{"id":232,"date":"2015-07-21T14:13:01","date_gmt":"2015-07-21T14:13:01","guid":{"rendered":"http:\/\/blog.chen-hongyi.com\/?p=232"},"modified":"2015-07-22T09:31:32","modified_gmt":"2015-07-22T09:31:32","slug":"232","status":"publish","type":"post","link":"https:\/\/chen-hongyi.com\/?p=232","title":{"rendered":"\u8f6c \u51b3\u7b56\u6811"},"content":{"rendered":"<p>From: http:\/\/blog.csdn.net\/heiyeshuwu\/article\/details\/46991273<\/p>\n<p>[\u539f]\u3010\u539f\u521b\u3011\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u4e4b\uff1a\u51b3\u7b56\u6811<br \/>\nPosted: July 21st, 2015, 8:12pm CEST<\/p>\n<p>\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u4e4b\uff1a\u51b3\u7b56\u6811<\/p>\n<p>\u4f5c\u8005\uff1ajmz (360\u7535\u5546\u6280\u672f)<\/p>\n<p>1 \u6982\u89c8<br \/>\n\u51b3\u7b56\u6811\u5b66\u4e60\u662f\u4e00\u79cd\u903c\u8fd1\u79bb\u6563\u503c\u76ee\u6807\u51fd\u6570\u7684\u65b9\u6cd5\uff0c\u5728\u8fd9\u79cd\u65b9\u6cd5\u4e2d\u5b66\u4e60\u5230\u7684\u51fd\u6570\u88ab\u8868\u793a\u4e3a\u4e00\u68f5\u51b3\u7b56\u6811\uff1a<\/p>\n<p>1) \u5b66\u4e60\u6790\u53d6\u8868\u8fbe\u5f0f\uff0c\u80fd\u518d\u88ab\u8868\u793a\u4e3a\u591a\u4e2aif-then\u7684\u89c4\u5219\uff0c\u4ee5\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002<\/p>\n<p>2) \u5bf9\u566a\u58f0\u6570\u636e\u6709\u5f88\u597d\u7684\u9002\u5e94\u6027\u3002&#8211;\u7edf\u8ba1\u7279\u6027<\/p>\n<p>3) \u51b3\u7b56\u6811\u5b66\u4e60\u65b9\u6cd5\u641c\u7d22\u5b8c\u6574\u8868\u793a\u7684\u5047\u8bbe\u7a7a\u95f4(\u4e00\u4e2a\u6709\u6548\u7684\u89c2\u70b9\u662f\u673a\u5668\u5b66\u4e60\u95ee\u9898\u7ecf\u5e38\u5f52\u7ed3\u4e8e\u641c\u7d22\u95ee\u9898\uff0c\u5373\u5bf9\u975e\u5e38\u5927\u7684\u5047\u8bbe\u7a7a\u95f4\u8fdb\u884c\u641c\u7d22\u3001\u5df2\u786e\u5b9a\u6700\u4f73\u62df\u5408\u5230\u89c2\u5bdf\u5230\u7684\u6570\u636e)\uff0c\u4ece\u800c\u907f\u514d\u4e86\u53d7\u9650\u5047\u8bbe\u7a7a\u95f4\u7684\u4e0d\u8db3\u3002\u51b3\u7b56\u6811\u5b66\u4e60\u7684\u5f52\u7eb3\u504f\u7f6e(\u6709\u5174\u8da3\u53c2\u8003\u201c\u5f52\u7eb3\u504f\u7f6e\u201d\uff0c\u201c\u5965\u574e\u59c6\u5243\u5200\u95ee\u9898\u201d\u76f8\u5173\u95ee\u9898\u66f4\u8be6\u7ec6\u7684\u63cf\u8ff0)\u662f\u4f18\u5148\u9009\u62e9\u8f83\u5c0f\u7684\u6811\u3002<\/p>\n<p>2 \u51b3\u7b56\u6811\u8868\u793a<br \/>\n\u51b3\u7b56\u6811\u901a\u8fc7\u628a\u5b9e\u4f8b\u4ece\u6839\u7ed3\u70b9\u6392\u5217(\u5982\u4f55\u9009\u62e9\u6392\u5217\u6b21\u5e8f\u662f\u51b3\u7b56\u6811\u7b97\u6cd5\u7684\u6838\u5fc3)\u5230\u67d0\u4e2a\u53f6\u5b50\u7ed3\u70b9\u6765\u5206\u7c7b\u5b9e\u4f8b\uff0c\u53f6\u5b50\u7ed3\u70b9\u5373\u4e3a\u5b9e\u4f8b\u6240\u5c5e\u7684\u5206\u7c7b\u3002\u6811\u4e0a\u7684\u6bcf\u4e00\u4e2a\u7ed3\u70b9\u6307\u5b9a\u4e86\u5bf9\u5b9e\u4f8b\u7684\u67d0\u4e2a\u5c5e\u6027\u7684\u6d4b\u8bd5\uff0c\u5e76\u4e14\u8be5\u7ed3\u70b9\u7684\u6bcf\u4e00\u4e2a\u540e\u7ee7\u5206\u652f\u5bf9\u5e94\u4e8e\u8be5\u5c5e\u6027\u7684\u4e00\u4e2a\u53ef\u80fd\u503c\u3002<\/p>\n<p>\u5982\uff0c\u4e00\u9897\u6839\u636e\u5929\u6c14\u60c5\u51b5\u5224\u65ad\u662f\u5426\u53c2\u52a0\u6253\u7f51\u7403\u7684\u51b3\u7b56\u6811\u5982\u4e0b\uff1a<\/p>\n<p><a href=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/0.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/0-300x223.jpg\" alt=\"0\" width=\"300\" height=\"223\" class=\"aligncenter size-medium wp-image-236\" srcset=\"https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/0-300x223.jpg 300w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/0-402x300.jpg 402w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/0.jpg 596w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>\u4f8b\u5982,\u4e0b\u9762\u7684\u5b9e\u4f8b:<Outlook=Sunny,Temperature=Hot,Humidity=High,Wind=Strong>\u5c06\u88ab\u6cbf\u7740\u8fd9\u68f5\u51b3\u7b56\u6811\u7684\u6700\u5de6\u5206\u652f\u5411\u4e0b\u6392\u5217,\u56e0\u800c\u88ab\u8bc4\u5b9a\u4e3a\u53cd\u4f8b(\u4e5f\u5c31\u662f\u8fd9\u68f5\u6811\u9884\u6d4bPlayTennis=No) \u3002<\/p>\n<p>\u901a\u5e38\u51b3\u7b56\u6811\u4ee3\u8868\u5b9e\u4f8b\u5c5e\u6027\u503c\u7ea6\u675f\u7684\u5408\u53d6(conjunction)\u7684\u6790\u53d6\u5f0f(disjunction)\u3002\u4ece\u6811\u6839\u5230\u6811\u53f6\u7684\u6bcf\u4e00\u6761\u8def\u5f84\u5bf9\u5e94\u4e00\u7ec4\u5c5e\u6027\u6d4b\u8bd5\u7684\u5408\u53d6,\u6811\u672c\u8eab\u5bf9\u5e94\u8fd9\u4e9b\u5408\u53d6\u7684\u6790\u53d6\uff0c\u8be5\u51b3\u7b56\u6811\u5bf9\u5e94\u4e8e\u4ee5\u4e0b\u8868\u8fbe\u5f0f\uff1a<\/p>\n<p>(Outlook=Sunny \u0668Humidity=Normal)<\/p>\n<p>\u0667(Outlook=Overcast)<\/p>\n<p>\u0667(Outlook=Rain\u0668 Wind=Weak)<\/p>\n<p>3 \u9002\u7528\u573a\u666f<br \/>\n\u4e0d\u540c\u7684\u51b3\u7b56\u6811\u5b66\u4e60\u7b97\u6cd5\u53ef\u80fd\u6709\u8fd9\u6837\u6216\u90a3\u6837\u7684\u4e0d\u592a\u4e00\u81f4\u7684\u80fd\u529b\u548c\u8981\u6c42\uff0c\u4f46\u6839\u636e\u4ee5\u4e0a\u5206\u6790\u63cf\u8ff0\u4e0d\u96be\u770b\u51fa\u3001\u51b3\u7b56\u6811\u5b66\u4e60\u6700\u9002\u5408\u5177\u6709\u4ee5\u4e0b\u7279\u5f81\u7684\u95ee\u9898\uff1a<\/p>\n<p>1) \u5b9e\u4f8b\u662f\u7531\u201c\u5c5e\u6027-\u503c\u201d\u5bf9(pair)\u8868\u793a\u7684\u3002\u6700\u7b80\u5355\u7684\u51b3\u7b56\u6811\u5b66\u4e60\u4e2d,\u6bcf\u4e00\u4e2a\u5c5e\u6027\u53d6\u5c11\u6570\u7684\u5206\u79bb\u7684\u503c(\u4f8b\u5982,Hot\u3001Mild\u3001Cold)\u3002<\/p>\n<p>2) \u76ee\u6807\u51fd\u6570\u5177\u6709\u79bb\u6563\u7684\u8f93\u51fa\u503c\u3002<\/p>\n<p>3) \u53ef\u80fd\u9700\u8981\u6790\u53d6\u7684\u63cf\u8ff0\uff0c\u5982\u4e0a\u9762\u6307\u51fa\u7684\uff0c\u51b3\u7b56\u6811\u5f88\u81ea\u7136\u5730\u4ee3\u8868\u4e86\u6790\u53d6\u8868\u8fbe\u5f0f\u3002<\/p>\n<p>4) \u8bad\u7ec3\u6570\u636e\u53ef\u4ee5\u5305\u542b\u9519\u8bef\u3002\u51b3\u7b56\u6811\u5b66\u4e60\u5bf9\u9519\u8bef\u6709\u5f88\u597d\u7684\u9002\u5e94\u6027\uff0c\u65e0\u8bba\u662f\u8bad\u7ec3\u6837\u4f8b\u6240\u5c5e\u7684\u5206\u7c7b\u9519\u8bef\u8fd8\u662f\u63cf\u8ff0\u8fd9\u4e9b\u6837\u4f8b\u7684\u5c5e\u6027\u503c\u9519\u8bef\u3002<\/p>\n<p>5) \u8bad\u7ec3\u6570\u636e\u53ef\u4ee5\u5305\u542b\u7f3a\u5c11\u5c5e\u6027\u503c\u7684\u5b9e\u4f8b\u3002<\/p>\n<p>\u5df2\u7ecf\u53d1\u73b0\u5f88\u591a\u5b9e\u9645\u7684\u95ee\u9898\u7b26\u5408\u8fd9\u4e9b\u7279\u5f81,\u6240\u4ee5\u51b3\u7b56\u6811\u5b66\u4e60\u5df2\u7ecf\u88ab\u5e94\u7528\u5230\u5f88\u591a\u95ee\u9898\u4e2d\u3002\u4f8b\u5982\u6839\u636e\u75be\u75c5\u5206\u7c7b\u60a3\u8005;\u6839\u636e\u8d77\u56e0\u5206\u7c7b\u8bbe\u5907\u6545\u969c;\u6839\u636e\u62d6\u6b20\u652f\u4ed8\u7684\u53ef\u80fd\u6027\u5206\u7c7b\u8d37\u6b3e\u7533\u8bf7\u3002\u5bf9\u4e8e\u8fd9\u4e9b\u95ee\u9898,\u6838\u5fc3\u4efb\u52a1\u90fd\u662f\u8981\u628a\u6837\u4f8b\u5206\u7c7b\u5230\u5404\u53ef\u80fd\u7684\u79bb\u6563\u503c\u5bf9\u5e94\u7684\u7c7b\u522b\u4e2d\uff0c\u56e0\u6b64\u7ecf\u5e38\u88ab\u79f0\u4e3a\u5206\u7c7b\u95ee\u9898<\/p>\n<p>4 \u57fa\u672c\u7684\u51b3\u7b56\u6811\u5b66\u4e60\u7b97\u6cd5<br \/>\n\u5927\u591a\u6570\u51b3\u7b56\u6811\u5b66\u4e60\u7b97\u6cd5\u662f\u4e00\u79cd\u6838\u5fc3\u7b97\u6cd5\u7684\u53d8\u4f53\u3001\u8be5\u7b97\u6cd5\u91c7\u7528\u81ea\u9876\u5411\u4e0b\u7684\u8d2a\u5a6a\u641c\u7d22\u904d\u5386\u53ef\u80fd\u7684\u51b3\u7b56\u6811\u7a7a\u95f4\u3002\u51b3\u7b56\u6811\u6784\u9020\u8fc7\u7a0b\u662f\u4ece\u201c\u54ea\u4e00\u4e2a\u5c5e\u6027\u5c06\u5728\u6811\u7684\u6839\u7ed3\u70b9\u88ab\u6d4b\u8bd5\uff1f\u201d\u8fd9\u4e2a\u95ee\u9898\u5f00\u59cb\u7684\u3002<\/p>\n<p>1) \u4f7f\u7528\u7edf\u8ba1\u6d4b\u8bd5\u6765\u786e\u5b9a\u6bcf\u5206\u7c7b\u80fd\u529b\u6700\u597d\u7684\u5c5e\u6027\u88ab\u9009\u4f5c\u6811\u7684\u6839\u7ed3\u70b9\u7684\u6d4b\u8bd5\u3002<\/p>\n<p>2) \u4e3a\u6839\u7ed3\u70b9\u5c5e\u6027\u7684\u6bcf\u4e2a\u53ef\u80fd\u503c\u4ea7\u751f\u4e00\u4e2a\u5206\u652f,\u5e76\u628a\u8bad\u7ec3\u6837\u4f8b\u6392\u5217\u5230\u9002\u5f53\u7684\u5206\u652f(\u4e5f\u5c31\u662f,\u6837\u4f8b\u7684\u8be5\u5c5e\u6027\u503c\u5bf9\u5e94\u7684\u5206\u652f)\u4e4b\u4e0b\u3002<\/p>\n<p>3) \u91cd\u590d\u6574\u4e2a\u8fc7\u7a0b,\u7528\u6bcf\u4e2a\u5206\u652f\u7ed3\u70b9\u5173\u8054\u7684\u8bad\u7ec3\u6837\u4f8b\u6765\u9009\u53d6\u5728\u8be5\u70b9\u88ab\u6d4b\u8bd5\u7684\u6700\u4f73\u5c5e\u6027\u3002<\/p>\n<p>\u8fd9\u5f62\u6210\u4e86\u5bf9\u51b3\u7b56\u6811\u7684\u8d2a\u5a6a\u641c\u7d22\uff0c\u4e5f\u5c31\u662f\u7b97\u6cd5\u4ece\u4e0d\u56de\u6eaf\u91cd\u65b0\u8003\u8651\u4ee5\u524d\u7684\u9009\u62e9\u3002\u4e0b\u56fe\u63cf\u8ff0\u4e86\u8be5\u7b97\u6cd5\u7684\u4e00\u4e2a\u7b80\u5316\u7248\u672c\uff1a<\/p>\n<p><a href=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/1.