{"id":4757,"date":"2024-09-03T07:58:58","date_gmt":"2024-09-02T23:58:58","guid":{"rendered":"http:\/\/cnliutz.ipyingshe.net\/?p=4757"},"modified":"2024-09-03T22:16:14","modified_gmt":"2024-09-03T14:16:14","slug":"python%e6%a3%80%e6%b5%8b%e6%95%b0%e6%8d%ae%e4%b8%ad%e7%9a%84%e5%bc%82%e5%b8%b8%e5%80%bc","status":"publish","type":"post","link":"http:\/\/qbtobjow.ipyingshe.net:5347\/?p=4757","title":{"rendered":"Python\u68c0\u6d4b\u6570\u636e\u4e2d\u7684\u5f02\u5e38\u503c"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>import pandas as pd\nimport numpy as np\nfrom sklearn.preprocessing import StandardScaler\nfrom sklearn.ensemble import IsolationForest\nimport matplotlib.pyplot as plt\n\n# \u521b\u5efa\u865a\u62df\u6570\u636e\u96c6\nnp.random.seed(42)\ndata = {\n    'feature1': np.random.normal(0, 1, 1000),\n    'feature2': np.random.normal(0, 1, 1000)\n}\n\n# \u6dfb\u52a0\u4e00\u4e9b\u5f02\u5e38\u503c\ndata&#91;'feature1']&#91;np.random.randint(0, 1000, 50)] = np.random.uniform(10, 20, 50)\ndata&#91;'feature2']&#91;np.random.randint(0, 1000, 50)] = np.random.uniform(10, 20, 50)\n\ndf = pd.DataFrame(data)\n\n# \u6807\u51c6\u5316\u6570\u636e\nscaler = StandardScaler()\ndf_scaled = scaler.fit_transform(df)\n\n# \u6784\u5efa\u6a21\u578b\nmodel = IsolationForest(contamination=0.05)\nmodel.fit(df_scaled)\n\n# \u68c0\u6d4b\u5f02\u5e38\u503c\ndf&#91;'anomaly'] = model.predict(df_scaled)\ndf&#91;'anomaly'] = df&#91;'anomaly'].map({1: 0, -1: 1})  # 1\u8868\u793a\u6b63\u5e38\u503c\uff0c-1\u8868\u793a\u5f02\u5e38\u503c\n\n# \u53ef\u89c6\u5316\u7ed3\u679c\nplt.scatter(df&#91;'feature1'], df&#91;'feature2'], c=df&#91;'anomaly'], cmap='coolwarm')\nplt.xlabel('Feature 1')\nplt.ylabel('Feature 2')\nplt.title('Anomaly Detection')\nplt.show()<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"964\" height=\"817\" src=\"http:\/\/cnliutz.ipyingshe.net\/wp-content\/uploads\/2024\/09\/\u5c4f\u5e55\u622a\u56fe-2024-09-03-221349.png\" alt=\"\" class=\"wp-image-4775\" srcset=\"http:\/\/qbtobjow.ipyingshe.net:5347\/wp-content\/uploads\/2024\/09\/\u5c4f\u5e55\u622a\u56fe-2024-09-03-221349.png 964w, http:\/\/qbtobjow.ipyingshe.net:5347\/wp-content\/uploads\/2024\/09\/\u5c4f\u5e55\u622a\u56fe-2024-09-03-221349-300x254.png 300w, http:\/\/qbtobjow.ipyingshe.net:5347\/wp-content\/uploads\/2024\/09\/\u5c4f\u5e55\u622a\u56fe-2024-09-03-221349-768x651.png 768w\" sizes=\"auto, (max-width: 964px) 100vw, 964px\" \/><\/figure>\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],"tags":[],"class_list":["post-4757","post","type-post","status-publish","format-standard","hentry","category-2"],"_links":{"self":[{"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts\/4757","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4757"}],"version-history":[{"count":2,"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts\/4757\/revisions"}],"predecessor-version":[{"id":4776,"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts\/4757\/revisions\/4776"}],"wp:attachment":[{"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4757"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4757"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4757"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}