{"id":29920,"date":"2024-10-28T03:18:40","date_gmt":"2024-10-28T03:18:40","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=29920"},"modified":"2024-11-26T06:50:50","modified_gmt":"2024-11-26T06:50:50","slug":"%eb%94%a5%eb%9f%ac%eb%8b%9d-%ed%8c%8c%ec%9d%b4%ed%86%a0%ec%b9%98-%ea%b0%95%ec%a2%8c-k-%ed%8f%89%ea%b7%a0-%ea%b5%b0%ec%a7%91%ed%99%94","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/29920\/","title":{"rendered":"\ub525\ub7ec\ub2dd \ud30c\uc774\ud1a0\uce58 \uac15\uc88c, K-\ud3c9\uade0 \uad70\uc9d1\ud654"},"content":{"rendered":"<div class=\"post\">\n<p>\ub525\ub7ec\ub2dd\uacfc \uba38\uc2e0\ub7ec\ub2dd\uc758 \ubc1c\uc804\uc73c\ub85c \uc778\ud574 \ub370\uc774\ud130 \ubd84\uc11d\uc758 \uc811\uadfc \ubc29\uc2dd\uc774 \ud06c\uac8c \ubcc0\ud654\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uadf8 \uc911 \ud558\ub098\uac00 \uad70\uc9d1\ud654(clusterization) \uae30\uc220\uc785\ub2c8\ub2e4. \ubcf8 \ud3ec\uc2a4\ud2b8\uc5d0\uc11c\ub294 \uae4a\uc774 \uc788\ub294 K-\ud3c9\uade0 \uad70\uc9d1\ud654 \uc54c\uace0\ub9ac\uc998\uc744 \ud30c\uc774\ud1a0\uce58(Pytorch)\ub85c \uad6c\ud604\ud558\uc5ec \ub370\uc774\ud130 \ubd84\uc11d\uc5d0 \ud65c\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4.<\/p>\n<h2>1. K-\ud3c9\uade0 \uad70\uc9d1\ud654\ub780?<\/h2>\n<p>K-\ud3c9\uade0 \uad70\uc9d1\ud654\ub294 \ube44\uc9c0\ub3c4 \ud559\uc2b5(non-supervised learning) \uc54c\uace0\ub9ac\uc998 \uc911 \ud558\ub098\ub85c, \uc8fc\uc5b4\uc9c4 \ub370\uc774\ud130 \ud3ec\uc778\ud2b8\ub97c K\uac1c\uc758 \ud074\ub7ec\uc2a4\ud130\ub85c \ub098\ub204\ub294 \ubc29\ubc95\uc785\ub2c8\ub2e4. \uc774 \uc54c\uace0\ub9ac\uc998\uc758 \ubaa9\uc801\uc740 \uac01 \ud074\ub7ec\uc2a4\ud130\uc758 \uc911\uc2ec (centroid)\uacfc \ub370\uc774\ud130 \ud3ec\uc778\ud2b8 \uac04\uc758 \ud3c9\uade0 \uac70\ub9ac\ub97c \ucd5c\uc18c\ud654\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \uc774\ub294 \ud074\ub7ec\uc2a4\ud130 \ub0b4\uc758 \ub370\uc774\ud130 \ud3ec\uc778\ud2b8\ub4e4\uc774 \uc11c\ub85c \uac00\uae5d\uace0, \ud074\ub7ec\uc2a4\ud130 \uac04 \uac70\ub9ac\uac00 \uba40\ub3c4\ub85d \uacb0\uacfc\ub97c \ub3c4\ucd9c\ud558\ub294 \uac83\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.<\/p>\n<h2>2. K-\ud3c9\uade0 \uad70\uc9d1\ud654\uc758 \uc791\ub3d9 \uc6d0\ub9ac<\/h2>\n<ol>\n<li><strong>\ucd08\uae30\ud654:<\/strong> K\uac1c\uc758 \ud074\ub7ec\uc2a4\ud130 \uc911\uc2ec\uc744 \ubb34\uc791\uc704\ub85c \uc120\ud0dd\ud569\ub2c8\ub2e4.<\/li>\n<li><strong>\ud560\ub2f9 \ub2e8\uacc4:<\/strong> \uac01 \ub370\uc774\ud130 \ud3ec\uc778\ud2b8\ub97c \uac00\uc7a5 \uac00\uae4c\uc6b4 \ud074\ub7ec\uc2a4\ud130 \uc911\uc2ec\uc73c\ub85c \ud560\ub2f9\ud569\ub2c8\ub2e4.