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/1-300x240.jpg\" alt=\"1\" width=\"300\" height=\"240\" class=\"aligncenter size-medium wp-image-237\" srcset=\"https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/1-300x240.jpg 300w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/1-374x300.jpg 374w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/1.jpg 571w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>1. \u54ea\u4e2a\u5c5e\u6027\u662f\u6700\u4f73\u7684\u5206\u7c7b\u5c5e\u6027?<br \/>\nID3 \u7b97\u6cd5\u7684\u6838\u5fc3\u95ee\u9898\u662f\u9009\u53d6\u5728\u6811\u7684\u6bcf\u4e2a\u7ed3\u70b9\u8981\u6d4b\u8bd5\u7684\u5c5e\u6027\uff0c\u6211\u4eec\u5e0c\u671b\u9009\u62e9\u7684\u662f\u6700\u6709\u52a9\u4e8e\u5206\u7c7b\u5b9e\u4f8b\u7684\u5c5e\u6027\u3002<\/p>\n<p>1) \u7528\u71b5\u5ea6\u91cf\u6837\u4f8b\u7684\u7eaf\u5ea6<\/p>\n<p>\u4e3a\u4e86\u7cbe\u786e\u5730\u5b9a\u4e49\u4fe1\u606f\u589e\u76ca,\u6211\u4eec\u5148\u5b9a\u4e49\u4fe1\u606f\u8bba\u4e2d\u5e7f\u6cdb\u4f7f\u7528\u7684\u4e00\u4e2a\u5ea6\u91cf\u6807\u51c6,\u79f0\u4e3a\u71b5(entropy),\u5b83\u523b\u753b\u4e86\u4efb\u610f\u6837\u4f8b\u96c6\u7684\u7eaf\u5ea6(purity)\u3002\u7ed9\u5b9a\u5305\u542b\u5173\u4e8e\u67d0\u4e2a\u76ee\u6807\u6982\u5ff5\u7684\u6b63\u53cd\u6837\u4f8b\u7684\u6837\u4f8b\u96c6S,\u90a3\u4e48S \u76f8\u5bf9\u8fd9\u4e2a\u5e03\u5c14\u578b\u5206\u7c7b\u7684\u71b5\u4e3a\uff1a<\/p>\n<p>Entropy(S) =  -p\u2295log2p\u2295 -p\u0398log2p\u0398<\/p>\n<p>\u5176\u4e2dp\u2295\u662f\u5728S \u4e2d\u6b63\u4f8b\u7684\u6bd4\u4f8b,p\u0398\u662f\u5728S \u4e2d\u8d1f\u4f8b\u7684\u6bd4\u4f8b\u3002\u5728\u6709\u5173\u71b5\u7684\u6240\u6709\u8ba1\u7b97\u4e2d\u6211\u4eec\u5b9a\u4e490log0 \u4e3a0\u3002<\/p>\n<p>\u4e3e\u4f8b\u8bf4\u660e,\u5047\u8bbeS \u662f\u4e00\u4e2a\u5173\u4e8e\u67d0\u5e03\u5c14\u6982\u5ff5\u7684\u670914 \u4e2a\u6837\u4f8b\u7684\u96c6\u5408,\u5b83\u5305\u62ec9 \u4e2a\u6b63\u4f8b\u548c5 \u4e2a\u53cd\u4f8b(\u6211\u4eec\u91c7\u7528\u8bb0\u53f7[9+,5-]\u6765\u6982\u62ec\u8fd9\u6837\u7684\u6570\u636e\u6837\u4f8b)\u3002\u90a3\u4e48S \u76f8\u5bf9\u4e8e\u8fd9\u4e2a\u5e03\u5c14\u5206\u7c7b\u7684\u71b5(Entropy)\u4e3a:<\/p>\n<p>Entropy ([9+, 5\u2212]) = \u2212(9 \/ 14) log 2 (9 \/14) \u2212 (5 \/ 14) log 2(5 \/ 14) =0.940<\/p>\n<p>\u6ce8\u610f,\u5982\u679cS \u7684\u6240\u6709\u6210\u5458\u5c5e\u4e8e\u540c\u4e00\u7c7b,\u90a3\u4e48S \u7684\u71b5\u4e3a0\u3002\u4f8b\u5982,\u5982\u679c\u6240\u6709\u7684\u6210\u5458\u662f\u6b63\u7684 ( p\u2295=1 ) , \u90a3\u4e48 p\u0398 \u5c31\u662f 0 , \u4e8e\u662f Entropy(S) =\u2212 1 \u22c5 log ( 1 ) \u2212 (0) \u22c5log (0) = \u22121 \u22c5 0 \u2212 0 \u22c5 log 0 = 0 \u3002<\/p>\n<p>\u53e6\u5916,\u5f53\u96c6\u5408\u4e2d\u6b63\u53cd\u6837\u4f8b\u7684\u6570\u91cf\u76f8\u7b49\u65f6\u71b5\u4e3a1\u3002\u5982\u679c\u96c6\u5408\u4e2d\u6b63\u53cd\u4f8b\u7684\u6570\u91cf\u4e0d\u7b49\u65f6,\u71b5\u4ecb\u4e8e0 \u548c1 \u4e4b\u95f4\u3002\u4e0b\u56fe\u663e\u793a\u4e86\u5173\u4e8e\u67d0\u5e03\u5c14\u5206\u7c7b\u7684\u71b5\u51fd\u6570\u968f\u7740p\u2295\u4ece0 \u52301 \u53d8\u5316\u7684\u66f2\u7ebf\u3002<br \/>\n<a href=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/2.