{"id":60955,"date":"2026-01-16T17:57:29","date_gmt":"2026-01-16T09:57:29","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/60955.html"},"modified":"2026-01-16T17:57:29","modified_gmt":"2026-01-16T09:57:29","slug":"%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0-pca%e6%95%b0%e6%8d%ae%e9%99%8d%e7%bb%b4","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/60955.html","title":{"rendered":"\u673a\u5668\u5b66\u4e60\u2014\u2014PCA\u6570\u636e\u964d\u7ef4"},"content":{"rendered":"<h2>\u4e3b\u6210\u5206\u5206\u6790&#xff08;PCA&#xff09;<\/h2>\n<h3>\u4ec0\u4e48\u662f\u4e3b\u6210\u5206\u5206\u6790<\/h3>\n<p>PCA&#xff0c;\u5168\u79f0\u4e3b\u6210\u5206\u5206\u6790&#xff0c;\u672c\u8d28\u4e0a\u662f\u4e00\u79cd\u6570\u636e\u538b\u7f29\u6280\u672f\u3002\u662f\u4e00\u79cd\u901a\u7528\u7684<span 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style=\"color:#000000\">\u6570\u636e\u7684\u7279\u5f81\u53c8\u53eb\u505a\u6570\u636e\u7684\u7ef4\u5ea6&#xff0c;\u51cf\u5c11\u6570\u636e\u7684\u7279\u5f81\u5373\u964d\u7ef4<\/span><\/p>\n<\/p>\n<p><span style=\"color:#ff0000\">\u5982\u4f55\u505a\u5230\u6700\u597d\u7684\u964d\u7ef4\u6548\u679c&#xff1f; <\/span><\/p>\n<p><span style=\"color:#000000\">\u51cf\u5c11\u6570\u636e\u7ef4\u5ea6\u7684\u540c\u65f6&#xff0c;\u80fd\u8f83\u597d\u5730\u4ee3\u8868\u539f\u59cb\u6570\u636e\u3002<\/span><\/p>\n<\/p>\n<h3>\u5982\u4f55\u8fdb\u884c\u4e3b\u6210\u5206\u5206\u6790<\/h3>\n<p>\u867d\u7136 PCA \u80cc\u540e\u6d89\u53ca\u5411\u91cf\u3001\u534f\u65b9\u5dee\u3001\u7279\u5f81\u503c\u7b49\u6570\u5b66\u6982\u5ff5&#xff0c;\u4f46\u6211\u4eec\u5b8c\u5168\u53ef\u4ee5\u8df3\u8fc7\u590d\u6742\u516c\u5f0f&#xff0c;\u7528\u901a\u4fd7\u7684\u903b\u8f91\u7406\u89e3\u5176\u5de5\u4f5c\u6d41\u7a0b&#xff1a;<\/p>\n<\/p>\n<h4>\u7b2c\u4e00\u6b65&#xff1a;\u6570\u636e\u9884\u5904\u7406 &#xff08;\u6570\u636e\u6807\u51c6\u5316&#xff09;<\/h4>\n<p>PCA \u5bf9\u6570\u636e\u7684\u5c3a\u5ea6\u5f88\u654f\u611f&#xff0c;\u6bd4\u5982\u4e00\u4e2a\u7279\u5f81\u7684\u5355\u4f4d\u662f \u201c\u5343\u7c73\u201d&#xff0c;\u53e6\u4e00\u4e2a\u7279\u5f81\u7684\u5355\u4f4d\u662f \u201c\u7c73\u201d&#xff0c;\u6570\u503c\u5dee\u5f02\u4f1a\u5bfc\u81f4\u5206\u6790\u7ed3\u679c\u504f\u5411\u6570\u503c\u5927\u7684\u7279\u5f81\u3002\u56e0\u6b64&#xff0c;\u5728\u8fdb\u884c