{"id":283,"date":"2018-02-26T12:29:55","date_gmt":"2018-02-26T04:29:55","guid":{"rendered":"https:\/\/cms.ersinfotech.com\/boyidata\/2018\/02\/26\/%e3%80%90%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0%e7%ae%97%e6%b3%95%e3%80%91%e5%ae%9e%e4%be%8b%e8%af%a6%e8%a7%a3%ef%bc%9a%e8%bf%90%e7%94%a8k-means%e8%81%9a%e7%b1%bb%e6%8e%a2%e7%b4%a2dog%26cat%e7%9a%84%e2\/"},"modified":"2018-02-26T12:29:55","modified_gmt":"2018-02-26T04:29:55","slug":"%e3%80%90%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0%e7%ae%97%e6%b3%95%e3%80%91%e5%ae%9e%e4%be%8b%e8%af%a6%e8%a7%a3%ef%bc%9a%e8%bf%90%e7%94%a8k-means%e8%81%9a%e7%b1%bb%e6%8e%a2%e7%b4%a2dog%26cat%e7%9a%84%e2","status":"publish","type":"post","link":"https:\/\/cms.ersinfotech.com\/boyidata\/2018\/02\/26\/%e3%80%90%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0%e7%ae%97%e6%b3%95%e3%80%91%e5%ae%9e%e4%be%8b%e8%af%a6%e8%a7%a3%ef%bc%9a%e8%bf%90%e7%94%a8k-means%e8%81%9a%e7%b1%bb%e6%8e%a2%e7%b4%a2dog%26cat%e7%9a%84%e2\/","title":{"rendered":"\u3010\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u3011\u5b9e\u4f8b\u8be6\u89e3\uff1a\u8fd0\u7528K-means\u805a\u7c7b\u63a2\u7d22dog&cat\u7684\u201c\u7231\u6068\u60c5\u4ec7\u201d"},"content":{"rendered":"

\u672c\u7bc7\u63a2\u8ba8\u6587\u672c\u578b\u6570\u636e\u5982\u4f55\u8fdb\u884cK-means\u805a\u7c7b\u3002<\/span><\/p>\n

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\u6211\u4eec\u5206\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u6b65\u9aa4\u6765\u8fdb\u884c\uff1a<\/span><\/p>\n

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1\u3001\u8f93\u5165\u5404\u6587\u6863\u6570\u636e<\/span><\/p>\n

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2\u3001\u5207\u8bcd<\/span><\/p>\n

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3\u3001\u6574\u5408\u6587\u6863<\/span><\/p>\n

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4\u3001\u8ba1\u7b97tf-idf\u6743\u91cd\u77e9\u9635<\/span><\/p>\n

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5\u3001\u53d6K\u503c\uff0c\u8fdb\u884cK-means\u805a\u7c7b<\/span><\/p>\n

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6\u3001\u5224\u65ad\u805a\u7c7b\u6548\u679c<\/span><\/p>\n

<\/p>\n<\/section>\n<\/section>\n<\/section>\n

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\u9996\u5148\uff0c\u6211\u4eec\u4e00\u8d77\u6765\u770b\u770bdog&cat\u7231\u60c5\u6545\u4e8b\u7684\u805a\u7c7b\u60c5\u51b5\u662f\u600e\u6837\uff01\u4ee5\u4e0b\u662f\u6587\u6863\u7684\u6570\u636e\uff1a<\/span><\/span><\/p>\n