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/2-300x263.jpg\" alt=\"2\" width=\"300\" height=\"263\" class=\"aligncenter size-medium wp-image-239\" srcset=\"https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/2-300x263.jpg 300w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/2-341x300.jpg 341w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/2.jpg 447w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>\u4fe1\u606f\u8bba\u4e2d\u71b5\u7684\u4e00\u79cd\u89e3\u91ca\u662f,\u71b5\u786e\u5b9a\u4e86\u8981\u7f16\u7801\u96c6\u5408S \u4e2d\u4efb\u610f\u6210\u5458(\u5373\u4ee5\u5747\u5300\u7684\u6982\u7387\u968f\u673a\u62bd\u51fa\u7684\u4e00\u4e2a\u6210\u5458)\u7684\u5206\u7c7b\u6240\u9700\u8981\u7684\u6700\u5c11\u4e8c\u8fdb\u5236\u4f4d\u6570\u3002\u4e3e\u4f8b\u6765\u8bf4,\u5982\u679cp \u2295 \u662f1,\u63a5\u6536\u8005\u77e5\u9053\u62bd\u51fa\u7684\u6837\u4f8b\u5fc5\u4e3a\u6b63,\u6240\u4ee5\u4e0d\u5fc5\u53d1\u4efb\u4f55\u6d88\u606f,\u6b64\u65f6\u7684\u71b5\u4e3a0\u3002\u53e6\u4e00\u65b9\u9762,\u5982\u679c\u662fp\u22950.5,\u5fc5\u987b\u7528\u4e00\u4e2a\u4e8c\u8fdb\u5236\u4f4d\u6765\u8bf4\u660e\u62bd\u51fa\u7684\u6837\u4f8b\u662f\u6b63\u8fd8\u662f\u8d1f\u3002\u5982\u679cp\u2295 \u662f0.8,\u90a3\u4e48\u5bf9\u6240\u9700\u7684\u6d88\u606f\u7f16\u7801\u65b9\u6cd5\u662f\u8d4b\u7ed9\u6b63\u4f8b\u96c6\u5408\u8f83\u77ed\u7684\u7f16\u7801,\u53ef\u80fd\u6027\u8f83\u5c0f\u7684\u53cd\u4f8b\u96c6\u5408\u8f83\u957f\u7684\u7f16\u7801,\u5e73\u5747\u6bcf\u6761\u6d88\u606f\u7684\u7f16\u7801\u5c11\u4e8e1 \u4e2a\u4e8c\u8fdb\u5236\u4f4d\u3002<\/p>\n<p>\u66f4\u4e00\u822c\u7684,\u5982\u679c\u76ee\u6807\u5c5e\u6027\u5177\u6709c\u4e2a\u4e0d\u540c\u7684\u503c,\u90a3\u4e48S \u76f8\u5bf9\u4e8ec \u4e2a\u72b6\u6001(c-wise)\u7684\u5206\u7c7b\u7684\u71b5\u5b9a\u4e49\u4e3a:<\/p>\n<p><a href=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/3.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/3.jpg\" alt=\"3\" width=\"293\" height=\"92\" class=\"aligncenter size-full wp-image-240\" \/><\/a><\/p>\n<p>2) \u7528\u4fe1\u606f\u589e\u76ca\u5ea6\u91cf\u671f\u671b\u7684\u71b5\u964d\u4f4e<br \/>\n<a href=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/4.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/4-300x61.jpg\" alt=\"4\" width=\"300\" height=\"61\" class=\"aligncenter size-medium wp-image-241\" srcset=\"https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/4-300x61.jpg 300w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/4.jpg 441w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>\u5df2\u7ecf\u6709\u4e86\u71b5\u4f5c\u4e3a\u8861\u91cf\u8bad\u7ec3\u6837\u4f8b\u96c6\u5408\u7eaf\u5ea6\u7684\u6807\u51c6,\u73b0\u5728\u53ef\u4ee5\u5b9a\u4e49\u5c5e\u6027\u5206\u7c7b\u8bad\u7ec3\u6570\u636e\u7684\u6548\u529b\u7684\u5ea6\u91cf\u6807\u51c6\u3002\u8fd9\u4e2a\u6807\u51c6\u88ab\u79f0\u4e3a\u201c\u4fe1\u606f\u589e\u76ca\u201d\u3002\u7b80\u5355\u7684\u8bf4,\u4e00\u4e2a\u5c5e\u6027\u7684\u4fe1\u606f\u589e\u76ca\u5c31\u662f\u7531\u4e8e\u4f7f\u7528\u8fd9\u4e2a\u5c5e\u6027\u5206\u5272\u6837\u4f8b\u800c\u5bfc\u81f4\u7684\u671f\u671b\u71b5\u964d\u4f4e\u3002<\/p>\n<p>\u5176\u4e2dValues(A)\u662f\u5c5e\u6027A \u6240\u6709\u53ef\u80fd\u503c\u7684\u96c6\u5408\u3002<\/p>\n<p>Sv\u662fS \u4e2d\u5c5e\u6027A \u7684\u503c\u4e3av \u7684\u5b50\u96c6(\u4e5f\u5c31\u662f,S v ={s\u2208S|A(s)=v})\u3002<\/p>\n<p>\u8bf7\u6ce8\u610f,\u7b49\u5f0f\u7684\u7b2c\u4e00\u9879\u5c31\u662f\u539f\u6765\u96c6\u5408S \u7684\u71b5\uff0c\u7b2c\u4e8c\u9879\u662f\u7528A \u5206\u7c7bS \u540e\u71b5\u7684\u671f\u671b\u503c\u3002\u8fd9\u4e2a\u7b2c\u4e8c\u9879\u63cf\u8ff0\u7684\u671f\u671b\u71b5\u5c31\u662f\u6bcf\u4e2a\u5b50\u96c6\u7684\u71b5\u7684\u52a0\u6743\u548c\u3002|Sv |\u6743\u503c\u4e3a\u5c5e\u4e8eSv \u7684\u6837\u4f8b\u5360\u539f\u59cb\u6837\u4f8bS \u7684\u6bd4\u4f8b\u3002\u6240\u4ee5Gain(S,A)\u662f\u7531\u4e8e\u77e5\u9053\u5c5e\u6027A\u7684|S |\u503c\u800c\u5bfc\u81f4\u7684\u671f\u671b\u71b5\u51cf\u5c11\u3002<\/p>\n<p>\u6362\u53e5\u8bdd\u6765\u8bb2,Gain(S,A)\u662f\u7531\u4e8e\u7ed9\u5b9a\u5c5e\u6027A \u7684\u503c\u800c\u5f97\u5230\u7684\u5173\u4e8e\u76ee\u6807\u51fd\u6570\u503c\u7684\u4fe1\u606f\u3002\u5f53\u5bf9S \u7684\u4e00\u4e2a\u4efb\u610f\u6210\u5458\u7684\u76ee\u6807\u503c\u7f16\u7801\u65f6,Gain(S,A)\u7684\u503c\u662f\u5728\u77e5\u9053\u5c5e\u6027A \u7684\u503c\u540e\u53ef\u4ee5\u8282\u7701\u7684\u4e8c\u8fdb\u5236\u4f4d\u6570\u3002<\/p>\n<p>\u4fe1\u606f\u589e\u76ca\u6b63\u662fID3 \u7b97\u6cd5\u589e\u957f\u6811\u7684\u6bcf\u4e00\u6b65\u4e2d\u9009\u53d6\u6700\u4f73\u5c5e\u6027\u7684\u5ea6\u91cf\u6807\u51c6\u3002\u4e0b\u56fe\u6982\u8ff0\u4e86\u5982\u4f55\u4f7f\u7528\u4fe1\u606f\u589e\u76ca\u6765\u8bc4\u4f30\u5c5e\u6027\u7684\u5206\u7c7b\u80fd\u529b\u3002\u5728\u8fd9\u4e2a\u56fe\u4e2d,\u8ba1\u7b97\u4e86\u4e24\u4e2a\u4e0d\u540c\u5c5e\u6027:\u6e7f\u5ea6(Humidity)\u548c\u98ce\u529b(Wind)\u7684\u4fe1\u606f\u589e\u76ca\uff1a<\/p>\n<p><a href=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/5.png\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/5-300x126.png\" alt=\"5\" width=\"300\" height=\"126\" class=\"aligncenter size-medium wp-image-242\" srcset=\"https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/5-300x126.png 300w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/5-500x211.png 500w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/5.png 898w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>2. \u7b97\u6cd5\u793a\u4f8b<br \/>\n\u4e3a\u4e86\u6f14\u793aID3 \u7b97\u6cd5\u7684\u5177\u4f53\u64cd\u4f5c\uff0c\u8bad\u7ec3\u6837\u4f8b\u5165\u4e0b\u56fe\u3002\u8fd9\u91cc,\u76ee\u6807\u5c5e\u6027PlayTennis \u5bf9\u4e8e\u4e0d\u540c\u7684\u661f\u671f\u516d\u4e0a\u5348\u5177\u6709yes \u548cno\u4e24\u4e2a\u503c,\u6211\u4eec\u5c06\u6839\u636e\u5176\u4ed6\u5c5e\u6027\u6765\u9884\u6d4b\u8fd9\u4e2a\u76ee\u6807\u5c5e\u6027\u503c\u3002<\/p>\n<p>\u5148\u8003\u8651\u8fd9\u4e2a\u7b97\u6cd5\u7684\u7b2c\u4e00\u6b65,\u521b\u5efa\u51b3\u7b56\u6811\u7684\u6700\u9876\u7aef\u7ed3\u70b9\u3002\u54ea\u4e00\u4e2a\u5c5e\u6027\u8be5\u5728\u6811\u4e0a\u7b2c\u4e00\u4e2a\u88ab\u6d4b\u8bd5\u5462?ID3\u7b97\u6cd5\u8ba1\u7b97\u6bcf\u4e00\u4e2a\u5019\u9009\u5c5e\u6027(\u4e5f\u5c31\u662fOutlook,Temperature,Humidity,\u548cWind)\u7684\u4fe1\u606f\u589e\u76ca,\u7136\u540e\u9009\u62e9\u4fe1\u606f\u589e\u76ca\u6700\u9ad8\u7684\u4e00\u4e2a\u3002\u6240\u6709\u56db\u4e2a\u5c5e\u6027\u7684\u4fe1\u606f\u589e\u76ca\u4e3a\uff1a<\/p>\n<p>Gain(S,Outlook)=0.246<\/p>\n<p>Gain(S,Humidity)=0.151<\/p>\n<p>Gain(S,Wind)=0.048<\/p>\n<p>Gain(S,Temperature)=0.029<\/p>\n<p>\u5176\u4e2dS \u8868\u793a\u6765\u81ea\u4e0b\u56fe\u7684\u8bad\u7ec3\u6837\u4f8b\u7684\u96c6\u5408\u3002<\/p>\n<p><a href=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/6.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/6-300x254.jpg\" alt=\"6\" width=\"300\" height=\"254\" class=\"aligncenter size-medium wp-image-243\" srcset=\"https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/6-300x254.jpg 300w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/6-353x300.jpg 353w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/6.jpg 603w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>\u6839\u636e\u4fe1\u606f\u589e\u76ca\u6807\u51c6,\u5c5e\u6027Outlook \u5728\u8bad\u7ec3\u6837\u4f8b\u4e0a\u63d0\u4f9b\u4e86\u5bf9\u76ee\u6807\u5c5e\u6027PlayTennis \u7684\u6700\u597d\u9884\u6d4b\u3002\u6240\u4ee5,Outlook \u88ab\u9009\u4f5c\u6839\u7ed3\u70b9\u7684\u51b3\u7b56\u5c5e\u6027,\u5e76\u4e3a\u5b83\u7684\u6bcf\u4e00\u4e2a\u53ef\u80fd\u503c(\u4e5f\u5c31\u662fSunny,Overcast \u548cRain)\u5728\u6839\u7ed3\u70b9\u4e0b\u521b\u5efa\u5206\u652f\u3002<\/p>\n<p>\u540c\u65f6\u753b\u51fa\u7684\u8fd8\u6709\u88ab\u6392\u5217\u5230\u6bcf\u4e2a\u65b0\u7684\u540e\u7ee7\u7ed3\u70b9\u7684\u8bad\u7ec3\u6837\u4f8b\u3002\u6ce8\u610f\u5230\u6bcf\u4e00\u4e2aOutlook=Overcast \u7684\u6837\u4f8b\u4e5f\u90fd\u662fPlayTennis \u7684\u6b63\u4f8b\u3002\u6240\u4ee5,\u6811\u7684\u8fd9\u4e2a\u7ed3\u70b9\u6210\u4e3a\u4e00\u4e2a\u53f6\u5b50\u7ed3\u70b9,\u5b83\u5bf9\u76ee\u6807\u5c5e\u6027\u7684\u5206\u7c7b\u662fPlayTennis=Yes\u3002\u76f8\u53cd,\u5bf9\u5e94Outlook=Sunny \u548cOutlook=Rain \u7684\u540e\u7ee7\u7ed3\u70b9\u8fd8\u6709\u975e0\u7684\u71b5,\u6240\u4ee5\u51b3\u7b56\u6811\u4f1a\u5728\u8fd9\u4e9b\u7ed3\u70b9\u4e0b\u8fdb\u4e00\u6b65\u5c55\u5f00\u3002<\/p>\n<p>\u5bf9\u4e8e\u975e\u7ec8\u7aef\u7684\u540e\u7ee7\u7ed3\u70b9,\u518d\u91cd\u590d\u524d\u9762\u7684\u8fc7\u7a0b\u9009\u62e9\u4e00\u4e2a\u65b0\u7684\u5c5e\u6027\u6765\u5206\u5272\u8bad\u7ec3\u6837\u4f8b,\u8fd9\u4e00\u6b21\u4ec5\u4f7f\u7528\u4e0e\u8fd9\u4e2a\u7ed3\u70b9\u5173\u8054\u7684\u8bad\u7ec3\u6837\u4f8b\u3002\u5df2\u7ecf\u88ab\u6536\u7f16\u5165\u6811\u7684\u8f83\u9ad8\u7ed3\u70b9\u7684\u5c5e\u6027\u88ab\u6392\u9664\u5728\u5916,\u4ee5\u4fbf\u4efb\u4f55\u7ed9\u5b9a\u7684\u5c5e\u6027\u5728\u6811\u7684\u4efb\u610f\u8def\u5f84\u4e0a\u6700\u591a\u4ec5\u51fa\u73b0\u4e00\u6b21\u3002\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u65b0\u7684\u53f6\u5b50\u7ed3\u70b9\u7ee7\u7eed\u8fd9\u4e2a\u8fc7\u7a0b,\u76f4\u5230\u6ee1\u8db3\u4ee5\u4e0b\u4e24\u4e2a\u6761\u4ef6\u4e2d\u7684\u4efb\u4e00\u4e2a:<\/p>\n<p>1) \u6240\u6709\u7684\u5c5e\u6027\u5df2\u7ecf\u88ab\u8fd9\u6761\u8def\u5f84\u5305\u62ec<\/p>\n<p>2) \u4e0e\u8fd9\u4e2a\u7ed3\u70b9\u5173\u8054\u7684\u6240\u6709\u8bad\u7ec3\u6837\u4f8b\u90fd\u5177\u6709\u540c\u6837\u7684\u76ee\u6807\u5c5e\u6027\u503c(\u4e5f\u5c31\u662f\u5b83\u4eec\u7684\u71b5\u4e3a0)<\/p>\n<p>\u4e0b\u56fe\u6f14\u793a\u4e86\u7b97\u6cd5\u7684\u6c42\u89e3\u8fc7\u7a0b\uff1a<\/p>\n<p><a href=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/7.png\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/7-300x196.png\" alt=\"7\" width=\"300\" height=\"196\" class=\"aligncenter size-medium wp-image-244\" srcset=\"https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/7-300x196.png 300w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/7-456x300.png 456w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/7.png 891w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>5 \u7528\u641c\u7d22\u7684\u89c2\u70b9\u770b\u51b3\u7b56\u6811\u5b66\u4e60<br \/>\n\u4e0e\u5176\u4ed6\u7684\u5f52\u7eb3\u5b66\u4e60\u7b97\u6cd5\u4e00\u6837,ID3\u7b97\u6cd5\u53ef\u4ee5\u88ab\u63cf\u8ff0\u4e3a\u4ece\u4e00\u4e2a\u5047\u8bbe\u7a7a\u95f4\u4e2d\u641c\u7d22\u4e00\u4e2a\u62df\u5408\u8bad\u7ec3\u6837\u4f8b\u7684\u5047\u8bbe\u3002\u88abID3 \u7b97\u6cd5\u641c\u7d22\u7684\u5047\u8bbe\u7a7a\u95f4\u5c31\u662f\u53ef\u80fd\u7684\u51b3\u7b56\u6811\u7684\u96c6\u5408\u3002ID3\u7b97\u6cd5\u4ee5\u4e00\u79cd\u4ece\u7b80\u5355\u5230\u590d\u6742\u7684\u722c\u5c71\u7b97\u6cd5\u904d\u5386\u8fd9\u4e2a\u5047\u8bbe\u7a7a\u95f4\u3002\u4ece\u7a7a\u7684\u6811\u5f00\u59cb,\u7136\u540e\u9010\u6b65\u8003\u8651\u66f4\u52a0\u590d\u6742\u7684\u5047\u8bbe,\u76ee\u7684\u662f\u641c\u7d22\u5230\u4e00\u4e2a\u6b63\u786e\u5206\u7c7b\u8bad\u7ec3\u6570\u636e\u7684\u51b3\u7b56\u6811\u3002\u5f15\u5bfc\u8fd9\u79cd\u722c\u5c71\u641c\u7d22\u7684\u8bc4\u4f30\u51fd\u6570\u662f\u4fe1\u606f\u589e\u76ca\u5ea6\u91cf\u3002\u4e0b\u56fe\u63cf\u8ff0\u4e86\u8fd9\u79cd\u641c\u7d22\uff1a<\/p>\n<p><a href=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/9.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/blog.chen-hongyi.com\/wp-content\/uploads\/2015\/07\/9-284x300.jpg\" alt=\"9\" width=\"284\" height=\"300\" class=\"aligncenter size-medium wp-image-245\" srcset=\"https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/9-284x300.jpg 284w, https:\/\/chen-hongyi.com\/wp-content\/uploads\/2015\/07\/9.jpg 422w\" sizes=\"auto, (max-width: 284px) 100vw, 284px\" \/><\/a><\/p>\n<p>\u53ef\u4ee5\u901a\u8fc7ID3\u7b97\u6cd5\u7684\u641c\u7d22\u7a7a\u95f4\u548c\u641c\u7d22\u7b56\u7565\u6df1\u5165\u8ba4\u8bc6\u8fd9\u4e2a\u7b97\u6cd5\u7684\u4f18\u52bf\u548c\u4e0d\u8db3\u3002<\/p>\n<p>1) ID3\u7b97\u6cd5\u4e2d\u7684\u5047\u8bbe\u7a7a\u95f4\u5305\u542b\u6240\u6709\u7684\u51b3\u7b56\u6811\uff0c \u907f\u514d\u4e86\u641c\u7d22\u4e0d\u5b8c\u6574\u5047\u8bbe\u7a7a\u95f4(\u8bf4\u660e\u4e00\u4e0b\uff1a\u6709\u4e9b\u7b97\u6cd5\u662f\u641c\u7d22\u4e0d\u5b8c\u6574\u5047\u8bbe\u7a7a\u95f4\u7684\u3001\u5177\u4f53\u53c2\u8003<<\u673a\u5668\u5b66\u4e60>>\u8fd9\u672c\u4e66)\u7684\u4e00\u4e2a\u4e3b\u8981\u98ce\u9669\uff1a\u5047\u8bbe\u7a7a\u95f4\u53ef\u80fd\u4e0d\u5305\u542b\u76ee\u6807\u51fd\u6570\u3002<\/p>\n<p>2) \u5f53\u904d\u5386\u51b3\u7b56\u6811\u7a7a\u95f4\u65f6,ID3\u4ec5\u7ef4\u62a4\u5355\u4e00\u7684\u5f53\u524d\u5047\u8bbe\u3002\u56e0\u4e3a\u4ec5\u8003\u8651\u5355\u4e00\u7684\u5047\u8bbe,ID3\u7b97\u6cd5\u5931\u53bb\u4e86\u8868\u793a\u6240\u6709\u4e00\u81f4\u5047\u8bbe\u6240\u5e26\u6765\u7684\u4f18\u52bf\u3002(\u8bf4\u660e\u4e00\u4e0b\uff1a\u610f\u601d\u5c31\u662f\u8bf4\u5b83\u4e0d\u80fd\u5224\u65ad\u6709\u6ca1\u6709\u5176\u4ed6\u7684\u51b3\u7b56\u6811\u4e5f\u662f\u4e0e\u73b0\u6709\u7684\u8bad\u7ec3\u6570\u636e\u4e00\u81f4\u7684\uff0c\u6216\u8005\u4f7f\u7528\u65b0\u7684\u5b9e\u4f8b\u67e5\u8be2\u6765\u6700\u4f18\u5730\u533a\u5206\u8fd9\u4e9b\u7ade\u4e89\u5047\u8bbe)<\/p>\n<p>3) \u5728\u641c\u7d22\u4e2d\u4e0d\u8fdb\u884c\u56de\u6eaf\u3002\u6bcf\u5f53\u5728\u6811\u7684\u67d0\u4e00\u5c42\u6b21\u9009\u62e9\u4e86\u4e00\u4e2a\u5c5e\u6027\u8fdb\u884c\u6d4b\u8bd5,\u5b83\u4e0d\u4f1a\u518d\u56de\u6eaf\u91cd\u65b0\u8003\u8651\u8fd9\u4e2a\u9009\u62e9\u3002\u6240\u4ee5,\u5b83\u6613\u53d7\u65e0\u56de\u6eaf\u7684\u722c\u5c71\u641c\u7d22\u4e2d\u5e38\u89c1\u98ce\u9669\u5f71\u54cd:\u6536\u655b\u5230\u5c40\u90e8\u6700\u4f18\u7684\u7b54\u6848,\u4f46\u4e0d\u662f\u5168\u5c40\u6700\u4f18\u7684\u3002<\/p>\n<p>4) \u641c\u7d22\u7684\u6bcf\u4e00\u6b65\u90fd\u4f7f\u7528\u5f53\u524d\u7684\u6240\u6709\u8bad\u7ec3\u6837\u4f8b,\u4ee5\u7edf\u8ba1\u4e3a\u57fa\u7840\u51b3\u5b9a\u600e\u6837\u7cbe\u5316\u5f53\u524d\u7684\u5047\u8bbe\u3002\u8fd9\u4e0e\u90a3\u4e9b\u57fa\u4e8e\u5355\u72ec\u7684\u8bad\u7ec3\u6837\u4f8b\u9012\u589e\u4f5c\u51fa\u51b3\u5b9a\u7684\u65b9\u6cd5\u4e0d\u540c\u3002\u4f7f\u7528\u6240\u6709\u6837\u4f8b\u7684\u7edf\u8ba1\u5c5e\u6027(\u4f8b\u5982,\u4fe1\u606f\u589e\u76ca)\u7684\u4e00\u4e2a\u4f18\u70b9\u662f\u5927\u5927\u51cf\u5c0f\u4e86\u5bf9\u4e2a\u522b\u8bad\u7ec3\u6837\u4f8b\u9519\u8bef\u7684\u654f\u611f\u6027\u3002<\/p>\n<p>6 \u51b3\u7b56\u6811\u5b66\u4e60\u7684\u5f52\u7eb3\u504f\u7f6e(\u53c2\u89c1\u5f52\u7eb3\u504f\u7f6e\u76f8\u5173\u8bba\u8ff0)<br \/>\n1\u4ece\u89c2\u6d4b\u5230\u7684\u8bad\u7ec3\u6570\u636e\u6cdb\u5316\u4ee5\u5206\u7c7b\u672a\u89c1\u5b9e\u4f8b\u7684\u7b56\u7565\u662f\u4ec0\u4e48\u5462\uff1f<br \/>\n\u6362\u53e5\u8bdd\u8bf4,\u5b83\u7684\u5f52\u7eb3\u504f\u7f6e\u662f\u4ec0\u4e48\uff1f<\/p>\n<p>\u5982\u679c\u7ed9\u5b9a\u4e00\u4e2a\u8bad\u7ec3\u6837\u4f8b\u7684\u96c6\u5408,\u90a3\u4e48\u901a\u5e38\u6709\u5f88\u591a\u51b3\u7b56\u6811\u4e0e\u8fd9\u4e9b\u6837\u4f8b\u4e00\u81f4\u3002\u6240\u4ee5,\u8981\u63cf\u8ff0ID3 \u7b97\u6cd5\u7684\u5f52\u7eb3\u504f\u7f6e,\u5e94\u627e\u5230\u5b83\u4ece\u6240\u6709\u4e00\u81f4\u7684\u5047\u8bbe\u4e2d\u9009\u62e9\u4e00\u4e2a\u7684\u6839\u636e\u3002ID3\u4ece\u8fd9\u4e9b\u51b3\u7b56\u6811\u4e2d\u9009\u62e9\u54ea\u4e00\u4e2a\u5462?\u5b83\u9009\u62e9\u5728\u4f7f\u7528\u7b80\u5355\u5230\u590d\u6742\u7684\u722c\u5c71\u7b97\u6cd5\u904d\u5386\u53ef\u80fd\u7684\u6811\u7a7a\u95f4\u65f6\u9047\u5230\u7684\u7b2c\u4e00\u4e2a\u53ef\u63a5\u53d7\u7684\u6811\u3002<\/p>\n<p>\u6982\u7565\u5730\u8bb2,ID3\u7684\u641c\u7d22\u7b56\u7565\u4e3a<\/p>\n<p>a) \u4f18\u5148\u9009\u62e9\u8f83\u77ed\u7684\u6811\u800c\u4e0d\u662f\u8f83\u957f\u7684<\/p>\n<p>b) \u9009\u62e9\u90a3\u4e9b\u4fe1\u606f\u589e\u76ca\u9ad8\u7684\u5c5e\u6027\u79bb\u6839\u7ed3\u70b9\u8f83\u8fd1\u7684\u6811\u3002<\/p>\n<p>\u5728ID3 \u4e2d\u4f7f\u7528\u7684\u9009\u62e9\u5c5e\u6027\u7684\u542f\u53d1\u5f0f\u89c4\u5219\u548c\u5b83\u9047\u5230\u7684\u7279\u5b9a\u8bad\u7ec3\u6837\u4f8b\u4e4b\u95f4\u5b58\u5728\u7740\u5fae\u5999\u7684\u76f8\u4e92\u4f5c\u7528,\u7531\u4e8e\u8fd9\u4e00\u70b9\u3002\u5f88\u96be\u51c6\u786e\u5730\u523b\u5212\u51faID3 \u7684\u5f52\u7eb3\u504f\u7f6e\u3002\u7136\u800c\u6211\u4eec\u53ef\u4ee5\u8fd1\u4f3c\u5730\u628a\u5b83\u7684\u5f52\u7eb3\u504f\u7f6e\u63cf\u8ff0\u4e3a\u4e00\u79cd\u5bf9\u77ed\u7684\u51b3\u7b56\u6811\u7684\u504f\u597d\u3002<\/p>\n<p>\u8fd1\u4f3c\u7684ID3 \u7b97\u6cd5\u5f52\u7eb3\u504f\u7f6e:\u8f83\u77ed\u7684\u6811\u6bd4\u8f83\u957f\u7684\u4f18\u5148<\/p>\n<p>\u4e8b\u5b9e\u4e0a,\u6211\u4eec\u53ef\u4ee5\u60f3\u8c61\u4e00\u4e2a\u7c7b\u4f3c\u4e8eID3\u7684\u7b97\u6cd5,\u5b83\u7cbe\u786e\u5730\u5177\u6709\u8fd9\u79cd\u5f52\u7eb3\u504f\u7f6e\u3002\u8003\u8651\u4e00\u79cd\u7b97\u6cd5,\u5b83\u4ece\u4e00\u4e2a\u7a7a\u7684\u6811\u5f00\u59cb\u5e7f\u5ea6\u4f18\u5148\u641c\u7d22\u9010\u6e10\u590d\u6742\u7684\u6811,\u5148\u8003\u8651\u6240\u6709\u6df1\u5ea6\u4e3a1 