00\u59cb\u53ea\u662f\u7b80\u5355\u7684\u7ebf\u6027\u52a0\u6743\uff0c\u540e\u6765\u7ed9\u6bcf\u4e2a\u795e\u7ecf\u5143\u52a0\u4e0a\u4e86\u975e\u7ebf\u6027\u7684\u6fc0\u6d3b\u51fd\u6570\uff0c\u4ece\u800c\u8fdb\u884c\u975e\u7ebf\u6027\u53d8\u6362\u540e\u8f93\u51fa\u3002\u6bcf\u4e24\u4e2a\u795e\u7ecf\u5143\u4e4b\u95f4\u7684\u8fde\u63a5\u4ee3\u8868\u52a0\u6743\u503c\uff0c\u79f0\u4e4b\u4e3a\u6743\u91cd\uff08weight\uff09\u3002\u4e0d\u540c\u7684\u6743\u91cd\u548c\u6fc0\u6d3b\u51fd\u6570\uff0c\u5219\u4f1a\u5bfc\u81f4\u795e\u7ecf\u7f51\u7edc\u4e0d\u540c\u7684\u8f93\u51fa\u3002 \u4e3e\u4e2a\u624b\u5199\u8bc6\u522b\u7684\u4f8b\u5b50\uff0c\u7ed9\u5b9a\u4e00\u4e2a\u672a\u77e5\u6570\u5b57\uff0c\u8ba9\u795e\u7ecf\u7f51\u7edc\u8bc6\u522b\u662f\u4ec0\u4e48\u6570\u5b57\u3002\u6b64\u65f6\u7684\u795e\u7ecf\u7f51\u7edc\u7684\u8f93\u5165\u7531\u4e00\u7ec4\u88ab\u8f93\u5165\u56fe\u50cf\u7684\u50cf\u7d20\u6240\u6fc0\u6d3b\u7684\u8f93\u5165\u795e\u7ecf\u5143\u6240\u5b9a\u4e49\u3002\u5728\u901a\u8fc7\u975e\u7ebf\u6027\u6fc0\u6d3b\u51fd\u6570\u8fdb\u884c\u975e\u7ebf\u6027\u53d8\u6362\u540e\uff0c\u795e\u7ecf\u5143\u88ab\u6fc0\u6d3b\u7136\u540e\u88ab\u4f20\u9012\u5230\u5176\u4ed6\u795e\u7ecf\u5143\u3002\u91cd\u590d\u8fd9\u4e00\u8fc7\u7a0b\uff0c\u76f4\u5230\u6700\u540e\u4e00\u4e2a\u8f93\u51fa\u795e\u7ecf\u5143\u88ab\u6fc0\u6d3b\u3002\u4ece\u800c\u8bc6\u522b\u5f53\u524d\u6570\u5b57\u662f\u4ec0\u4e48\u5b57\u3002 \u795e\u7ecf\u7f51\u7edc\u7684\u6bcf\u4e2a\u795e\u7ecf\u5143\u5982\u4e0b<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764270_334.png""><\/p>\n
\u57fa\u672cwx + b\u7684\u5f62\u5f0f\uff0c\u5176\u4e2d x1\u3001x2\u8868\u793a\u8f93\u5165\u5411\u91cf w1\u3001w2\u4e3a\u6743\u91cd\uff0c\u51e0\u4e2a\u8f93\u5165\u5219\u610f\u5473\u7740\u6709\u51e0\u4e2a\u6743\u91cd\uff0c\u5373\u6bcf\u4e2a\u8f93\u5165\u90fd\u88ab\u8d4b\u4e88\u4e00\u4e2a\u6743\u91cd b\u4e3a\u504f\u7f6ebias g(z) \u4e3a\u6fc0\u6d3b\u51fd\u6570 a \u4e3a\u8f93\u51fa \u5982\u679c\u53ea\u662f\u4e0a\u9762\u8fd9\u6837\u4e00\u8bf4\uff0c\u4f30\u8ba1\u4ee5\u524d\u6ca1\u63a5\u89e6\u8fc7\u7684\u5341\u6709\u516b\u4e5d\u53c8\u5fc5\u5b9a\u8ff7\u7cca\u4e86\u3002\u4e8b\u5b9e\u4e0a\uff0c\u4e0a\u8ff0\u7b80\u5355\u6a21\u578b\u53ef\u4ee5\u8ffd\u6eaf\u523020\u4e16\u7eaa50\/60\u5e74\u4ee3\u7684\u611f\u77e5\u5668\uff0c\u53ef\u4ee5\u628a\u611f\u77e5\u5668\u7406\u89e3\u4e3a\u4e00\u4e2a\u6839\u636e\u4e0d\u540c\u56e0\u7d20\u3001\u4ee5\u53ca\u5404\u4e2a\u56e0\u7d20\u7684\u91cd\u8981\u6027\u7a0b\u5ea6\u800c\u505a\u51b3\u7b56\u7684\u6a21\u578b\u3002 \u4e3e\u4e2a\u4f8b\u5b50\uff0c\u8fd9\u5468\u672b\u5317\u4eac\u6709\u4e00\u8349\u8393\u97f3\u4e50\u8282\uff0c\u90a3\u53bb\u4e0d\u53bb\u5462\uff1f\u51b3\u5b9a\u4f60\u662f\u5426\u53bb\u6709\u4e8c\u4e2a\u56e0\u7d20\uff0c\u8fd9\u4e8c\u4e2a\u56e0\u7d20\u53ef\u4ee5\u5bf9\u5e94\u4e8c\u4e2a\u8f93\u5165\uff0c\u5206\u522b\u7528x1\u3001x2\u8868\u793a\u3002\u6b64\u5916\uff0c\u8fd9\u4e8c\u4e2a\u56e0\u7d20\u5bf9\u505a\u51b3\u7b56\u7684\u5f71\u54cd\u7a0b\u5ea6\u4e0d\u4e00\u6837\uff0c\u5404\u81ea\u7684\u5f71\u54cd\u7a0b\u5ea6\u7528\u6743\u91cdw1\u3001w2\u8868\u793a\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u97f3\u4e50\u8282\u7684\u6f14\u5531\u5609\u5bbe\u4f1a\u975e\u5e38\u5f71\u54cd\u4f60\u53bb\u4e0d\u53bb\uff0c\u5531\u5f97\u597d\u7684\u524d\u63d0\u4e0b \u5373\u4fbf\u6ca1\u4eba\u966a\u540c\u90fd\u53ef\u5fcd\u53d7\uff0c\u4f46\u5982\u679c\u5531\u5f97\u4e0d\u597d\u8fd8\u4e0d\u5982\u4f60\u4e0a\u53f0\u5531\u5462\u3002\u6240\u4ee5\uff0c\u6211\u4eec\u53ef\u4ee5\u5982\u4e0b\u8868\u793a\uff1a x1\uff1a\u662f\u5426\u6709\u559c\u6b22\u7684\u6f14\u5531\u5609\u5bbe\u3002x1 = 1 \u4f60\u559c\u6b22\u8fd9\u4e9b\u5609\u5bbe\uff0cx1 = 0 \u4f60\u4e0d\u559c\u6b22\u8fd9\u4e9b\u5609\u5bbe\u3002\u5609\u5bbe\u56e0\u7d20\u7684\u6743\u91cdw1 = 7 x2\uff1a\u662f\u5426\u6709\u4eba\u966a\u4f60\u540c\u53bb\u3002x2 = 1 \u6709\u4eba\u966a\u4f60\u540c\u53bb\uff0cx2 = 0 \u6ca1\u4eba\u966a\u4f60\u540c\u53bb\u3002\u662f\u5426\u6709\u4eba\u966a\u540c\u7684\u6743\u91cdw2 = 3\u3002 \u8fd9\u6837\uff0c\u54b1\u4eec\u7684\u51b3\u7b56\u6a21\u578b\u4fbf\u5efa\u7acb\u8d77\u6765\u4e86\uff1ag(z) = g(w1<em>x1 + w2<\/em>x2 + b )\uff0cg\u8868\u793a\u6fc0\u6d3b\u51fd\u6570\uff0c\u8fd9\u91cc\u7684b\u53ef\u4ee5\u7406\u89e3\u6210 \u4e3a\u66f4\u597d\u8fbe\u5230\u76ee\u6807\u800c\u505a\u8c03\u6574\u7684\u504f\u7f6e\u9879\u3002 \u4e00\u5f00\u59cb\u4e3a\u4e86\u7b80\u5355\uff0c\u4eba\u4eec\u628a\u6fc0\u6d3b\u51fd\u6570\u5b9a\u4e49\u6210\u4e00\u4e2a\u7ebf\u6027\u51fd\u6570\uff0c\u5373\u5bf9\u4e8e\u7ed3\u679c\u505a\u4e00\u4e2a\u7ebf\u6027\u53d8\u5316\uff0c\u6bd4\u5982\u4e00\u4e2a\u7b80\u5355\u7684\u7ebf\u6027\u6fc0\u6d3b\u51fd\u6570\u662fg(z) = z\uff0c\u8f93\u51fa\u90fd\u662f\u8f93\u5165\u7684\u7ebf\u6027\u53d8\u6362\u3002\u540e\u6765\u5b9e\u9645\u5e94\u7528\u4e2d\u53d1\u73b0\uff0c\u7ebf\u6027\u6fc0\u6d3b\u51fd\u6570\u592a\u8fc7\u5c40\u9650\uff0c\u4e8e\u662f\u4eba\u4eec\u5f15\u5165\u4e86\u975e\u7ebf\u6027\u6fc0\u6d3b\u51fd\u6570\u3002<\/p><\/p>\n