\u7b2c\u4e00\u4efdtxt : i love dog.<\/strong><\/span><\/p>\n

\u7b2c\u4e8c\u4efdtxt: i love cat.<\/strong><\/span><\/p>\n

\u7b2c\u4e09\u4efdtxt: <\/strong><\/span>dog.<\/strong><\/span><\/p>\n

\u7b2c\u56db\u4efdtxt: cat love dog?<\/strong><\/span><\/p>\n


<\/p>\n

\u8fd94\u4efd\u6587\u6863\uff0c\u7b80\u5355\u7684\u56db\u53e5\u8bdd\uff0c\u5982\u679c\u5206\u4e3a2\u7c7b\uff0c\u662f1&2\u30013&4\uff0c\u8fd8\u662f1&3\u30012&4\uff0c\u53c8\u6216\u662f\u5176\u4ed6\u60c5\u51b5\u5462\uff1f\u4e0d\u59a8\u81ea\u5df1\u5148\u51ed\u76f4\u89c9\u5c06\u4ed6\u4eec\u5206\u7c7b\uff0c\u518d\u6765\u770b\u770b\u7528K-means\u805a\u7c7b\u6cd5\u540e\u7684\u5f97\u51fa\u7684\u7ed3\u679c\u662f\u5426\u548c\u4f60\u7684\u731c\u6d4b\u4e00\u6837\u3002 <\/span><\/p>\n


<\/p>\n

\u6211\u4eec\u5c06\u6b65\u9aa42\uff08\u5207\u8bcd<\/strong>\uff09\u548c\u6b65\u9aa43\uff08\u6574\u5408\u6587\u6863<\/strong>\uff09\u5408\u4e00\u8d77\uff0c\u5f97\u5230\uff1a<\/span><\/p>\n


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<\/p>\n

\u63a5\u4e0b\u6765\uff0c\u8ba1\u7b97tf-idf\u6743\u91cd\u77e9\u9635<\/strong><\/span><\/span><\/p>\n


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<\/p>\n

\u2191\u2191\u2191\u4ee5\u4e0a\u662f<\/span>\u539f\u59cb<\/strong><\/span>\u6c42tf-idf\u7684\u516c\u5f0f<\/span><\/span><\/p>\n


<\/p>\n

\u4e3a\u4e86\u627f\u63a5\u6211\u4e0b\u4e2a\u95ee\u9898\uff0c\u5148\u5c06\u7b2c\u4e00\u4e2a\u6587\u6863\u7684\u300cdog\u300d\u6539\u6210\u300cyou\u300d\uff0c\u5373<\/span><\/span><\/p>\n


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<\/p>\n

\u6309\u7167\u539f\u59cb\u516c\u5f0f\uff0c\u6709<\/span><\/p>\n

you -tf =1\/3 <\/strong><\/span><\/p>\n

you -idf = log(4\/2)=0.301    <\/strong><\/span><\/p>\n

tf*idf=0.333*0.301=0.1<\/strong><\/span><\/p>\n


<\/p>\n

\u90a3\u4e48\u95ee\u9898\u6765\u4e86\uff0c\u5c06\u300cyou\u300d\u6539\u4e3a\u300cdog\u300d\uff0c\u90a3\u300cdog \u300d\u5462?  \u7ecf\u8ba1\u7b97\u51fa\u6765\u662f0\uff1f\u8fd9\u65f6\u5019\u6709\u4eba\u63d0\u51fa\u4e86\uff1a<\/span>\u6211\u7528Python\u8f6f\u4ef6\u8ba1\u7b97\u51fa\u6765\u7684\u5e77\u4e0d\u662f0\u554a<\/strong><\/span>\uff01\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u6837\uff1f<\/span><\/p>\n


<\/p>\n

\u9996\u5148\u6309\u7167\u539f\u59cb\u516c\u5f0f\u8ba1\u7b97\u51fa\u6765\u662f0\uff0c\u4e5f\u662f\u8bf4\u5f97\u8fc7\u53bb\u7684\uff0c4\u4e2a\u6587\u6863\uff0c\u67093\u4e2a\u6587\u6863\u90fd\u8bf4\u5230\u4e86dog,\u653e\u5927\u6765\u8bf4\uff0c1000\u4e2a\u6587\u6863\uff0c\u5c31\u6709999\u4e2a\u6587\u6863\u90fd\u8bf4\u5230\u4e86dog\uff0c\u90a3\u4e48\u518d\u6765\u627e\u7279\u5f81\u8bcddog\u4e5f\u5c31\u6ca1\u6709\u4e86\u610f\u4e49\u4e86\u4e0d\u662f\uff1f\u4f46\u4e3a\u4ec0\u4e48\u6709\u4eba\u5c31\u8bf4\u7528\u8f6f\u4ef6\u7b97\u51fa\u6765\u7684dog\u5728\u7b2c\u4e00\u4efd\u6587\u6863\u7684tf-idf\u6743\u503c\u4e0d\u662f0\u5462\uff1f<\/span><\/p>\n


