“`” \u53c2\u8003\u56de\u7b54\uff1a<\/p>\n
SVM\u6838\u51fd\u6570\uff1a<\/p>\n
1 \u6838\u51fd\u6570\u672c\u8d28<\/p>\n
\u6838\u51fd\u6570\u7684\u672c\u8d28\u53ef\u4ee5\u6982\u62ec\u4e3a\u5982\u4e0b\u4e09\u70b9\uff1a<\/p>\n
1\uff09\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5e38\u5e38\u9047\u5230\u7ebf\u6027\u4e0d\u53ef\u5206\u7684\u60c5\u51b5\u3002\u9488\u5bf9\u8fd9\u79cd\u60c5\u51b5\uff0c\u5e38\u7528\u505a\u6cd5\u662f\u628a\u6837\u4f8b\u7279\u5f81\u6620\u5c04\u5230\u9ad8\u7ef4\u7a7a\u95f4\u4e2d\uff0c\u8f6c\u5316\u4e3a\u7ebf\u6027\u53ef\u5206\u95ee\u9898\u3002<\/p>\n
2\uff09\u5c06\u6837\u4f8b\u7279\u5f81\u6620\u5c04\u5230\u9ad8\u7ef4\u7a7a\u95f4\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u7ef4\u5ea6\u8fc7\u9ad8\u7684\u95ee\u9898\u3002<\/p>\n
3\uff09\u9488\u5bf9\u53ef\u80fd\u7684\u7ef4\u707e\u96be\uff0c\u53ef\u4ee5\u5229\u7528\u6838\u51fd\u6570\u3002\u6838\u51fd\u6570\u4e5f\u662f\u5c06\u7279\u5f81\u4ece\u4f4e\u7ef4\u5230\u9ad8\u7ef4\u7684\u8f6c\u6362\uff0c\u4f46\u907f\u514d\u4e86\u76f4\u63a5\u8fdb\u884c\u9ad8\u7ef4\u7a7a\u95f4\u4e2d\u7684\u590d\u6742\u8ba1\u7b97\uff0c\u53ef\u4ee5\u5728\u4f4e\u7ef4\u4e0a\u8fdb\u884c\u8ba1\u7b97\uff0c\u5374\u80fd\u5728\u5b9e\u8d28\u4e0a\u5c06\u5206\u7c7b\u6548\u679c\u8868\u73b0\u5728\u9ad8\u7ef4\u4e0a\u3002<\/p>\n
\u5f53\u7136\uff0cSVM\u4e5f\u80fd\u5904\u7406\u7ebf\u6027\u53ef\u5206\u95ee\u9898\uff0c\u8fd9\u65f6\u4f7f\u7528\u7684\u5c31\u662f\u7ebf\u6027\u6838\u4e86\u3002<\/p>\n
\u5e38\u7528\u7684\u6838\u51fd\u6570\u5305\u62ec\u5982\u4e0b\u51e0\u4e2a\uff1a\u7ebf\u6027\u6838\u51fd\u6570\uff0c\u591a\u9879\u5f0f\u6838\u51fd\u6570\uff0cRBF\u6838\u51fd\u6570(\u9ad8\u65af\u6838)\uff0cSigmoid\u6838\u51fd\u6570<\/p>\n
2 \u7ebf\u6027\u6838<\/p>\n
2.1 \u7ebf\u6027\u6838<\/p>\n
SVM\u80af\u5b9a\u662f\u53ef\u4ee5\u5904\u7406\u7ebf\u6027\u95ee\u9898\u7684\uff0c\u8fd9\u4e2a\u5c31\u662f\u65af\u5766\u798f\u8bfe\u7a0b\u91cc\u8bb2SVM\u65f6\u5019\uff0c\u6700\u5f00\u59cb\u8bb2\u89e3\u7684\u90e8\u5206\uff0c\u4ee5\u7ebf\u6027\u95ee\u9898\u5165\u624b\u8fdb\u884c\u8bb2\u89e3\u3002<\/p>\n
\u7ebf\u6027\u6838\u8ba1\u7b97\u4e3ak(x1,x2)=\uff0c\u5176\u5b9e\u5c31\u662f\u5728\u539f\u59cb\u7a7a\u95f4\u4e2d\u7684\u5185\u79ef\u3002<\/p>\n