<h3>1.2 \u6fc0\u6d3b\u51fd\u6570<\/h3><\/p>\n
\u5e38\u7528\u7684\u975e\u7ebf\u6027\u6fc0\u6d3b\u51fd\u6570\u6709sigmoid\u3001tanh\u3001relu\u7b49\u7b49\uff0c\u524d\u4e24\u8005sigmoid\/tanh\u6bd4\u8f83\u5e38\u89c1\u4e8e\u5168\u8fde\u63a5\u5c42\uff0c\u540e\u8005relu\u5e38\u89c1\u4e8e\u5377\u79ef\u5c42\u3002\u8fd9\u91cc\u5148\u7b80\u8981\u4ecb\u7ecd\u4e0b\u6700\u57fa\u7840\u7684sigmoid\u51fd\u6570\uff08btw\uff0c\u5728\u672c\u535a\u5ba2\u4e2dSVM\u90a3\u7bc7\u6587\u7ae0\u5f00\u5934\u6709\u63d0\u8fc7\uff09\u3002 sigmoid\u7684\u51fd\u6570\u8868\u8fbe\u5f0f\u5982\u4e0b<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764421_303.png""> <\/p>\n
\u00a0<\/p>\n
\u5176\u4e2dz\u662f\u4e00\u4e2a\u7ebf\u6027\u7ec4\u5408\uff0c\u6bd4\u5982z\u53ef\u4ee5\u7b49\u4e8e\uff1ab + w1<em>x1 + w2<\/em>x2\u3002\u901a\u8fc7\u4ee3\u5165\u5f88\u5927\u7684\u6b63\u6570\u6216\u5f88\u5c0f\u7684\u8d1f\u6570\u5230g(z)\u51fd\u6570\u4e2d\u53ef\u77e5\uff0c\u5176\u7ed3\u679c\u8d8b\u8fd1\u4e8e0\u62161\u3002 \u56e0\u6b64\uff0csigmoid\u51fd\u6570g(z)\u7684\u56fe\u5f62\u8868\u793a\u5982\u4e0b\uff08 \u6a2a\u8f74\u8868\u793a\u5b9a\u4e49\u57dfz\uff0c\u7eb5\u8f74\u8868\u793a\u503c\u57dfg(z) \uff09\uff1a<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764454_682.jpg""> <\/p>\n
\u4e5f\u5c31\u662f\u8bf4\uff0csigmoid\u51fd\u6570\u7684\u529f\u80fd\u662f\u76f8\u5f53\u4e8e\u628a\u4e00\u4e2a\u5b9e\u6570\u538b\u7f29\u81f30\u52301\u4e4b\u95f4\u3002\u5f53z\u662f\u975e\u5e38\u5927\u7684\u6b63\u6570\u65f6\uff0cg(z)\u4f1a\u8d8b\u8fd1\u4e8e1\uff0c\u800cz\u662f\u975e\u5e38\u5c0f\u7684\u8d1f\u6570\u65f6\uff0c\u5219g(z)\u4f1a\u8d8b\u8fd1\u4e8e0\u3002 \u538b\u7f29\u81f30\u52301\u6709\u4f55\u7528\u5904\u5462\uff1f\u7528\u5904\u662f\u8fd9\u6837\u4e00\u6765\u4fbf\u53ef\u4ee5\u628a\u6fc0\u6d3b\u51fd\u6570\u770b\u4f5c\u4e00\u79cd\u201c\u5206\u7c7b\u7684\u6982\u7387\u201d\uff0c\u6bd4\u5982\u6fc0\u6d3b\u51fd\u6570\u7684\u8f93\u51fa\u4e3a0.9\u7684\u8bdd\u4fbf\u53ef\u4ee5\u89e3\u91ca\u4e3a90%\u7684\u6982\u7387\u4e3a\u6b63\u6837\u672c\u3002 \u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5982\u4e0b\u56fe\uff08\u56fe\u5f15\u81eaStanford\u673a\u5668\u5b66\u4e60\u516c\u5f00\u8bfe\uff09<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764516_976.png""> <\/p>\n
