{"id":3112,"date":"2022-02-27T11:41:43","date_gmt":"2022-02-27T03:41:43","guid":{"rendered":"https:\/\/egonlin.com\/?p=3112"},"modified":"2022-02-27T11:43:34","modified_gmt":"2022-02-27T03:43:34","slug":"%e7%ac%ac%e4%ba%94%e8%8a%82%ef%bc%9a%e9%9d%9e%e7%ba%bf%e6%80%a7%e6%94%af%e6%8c%81%e5%90%91%e9%87%8f%e6%9c%ba%e9%b8%a2%e5%b0%be%e8%8a%b1%e5%88%86%e7%b1%bb%e8%87%aa%e5%ae%9a%e4%b9%89%e9%9a%8f","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=3112","title":{"rendered":"\u7b2c\u4e94\u8282\uff1a\u975e\u7ebf\u6027\u652f\u6301\u5411\u91cf\u673a(\u9e22\u5c3e\u82b1\u5206\u7c7b)+\u81ea\u5b9a\u4e49\u968f\u673a\u6570\u636e"},"content":{"rendered":"

\u975e\u7ebf\u6027\u652f\u6301\u5411\u91cf\u673a(\u9e22\u5c3e\u82b1\u5206\u7c7b)+\u81ea\u5b9a\u4e49\u968f\u673a\u6570\u636e<\/h1>\n

\u5bfc\u5165\u6a21\u5757<\/h1>\n
import numpy as np\nimport pandas as pd\nimport matplotlib.pyplot as plt\nfrom matplotlib.colors import ListedColormap\nfrom matplotlib.font_manager import FontProperties\nfrom sklearn import datasets\nfrom sklearn.svm import SVC\n%matplotlib inline\nfont = FontProperties(fname='\/Library\/Fonts\/Heiti.ttc')<\/code><\/pre>\n
\u81ea\u5b9a\u4e49\u6570\u636e\u5206\u7c7b<\/h1>\n
\u81ea\u5b9a\u4e49\u6570\u636e<\/h2>\n
# \u4fdd\u8bc1\u968f\u673a\u6570\u4e0d\u91cd\u590d\nnp.random.seed(1)\n# \u521b\u5efa100\u4e2a\u4e8c\u7ef4\u6570\u7ec4\uff0c\u5373100\u4e2a2\u4e2a\u7279\u5f81\u7684\u6837\u672c\nX_custom = np.random.randn(100, 2)\n# np.logical_xor(bool1, bool2)\uff0c\u5f02\u6216\u903b\u8f91\u8fd0\u7b97\uff0c\u5982\u679cbool1\u548cbool2\u7684\u7ed3\u679c\u76f8\u540c\u5219\u4e3aFalse\uff0c\u5426\u5219\u4e3aTrue\n# ++\u548c--\u4e3a\u4e00\u4e09\u8c61\u9650\uff0c+-\u548c-+\u4e3a\u4e8c\u56db\u8c61\u9650\uff0c\u5982\u6b64\u505a\u5219100\u4e2a\u6837\u672c\u5fc5\u5b9a\u7ebf\u6027\u4e0d\u53ef\u5206\ny_custom = np.logical_xor(X_custom[:, 0] > 0, X_custom[:, 1] > 0)\n# \u4e8c\u56db\u8c61\u9650\u4e3aTrue\uff0c\u5373\u4e3a1\u7c7b\uff1b\u4e00\u4e09\u8c61\u9650\u4e3aFalse\uff0c\u5373\u4e3a-1\u7c7b\ny_custom = np.where(y_custom, 1, -1)<\/code><\/pre>\n
\u6784\u5efa\u51b3\u7b56\u8fb9\u754c<\/h2>\n
def plot_decision_regions(X, y, classifier=None):\n    marker_list = ['o', 'x', 's']\n    color_list = ['r', 'b', 'g']\n    cmap = ListedColormap(color_list[:len(np.unique(y))])\n\n    x1_min, x1_max = X[:, 0].min()-1, X[:, 0].max()+1\n    x2_min, x2_max = X[:, 1].min()-1, X[:, 1].max()+1\n    t1 = np.linspace(x1_min, x1_max, 666)\n    t2 = np.linspace(x2_min, x2_max, 666)\n\n    x1, x2 = np.meshgrid(t1, t2)\n    y_hat = classifier.predict(np.array([x1.ravel(), x2.ravel()]).T)\n    y_hat = y_hat.reshape(x1.shape)\n    plt.contourf(x1, x2, y_hat, alpha=0.2, cmap=cmap)\n    plt.xlim(x1_min, x1_max)\n    plt.ylim(x2_min, x2_max)\n\n    for ind, clas in enumerate(np.unique(y)):\n        plt.scatter(X[y == clas, 0], X[y == clas, 1], alpha=0.8, s=50,\n                    c=color_list[ind], marker=marker_list[ind], label=clas)<\/code><\/pre>\n
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\u8054\u7cfb\u7ba1\u7406\u5458\u5fae\u4fe1tutu19192010\uff0c\u6ce8\u518c\u8d26\u53f7<\/p>\n<\/div>
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\u975e\u7ebf\u6027\u652f\u6301\u5411\u91cf\u673a(\u9e22\u5c3e\u82b1\u5206\u7c7b)+\u81ea\u5b9a\u4e49\u968f\u673a\u6570\u636e \u5bfc\u5165\u6a21\u5757 import numpy as np import  […]<\/p>\n","protected":false},"author":3,"featured_media":3094,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[276,291],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/3112"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3112"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/3112\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/3094"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3112"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3112"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3112"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}