2.2 \u7ebf\u6027SVM\u548c\u903b\u8f91\u56de\u5f52<\/p>\n
\u5f53SVM\u4f7f\u7528\u7ebf\u6027\u6838\u65f6\uff0c\u5728\u5904\u7406\u5206\u7c7b\u95ee\u9898\u65f6\uff0c\u548c\u903b\u8f91\u56de\u5f52\u6bd4\u8f83\u6709\u54ea\u4e9b\u5f02\u540c\uff0c\u5982\u4f55\u9009\u62e9\uff1f<\/p>\n
1\uff09\u7ebf\u6027\u6838SVM\u548c\u903b\u8f91\u56de\u5f52\u672c\u8d28\u4e0a\u6ca1\u6709\u533a\u522b<\/p>\n
2\uff09n=\u7279\u5f81\u6570\uff0cm=\u8bad\u7ec3\u6837\u672c\u6570\u76ee<\/p>\n
\u5982\u679cn\u76f8\u5bf9m\u6bd4\u8f83\u5927\uff0c\u4f7f\u7528\u903b\u8f91\u56de\u5f52\u6216\u8005\u7ebf\u6027SVM\uff0c\u4f8b\u5982n=10000\uff0cm=10-1000<\/p>\n
\u5982\u679cn\u6bd4\u8f83\u5c0f\uff0cm\u6570\u503c\u9002\u4e2d\uff0c\u4f7f\u7528\u9ad8\u65af\u6838\u7684SVM\uff0c\u4f8b\u5982n=1-1000,m=10-10000<\/p>\n
\u5982\u679cn\u6bd4\u8f83\u5c0f\uff0cm\u5f88\u5927\uff0c\u6784\u5efa\u66f4\u591a\u7279\u5f81\uff0c\u7136\u540e\u4f7f\u7528\u903b\u8f91\u56de\u5f52\u6216\u8005\u7ebf\u6027SVM<\/p>\n
3 \u975e\u7ebf\u6027\u6838<\/p>\n
\u5e38\u7528\u7684\u975e\u7ebf\u6027\u6838\u5305\u62ec\u591a\u9879\u5f0f\u6838\uff0cRBF\u6838\uff08\u9ad8\u65af\u6838\uff09\uff0csigmoid\u6838\u3002<\/p>\n
RBF\u6838\u901a\u5e38\u662f\u9996\u9009\uff0c\u5b9e\u8df5\u4e2d\u5f80\u5f80\u80fd\u8868\u73b0\u51fa\u826f\u597d\u7684\u6027\u80fd\u3002\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190315\/311436_1552627851763_F616533D5B04DDB7D7B15192990F8374""><\/p>\n
\u5176\u4e2d\uff0c\u5982\u679c\u03c3\u9009\u5f97\u5f88\u5927\u7684\u8bdd\uff0c\u9ad8\u6b21\u7279\u5f81\u4e0a\u7684\u6743\u91cd\u5b9e\u9645\u4e0a\u8870\u51cf\u5f97\u975e\u5e38\u5feb\uff0c\u6240\u4ee5\u5b9e\u9645\u4e0a\uff08\u6570\u503c\u4e0a\u8fd1\u4f3c\u4e00\u4e0b\uff09\u76f8\u5f53\u4e8e\u4e00\u4e2a\u4f4e\u7ef4\u7684\u5b50\u7a7a\u95f4\uff1b\u53cd\u8fc7\u6765\uff0c\u5982\u679c\u03c3\u9009\u5f97\u5f88\u5c0f\uff0c\u5219\u53ef\u4ee5\u5c06\u4efb\u610f\u7684\u6570\u636e\u6620\u5c04\u4e3a\u7ebf\u6027\u53ef\u5206\u2014\u2014\u5f53\u7136\uff0c\u8fd9\u5e76\u4e0d\u4e00\u5b9a\u662f\u597d\u4e8b\uff0c\u56e0\u4e3a\u968f\u4e4b\u800c\u6765\u7684\u53ef\u80fd\u662f\u975e\u5e38\u4e25