<\/p>\n

\u8fd9\u5c31\u5f97\u5f15\u5165Python\u91cc\u9762<\/span>scikit-learn<\/strong><\/span>\u5de5\u5177\u8c03\u7528\u7684<\/span>TfidfTransformer()<\/strong><\/span>\u51fd\u6570\u4e86\uff0c\u6211\u4eec\u5148\u6765\u6253\u4e2a\u9884\u9632\u9488\u2014\u2014\u8fd9\u91cc\u7528\u5230\u7684\u516c\u5f0f\u548c\u539f\u59cb\u7684\u516c\u5f0f\u662f\u4e0d\u4e00\u6837\u7684\u3002<\/span><\/p>\n


<\/p>\n

scikit-learn \u4e2d\u5b9e\u73b0\u7684tf\u4e3a\u8bcd\u9891,df\u4e3a\u6587\u6863\u9891\u7387\uff0cidf\u548ctf-idf\u5206\u522b\u662f<\/span><\/p>\n


<\/p>\n

<\/p>\n


<\/p>\n

\u5728scikit-learn\u4e2d\u4f7f\u7528\u7684tf-idf\u516c\u5f0f\u4e3a\uff1a<\/span><\/p>\n


<\/p>\n

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<\/p>\n

\u4e00\u822c\u5728\u8ba1\u7b97tf-idf\u4e4b\u524d\u90fd\u4f1a\u5bf9\u539f\u59cb\u8bcd\u9891\u8fdb\u884c<\/span>\u5f52\u4e00\u5316<\/strong><\/span>\u5904\u7406\uff0cTfidfTransformer\u5c31\u76f4\u63a5\u5bf9tf-idf\u505a\u4e86\u5f52\u4e00\u5316\uff0cscikit-learn\u4e2d\u7684 TfidfTransformer\u4f7f\u7528\u4e86L2\u5f52\u4e00\u5316<\/span><\/p>\n


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<\/p>\n

\u597d\u4e86\uff0c\u90a3\u4e48\u53ef\u4ee5\u6765\u8ba1\u7b97dog \u7684<\/span>tf-idf<\/strong><\/span><\/span>\uff1a<\/span><\/p>\n

\u5728\u7b2c\u4e00\u4efd\u6863\u4e2ddog\u7684tf\u4e3a1,df\u4e3a3\uff0c<\/span>idf<\/strong><\/span>\u548c<\/span>tf-idf<\/strong><\/span>\u5206\u522b\u662f<\/span><\/p>\n


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<\/p>\n

\u540c\u6837\u53ef\u8ba1\u7b97\u51falove\u7684tf-idf\u4e3a1.097\uff0c\u8fdb\u884c<\/span>\u5f52\u4e00\u5316\u5904\u7406<\/strong><\/span><\/span><\/span><\/p>\n


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<\/p>\n

\u6765\u770b\u770b\u7528Python\u505a\u51fa\u6765\u7684\u7ed3\u679c\u662f\u4ec0\u4e48\uff1a<\/span><\/p>\n


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<\/p>\n


<\/p>\n

\u8fd9\u5c31\u5bf9\u5e94\u4e0a\u4e86\u662f\u4e0d\u662f\uff1f\u4e0d\u8fc7\uff0c\u522b\u9ad8\u5174\u592a\u65e9\uff0c\u63a5\u4e0b\u6765\u8be5\u600e\u4e48\u8fdb\u884c<\/span>\u805a\u7c7b<\/strong><\/span><\/span>\uff1f<\/span><\/p>\n


<\/p>\n

\u53ef\u4ee5\u8054\u60f3\u5230\u4e0a\u5468\u6211\u4eec\u5bf9brother\u4f8b\u5b50\u7684\u805a\u7c7b\u3002Brother\u4f8b\u5b50\u662f\u4e8c\u7ef4\u7684\uff0c\u800c\u6211\u4eec\u8fd9\u6b21\u662f\u4e09\u7ef4\u7684\uff0c\u4f46\u601d\u7ef4\u662f\u4e00\u6837\u7684\u5594\uff01<\/span><\/p>\n