PCA \u4e4b\u524d&#xff0c;\u9700\u8981\u5148\u5bf9\u6570\u636e\u8fdb\u884c\u6807\u51c6\u5316\u5904\u7406&#xff08;\u6bd4\u5982\u96f6\u5747\u503c\u5316&#xff09;&#xff0c;\u8ba9\u6bcf\u4e2a\u7279\u5f81\u7684\u5747\u503c\u4e3a 0&#xff0c;\u907f\u514d\u56e0\u91cf\u7eb2\u4e0d\u540c\u5e26\u6765\u7684\u504f\u5dee\u3002<\/p>\n<\/p>\n<h4 style=\"background-color:transparent\">\u7b2c\u4e8c\u6b65&#xff1a;\u5bfb\u627e \u201c\u4e3b\u6210\u5206\u201d\u2014\u2014 \u6293\u4f4f\u6570\u636e\u7684\u6838\u5fc3\u65b9\u5411<\/h4>\n<p>PCA \u7684\u6838\u5fc3\u662f\u627e\u5230\u51e0\u4e2a \u201c\u6700\u4f18\u65b9\u5411\u201d&#xff0c;\u8fd9\u4e9b\u65b9\u5411\u5c31\u662f\u4e3b\u6210\u5206\u3002<\/p>\n<p>\u5224\u65ad \u201c\u6700\u4f18\u201d \u7684\u6807\u51c6\u5f88\u7b80\u5355&#xff1a;\u6570\u636e\u5728\u8fd9\u4e2a\u65b9\u5411\u4e0a\u7684\u5206\u5e03\u6700\u5206\u6563\u3002\u56e0\u4e3a\u6570\u636e\u8d8a\u5206\u6563&#xff0c;\u8bf4\u660e\u8fd9\u4e2a\u65b9\u5411\u4e0a\u5305\u542b\u7684\u4fe1\u606f\u8d8a\u591a\u3002<\/p>\n<\/p>\n<h4 style=\"background-color:transparent\">\u7b2c\u4e09\u6b65&#xff1a;\u6570\u636e\u8f6c\u6362 \u2014\u2014 \u5b8c\u6210\u964d\u7ef4\u64cd\u4f5c<\/h4>\n<p>\u627e\u5230 k \u4e2a\u4e3b\u6210\u5206\u540e&#xff0c;\u5c31\u53ef\u4ee5\u5c06\u539f\u59cb\u9ad8\u7ef4\u6570\u636e\u6620\u5c04\u5230\u8fd9 k \u4e2a\u4e3b\u6210\u5206\u6784\u6210\u7684\u65b0\u7a7a\u95f4\u4e2d&#xff0c;\u8fd9\u4e2a\u8fc7\u7a0b\u5c31\u662f\u964d\u7ef4\u3002\u6700\u7ec8\u5f97\u5230\u7684 k \u7ef4\u6570\u636e&#xff0c;\u5c31\u662f PCA \u5904\u7406\u540e\u7684\u7ed3\u679c&#xff0c;\u5b83\u4fdd\u7559\u4e86\u539f\u59cb\u6570\u636e\u7684\u5927\u90e8\u5206\u4fe1\u606f&#xff0c;\u5374\u6709\u7740\u66f4\u7b80\u6d01\u7684\u7ed3\u6784\u3002<\/p>\n<p>\u4e3e\u4e2a\u5b9e\u9645\u5e94\u7528\u573a\u666f&#xff1a;\u67d0\u7535\u5546\u5e73\u53f0\u6536\u96c6\u4e86\u7528\u6237\u7684 10 \u4e2a\u884c\u4e3a\u7279\u5f81&#xff08;\u6d4f\u89c8\u65f6\u957f\u3001\u70b9\u51fb\u6b21\u6570\u3001\u52a0\u8d2d\u6570\u7b49&#xff09;&#xff0c;\u901a\u8fc7 PCA \u63d0\u53d6\u51fa 2 \u4e2a\u4e3b\u6210\u5206&#xff0c;\u7b2c\u4e00\u4e2a\u4e3b\u6210\u5206\u53ef\u7406\u89e3\u4e3a \u201c\u7528\u6237\u6d3b\u8dc3\u5ea6\u201d&#xff0c;\u7b2c\u4e8c\u4e2a\u4e3b\u6210\u5206\u53ef\u7406\u89e3\u4e3a \u201c\u6d88\u8d39\u610f\u613f\u201d\u3002\u539f\u672c 10 \u7ef4\u7684\u7528\u6237\u6570\u636e&#xff0c;\u53d8\u6210\u4e86 2 \u7ef4\u7684 \u201c\u6d3b\u8dc3\u5ea6 &#8211; \u6d88\u8d39\u610f\u613f\u201d \u6570\u636e&#xff0c;\u540e\u7eed\u65e0\u8bba\u662f\u7528\u6237\u5206\u7fa4\u8fd8\u662f\u7cbe\u51c6\u8425\u9500&#xff0c;\u90fd\u53d8\u5f97\u7b80\u5355\u9ad8\u6548\u3002<\/p>\n<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u8fdb\u884c\u4e3b\u6210\u5206\u5206\u6790<\/h2>\n<p>\u5728\u5b9e\u9645\u5e94\u7528\u4e2d&#xff0c;\u9ad8\u7ef4\u6570\u636e\u5e26\u6765\u7684\u95ee\u9898\u8fdc\u6bd4\u6211\u4eec\u60f3\u8c61\u7684\u590d\u6742&#xff0c;\u800c PCA \u6070\u597d\u80fd\u7cbe\u51c6\u89e3\u51b3\u8fd9\u4e9b\u75db\u70b9&#xff1a;<\/p>\n<h3>1. \u544a\u522b \u201c\u7ef4\u5ea6\u707e\u96be\u201d&#xff0c;\u63d0\u5347\u8ba1\u7b97\u6548\u7387<\/h3>\n<p>\u9ad8\u7ef4\u6570\u636e\u4f1a\u8ba9\u8ba1\u7b97\u91cf\u5448\u6307\u6570\u7ea7\u589e\u957f\u3002\u6bd4\u5982\u5728\u673a\u5668\u5b66\u4e60\u4e2d&#xff0c;\u7279\u5f81\u7ef4\u5ea6\u8d8a\u591a&#xff0c;\u6a21\u578b\u8bad\u7ec3\u65f6\u95f4\u8d8a\u957f&#xff0c;\u786c\u4ef6\u5f00\u9500\u4e5f\u8d8a\u5927\u3002\u5982\u679c\u539f\u672c\u6709 100 \u4e2a\u7279\u5f81&#xff0c;\u901a\u8fc7 PCA \u964d\u5230 10 \u4e2a\u4e3b\u6210\u5206&#xff0c;\u8ba1\u7b97\u91cf\u4f1a\u5927\u5e45\u964d\u4f4e&#xff0c;\u6a21\u578b\u8bad\u7ec3\u901f\u5ea6\u53ef\u80fd\u63d0\u5347\u6570\u500d&#xff0c;\u540c\u65f6\u8fd8\u80fd\u907f\u514d\u56e0\u7ef4\u5ea6\u8fc7\u591a\u5bfc\u81f4\u7684\u8fc7\u62df\u5408\u95ee\u9898\u3002<\/p>\n<\/p>\n<h3>2. \u6d88\u9664\u591a\u91cd\u5171\u7ebf\u6027&#xff0c;\u4f18\u5316\u5206\u6790\u7ed3\u679c<\/h3>\n<p>\u5f88\u591a\u5b9e\u9645\u6570\u636e\u4e2d&#xff0c;\u4e0d\u540c\u7279\u5f81\u4e4b\u95f4\u5f80\u5f80\u5b58\u5728\u76f8\u5173\u6027\u3002\u6bd4\u5982 \u201c\u8eab\u9ad8\u201d \u548c \u201c\u4f53\u91cd\u201d \u4e24\u4e2a\u7279\u5f81&#xff0c;\u901a\u5e38\u5448\u6b63\u76f8\u5173\u5173\u7cfb \u2014\u2014 \u8fd9\u79cd\u591a\u91cd\u5171\u7ebf\u6027\u4f1a\u5e72\u6270\u56de\u5f52\u5206\u6790\u3001\u805a\u7c7b\u7b49\u6a21\u578b\u7684\u7ed3\u679c&#xff0c;\u5bfc\u81f4\u53c2\u6570\u4f30\u8ba1\u4e0d\u51c6\u786e\u3002PCA \u901a\u8fc7\u6784\u5efa\u76f8\u4e92\u72ec\u7acb\u7684\u4e3b\u6210\u5206&#xff0c;\u80fd\u5f7b\u5e95\u6d88\u9664\u7279\u5f81\u95f4\u7684\u5197\u4f59\u5173\u8054&#xff0c;\u8ba9\u5206\u6790\u7ed3\u679c\u66f4\u53ef\u9760\u3002<\/p>\n<\/p>\n<h3>3. \u7b80\u5316\u6570\u636e\u53ef\u89c6\u5316&#xff0c;\u4fbf\u4e8e\u76f4\u89c2\u7406\u89e3<\/h3>\n<p>\u4eba\u7c7b\u7684\u8ba4\u77e5\u80fd\u529b\u6709\u9650&#xff0c;\u5f88\u96be\u76f4\u63a5\u7406\u89e3\u4e09\u7ef4\u4ee5\u4e0a\u7684\u6570\u636e\u3002\u800c PCA \u53ef\u4ee5\u5c06\u9ad8\u7ef4\u6570\u636e\u964d\u5230\u4e8c\u7ef4\u6216\u4e09\u7ef4&#xff0c;\u8ba9\u6211\u4eec\u80fd\u591f\u901a\u8fc7\u6563\u70b9\u56fe\u3001\u6298\u7ebf\u56fe\u7b49\u65b9\u5f0f\u76f4\u89c2\u5c55\u793a\u6570\u636e\u5206\u5e03\u3002\u6bd4\u5982\u5c06\u7528\u6237\u884c\u4e3a\u7684\u5341\u51e0\u4e2a\u7279\u5f81\u901a\u8fc7 PCA \u964d\u5230\u4e8c\u7ef4&#xff0c;\u5c31\u80fd\u6e05\u6670\u770b\u5230\u4e0d\u540c\u7528\u6237\u7fa4\u4f53\u7684\u805a\u7c7b\u60c5\u51b5&#xff0c;\u4e3a\u51b3\u7b56\u63d0\u4f9b\u76f4\u89c2\u4f9d\u636e\u3002<\/p>\n<\/p>\n<h3>4.\u566a\u58f0\u8fc7\u6ee4<\/h3>\n<p>PCA \u8fd8\u80fd\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u8fc7\u6ee4\u566a\u58f0\u6570\u636e\u3002\u539f\u59cb\u6570\u636e\u4e2d\u96be\u514d\u5b58\u5728\u6d4b\u91cf\u8bef\u5dee\u7b49\u566a\u58f0&#xff0c;\u8fd9\u4e9b\u566a\u58f0\u901a\u5e38\u5206\u5e03\u5728\u65b9\u5dee\u8f83\u5c0f\u7684\u7ef4\u5ea6\u4e0a&#xff0c;\u800c PCA \u805a\u7126\u4e8e\u65b9\u5dee\u8f83\u5927\u7684\u4e3b\u6210\u5206&#xff0c;\u76f8\u5f53\u4e8e\u81ea\u52a8\u5ffd\u7565\u4e86\u566a\u58f0\u5e26\u6765\u7684\u5e72\u6270&#xff0c;\u8ba9\u6570\u636e\u66f4 \u201c\u5e72\u51c0\u201d\u3002<\/p>\n<\/p>\n<h2>PCA\u4e2d\u7684\u6570\u5b66<\/h2>\n<h3>\u57fa\u53d8\u6362<\/h3>\n<p style=\"text-align:center\"><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260116095727-696a0b87a1443.png\" \/><\/p>\n<p><span style=\"color:#ff0000\">p<\/span><span style=\"color:#ff0000\">i<\/span><span style=\"color:#ff0000\">\u4e3a\u884c\u5411\u91cf,\u8868\u793a\u7b2ci\u4e2a\u57fa&#xff1b; <\/span><\/p>\n<p><span style=\"color:#ff0000\">a<\/span><span style=\"color:#ff0000\">j<\/span><span style=\"color:#ff0000\">\u4e3a\u5217\u5411\u91cf,\u8868\u793a\u7b2cj\u4e2a\u6570\u636e<\/span><\/p>\n<h3>\u57fa\u53d8\u6362\u7684\u542b\u4e49<\/h3>\n<p><span style=\"color:#000000\">1.