\u91cd\u7684\u8fc7\u62df\u5408\u95ee\u9898\u3002\u4e0d\u8fc7\uff0c\u603b\u7684\u6765\u8bf4\uff0c\u901a\u8fc7\u8c03\u63a7\u53c2\u6570\uff0c\u9ad8\u65af\u6838\u5b9e\u9645\u4e0a\u5177\u6709\u76f8\u5f53\u9ad8\u7684\u7075\u6d3b\u6027\uff0c\u4e5f\u662f\u4f7f\u7528\u6700\u5e7f\u6cdb\u7684\u6838\u51fd\u6570\u4e4b\u4e00\u3002<\/p>\n
\u591a\u9879\u5f0f\u6838\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190315\/311436_1552627881133_7BB9D520F71DCFD398E4AA9CD3407F7D""><\/p>\n
sigmoid\u6838\u51fd\u6570\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190315\/311436_1552627909278_948E6CCA17A9D6B5BFF1DA3D49844077""><\/p>\n
\u91c7\u7528Sigmoid\u51fd\u6570\u4f5c\u4e3a\u6838\u51fd\u6570\u65f6\uff0c\u652f\u6301\u5411\u91cf\u673a\u5b9e\u73b0\u7684\u5c31\u662f\u4e00\u79cd\u591a\u5c42\u611f\u77e5\u5668\u795e\u7ecf\u7f51\u7edc\uff0c\u5e94\u7528SVM\u65b9\u6cd5\uff0c\u9690\u542b\u5c42\u8282\u70b9\u6570\u76ee(\u5b83\u786e\u5b9a\u795e\u7ecf\u7f51\u7edc\u7684\u7ed3\u6784)\u3001\u9690\u542b\u5c42\u8282\u70b9\u5bf9\u8f93\u5165\u8282\u70b9\u7684\u6743\u503c\u90fd\u662f\u5728\u8bbe\u8ba1(\u8bad\u7ec3)\u7684\u8fc7\u7a0b\u4e2d\u81ea\u52a8\u786e\u5b9a\u7684\u3002\u800c\u4e14\u652f\u6301\u5411\u91cf\u673a\u7684\u7406\u8bba\u57fa\u7840\u51b3\u5b9a\u4e86\u5b83\u6700\u7ec8\u6c42\u5f97\u7684\u662f\u5168\u5c40\u6700\u4f18\u503c\u800c\u4e0d\u662f\u5c40\u90e8\u6700\u5c0f\u503c\uff0c\u4e5f\u4fdd\u8bc1\u4e86\u5b83\u5bf9\u4e8e\u672a\u77e5\u6837\u672c\u7684\u826f\u597d\u6cdb\u5316\u80fd\u529b\u800c\u4e0d\u4f1a\u51fa\u73b0\u8fc7\u5b66\u4e60\u73b0\u8c61\u3002<\/p>\n
4 \u5982\u4f55\u9009\u62e9<\/p>\n
1\uff09\u53ef\u4ee5\u5229\u7528\u4e13\u5bb6\u5148\u9a8c\u77e5\u8bc6\u4f59\u5f26\u9009\u5b9a\u6838\u51fd\u6570\uff0c\u4f8b\u5982\u5df2\u7ecf\u77e5\u9053\u95ee\u9898\u662f\u7ebf\u6027\u53ef\u5206\u7684\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u7ebf\u6027\u6838\uff0c\u4e0d\u5fc5\u9009\u7528\u975e\u7ebf\u6027\u6838<\/p>\n
2\uff09\u5229\u7528\u4ea4\u53c9\u9a8c\u8bc1\uff0c\u8bd5\u7528\u4e0d\u540c\u7684\u6838\u51fd\u6570\uff0c\u8bef\u5dee\u6700\u5c0f\u7684\u5373\u4e3a\u6548\u679c\u6700\u597d\u7684\u6838\u51fd\u6570<\/p>\n