<\/li>\n<li><strong>\uc5c5\ub370\uc774\ud2b8 \ub2e8\uacc4:<\/strong> \uac01 \ud074\ub7ec\uc2a4\ud130\uc758 \uc911\uc2ec\uc744 \ud574\ub2f9 \ud074\ub7ec\uc2a4\ud130\uc5d0 \uc18d\ud55c \ub370\uc774\ud130 \ud3ec\uc778\ud2b8\ub4e4\uc758 \ud3c9\uade0\uc73c\ub85c \uc5c5\ub370\uc774\ud2b8\ud569\ub2c8\ub2e4.<\/li>\n<li><strong>\uc218\ub834 \ud655\uc778:<\/strong> \ud074\ub7ec\uc2a4\ud130 \uc911\uc2ec\uc758 \ubcc0\ud654\uac00 \uc5c6\uac70\ub098 \ubbf8\ubbf8\ud55c \uacbd\uc6b0 \uc54c\uace0\ub9ac\uc998\uc744 \uc885\ub8cc\ud569\ub2c8\ub2e4.<\/li>\n<\/ol>\n<p>\uc774 \uacfc\uc815\uc744 \ubc18\ubcf5\ud558\uc5ec \ucd5c\uc801\uc758 \ud074\ub7ec\uc2a4\ud130\ub97c \ucc3e\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>3. K-\ud3c9\uade0 \uad70\uc9d1\ud654\uc758 \uc7a5\uc810\uacfc \ub2e8\uc810<\/h2>\n<h3>\uc7a5\uc810<\/h3>\n<ul>\n<li>\uad6c\ud604\uacfc \uc774\ud574\uac00 \uac04\ub2e8\ud558\ub2e4.<\/li>\n<li>\ud6a8\uc728\uc801\uc774\uba70 \ube60\ub978 \uc218\ub834 \uc18d\ub3c4\ub97c \uac00\uc9c4\ub2e4.<\/li>\n<\/ul>\n<h3>\ub2e8\uc810<\/h3>\n<ul>\n<li>K \uac12(\ud074\ub7ec\uc2a4\ud130\uc758 \uc218)\uc744 \ubbf8\ub9ac \uc9c0\uc815\ud574\uc57c \ud55c\ub2e4.<\/li>\n<li>\ube44\uad6c\ud615 \ud074\ub7ec\uc2a4\ud130\uc5d0 \ub300\ud574\uc11c\ub294 \uc798 \uc791\ub3d9\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/li>\n<li>\uc544\uc6c3\ub77c\uc774\uc5b4(outlier)\uc5d0 \ubbfc\uac10\ud560 \uc218 \uc788\ub2e4.<\/li>\n<\/ul>\n<h2>4. K-\ud3c9\uade0 \uad70\uc9d1\ud654\uc758 \ud30c\uc774\ud1a0\uce58 \uad6c\ud604<\/h2>\n<p>\uc774\uc81c K-\ud3c9\uade0 \uad70\uc9d1\ud654\ub97c \ud30c\uc774\ud1a0\uce58\ub85c \uad6c\ud604\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc774 \uc608\uc81c\uc5d0\uc11c\ub294 2\ucc28\uc6d0 \ub370\uc774\ud130\ub97c \uc0dd\uc131\ud558\uc5ec \uad70\uc9d1\ud654\ub97c \uc218\ud589\ud560 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<h3>4.1. \ud544\uc694\ud55c \ub77c\uc774\ube0c\ub7ec\ub9ac \uc124\uce58<\/h3>\n<p>\uba3c\uc800 \ud544\uc694\ud55c \ub77c\uc774\ube0c\ub7ec\ub9ac\ub97c \uc124\uce58\ud558\uace0 \uc784\ud3ec\ud2b8\ud569\ub2c8\ub2e4.<\/p>\n<pre><code>python\nimport torch\nimport numpy as np\nimport matplotlib.pyplot as plt\n    <\/code><\/pre>\n<h3>4.2. \ub370\uc774\ud130 \uc0dd\uc131<\/h3>\n<p>\uc784\uc758\uc758 2D \ub370\uc774\ud130\ub97c \uc0dd\uc131\ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<pre><code>python\n# \ub370\uc774\ud130 \uc0dd\uc131\nnp.random.seed(42)\nnum_samples_per_cluster = 100\nC1 = np.random.randn(num_samples_per_cluster, 2) + np.array([0, 0])\nC2 = np.random.randn(num_samples_per_cluster, 2) + np.array([5, 5])\nC3 = np.random.randn(num_samples_per_cluster, 2) + np.array([1, 8])\n\ndata = np.vstack((C1, C2, C3))\nplt.scatter(data[:, 0], data[:, 1])\nplt.title(\"Generated Data\")\nplt.show()\n    <\/code><\/pre>\n<h3>4.3. K-\ud3c9\uade0 \uc54c\uace0\ub9ac\uc998 \uad6c\ud604<\/h3>\n<p>\uc774\uc81c K-\ud3c9\uade0 \uc54c\uace0\ub9ac\uc998\uc744 \uad6c\ud604\ud569\ub2c8\ub2e4.