\u00a0<\/p>\n
z = b + w1<em>x1 + w2<\/em>x2\uff0c\u5176\u4e2db\u4e3a\u504f\u7f6e\u9879 \u5047\u5b9a\u53d6-30\uff0cw1\u3001w2\u90fd\u53d6\u4e3a20 <\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764562_932.jpg""> <\/p>\n
\u00a0<\/p>\n
\u5982\u679cx1 = 0 x2 = 0\uff0c\u5219z = -30\uff0cg(z) = 1\/( 1 + e^-z )\u8d8b\u8fd1\u4e8e0\u3002\u6b64\u5916\uff0c\u4ece\u4e0a\u56fesigmoid\u51fd\u6570\u7684\u56fe\u5f62\u4e0a\u4e5f\u53ef\u4ee5\u770b\u51fa\uff0c\u5f53z=-30\u7684\u65f6\u5019\uff0cg(z)\u7684\u503c\u8d8b\u8fd1\u4e8e0 \u5982\u679cx1 = 0 x2 = 1\uff0c\u6216x1 =1 x2 = 0\uff0c\u5219z = b + w1<em>x1 + w2<\/em>x2 = -30 + 20 = -10\uff0c\u540c\u6837\uff0cg(z)\u7684\u503c\u8d8b\u8fd1\u4e8e0 \u5982\u679cx1 = 1 x2 = 1\uff0c\u5219z = b + w1<em>x1 + w2<\/em>x2 = -30 + 20<em>1 + 20<\/em>1 = 10\uff0c\u6b64\u65f6\uff0cg(z)\u8d8b\u8fd1\u4e8e1\u3002 \u6362\u8a00\u4e4b\uff0c\u53ea\u6709\u548c\u90fd\u53d61\u7684\u65f6\u5019\uff0cg(z)\u21921\uff0c\u5224\u5b9a\u4e3a\u6b63\u6837\u672c\uff1b\u6216\u53d60\u7684\u65f6\u5019\uff0cg(z)\u21920\uff0c\u5224\u5b9a\u4e3a\u8d1f\u6837\u672c\uff0c\u5982\u6b64\u8fbe\u5230\u5206\u7c7b\u7684\u76ee\u7684\u3002<\/p>\n
1.3 \u795e\u7ecf\u7f51\u7edc \u5c06\u4e0b\u56fe\u7684\u8fd9\u79cd\u5355\u4e2a\u795e\u7ecf\u5143<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764664_457.png""> <\/p>\n
\u7ec4\u7ec7\u5728\u4e00\u8d77\uff0c\u4fbf\u5f62\u6210\u4e86\u795e\u7ecf\u7f51\u7edc\u3002\u4e0b\u56fe\u4fbf\u662f\u4e00\u4e2a\u4e09\u5c42\u795e\u7ecf\u7f51\u7edc\u7ed3\u6784 <\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764679_794.png""> <\/p>\n
\u4e0a\u56fe\u4e2d\u6700\u5de6\u8fb9\u7684\u539f\u59cb\u8f93\u5165\u4fe1\u606f\u79f0\u4e4b\u4e3a\u8f93\u5165\u5c42\uff0c\u6700\u53f3\u8fb9\u7684\u795e\u7ecf\u5143\u79f0\u4e4b\u4e3a\u8f93\u51fa\u5c42\uff08\u4e0a\u56fe\u4e2d\u8f93\u51fa\u5c42\u53ea\u6709\u4e00\u4e2a\u795e\u7ecf\u5143\uff09\uff0c\u4e2d\u95f4\u7684\u53eb\u9690\u85cf\u5c42\u3002 \u5565\u53eb\u8f93\u5165\u5c42\u3001\u8f93\u51fa\u5c42\u3001\u9690\u85cf\u5c42\u5462\uff1f \u8f93\u5165\u5c42\uff08Input