3\uff09\u6df7\u5408\u6838\u51fd\u6570\u65b9\u6cd5\uff0c\u5c06\u4e0d\u540c\u7684\u6838\u51fd\u6570\u7ed3\u5408\u8d77\u6765<\/p>\n
\u6211\u89c9\u5f97\u95ee\u9898\u662f\u7ebf\u6027\u53ef\u5206\u548c\u7ebf\u6027\u4e0d\u53ef\u5206\u5176\u4e2d\u4e4b\u4e00\uff0c\u90a3\u5728\u9009\u62e9\u6838\u51fd\u6570\u7684\u65f6\u5019\uff0c\u5982\u679c\u4e0d\u6e05\u695a\u95ee\u9898\u5c5e\u4e8e\u54ea\u4e00\u7c7b\uff0c\u5c31\u4e24\u7c7b\u6838\u90fd\u5c1d\u8bd5\u4e00\u4e0b\uff0c\u6240\u4ee5\u53ef\u4ee5\u4e3b\u8981\u5c1d\u8bd5\u7ebf\u6027\u6838\u4ee5\u53caRBF\u6838\u3002<\/p>\n
1\uff09 Linear\u6838\uff1a\u4e3b\u8981\u7528\u4e8e\u7ebf\u6027\u53ef\u5206\u7684\u60c5\u5f62\u3002\u53c2\u6570\u5c11\uff0c\u901f\u5ea6\u5feb\uff0c\u5bf9\u4e8e\u4e00\u822c\u6570\u636e\uff0c\u5206\u7c7b\u6548\u679c\u5df2\u7ecf\u5f88\u7406\u60f3\u4e86\u3002<\/p>\n
2\uff09RBF\u6838\uff1a\u4e3b\u8981\u7528\u4e8e\u7ebf\u6027\u4e0d\u53ef\u5206\u7684\u60c5\u5f62\u3002\u53c2\u6570\u591a\uff0c\u5206\u7c7b\u7ed3\u679c\u975e\u5e38\u4f9d\u8d56\u4e8e\u53c2\u6570\u3002\u6709\u5f88\u591a\u4eba\u662f\u901a\u8fc7\u8bad\u7ec3\u6570\u636e\u7684\u4ea4\u53c9\u9a8c\u8bc1\u6765\u5bfb\u627e\u5408\u9002\u7684\u53c2\u6570\uff0c\u4e0d\u8fc7\u8fd9\u4e2a\u8fc7\u7a0b\u6bd4\u8f83\u8017\u65f6\u3002<\/p>\n
\u81f3\u4e8e\u5230\u5e95\u8be5\u91c7\u7528\u54ea\u79cd\u6838\uff0c\u8981\u6839\u636e\u5177\u4f53\u95ee\u9898\uff0c\u6709\u7684\u6570\u636e\u662f\u7ebf\u6027\u53ef\u5206\u7684\uff0c\u6709\u7684\u4e0d\u53ef\u5206\uff0c\u9700\u8981\u591a\u5c1d\u8bd5\u4e0d\u540c\u6838\u4e0d\u540c\u53c2\u6570\u3002\u5982\u679c\u7279\u5f81\u7684\u63d0\u53d6\u7684\u597d\uff0c\u5305\u542b\u7684\u4fe1\u606f\u91cf\u8db3\u591f\u5927\uff0c\u5f88\u591a\u95ee\u9898\u90fd\u662f\u7ebf\u6027\u53ef\u5206\u7684\u3002\u5f53\u7136\uff0c\u5982\u679c\u6709\u8db3\u591f\u7684\u65f6\u95f4\u53bb\u5bfb\u627eRBF\u6838\u53c2\u6570\uff0c\u5e94\u8be5\u80fd\u8fbe\u5230\u66f4\u597d\u7684\u6548\u679c\u3002<\/p>\n
\u6ca1\u6709\u4e00\u79cd\u9ec4\u91d1\u89c4\u5219\u53ef\u4ee5\u786e\u5b9a\u54ea\u79cd\u6838\u51fd\u6570\u5c06\u63a8\u5bfc\u51fa\u6700\u51c6\u786e\u7684SVM\uff0c\u5728\u5b9e\u8df5\u4e2d\uff0c\u6838\u51fd\u6570\u7684\u9009\u62e9\u4e00\u822c\u5e76\u4e0d\u5bfc\u81f4\u51c6\u786e\u7387\u7684\u5f88\u5927\u5dee\u522b\u3002SVM\u603b\u662f\u53d1\u73b0\u5168\u5c40\u89e3\uff0c\u800c\u4e0d\u662f\u5c40\u90e8\u89e3\u3002<\/p>\n