\u4e24\u4e2a\u77e9\u9635\u76f8\u4e58\u7684\u610f\u4e49\u662f\u5c06\u53f3\u8fb9\u77e9\u9635\u4e2d\u7684\u6bcf\u4e00\u5217\u5217\u5411\u91cf\u53d8\u6362\u5230\u5de6\u8fb9\u77e9\u9635\u4e2d&#xff0c;\u6bcf\u4e00\u884c\u884c\u5411\u91cf\u4e3a\u57fa\u6240\u8868\u793a\u7684\u7a7a\u95f4\u4e2d\u53bb\u3002 <\/span><\/p>\n<p><span style=\"color:#000000\">2.\u62bd\u8c61\u5730\u8bf4&#xff0c;\u4e00\u4e2a\u77e9\u9635\u53ef\u4ee5\u8868\u793a\u4e00\u79cd\u7ebf\u6027\u53d8\u6362\u3002<\/span><\/p>\n<\/p>\n<h2 style=\"background-color:transparent\">PCA\u6267\u884c\u6b65\u9aa4\u603b\u7ed3<\/h2>\n<p><span style=\"color:#000000\">1. \u5c06\u539f\u59cb\u6570\u636e\u6309\u5217\u7ec4\u6210n\u884cm\u5217\u77e9\u9635X&#xff1b; <\/span><\/p>\n<p><span style=\"color:#000000\">2.\u5c06X\u7684\u6bcf\u4e00\u884c&#xff08;\u4ee3\u8868\u4e00\u4e2a\u5c5e\u6027\u5b57\u6bb5&#xff09;\u8fdb\u884c\u96f6\u5747\u503c\u5316&#xff0c; \u5373\u51cf\u53bb\u8fd9\u4e00\u884c\u7684\u5747\u503c <\/span><\/p>\n<p><span style=\"color:#000000\">3.\u6c42\u51fa\u534f\u65b9\u5dee\u77e9\u9635&#xff1a;<img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"50\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260116095727-696a0b87ec5b4.png\" width=\"104\" \/><\/span><\/p>\n<p><span style=\"color:#000000\">4.\u6c42\u51fa\u534f\u65b9\u5dee\u77e9\u9635\u7684\u7279\u5f81\u503c\u53ca\u5bf9\u5e94\u7684\u7279\u5f81\u5411\u91cf&#xff1b; <\/span><\/p>\n<p><span style=\"color:#000000\">5.\u5c06\u7279\u5f81\u5411\u91cf\u6309\u5bf9\u5e94\u7279\u5f81\u503c\u5927\u5c0f\u4ece\u4e0a\u5230\u4e0b\u6309\u884c\u6392\u5217 \u6210\u77e9\u9635&#xff0c;\u53d6\u524dk\u884c\u7ec4\u6210\u77e9\u9635P; <\/span><\/p>\n<p><span style=\"color:#000000\">6.Y&#061;PX\u5373\u4e3a\u964d\u7ef4\u5230k\u7ef4\u540e\u7684\u6570\u636e<\/span><\/p>\n<\/p>\n<h2>PCA\u4f18\u52a3\u52bf\u5206\u6790<\/h2>\n<h3>\u4f18\u70b9<\/h3>\n<p><span style=\"color:#000000\">1.\u8ba1\u7b97\u65b9\u6cd5\u7b80\u5355&#xff0c;\u5bb9\u6613\u5b9e\u73b0\u3002 <\/span><\/p>\n<p><span style=\"color:#000000\">2.\u53ef\u4ee5\u51cf\u5c11\u6307\u6807\u7b5b\u9009\u7684\u5de5\u4f5c\u91cf\u3002 <\/span><\/p>\n<p><span style=\"color:#000000\">3.\u6d88\u9664\u53d8\u91cf\u95f4\u7684\u591a\u91cd\u5171\u7ebf\u6027\u3002 <\/span><\/p>\n<p><span style=\"color:#000000\">4.