layer\uff09\uff0c\u4f17\u591a\u795e\u7ecf\u5143\uff08Neuron\uff09\u63a5\u53d7\u5927\u91cf\u975e\u7ebf\u5f62\u8f93\u5165\u8baf\u606f\u3002\u8f93\u5165\u7684\u8baf\u606f\u79f0\u4e3a\u8f93\u5165\u5411\u91cf\u3002 \u8f93\u51fa\u5c42\uff08Output layer\uff09\uff0c\u8baf\u606f\u5728\u795e\u7ecf\u5143\u94fe\u63a5\u4e2d\u4f20\u8f93\u3001\u5206\u6790\u3001\u6743\u8861\uff0c\u5f62\u6210\u8f93\u51fa\u7ed3\u679c\u3002\u8f93\u51fa\u7684\u8baf\u606f\u79f0\u4e3a\u8f93\u51fa\u5411\u91cf\u3002 \u9690\u85cf\u5c42\uff08Hidden layer\uff09\uff0c\u7b80\u79f0\u201c\u9690\u5c42\u201d\uff0c\u662f\u8f93\u5165\u5c42\u548c\u8f93\u51fa\u5c42\u4e4b\u95f4\u4f17\u591a\u795e\u7ecf\u5143\u548c\u94fe\u63a5\u7ec4\u6210\u7684\u5404\u4e2a\u5c42\u9762\u3002\u5982\u679c\u6709\u591a\u4e2a\u9690\u85cf\u5c42\uff0c\u5219\u610f\u5473\u7740\u591a\u4e2a\u6fc0\u6d3b\u51fd\u6570\u3002 \u540c\u65f6\uff0c\u6bcf\u4e00\u5c42\u90fd\u53ef\u80fd\u7531\u5355\u4e2a\u6216\u591a\u4e2a\u795e\u7ecf\u5143\u7ec4\u6210\uff0c\u6bcf\u4e00\u5c42\u7684\u8f93\u51fa\u5c06\u4f1a\u4f5c\u4e3a\u4e0b\u4e00\u5c42\u7684\u8f93\u5165\u6570\u636e\u3002\u6bd4\u5982\u4e0b\u56fe\u4e2d\u95f4\u9690\u85cf\u5c42\u6765\u8bf4\uff0c\u9690\u85cf\u5c42\u76843\u4e2a\u795e\u7ecf\u5143a1\u3001a2\u3001a3\u7686\u5404\u81ea\u63a5\u53d7\u6765\u81ea\u591a\u4e2a\u4e0d\u540c\u6743\u91cd\u7684\u8f93\u5165\uff08\u56e0\u4e3a\u6709x1\u3001x2\u3001x3\u8fd9\u4e09\u4e2a\u8f93\u5165\uff0c\u6240\u4ee5a1 a2 a3\u90fd\u4f1a\u63a5\u53d7x1 x2 x3\u5404\u81ea\u5206\u522b\u8d4b\u4e88\u7684\u6743\u91cd\uff0c\u5373\u51e0\u4e2a\u8f93\u5165\u5219\u51e0\u4e2a\u6743\u91cd\uff09\uff0c\u63a5\u7740\uff0ca1\u3001a2\u3001a3\u53c8\u5728\u81ea\u8eab\u5404\u81ea\u4e0d\u540c\u6743\u91cd\u7684\u5f71\u54cd\u4e0b \u6210\u4e3a\u7684\u8f93\u51fa\u5c42\u7684\u8f93\u5165\uff0c\u6700\u7ec8\u7531\u8f93\u51fa\u5c42\u8f93\u51fa\u6700\u7ec8\u7ed3\u679c\u3002 <\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764767_233.png""> <\/p>\n
\u4e0a\u56fe\uff08\u56fe\u5f15\u81eaStanford\u673a\u5668\u5b66\u4e60\u516c\u5f00\u8bfe\uff09\u4e2d \u8868\u793a\u7b2cj\u5c42\u7b2ci\u4e2a\u5355\u5143\u7684\u6fc0\u6d3b\u51fd\u6570\/\u795e\u7ecf\u5143 \u8868\u793a\u4ece\u7b2cj\u5c42\u6620\u5c04\u5230\u7b2cj+1\u5c42\u7684\u63a7\u5236\u51fd\u6570\u7684\u6743\u91cd\u77e9\u9635 \u6b64\u5916\uff0c\u8f93\u5165\u5c42\u548c\u9690\u85cf\u5c42\u90fd\u5b58\u5728\u4e00\u4e2a\u504f\u7f6e\uff08bias unit)\uff0c\u6240\u4ee5\u4e0a\u56fe\u4e2d\u4e5f\u589e\u52a0\u4e86\u504f\u7f6e\u9879\uff1ax0\u3001a0\u3002\u9488\u5bf9\u4e0a\u56fe\uff0c\u6709\u5982\u4e0b\u516c\u5f0f <\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516770180_891.png""> <\/p>\n
