{"id":57853,"date":"2025-08-15T21:00:27","date_gmt":"2025-08-15T13:00:27","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/57853.html"},"modified":"2025-08-15T21:00:27","modified_gmt":"2025-08-15T13:00:27","slug":"pca%e9%99%8d%e7%bb%b4-%e6%8f%90%e5%8d%87%e6%a8%a1%e5%9e%8b%e8%ae%ad%e7%bb%83%e6%95%88%e7%8e%87","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/57853.html","title":{"rendered":"PCA\u964d\u7ef4 \u63d0\u5347\u6a21\u578b\u8bad\u7ec3\u6548\u7387"},"content":{"rendered":"<p id=\"main-toc\">\u76ee\u5f55<\/p>\n<p id=\"-toc\" style=\"margin-left:0px\">\n<p id=\"%E4%B8%80.PCA%E6%96%B9%E6%B3%95%E9%99%8D%E7%BB%B4%E4%BB%8B%E7%BB%8D-toc\" style=\"margin-left:0px\">\u4e00.PCA\u65b9\u6cd5\u964d\u7ef4\u4ecb\u7ecd<\/p>\n<p id=\"%E4%BA%8C.PCA%E4%B8%8E%E9%9A%8F%E6%9C%BA%E6%A3%AE%E6%9E%97%E7%9A%84%E5%8C%BA%E5%88%AB-toc\" style=\"margin-left:0px\">\u4e8c.PCA\u4e0e\u968f\u673a\u68ee\u6797\u7684\u533a\u522b<\/p>\n<p 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style=\"background-color:transparent\">\u4e8c.PCA\u4e0e\u968f\u673a\u68ee\u6797\u7684\u533a\u522b<\/h2>\n<ul>\n<li>\u968f\u673a\u68ee\u6797\u901a\u8fc7\u7279\u5f81\u91cd\u8981\u6027\u6392\u540d\u8f85\u52a9\u7279\u5f81\u9009\u62e9&#xff0c;\u76ee\u7684\u662f\u4f18\u5316\u7279\u5f81\u96c6&#xff08;\u5982\u66ff\u6362\u4f4e\u6548\u7279\u5f81&#xff09;<\/li>\n<li>PCA\u9002\u7528\u4e8e\u7279\u5f81\u5df2\u56fa\u5b9a\u4f46\u7ef4\u5ea6\u8fc7\u9ad8\u7684\u60c5\u51b5&#xff0c;\u901a\u8fc7\u6570\u636e\u538b\u7f29\u63d0\u5347\u6a21\u578b\u8bad\u7ec3\u6548\u7387<\/li>\n<\/ul>\n<h2 id=\"%E4%B8%89.PCA%E9%99%8D%E7%BB%B4%E7%9A%84%E6%A0%B8%E5%BF%83%E6%80%9D%E6%83%B3\" style=\"background-color:transparent\">\u4e09.PCA\u964d\u7ef4\u7684\u6838\u5fc3\u601d\u60f3<\/h2>\n<h3 id=\"1.%E5%9F%BA%EF%BC%88%E5%9F%BA%E5%90%91%E9%87%8F%EF%BC%89%E4%B8%8E%E5%9D%90%E6%A0%87%E7%B3%BB%E5%8F%98%E6%8D%A2\" style=\"background-color:transparent\">1.\u57fa&#xff08;\u57fa\u5411\u91cf&#xff09;\u4e0e\u5750\u6807\u7cfb\u53d8\u6362<\/h3>\n<ul>\n<li>\u57fa\u662f\u63cf\u8ff0\u5411\u91cf\u7a7a\u95f4\u7684\u57fa\u7840\u5de5\u5177&#xff0c;\u901a\u8fc7\u5750\u6807\u7cfb&#xff08;\u5982X\u8f74\u3001Y\u8f74\u7684\u5355\u4f4d\u5411\u91cf&#xff09;\u5b9a\u4e49\u70b9\u7684\u4f4d\u7f6e\u3002<\/li>\n<li>\u5750\u6807\u7cfb\u53d8\u6362&#xff08;\u57fa\u53d8\u5316&#xff09;\u4f1a\u6539\u53d8\u70b9\u7684\u5750\u6807\u8868\u793a\u3002\u539f\u5750\u6807\u7cfb\u4e0b\u7684\u70b9\u5728\u65b0\u5750\u6807\u7cfb&#xff08;\u4e2d\u5750\u6807\u9700\u91cd\u65b0\u8ba1\u7b97&#xff0c;\u70b9\u7684\u5750\u6807\u503c\u901a\u8fc7\u6295\u5f71\u5230\u65b0\u57fa\u5411\u91cf\u8ba1\u7b97<\/li>\n<li>\u65b0\u5750\u6807\u7cfb\u7684\u5355\u4f4d\u65b9\u5411\u5411\u91cf\u9700\u5f52\u4e00\u5316&#xff08;\u5982\u539f\u65b9\u5411\u5411\u91cf(1,1)\u7684\u5355\u4f4d\u957f\u5ea6\u4e3a\u221a2&#xff0c;\u5f52\u4e00\u5316\u4e3a(\u221a2\/2, 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id=\"1.