{"id":2559,"date":"2022-08-23T15:20:07","date_gmt":"2022-08-23T07:20:07","guid":{"rendered":"http:\/\/cnliutz.uicp.io\/?p=2559"},"modified":"2022-08-23T15:20:07","modified_gmt":"2022-08-23T07:20:07","slug":"%e7%bb%98%e5%88%b6%e7%9b%b4%e6%96%b9%e5%9b%be%e3%80%81%e9%9a%8f%e6%9c%ba%e6%8a%bd%e6%a0%b7%e3%80%81%e4%b8%bb%e6%88%90%e5%88%86%e5%88%86%e6%9e%90pca","status":"publish","type":"post","link":"http:\/\/nr0jgk4d.ipyingshe.net:5347\/?p=2559","title":{"rendered":"\u7ed8\u5236\u76f4\u65b9\u56fe\u3001\u968f\u673a\u62bd\u6837\u3001\u4e3b\u6210\u5206\u5206\u6790PCA"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code># -*- coding: utf-8 -*-\n\"\"\"\nCreated on Tue Aug 23 13:55:48 2022\n\n@author: cnliutz\n\"\"\"\n# #\u7ed8\u5236\u76f4\u65b9\u56fe\nimport numpy as np\ndata = np.random.normal(1,10,500)\nimport matplotlib.pyplot as plt\nplt.hist(data)\n\n#\u968f\u673a\u62bd\u6837\n# from sklearn import datasets\nimport pandas as pd\niris = datasets.load_iris()\niris_df = pd.DataFrame(iris.data)\niris_df.columns = iris.feature_names\nprint(iris_df.sample(10))\n\n#PCA\u4e3b\u6210\u5206\u5206\u6790\nfrom sklearn.datasets import fetch_california_housing\nhousing = fetch_california_housing()   #\u8c03\u7528\u6570\u636e\u96c6\ny = pd.DataFrame(housing.data)         #\u8f6c\u6362\u4e3a\u6570\u636e\u6846\nfrom sklearn.decomposition import PCA  #\u8c03\u7528PCA\u4e3b\u6210\u5206\u5206\u6790\u7a0b\u5e8f\npca = PCA(n_components=5)              #\u9009\u53d65\u4e2a\u4e3b\u6210\u5206\npca.fit(y)                             #\u5206\u6790\u8ba1\u7b97 \nprint(pca.explained_variance_ratio_) #\u4e3b\u6210\u5206\u65b9\u5dee\nprint(pca.explained_variance_ratio_.sum()) #\u4e3b\u6210\u5206\u65b9\u5dee\u5408\u8ba1\uff0c\u4ee3\u8868\u4e3b\u6210\u5206\u80fd\u4ee3\u8868\u7684\u4e0e\u6570\u636e\u7684\u4fe1\u606f\uff0c\u672c\u4f8b\u4e3a0.9999974631075885\uff0c\u537399%\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,10],"tags":[],"class_list":["post-2559","post","type-post","status-publish","format-standard","hentry","category-2","category-python"],"_links":{"self":[{"href":"http:\/\/nr0jgk4d.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts\/2559","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/nr0jgk4d.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/nr0jgk4d.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/nr0jgk4d.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/nr0jgk4d.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2559"}],"version-history":[{"count":0,"href":"http:\/\/nr0jgk4d.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts\/2559\/revisions"}],"wp:attachment":[{"href":"http:\/\/nr0jgk4d.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2559"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/nr0jgk4d.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2559"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/nr0jgk4d.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2559"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}