\u6b64\u5916\uff0c\u4e0a\u6587\u4e2d\u8bb2\u7684\u90fd\u662f\u4e00\u5c42\u9690\u85cf\u5c42\uff0c\u4f46\u5b9e\u9645\u4e2d\u4e5f\u6709\u591a\u5c42\u9690\u85cf\u5c42\u7684\uff0c\u5373\u8f93\u5165\u5c42\u548c\u8f93\u51fa\u5c42\u4e2d\u95f4\u5939\u7740\u6570\u5c42\u9690\u85cf\u5c42\uff0c\u5c42\u548c\u5c42\u4e4b\u95f4\u662f\u5168\u8fde\u63a5\u7684\u7ed3\u6784\uff0c\u540c\u4e00\u5c42\u7684\u795e\u7ecf\u5143\u4e4b\u95f4\u6ca1\u6709\u8fde\u63a5\u3002 <\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764808_830.jpg""> <\/p>\n
\u00a0<\/p>\n
<h2>2 \u5377\u79ef\u795e\u7ecf\u7f51\u7edc\u4e4b\u5c42\u7ea7\u7ed3\u6784 <\/h2><\/p>\n
cs231n\u8bfe\u7a0b\u91cc\u7ed9\u51fa\u4e86\u5377\u79ef\u795e\u7ecf\u7f51\u7edc\u5404\u4e2a\u5c42\u7ea7\u7ed3\u6784\uff0c\u5982\u4e0b\u56fe <\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516770378_513.jpg""> <\/p>\n
\u4e0a\u56fe\u4e2dCNN\u8981\u505a\u7684\u4e8b\u60c5\u662f\uff1a\u7ed9\u5b9a\u4e00\u5f20\u56fe\u7247\uff0c\u662f\u8f66\u8fd8\u662f\u9a6c\u672a\u77e5\uff0c\u662f\u4ec0\u4e48\u8f66\u4e5f\u672a\u77e5\uff0c\u73b0\u5728\u9700\u8981\u6a21\u578b\u5224\u65ad\u8fd9\u5f20\u56fe\u7247\u91cc\u5177\u4f53\u662f\u4e00\u4e2a\u4ec0\u4e48\u4e1c\u897f\uff0c\u603b\u4e4b\u8f93\u51fa\u4e00\u4e2a\u7ed3\u679c\uff1a\u5982\u679c\u662f\u8f66 \u90a3\u662f\u4ec0\u4e48\u8f66 \u6240\u4ee5 \u6700\u5de6\u8fb9\u662f\u6570\u636e\u8f93\u5165\u5c42\uff0c\u5bf9\u6570\u636e\u505a\u4e00\u4e9b\u5904\u7406\uff0c\u6bd4\u5982\u53bb\u5747\u503c\uff08\u628a\u8f93\u5165\u6570\u636e\u5404\u4e2a\u7ef4\u5ea6\u90fd\u4e2d\u5fc3\u5316\u4e3a0\uff0c\u907f\u514d\u6570\u636e\u8fc7\u591a\u504f\u5dee\uff0c\u5f71\u54cd\u8bad\u7ec3\u6548\u679c\uff09\u3001\u5f52\u4e00\u5316\uff08\u628a\u6240\u6709\u7684\u6570\u636e\u90fd\u5f52\u4e00\u5230\u540c\u6837\u7684\u8303\u56f4\uff09\u3001PCA\/\u767d\u5316\u7b49\u7b49\u3002CNN\u53ea\u5bf9\u8bad\u7ec3\u96c6\u505a\u201c\u53bb\u5747\u503c\u201d\u8fd9\u4e00\u6b65\u3002 \u4e2d\u95f4\u662f CONV\uff1a\u5377\u79ef\u8ba1\u7b97\u5c42\uff0c\u7ebf\u6027\u4e58\u79ef \u6c42\u548c\u3002 