%E4%BC%98%E7%82%B9\">1.\u4f18\u70b9<\/h3>\n<ul>\n<li>\u8ba1\u7b97\u7b80\u5355&#xff0c;\u6613\u4e8e\u5b9e\u73b0\u3002<\/li>\n<li>\u51cf\u5c11\u7279\u5f81\u7b5b\u9009\u5de5\u4f5c\u91cf<\/li>\n<li>\u4fdd\u7559\u5927\u90e8\u5206\u6709\u6548\u4fe1\u606f&#xff0c;\u9002\u5408\u9ad8\u7ef4\u6570\u636e\u538b\u7f29\u3002<\/li>\n<\/ul>\n<h3 id=\"2.%E7%BC%BA%E7%82%B9\">2.\u7f3a\u70b9<\/h3>\n<ul>\n<li>\u964d\u7ef4\u540e\u7279\u5f81\u5931\u53bb\u539f\u59cb\u542b\u4e49&#xff08;\u4e0d\u53ef\u89e3\u91ca\u6027&#xff09;\u3002<\/li>\n<li>\u8981\u6c42\u8f93\u5165\u6570\u636e\u4e3a\u8fde\u7eed\u53d8\u91cf\u3002<\/li>\n<li>\u53ef\u80fd\u4e22\u5f03\u8d21\u732e\u7387\u4f4e\u4f46\u91cd\u8981\u7684\u6210\u5206\u3002<\/li>\n<\/ul>\n<h2 id=\"%E4%BA%94.PCA%E4%BB%A3%E7%A0%81%E5%AE%9E%E7%8E%B0%E4%B8%8E%E6%A0%B8%E5%BF%83%E5%8F%82%E6%95%B0\">\u4e94.PCA\u4ee3\u7801\u5b9e\u73b0\u4e0e\u6838\u5fc3\u53c2\u6570<\/h2>\n<h3 id=\"1.PCA%E5%AF%BC%E5%85%A5\">1.PCA\u5bfc\u5165<\/h3>\n<p>\u4f7f\u7528\u00a0sklearn.decomposition.PCA<\/p>\n<p>from sklearn.decomposition import PCA <\/p>\n<h3 id=\"2.%E6%A0%B8%E5%BF%83%E5%8F%82%E6%95%B0\">2.\u6838\u5fc3\u53c2\u6570<\/h3>\n<p>\u6e90\u7801\u5982\u4e0b:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"689\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815125957-689f2f4d2af8d.png\" width=\"1542\" \/><\/p>\n<p>\u6838\u5fc3\u53c2\u6570\u4e3an_components\u5373\u76ee\u6807\u7ef4\u5ea6<\/p>\n<h2 id=\"%E5%85%AD.%E6%A1%88%E4%BE%8B%E5%AE%9E%E7%8E%B0\">\u516d.\u6848\u4f8b\u5b9e\u73b0<\/h2>\n<p>\u73b0\u5728\u6709creditcard.csv\u6587\u4ef6\u5b58\u653e\u94f6\u884c\u8d37\u6b3e\u7528\u6237\u7684\u4fe1\u606f&#xff0c;\u6587\u4ef6\u5171\u670931\u5217&#xff0c;\u7b2c\u4e00\u5217\u662f\u8d37\u6b3e\u65f6\u95f4&#xff0c;\u6700\u540e\u4e00\u5217\u662f\u7c7b\u522b1\u8868\u793a\u6ca1\u6709\u8d37\u6b3e\u8d44\u683c&#xff0c;0\u8868\u793a\u5177\u6709\u8d37\u6b3e\u8d44\u683c&#xff0c;\u9700\u8981\u6ce8\u610fAmount\u5217\u7684\u6570\u636e\u6ca1\u6709\u505a\u6807\u51c6\u5316<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"721\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815130007-689f2f57337c4.png\" width=\"1648\" \/><\/p>\n<h3 id=\"1.%E8%AF%BB%E5%8F%96%E6%95%B0%E6%8D%AE\">1.\u8bfb\u53d6\u6570\u636e<\/h3>\n<p>\u6587\u4ef6\u6709\u5217\u540d&#xff0c;\u7528pandas\u8bfb\u53d6\u6587\u4ef6&#xff0c;\u5e76\u5bf9Amount\u5217\u7684\u6570\u636e\u505a\u6807\u51c6\u5316\u5904\u7406<\/p>\n<p>import pandas as pd<br \/>\ndata&#061;pd.read_csv(&#039;creditcard.csv&#039;)<br \/>\n# \u6570\u636e\u6807\u51c6\u5316<br \/>\nfrom sklearn.preprocessing import StandardScaler<br \/>\nscaler&#061;StandardScaler()<br \/>\ndata[&#039;Amount&#039;]&#061;scaler.fit_transform(data[[&#039;Amount&#039;]])<\/p>\n<p>\u5220\u9664\u65e0\u5173\u5217time<\/p>\n<p>data&#061;data.drop([&#039;Time&#039;],axis&#061;1) <\/p>\n<h3 id=\"2.