{"id":4484,"date":"2025-10-22T14:56:43","date_gmt":"2025-10-22T05:56:43","guid":{"rendered":"https:\/\/bdsl.jbnu.ac.kr\/blog\/?p=4484"},"modified":"2025-10-22T15:02:15","modified_gmt":"2025-10-22T06:02:15","slug":"example-machine-learning-2","status":"publish","type":"post","link":"https:\/\/bdsl.jbnu.ac.kr\/blog\/example-machine-learning-2\/","title":{"rendered":"Example &#8211; machine learning"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>Linear Regression<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Load libraries<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\">import matplotlib.pyplot as plt\nimport numpy as np\nfrom sklearn import datasets, linear_model\nfrom sklearn.metrics import mean_squared_error, r2_score<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Load data <\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\"># Load the diabetes dataset\ndiabetes_X, diabetes_y = datasets.load_diabetes(return_X_y=True)\n\n# Use only one feature\ndiabetes_X = diabetes_X[:, np.newaxis, 2]<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Divide datasets into training and testing sets<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\"># Split the data into training\/testing sets\ndiabetes_X_train = diabetes_X[:-20]\ndiabetes_X_test = diabetes_X[-20:]\n\n# Split the targets into training\/testing sets\ndiabetes_y_train = diabetes_y[:-20]\ndiabetes_y_test = diabetes_y[-20:]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Generate a model <\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\"># Generate a model \nregr = linear_model.LinearRegression()<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Machine learning (training): seek for the optimal parameters<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\"># Train the model using the training sets\nregr.fit(diabetes_X_train, diabetes_y_train)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Make predictions <\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\"># Make predictions using the testing set\ndiabetes_y_pred = regr.predict(diabetes_X_test)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Analyze models <\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\"># The coefficients\nprint(\"Coefficients: \\n\", regr.coef_)\n\n# The mean squared error\nprint(\"Mean squared error: %.2f\" % mean_squared_error(diabetes_y_test, diabetes_y_pred))\n\n# The coefficient of determination: 1 is perfect prediction\nprint(\"Coefficient of determination: %.2f\" % r2_score(diabetes_y_test, diabetes_y_pred))\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Visualize the results<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\"># Plot outputs\nplt.scatter(diabetes_X_test, diabetes_y_test, color=\"black\")\nplt.plot(diabetes_X_test, diabetes_y_pred, color=\"blue\", linewidth=3)\nplt.xticks(())\nplt.yticks(())\nplt.show()<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Linear Regression Load libraries Load data Divide datasets into training and testing sets Generate a model Machine learning (training): seek for the optimal parameters Make predictions Analyze models Visualize the results<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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