5 \u5176\u4ed6<\/p>\n
SVM\u7684\u590d\u6742\u5ea6\u4e3b\u8981\u7531\u652f\u6301\u5411\u91cf\u6570\u523b\u753b\uff0c\u800c\u4e0d\u662f\u6570\u636e\u7684\u7ef4\u5ea6\uff0c\u56e0\u6b64\u76f8\u6bd4\u5176\u4ed6\u65b9\u6cd5\uff0cSVM\u4e0d\u592a\u5bb9\u6613\u8fc7\u62df\u5408\u3002<\/p>\n
SVM\u7684\u635f\u5931\u51fd\u6570\uff1a<\/p>\n
1\u3001Hinge\u635f\u5931\u51fd\u6570<\/p>\n
\u9996\u5148\u6211\u4eec\u6765\u770b\u4ec0\u4e48\u662f\u5408\u9875\u635f\u5931\u51fd\u6570\uff08hinge loss function\uff09\uff1a<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190315\/311436_1552627977636_23F58DFE507EBF294F6744DFF6FA5F97""><\/p>\n
hinge loss function<\/p>\n
\u4e0b\u6807\u201d+\u201d\u8868\u793a\u4ee5\u4e0b\u53d6\u6b63\u503c\u7684\u51fd\u6570\uff0c\u6211\u4eec\u7528z\u8868\u793a\u4e2d\u62ec\u53f7\u4e2d\u7684\u90e8\u5206\uff1a<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190315\/311436_1552627960637_56487D7EE55D123BC95C7EA3BF165A97""><\/p>\n
\u4e5f\u5c31\u662f\u8bf4\uff0c\u6570\u636e\u70b9\u5982\u679c\u88ab\u6b63\u786e\u5206\u7c7b\uff0c\u635f\u5931\u4e3a0\uff0c\u5982\u679c\u6ca1\u6709\u88ab\u6b63\u786e\u5206\u7c7b\uff0c\u635f\u5931\u4e3az\u3002\u5408\u9875\u635f\u5931\u51fd\u6570\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190315\/311436_1552627991042_D00D1C7AD0BB4157F322B1C27021FF2C""><\/p>\n
2\u3001SVM\u635f\u5931\u51fd\u6570<\/p>\n
SVM\u7684\u635f\u5931\u51fd\u6570\u5c31\u662f\u5408\u9875\u635f\u5931\u51fd\u6570\u52a0\u4e0a\u6b63\u5219\u5316\u9879\uff1a<\/p>\n
\u00a0<\/p>\n
2\u3001SVM\u635f\u5931\u51fd\u6570<\/p>\n
SVM\u7684\u635f\u5931\u51fd\u6570\u5c31\u662f\u5408\u9875\u635f\u5931\u51fd\u6570\u52a0\u4e0a\u6b63\u5219\u5316\u9879\uff1a<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190315\/311436_1552628049041_E97F977CF363620D9944FCD1001BCA6B""><\/p>\n
\u635f\u5931\u51fd\u6570<\/p>\n
\u00a0<\/p>\n
\u00a0<\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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