\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u80fd\u51cf\u5c11\u566a\u58f0\u6570\u636e\u3002 <\/span><\/p>\n<\/p>\n<h3 style=\"background-color:transparent\">\u7f3a\u70b9<\/h3>\n<p><span style=\"color:#000000\">1.\u7279\u5f81\u5fc5\u987b\u662f\u8fde\u7eed\u578b\u53d8\u91cf\u3002 <\/span><\/p>\n<p><span style=\"color:#000000\">2.\u65e0\u6cd5\u89e3\u91ca\u964d\u7ef4\u540e\u7684\u6570\u636e\u662f\u4ec0\u4e48\u3002 <\/span><\/p>\n<p><span style=\"color:#000000\">3.\u8d21\u732e\u7387\u5c0f\u7684\u6210\u5206\u6709\u53ef\u80fd\u66f4\u91cd\u8981\u3002<\/span><\/p>\n<\/p>\n<h2>PCA \u7684\u4ee3\u7801\u5b9e\u73b0\u793a\u4f8b&#xff08;Python&#xff09;<\/h2>\n<p>\u4f7f\u7528 scikit-learn \u5b9e\u73b0 PCA \u7684\u5b8c\u6574\u6d41\u7a0b&#xff1a;<\/p>\n<p>import numpy as np<br \/>\nfrom sklearn.decomposition import PCA<br \/>\nfrom sklearn.preprocessing import StandardScaler<br \/>\nfrom sklearn.datasets import load_iris<br \/>\nimport matplotlib.pyplot as plt<\/p>\n<p># 1. \u52a0\u8f7d\u6570\u636e&#xff08;\u4ee5\u9e22\u5c3e\u82b1\u6570\u636e\u96c6\u4e3a\u4f8b&#xff09;<br \/>\ndata &#061; load_iris()<br \/>\nX &#061; data.data  # 4\u7ef4\u7279\u5f81<br \/>\ny &#061; data.target<\/p>\n<p># 2. \u6570\u636e\u9884\u5904\u7406<br \/>\nscaler &#061; StandardScaler()  # \u6807\u51c6\u5316&#xff08;\u53ef\u9009&#xff0c;\u6839\u636e\u6570\u636e\u51b3\u5b9a&#xff09;<br \/>\nX_scaled &#061; scaler.fit_transform(X)<\/p>\n<p># 3. \u6267\u884cPCA<br \/>\npca &#061; PCA()  # \u5148\u4fdd\u7559\u6240\u6709\u4e3b\u6210\u5206&#xff0c;\u67e5\u770b\u65b9\u5dee\u8d21\u732e\u7387<br \/>\nX_pca &#061; pca.fit_transform(X_scaled)<\/p>\n<p># 4. \u9009\u62e9\u6700\u4f73k\u503c&#xff08;\u7ed8\u5236\u7d2f\u8ba1\u65b9\u5dee\u8d21\u732e\u7387&#xff09;<br \/>\nexplained_variance &#061; pca.explained_variance_ratio_<br \/>\ncumulative_variance &#061; np.cumsum(explained_variance)<\/p>\n<p>plt.plot(range(1, len(cumulative_variance)&#043;1), cumulative_variance, &#039;o-&#039;)<br \/>\nplt.xlabel(&#039;\u4e3b\u6210\u5206\u6570\u91cf&#039;)<br \/>\nplt.ylabel(&#039;\u7d2f\u8ba1\u65b9\u5dee\u8d21\u732e\u7387&#039;)<br \/>\nplt.axhline(y&#061;0.95, color&#061;&#039;r&#039;, linestyle&#061;&#039;&#8211;&#039;)  # 95%\u9608\u503c\u7ebf<br \/>\nplt.show()<\/p>\n<p># 5. \u7528\u9009\u5b9a\u7684k\u503c\u91cd\u65b0\u964d\u7ef4&#xff08;\u4f8b\u5982k&#061;2&#xff09;<br \/>\npca &#061; PCA(n_components&#061;2)<br \/>\nX_pca &#061; pca.fit_transform(X_scaled)<\/p>\n<p># 6. \u53ef\u89c6\u5316\u964d\u7ef4\u7ed3\u679c<br \/>\nplt.scatter(X_pca[:, 0], X_pca[:, 1], c&#061;y, cmap&#061;&#039;viridis&#039;)<br \/>\nplt.xlabel(&#039;\u4e3b\u6210\u52061&#039;)<br \/>\nplt.ylabel(&#039;\u4e3b\u6210\u52062&#039;)<br \/>\nplt.title(&#039;PCA\u964d\u7ef4\u540e\u7684\u6570\u636e\u5206\u5e03&#039;)<br \/>\nplt.show()<br \/>\n# \u603b\u7ed3<\/p>\n<p>PCA \u7684\u6838\u5fc3\u662f\u901a\u8fc7\u7ebf\u6027\u53d8\u6362\u5c06\u9ad8\u7ef4\u6570\u636e\u6620\u5c04\u5230\u4f4e\u7ef4\u7a7a\u95f4&#xff0c;\u5176\u6570\u5b66\u672c\u8d28\u662f\u5bf9\u534f\u65b9\u5dee\u77e9\u9635\u7684\u7279\u5f81\u5206\u89e3&#xff08;\u6216\u6570\u636e\u77e9\u9635\u7684 SVD \u5206\u89e3&#xff09;\u3002\u5b9e\u9645\u5e94\u7528\u4e2d\u9700\u6ce8\u610f&#xff1a;<br \/>\n&#8211; \u5fc5\u987b\u8fdb\u884c\u5747\u503c\u4e2d\u5fc3\u5316&#xff0c;\u6807\u51c6\u5316\u89c6\u573a\u666f\u9009\u62e9<br \/>\n&#8211; \u4e3b\u6210\u5206\u6570\u91cf \\\\( k \\\\) \u9700\u901a\u8fc7\u7d2f\u8ba1\u65b9\u5dee\u8d21\u732e\u7387\u7b49\u65b9\u6cd5\u5408\u7406\u9009\u62e9<br \/>\n&#8211; \u5bf9\u5f02\u5e38\u503c\u654f\u611f&#xff0c;\u9700\u9884\u5904\u7406<br \/>\n&#8211; \u7ebf\u6027\u7ed3\u6784\u9002\u7528&#xff0c;\u975e\u7ebf\u6027\u6570\u636e\u53ef\u8003\u8651\u6838 PCA  <\/p>\n<p>\u6df1\u5165\u7406\u89e3 PCA \u4e0d\u4ec5\u80fd\u66f4\u597d\u5730\u5e94\u7528\u4e8e\u6570\u636e\u964d\u7ef4&#xff0c;\u8fd8\u80fd\u5e2e\u52a9\u7406\u89e3\u5176\u4ed6\u964d\u7ef4\u65b9\u6cd5&#xff08;\u5982 t-SNE\u3001LDA&#xff09;\u7684\u8bbe\u8ba1\u601d\u8def&#xff0c;\u4e3a\u590d\u6742\u6570\u636e\u5206\u6790\u4efb\u52a1\u63d0\u4f9b\u57fa\u7840\u5de5\u5177\u3002<\/p>\n<p style=\"margin-left:.0001pt;margin-right:0;text-align:justify\">\n","protected":false},"excerpt":{"rendered":"<p>\u4e3b\u6210\u5206\u5206\u6790&#xff08;PCA&#xff09;\u4ec0\u4e48\u662f\u4e3b\u6210\u5206\u5206\u6790PCA&#xff0c;\u5168\u79f0\u4e3b\u6210\u5206\u5206\u6790&#xff0c;\u672c\u8d28\u4e0a\u662f\u4e00\u79cd\u6570\u636e\u538b\u7f29\u6280\u672f\u3002\u662f\u4e00\u79cd\u901a\u7528\u7684