<\/p>\n

\u8ba1\u7b97\u8fc7\u7a0b\u53ef\u770b\uff1a\u4f9d\u65e7\u53d6<\/span> K = 2<\/strong><\/span><\/span><\/span><\/p>\n


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<\/p>\n

\u5982\u6b64\uff0ca1\u548ca3\u4e3a\u4e00\u7c7b\uff1ba2\u548ca4\u4e3a\u4e00\u7c7b\u3002(\u662f\u5426\u548c\u4f60\u4e00\u5f00\u59cb\u731c\u6d4b\u7684\u7ed3\u679c\u76f8\u7b26\uff0c\u53ef\u5426\u63a5\u53d7\uff1f)<\/span><\/p>\n


<\/p>\n

\u8fd9\u65f6\u53c8\u6709\u4e2a\u7591\u95ee\uff1a\u6211\u60f3\u77e5\u9053\u8fd94\u4efd\u6587\u6863<\/span>\u5206\u62102\u7c7b\u5408\u9002\u5417<\/strong><\/span>\uff1f\u662f\u6700\u4f18\u7684\u5417\uff1f\u5982\u679c\u4e0d\u662f\u6700\u4f18\u7684\uff0c\u90a3<\/span>K = \uff1f<\/strong><\/span>\u624d\u662f\u6700\u4f18\u7684\u5462\uff1f<\/span><\/p>\n


<\/p>\n

\u8fd9\u91cc\u5f15\u5165<\/span>SK\u6307\u6807<\/strong><\/span>\u3002SK\u6307\u6807\u662f\u7528\u6765\u5224\u65ad\u805a\u7c7b\u6548\u679c\u3002<\/span><\/p>\n


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\u5176\u4e2dCi\u8868\u793a\u7b2ci\u7c7b\u6570\u636e\u5bf9\u8c61\u7684\u96c6\u5408\u3002Ci\u662f\u7c07Ci\u7684\u8d28\u5fc3\uff0cK\u8868\u793a\u8be5\u6570\u636e\u96c6\u53ef\u4ee5\u5212\u5206\u4e3aK\u4e2a\u7c07\u7684\u96c6\u5408\uff0cdist\u662f\u6b27\u51e0\u91cc\u5fb7\u7a7a\u95f4\u91cc2\u4e2a\u7a7a\u95f4\u5bf9\u8c61\u4e4b\u95f4\u7684\u6b27\u5f0f\u8ddd\u79bb\u3002<\/span><\/p>\n


<\/p>\n

\u8bef\u5dee\u5e73\u65b9\u548c<\/span>SSE\u503c\u8d8a\u5c0f<\/strong><\/span>\uff0c\u8bf4\u660e\u6570\u636e\u70b9\u8d8a\u63a5\u8fd1\u4e8e\u5b83\u4eec\u7684\u8d28\u5fc3\uff0c\u7c07\u7c7b\u6548\u679c\u4e5f\u5c31\u8d8a\u597d\u3002<\/span><\/p>\n


<\/p>\n

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<\/p>\n

\u901a\u8fc7\u8ba1\u7b97SK\u7684\u5927\u5c0f\uff0c\u6765\u53cd\u63a8\u51fa\u6700\u4f73\u7c07\u7c7b\u4e2a\u6570\u7684\u9009\u53d6\uff0c<\/span>SK\u8d8a\u5c0f<\/strong><\/span>\uff0c\u8bf4\u660e\u805a\u7c7b\u6548\u679c\u8d8a\u597d\uff0c\u5e77\u4e14\u5bf9\u5e94\u7684K\u503c\u5373\u4e3a\u6700\u4f73\u7684\u7c07\u7c7b\u4e2a\u6570\u3002<\/span><\/p>\n


<\/p>\n

\u50cf\u521a\u624ddog&cat\u7231\u60c5\u6545\u4e8b\u4f8b\u5b50\uff0c\u8003\u8651K=2\u548cK=3\u5373\u53ef\u3002<\/span><\/p>\n