RELU\uff1a\u6fc0\u52b1\u5c42\uff0c\u4e0a\u65872.2\u8282\u4e2d\u6709\u63d0\u5230\uff1aReLU\u662f\u6fc0\u6d3b\u51fd\u6570\u7684\u4e00\u79cd\u3002 POOL\uff1a\u6c60\u5316\u5c42\uff0c\u7b80\u8a00\u4e4b\uff0c\u5373\u53d6\u533a\u57df\u5e73\u5747\u6216\u6700\u5927\u3002 \u6700\u53f3\u8fb9\u662f FC\uff1a\u5168\u8fde\u63a5\u5c42 \u8fd9\u51e0\u4e2a\u90e8\u5206\u4e2d\uff0c\u5377\u79ef\u8ba1\u7b97\u5c42\u662fCNN\u7684\u6838\u5fc3\uff0c\u4e0b\u6587\u5c06\u91cd\u70b9\u9610\u8ff0\u3002<\/p>\n
<h2>3 CNN\u4e4b\u5377\u79ef\u8ba1\u7b97\u5c42 <\/h2><\/p>\n
<h3>3.1 CNN\u600e\u4e48\u8fdb\u884c\u8bc6\u522b <\/h3><\/p>\n
\u5f53\u6211\u4eec\u7ed9\u5b9a\u4e00\u4e2a""X""\u7684\u56fe\u6848\uff0c\u8ba1\u7b97\u673a\u600e\u4e48\u8bc6\u522b\u8fd9\u4e2a\u56fe\u6848\u5c31\u662f\u201cX\u201d\u5462\uff1f\u4e00\u4e2a\u53ef\u80fd\u7684\u529e\u6cd5\u5c31\u662f\u8ba1\u7b97\u673a\u5b58\u50a8\u4e00\u5f20\u6807\u51c6\u7684\u201cX\u201d\u56fe\u6848\uff0c\u7136\u540e\u628a\u9700\u8981\u8bc6\u522b\u7684\u672a\u77e5\u56fe\u6848\u8ddf\u6807\u51c6""X""\u56fe\u6848\u8fdb\u884c\u6bd4\u5bf9\uff0c\u5982\u679c\u4e8c\u8005\u4e00\u81f4\uff0c\u5219\u5224\u5b9a\u672a\u77e5\u56fe\u6848\u5373\u662f\u4e00\u4e2a""X""\u56fe\u6848\u3002 \u800c\u4e14\u5373\u4fbf\u672a\u77e5\u56fe\u6848\u53ef\u80fd\u6709\u4e00\u4e9b\u5e73\u79fb\u6216\u7a0d\u7a0d\u53d8\u5f62\uff0c\u4f9d\u7136\u80fd\u8fa8\u522b\u51fa\u5b83\u662f\u4e00\u4e2aX\u56fe\u6848\u3002\u5982\u6b64\uff0cCNN\u662f\u628a\u672a\u77e5\u56fe\u6848\u548c\u6807\u51c6X\u56fe\u6848\u4e00\u4e2a\u5c40\u90e8\u4e00\u4e2a\u5c40\u90e8\u7684\u5bf9\u6bd4\uff0c\u5982\u4e0b\u56fe\u6240\u793a [\u56fe\u6765\u81ea\u53c2\u8003\u6587\u684825] <\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764841_515.png""> <\/p>\n
\u800c\u672a\u77e5\u56fe\u6848\u7684\u5c40\u90e8\u548c\u6807\u51c6X\u56fe\u6848\u7684\u5c40\u90e8\u4e00\u4e2a\u4e00\u4e2a\u6bd4\u5bf9\u65f6\u7684\u8ba1\u7b97\u8fc7\u7a0b\uff0c\u4fbf\u662f\u5377\u79ef\u64cd\u4f5c\u3002\u5377\u79ef\u8ba1\u7b97\u7ed3\u679c\u4e3a1\u8868\u793a\u5339\u914d\uff0c\u5426\u5219\u4e0d\u5339\u914d\u3002 \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u6765\u4e86\u89e3\u4e0b\u4ec0\u4e48\u662f\u5377\u79ef\u64cd\u4f5c\u3002<\/p>\n
<h3> 3.2 \u4ec0\u4e48\u662f\u5377\u79ef <\/h3><\/p>\n