\u964d\u7ef4\u5de5\u5177\u5b83\u7684\u6838\u5fc3\u76ee\u6807\u7684\u662f\u5728\u51cf\u5c11\u6570\u636e\u7ef4\u5ea6\u7684\u540c\u65f6&#xff0c;\u5c3d\u53ef\u80fd\u4fdd\u7559\u539f\u59cb\u6570\u636e\u7684\u5173\u952e\u4fe1\u606f\u3002\u4e3e\u4e2a\u76f4\u89c2\u7684\u4f8b\u5b50&#xff1a;\u6211\u4eec\u8981\u5206\u6790\u4e00\u6279\u82b1\u6735\u6570\u636e&#xff0c;\u539f\u59cb\u6570\u636e\u5305\u542b\u843c\u7247\u957f\u3001\u843c\u7247\u5bbd\u3001\u82b1\u74e3\u957f\u3001\u82b1\u74e3\u5bbd\u56db\u4e2a\u7279\u5f81\u3002\u901a\u8fc7PCA\u5904\u7406\u540e&#xff0c;\u53ef\u80fd\u53ea\u9700\u8981\u4e24\u4e2a\u4e3b\u6210\u5206\u5c31\u80fd\u89e3\u91ca\u539f\u59cb\u6570\u636e90%\u4ee5\u4e0a\u7684\u4fe1\u606f\u3002\u8fd9\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u629b\u5f03\u539f\u6765\u7684\u56db\u4e2a<\/p>\n","protected":false},"author":2,"featured_media":60953,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[50,207],"topic":[],"class_list":["post-60955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-50","tag-207"],"yoast_head":"<!-- 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content=\"\u4e3b\u6210\u5206\u5206\u6790&#xff08;PCA&#xff09;\u4ec0\u4e48\u662f\u4e3b\u6210\u5206\u5206\u6790PCA&#xff0c;\u5168\u79f0\u4e3b\u6210\u5206\u5206\u6790&#xff0c;\u672c\u8d28\u4e0a\u662f\u4e00\u79cd\u6570\u636e\u538b\u7f29\u6280\u672f\u3002\u662f\u4e00\u79cd\u901a\u7528\u7684\u964d\u7ef4\u5de5\u5177\u5b83\u7684\u6838\u5fc3\u76ee\u6807\u7684\u662f\u5728\u51cf\u5c11\u6570\u636e\u7ef4\u5ea6\u7684\u540c\u65f6&#xff0c;\u5c3d\u53ef\u80fd\u4fdd\u7559\u539f\u59cb\u6570\u636e\u7684\u5173\u952e\u4fe1\u606f\u3002\u4e3e\u4e2a\u76f4\u89c2\u7684\u4f8b\u5b50&#xff1a;\u6211\u4eec\u8981\u5206\u6790\u4e00\u6279\u82b1\u6735\u6570\u636e&#xff0c;\u539f\u59cb\u6570\u636e\u5305\u542b\u843c\u7247\u957f\u3001\u843c\u7247\u5bbd\u3001\u82b1\u74e3\u957f\u3001\u82b1\u74e3\u5bbd\u56db\u4e2a\u7279\u5f81\u3002\u901a\u8fc7PCA\u5904\u7406\u540e&#xff0c;\u53ef\u80fd\u53ea\u9700\u8981\u4e24\u4e2a\u4e3b\u6210\u5206\u5c31\u80fd\u89e3\u91ca\u539f\u59cb\u6570\u636e90%\u4ee5\u4e0a\u7684\u4fe1\u606f\u3002\u8fd9\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u629b\u5f03\u539f\u6765\u7684\u56db\u4e2a\" 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