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<\/p>\n

\u5f53K=2\u65f6\uff0cSSK=0.447\uff0cSK=0.893\uff1b\u540c\u6837\uff0c\u5f53K=3\u65f6\uff0cSSK=0.154\uff0cSK=0.462\u3002\u6240\u4ee5\u5206\u4e09\u7c7b\uff0c<\/span>1\u6587\u6863\u4e00\u7c7b\uff0c2\u548c4\u6587\u6863\u4e3a\u4e00\u7c7b\uff0c3\u4e3a\u4e00\u7c7b\u6548\u679c\u6700\u4f73<\/strong><\/span><\/span>\u3002<\/span><\/p>\n


<\/p>\n

\u4e0b\u9762\u6765\u770b\u770b\u7528Python\u7a0b\u5e8f\u8fd0\u884c\u51fa\u6765\u7684\u7ed3\u679c:<\/span><\/p>\n

\u9996\u5148\u7528<\/span>jiaba<\/strong><\/span>\u5e93\u4ee5\u53ca\u5bfc\u5165\u81ea\u5b9a\u4e49\u8bcd\u5178\u8fdb\u884c\u5206\u8bcd\u5e77\u8f93\u51fa\u8bed\u6599\u5e93\uff1b<\/span><\/span><\/p>\n


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<\/p>\n

\u5f15\u5165sklearn \u6a21\u5757\u8c03\u7528\u7684<\/span>TfidfTransformer<\/strong><\/span>\u3001<\/span>CountVectorizer<\/strong><\/span>\u51fd\u6570\u6765\u8ba1\u7b97TFIDF\u77e9\u9635\u5e77\u8fdb\u884cK-means\u805a\u7c7b\uff1b<\/span><\/p>\n


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<\/p>\n

\u5f53K=2\u65f6\uff0c\u6709\uff1a<\/span><\/p>\n


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<\/p>\n


<\/p>\n

\u8bef\u5dee\u5e73\u65b9\u548cSSK=0.447\uff0c\u5176SK=0.893\uff1b<\/span><\/p>\n


<\/p>\n

\u5f53K=3\u65f6\uff0c\u6709\uff1a<\/span><\/p>\n


<\/p>\n

<\/p>\n


<\/p>\n

\u8bef\u5dee\u5e73\u65b9\u548cSSK=0.154\uff0c\u5176SK=0.462\uff1b\u6240\u4ee5\u76f8\u6bd4K=2\uff0c<\/span>1\u6587\u6863\u4e00\u7c7b\uff0c2\u548c4\u6587\u6863\u4e3a\u4e00\u7c7b\uff0c3\u4e3a\u4e00\u7c7b\u6548\u679c\u6700\u4f73<\/strong><\/span><\/span>\u3002<\/span><\/p>\n


<\/span><\/p>\n

\u603b\u7ed3\uff1a<\/span><\/strong>\u6bcf\u4e00\u79cd\u7b97\u6cd5\u90fd\u6709\u5176\u4f18\u7f3a\u70b9\uff0c\u6211\u4eec\u4f7f\u7528\u65f6\u66f4\u591a\u8003\u8651\u5176\u662f\u5426\u5408\u9002\u3002K-means\u805a\u7c7b\u6cd5\u7684\u4f18\u70b9\u76f8\u4fe1\u5f88\u591a\u4eba\u90fd\u6df1\u6709\u4f53\u4f1a\u2014\u2014\u539f\u7406\u7b80\u5355\uff0c\u5b9e\u73b0\u5bb9\u6613<\/strong>\uff1b\u800c\u5b83\u6700\u5927\u7f3a\u70b9\u662fK \u503c\u7684\u9009\u5b9a<\/strong>\u975e\u5e38\u96be\u4f30\u8ba1\uff0c\u867d\u7136\u6211\u4eec\u77e5\u9053\u7528SK\u6307\u6807\u53ef\u4ee5\u5224\u65adK \u53d6\u4f55\u503c\u65f6\u6700\u4f18\uff0c\u4f46\u5f53\u6570\u636e\u91cf\u5927\u7684\u65f6\u5019\uff0c\u8fd9\u79cd\u8fed\u4ee3\u7684\u6d88\u8017\u51e0\u4e4e\u6210\u6307\u6570\u500d\u589e\u52a0\u3002<\/span><\/p>\n

<\/p>\n<\/section>\n<\/section>\n<\/section>\n

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