\u5bf9\u56fe\u50cf\uff08\u4e0d\u540c\u7684\u6570\u636e\u7a97\u53e3\u6570\u636e\uff09\u548c\u6ee4\u6ce2\u77e9\u9635\uff08\u4e00\u7ec4\u56fa\u5b9a\u7684\u6743\u91cd\uff1a\u56e0\u4e3a\u6bcf\u4e2a\u795e\u7ecf\u5143\u7684\u591a\u4e2a\u6743\u91cd\u56fa\u5b9a\uff0c\u6240\u4ee5\u53c8\u53ef\u4ee5\u770b\u505a\u4e00\u4e2a\u6052\u5b9a\u7684\u6ee4\u6ce2\u5668filter\uff09\u505a\u5185\u79ef\uff08\u9010\u4e2a\u5143\u7d20\u76f8\u4e58\u518d\u6c42\u548c\uff09\u7684\u64cd\u4f5c\u5c31\u662f\u6240\u8c13\u7684\u300e\u5377\u79ef\u300f\u64cd\u4f5c\uff0c\u4e5f\u662f\u5377\u79ef\u795e\u7ecf\u7f51\u7edc\u7684\u540d\u5b57\u6765\u6e90\u3002 \u975e\u4e25\u683c\u610f\u4e49\u4e0a\u6765\u8bb2\uff0c\u4e0b\u56fe\u4e2d\u7ea2\u6846\u6846\u8d77\u6765\u7684\u90e8\u5206\u4fbf\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u4e2a\u6ee4\u6ce2\u5668\uff0c\u5373\u5e26\u7740\u4e00\u7ec4\u56fa\u5b9a\u6743\u91cd\u7684\u795e\u7ecf\u5143\u3002\u591a\u4e2a\u6ee4\u6ce2\u5668\u53e0\u52a0\u4fbf\u6210\u4e86\u5377\u79ef\u5c42\u3002<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764868_951.png""> <\/p>\n
OK\uff0c\u4e3e\u4e2a\u5177\u4f53\u7684\u4f8b\u5b50\u3002\u6bd4\u5982\u4e0b\u56fe\u4e2d\uff0c\u56fe\u4e2d\u5de6\u8fb9\u90e8\u5206\u662f\u539f\u59cb\u8f93\u5165\u6570\u636e\uff0c\u56fe\u4e2d\u4e2d\u95f4\u90e8\u5206\u662f\u6ee4\u6ce2\u5668filter\uff0c\u56fe\u4e2d\u53f3\u8fb9\u662f\u8f93\u51fa\u7684\u65b0\u7684\u4e8c\u7ef4\u6570\u636e\u3002<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764882_762.png""> <\/p>\n
\u5206\u89e3\u4e0b\u4e0a\u56fe<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764898_144.png""> <\/p>\n
\u5bf9\u5e94\u4f4d\u7f6e\u4e0a\u662f\u6570\u5b57\u5148\u76f8\u4e58\u540e\u76f8\u52a0<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764912_847.png""> <\/p>\n
= \u4e2d\u95f4\u6ee4\u6ce2\u5668filter\u4e0e\u6570\u636e\u7a97\u53e3\u505a\u5185\u79ef\uff0c\u5176\u5177\u4f53\u8ba1\u7b97\u8fc7\u7a0b\u5219\u662f\uff1a4<em>0 + 0<\/em>0 + 0<em>0 + 0<\/em>0 + 0<em>1 + 0<\/em>1 + 0<em>0 + 0<\/em>1 + -4*2 = -8 *<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/julyedu-img-public.oss-cn-beijing.aliyuncs.com\/Public\/Image\/Question\/1516764936_540.png""> <\/p>\n
\u00a0<\/p>\n
<h3>3.3 \u56fe\u50cf\u4e0a\u7684\u5377\u79ef <\/h3><\/p>\n
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<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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