%E5%88%92%E5%88%86%E6%95%B0%E6%8D%AE\">2.\u5212\u5206\u6570\u636e<\/h3>\n<p>\u5212\u5206\u7279\u5f81\u548c\u5206\u7c7b\u7ed3\u679c<\/p>\n<p>X&#061;data.iloc[:,:-1]<br \/>\ny&#061;data.iloc[:,-1] <\/p>\n<h3 id=\"3.%E5%88%92%E5%88%86%E8%AE%AD%E7%BB%83%E6%95%B0%E6%8D%AE%E5%92%8C%E6%B5%8B%E8%AF%95%E6%95%B0%E6%8D%AE\">3.\u5212\u5206\u8bad\u7ec3\u6570\u636e\u548c\u6d4b\u8bd5\u6570\u636e<\/h3>\n<p>\u5148\u4e0d\u5bf9\u6570\u636e\u8fdb\u884cpca\u964d\u7ef4\u5904\u7406&#xff0c;\u5148\u770b\u4e0d\u5904\u7406\u7684\u6548\u679c<\/p>\n<p>from sklearn.model_selection import train_test_split<br \/>\ntrain_x,test_x,train_y,test_y&#061;train_test_split(X,y,test_size&#061;0.3,random_state&#061;100)<\/p>\n<h3 id=\"4.%E8%80%83%E8%99%91%E5%88%B0%E6%AD%A3%E5%8F%8D%E6%A0%B7%E6%9C%AC%E6%95%B0%E9%87%8F%E4%B8%8D%E5%9D%87%E8%A1%A1%EF%BC%8C%E4%BD%BF%E7%94%A8%E8%BF%87%E9%87%87%E6%A0%B7%E6%96%B9%E6%B3%95%E4%BD%BF%E6%95%B0%E6%8D%AE%E5%9D%87%E8%A1%A1\">4.\u8003\u8651\u5230\u6b63\u53cd\u6837\u672c\u6570\u91cf\u4e0d\u5747\u8861&#xff0c;\u4f7f\u7528\u8fc7\u91c7\u6837\u65b9\u6cd5\u4f7f\u6570\u636e\u5747\u8861<\/h3>\n<p>from imblearn.over_sampling import SMOTE<br \/>\noversample&#061;SMOTE(random_state&#061;0)#\u4fdd\u8bc1\u6570\u636e\u62df\u5408\u6548\u679c&#xff0c;\u968f\u673a\u79cd\u5b50<br \/>\nos_x_train,os_y_train&#061;oversample.fit_resample(train_x,train_y) <\/p>\n<h3 id=\"5.%E6%9E%84%E5%BB%BA%E9%80%BB%E8%BE%91%E5%9B%9E%E5%BD%92%E6%A8%A1%E5%9E%8B%E5%AE%8C%E6%88%90%E8%AE%AD%E7%BB%83\">5.\u6784\u5efa\u903b\u8f91\u56de\u5f52\u6a21\u578b\u5b8c\u6210\u8bad\u7ec3<\/h3>\n<p>lr&#061;LogisticRegression()<br \/>\nlr.fit(os_x_train,os_y_train) <\/p>\n<h3 id=\"6.%E9%A2%84%E6%B5%8B%E6%B5%8B%E8%AF%95%E9%9B%86%E5%B9%B6%E6%89%93%E5%8D%B0%E6%95%B0%E6%8D%AE%E6%B2%A1%E6%9C%89%E7%BB%8F%E8%BF%87%E9%99%8D%E7%BB%B4%E5%A4%84%E7%90%86%E7%9A%84%E6%8A%A5%E5%91%8A\">6.\u9884\u6d4b\u6d4b\u8bd5\u96c6\u5e76\u6253\u5370\u6570\u636e\u6ca1\u6709\u7ecf\u8fc7\u964d\u7ef4\u5904\u7406\u7684\u62a5\u544a<\/h3>\n<p>predicted&#061;lr.predict(test_x)<br \/>\nprint(&#039;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;\u6ca1\u6709pca\u5904\u7406\u540e\u62a5\u544a&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#039;)<br \/>\nprint(metrics.classification_report(test_y,predicted)) <\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"514\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815130018-689f2f623dd6d.png\" width=\"1488\" \/><\/p>\n<h3 id=\"7.%E5%AF%B9%E7%89%B9%E5%BE%81%E6%95%B0%E6%8D%AE%E9%9B%86%E8%BF%9B%E8%A1%8CPCA%E9%99%8D%E7%BB%B4\">7.