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\u4f7f\u7528\u4fe1\u606f\u589e\u76ca\u542f\u53d1\u5f0f\u89c4\u5219\u548c\u201c\u722c\u5c71\u201d\u7b56\u7565,\u5b83\u5305\u542b\u6bd4BFS-ID3\u66f4\u590d\u6742\u7684\u504f\u7f6e\u3002\u5c24\u5176\u662f,\u5b83\u5e76\u975e\u603b\u662f\u627e\u6700\u77ed\u7684\u4e00\u81f4\u6811,\u800c\u662f\u503e\u5411\u4e8e\u90a3\u4e9b\u4fe1\u606f\u589e\u76ca\u9ad8\u7684\u5c5e\u6027\u66f4\u9760\u8fd1\u6839\u7ed3\u70b9\u7684\u6811\u3002ID3 \u5f52\u7eb3\u504f\u7f6e\u7684\u66f4\u8d34\u5207\u8fd1\u4f3c:<\/p>\n<p>\u8f83\u77ed\u7684\u6811\u6bd4\u8f83\u957f\u7684\u5f97\u5230\u4f18\u5148\u3002\u90a3\u4e9b\u4fe1\u606f\u589e\u76ca\u9ad8\u7684\u5c5e\u6027\u66f4\u9760\u8fd1\u6839\u7ed3\u70b9\u7684\u6811\u5f97\u5230\u4f18\u5148\u3002<\/p>\n<p>2. \u4e3a\u4ec0\u4e48\u4f18\u5148\u77ed\u7684\u5047\u8bbe?<br 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\u5904\u7406\u4ee3\u4ef7\u4e0d\u540c\u7684\u5c5e\u6027<\/p>\n<p>\u5728\u67d0\u4e9b\u5b66\u4e60\u4efb\u52a1\u4e2d,\u5b9e\u4f8b\u7684\u5c5e\u6027\u53ef\u80fd\u4e0e\u4ee3\u4ef7\u76f8\u5173\u3002\u4f8b\u5982,\u5728\u5b66\u4e60\u5206\u7c7b\u75be\u75c5\u65f6\u6211\u4eec\u53ef\u80fd\u4ee5\u8fd9\u4e9b\u5c5e\u6027\u6765\u63cf\u8ff0\u60a3\u8005:\u4f53\u6e29\u3001\u6d3b\u7ec4\u7ec7\u5207\u7247\u68c0\u67e5\u3001\u8109\u640f\u3001\u8840\u6db2\u5316\u9a8c\u7ed3\u679c\u7b49\u3002\u8fd9\u4e9b\u5c5e\u6027\u5728\u4ee3\u4ef7\u65b9\u9762\u5dee\u522b\u975e\u5e38\u5927,\u4e0d\u8bba\u662f\u6240\u9700\u7684\u8d39\u7528\u8fd8\u662f\u60a3\u8005\u8981\u627f\u53d7\u7684\u4e0d\u9002\u3002\u5bf9\u4e8e\u8fd9\u6837\u7684\u4efb\u52a1,\u6211\u4eec\u5c06\u4f18\u5148\u9009\u62e9\u5c3d\u53ef\u80fd\u4f7f\u7528\u4f4e\u4ee3\u4ef7\u5c5e\u6027\u7684\u51b3\u7b56\u6811,\u4ec5\u5f53\u9700\u8981\u4ea7\u751f\u53ef\u9760\u7684\u5206\u7c7b\u65f6\u624d\u4f9d\u8d56\u9ad8\u4ee3\u4ef7\u5c5e\u6027\u3002\u8003\u8651\u4ee3\u4ef7\u7684\u76f8\u5173\u7b97\u6cd5\u53c2\u89c1\u53c2\u8003\u8d44\u6599\u3002<\/p>\n<p>\u53c2\u8003\u8d44\u6599\uff1a<\/p>\n<p>1<<\u673a\u5668\u5b66\u4e60>>   Tom M. Mitchell<\/p>\n<p>2<<CS229--Machine Learning>>  Andrew Ng<\/p>\n<p>\u8bfe\u7a0b\u7ffb\u8bd1\uff1a<\/p>\n<p>http:\/\/v.163.com\/special\/opencourse\/machinelearning.html<\/p>\n<p>\u8bb2\u4e49\u4e0b\u8f7d\uff1a<\/p>\n<p>http:\/\/openclassroom.stanford.edu\/MainFolder\/CoursePage.php?course=MachineLearning<\/p>\n<p><\u5b8c><\/p>\n<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<\/p>\n<p>\u9ed1\u591c\u8def\u4eba\uff0c\u4e00\u4e2a\u5173\u6ce8\u5f00\u6e90\u6280\u672f\u3001\u4e50\u4e8e\u5b66\u4e60\u3001\u559c\u6b22\u5206\u4eab\u7684\u7a0b\u5e8f\u5458<\/p>\n<p>\u535a\u5ba2\ufffd\ufffd [blog.csdn.net]<\/p>\n<p>\u5fae\u535a\ufffd\ufffd [weibo.com]<\/p>\n<p>\u5fae\u4fe1\uff1aheiyeluren2012  <\/p>\n<p>\u60f3\u83b7\u53d6\u66f4\u591aIT\u5f00\u6e90\u6280\u672f\u76f8\u5173\u4fe1\u606f\uff0c\u6b22\u8fce\u5173\u6ce8\u5fae\u4fe1\uff01<\/p>\n<p>\u5fae\u4fe1\u4e8c\u7ef4\u7801\u626b\u63cf\u5feb\u901f\u5173\u6ce8\u672c\u53f7\u7801\uff1a<\/p>\n<p>\u4f5c\u8005\uff1aheiyeshuwu \u53d1\u8868\u4e8e2015\/7\/21 20:12:43 \u539f\u6587\u94fe\u63a5 \u9605\u8bfb\uff1a35 \u8bc4\u8bba\uff1a0 \u67e5\u770b\u8bc4\u8bba<\/p>\n","protected":false},"excerpt":{"rendered":"<p>From: http:\/\/blog.csdn.net\/heiyeshuwu\/ar &hellip; <a href=\"https:\/\/chen-hongyi.com\/?p=232\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-232","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/posts\/232","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=232"}],"version-history":[{"count":5,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/posts\/232\/revisions"}],"predecessor-version":[{"id":246,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/posts\/232\/revisions\/246"}],"wp:attachment":[{"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}