\u5bf9\u7279\u5f81\u6570\u636e\u96c6\u8fdb\u884cPCA\u964d\u7ef4<\/h3>\n<p>\u8bbe\u7f6en_comonent&#061;18<\/p>\n<p>\u4f7f\u7528fit_transform()\u65b9\u6cd5\u5c06\u539f\u6765\u768429\u7ef4\u964d\u7ef4\u621018\u7ef4\u6570\u636e<\/p>\n<p>pca&#061;PCA(n_components&#061;18)<br \/>\nX_pca&#061;pca.fit_transform(X) <\/p>\n<h3 id=\"8.%E9%87%8D%E5%A4%8D%E4%B8%8A%E8%BF%B0%E6%93%8D%E4%BD%9C%E8%BF%9B%E8%A1%8C%E6%95%B0%E6%8D%AE%E7%9A%84%E5%88%92%E5%88%86%EF%BC%8C%E8%AE%AD%E7%BB%83%E5%92%8C%E9%A2%84%E6%B5%8B\">8.\u91cd\u590d\u4e0a\u8ff0\u64cd\u4f5c\u8fdb\u884c\u6570\u636e\u7684\u5212\u5206&#xff0c;\u8bad\u7ec3\u548c\u9884\u6d4b \u00a0<\/h3>\n<p>train_x1,test_x1,train_y1,test_y1&#061;train_test_split(X_pca,y,test_size&#061;0.3,random_state&#061;100)<\/p>\n<p># \u8fc7\u91c7\u6837\u64cd\u4f5c<br \/>\nfrom imblearn.over_sampling import SMOTE<br \/>\noversample&#061;SMOTE(random_state&#061;0)#\u4fdd\u8bc1\u6570\u636e\u62df\u5408\u6548\u679c&#xff0c;\u968f\u673a\u79cd\u5b50<br \/>\nos_x_train,os_y_train&#061;oversample.fit_resample(train_x1,train_y1)<br \/>\nlr1&#061;LogisticRegression()<br \/>\nlr1.fit(os_x_train,os_y_train)<br \/>\npredicted&#061;lr1.predict(test_x1)<br \/>\nprint(&#039;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;pca\u5904\u7406\u540e\u62a5\u544a&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#039;)<br \/>\nprint(metrics.classification_report(test_y1,predicted)) <\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"478\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815130021-689f2f65d98f8.png\" width=\"1572\" \/><\/p>\n<h3 id=\"9.%E5%AE%8C%E6%95%B4%E4%BB%A3%E7%A0%81\">9.\u5b8c\u6574\u4ee3\u7801<\/h3>\n<p>from sklearn.decomposition import PCA<br \/>\nfrom sklearn.model_selection import train_test_split<br \/>\nimport pandas as pd<br \/>\nfrom sklearn.linear_model import LogisticRegression<br \/>\nfrom sklearn import metrics<br \/>\ndata&#061;pd.read_csv(&#039;creditcard.csv&#039;)<br \/>\n# \u6570\u636e\u6807\u51c6\u5316<br \/>\nfrom sklearn.preprocessing import StandardScaler<br \/>\nscaler&#061;StandardScaler()<br \/>\ndata[&#039;Amount&#039;]&#061;scaler.fit_transform(data[[&#039;Amount&#039;]])<br \/>\ndata&#061;data.drop([&#039;Time&#039;],axis&#061;1)<br \/>\nX&#061;data.iloc[:,:-1]<br \/>\ny&#061;data.iloc[:,-1]<br \/>\n# \u4e0d\u964d\u7ef4<br \/>\ntrain_x,test_x,train_y,test_y&#061;train_test_split(X,y,test_size&#061;0.3,random_state&#061;100)<br \/>\nfrom imblearn.over_sampling import SMOTE<br \/>\noversample&#061;SMOTE(random_state&#061;0)#\u4fdd\u8bc1\u6570\u636e\u62df\u5408\u6548\u679c&#xff0c;\u968f\u673a\u79cd\u5b50<br \/>\nos_x_train,os_y_train&#061;oversample.fit_resample(train_x,train_y)<br \/>\nlr&#061;LogisticRegression()<br \/>\nlr.fit(os_x_train,os_y_train)<br \/>\npredicted&#061;lr.predict(test_x)<br \/>\nprint(&#039;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;\u6ca1\u6709pca\u5904\u7406\u540e\u62a5\u544a&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#039;)<br \/>\nprint(metrics.classification_report(test_y,predicted))<br \/>\n#pca\u964d\u7ef4<br \/>\npca&#061;PCA(n_components&#061;18)<br \/>\nX_pca&#061;pca.fit_transform(X)<\/p>\n<p>train_x1,test_x1,train_y1,test_y1&#061;train_test_split(X_pca,y,test_size&#061;0.3,random_state&#061;100)<\/p>\n<p># \u8fc7\u91c7\u6837\u64cd\u4f5c<br \/>\nfrom imblearn.over_sampling import SMOTE<br \/>\noversample&#061;SMOTE(random_state&#061;0)#\u4fdd\u8bc1\u6570\u636e\u62df\u5408\u6548\u679c&#xff0c;\u968f\u673a\u79cd\u5b50<br \/>\nos_x_train,os_y_train&#061;oversample.fit_resample(train_x1,train_y1)<br \/>\nlr1&#061;LogisticRegression()<br \/>\nlr1.fit(os_x_train,os_y_train)<br \/>\npredicted&#061;lr1.predict(test_x1)<br \/>\nprint(&#039;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;pca\u5904\u7406\u540e\u62a5\u544a&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#039;)<br \/>\nprint(metrics.classification_report(test_y1,predicted)) <\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb163\u6b21\u30021.PCA\u53c8\u53eb\u4e3b\u6210\u5206\u5206\u6790\u6cd5\uff0c\u662f\u4e00\u79cd\u964d\u7ef4\u6280\u672f\uff0c\u7528\u4e8e\u5c06\u9ad8\u7ef4\u6570\u636e\u538b\u7f29\u5230\u4f4e\u7ef4\u6570\u636e2.\u4e0e\u968f\u673a\u68ee\u6797\u7684\u7279\u5f81\u91cd\u8981\u6027\u6392\u540d\u4e0d\u540c\uff0cPCA\u4e0d\u4f1a\u76f4\u63a5\u4e22\u5f03\u4e0d\u91cd\u8981\u7279\u5f81\uff0c\u800c\u662f\u901a\u8fc7\u6570\u5b66\u53d8\u6362\u5b9e\u73b0\u6570\u636e\u538b\u7f29\u3002<\/p>\n","protected":false},"author":2,"featured_media":57848,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[6082,81,3676,50,207,427],"topic":[],"class_list":["post-57853","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-pca","tag-python","tag-sklearn","tag-50","tag-207","tag-427"],"yoast_head":"<!-- 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content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb163\u6b21\u30021.PCA\u53c8\u53eb\u4e3b\u6210\u5206\u5206\u6790\u6cd5\uff0c\u662f\u4e00\u79cd\u964d\u7ef4\u6280\u672f\uff0c\u7528\u4e8e\u5c06\u9ad8\u7ef4\u6570\u636e\u538b\u7f29\u5230\u4f4e\u7ef4\u6570\u636e2.\u4e0e\u968f\u673a\u68ee\u6797\u7684\u7279\u5f81\u91cd\u8981\u6027\u6392\u540d\u4e0d\u540c\uff0cPCA\u4e0d\u4f1a\u76f4\u63a5\u4e22\u5f03\u4e0d\u91cd\u8981\u7279\u5f81\uff0c\u800c\u662f\u901a\u8fc7\u6570\u5b66\u53d8\u6362\u5b9e\u73b0\u6570\u636e\u538b\u7f29\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/57853.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-15T13:00:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815125957-689f2f4d2af8d.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta 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