<\/p>\n<pre><code>python\n# K-Mean \uad6c\ud604\ndef k_means(X, k, num_iters=100):\n    # \uac01 \ud074\ub7ec\uc2a4\ud130 \uc911\uc2ec\uc758 \ucd08\uae30\ud654\n    centroids = X[np.random.choice(X.shape[0], k, replace=False)]\n    \n    for _ in range(num_iters):\n        # \uac01 \ub370\uc774\ud130 \ud3ec\uc778\ud2b8\ub97c \uac00\uc7a5 \uac00\uae4c\uc6b4 \uc911\uc2ec\uc5d0 \ud560\ub2f9\n        distances = torch.cdist(torch.tensor(X, dtype=torch.float32), torch.tensor(centroids, dtype=torch.float32))\n        labels = torch.argmin(distances, dim=1)\n\n        # \uc0c8\ub85c\uc6b4 \uc911\uc2ec \uacc4\uc0b0\n        new_centroids = torch.zeros_like(centroids)\n        for i in range(k):\n            if torch.any(labels == i):\n                new_centroids[i, :] = X[labels.numpy() == i].mean(axis=0)\n        \n        centroids = new_centroids\n\n    return labels.numpy(), centroids.numpy()\n    <\/code><\/pre>\n<h3>4.4. \uc54c\uace0\ub9ac\uc998 \uc2e4\ud589<\/h3>\n<p>K-\ud3c9\uade0 \uad70\uc9d1\ud654\ub97c \uc218\ud589\ud558\uace0 \uacb0\uacfc\ub97c \uc2dc\uac01\ud654\ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<pre><code>python\n# K-\ud3c9\uade0 \uc2e4\ud589\nk = 3\nlabels, centroids = k_means(data, k)\n\n# \uacb0\uacfc \uc2dc\uac01\ud654\nplt.scatter(data[:, 0], data[:, 1], c=labels, cmap='viridis')\nplt.scatter(centroids[:, 0], centroids[:, 1], s=200, c='red', marker='X')  # centroid \ud45c\uc2dc\nplt.title(\"K-Means Clustering\")\nplt.show()\n    <\/code><\/pre>\n<h2>5. K-\ud3c9\uade0 \uad70\uc9d1\ud654\uc758 \ud65c\uc6a9<\/h2>\n<p>K-\ud3c9\uade0 \uad70\uc9d1\ud654\ub294 \uace0\uac1d \uc138\ubd84\ud654, \uc774\ubbf8\uc9c0 \uc555\ucd95, \ucd94\ucc9c \uc2dc\uc2a4\ud15c \ub4f1 \ub2e4\uc591\ud55c \ubd84\uc57c\uc5d0\uc11c \ud65c\uc6a9\ub418\uace0 \uc788\uc2b5\ub2c8\ub2e4. \ub610\ud55c, \ub370\uc774\ud130 \ubd84\uc11d\uac00\ub4e4\uc774 \ub370\uc774\ud130\uc758 \uad6c\uc870\ub97c \uc774\ud574\ud558\uace0, \ud328\ud134\uc744 \ubc1c\uacac\ud558\ub294 \ub370 \uc720\uc6a9\ud55c \ub3c4\uad6c\uac00 \ub429\ub2c8\ub2e4.<\/p>\n<h2>6. \uacb0\ub860<\/h2>\n<p>K-\ud3c9\uade0 \uad70\uc9d1\ud654\ub294 \uc774\ud574\ud558\uae30 \uc27d\uace0, \uc801\uc808\ud55c \ub370\uc774\ud130\uc5d0 \ub300\ud574 \uac15\ub825\ud55c \uc131\ub2a5\uc744 \ub098\ud0c0\ub0b4\ub294 \uad70\uc9d1\ud654 \uc54c\uace0\ub9ac\uc998\uc785\ub2c8\ub2e4. \ud30c\uc774\ud1a0\uce58\ub97c \uc0ac\uc6a9\ud558\uc5ec \uad6c\ud604\ud568\uc73c\ub85c\uc368 \uace0\uae09 \ub525\ub7ec\ub2dd \ubc0f \uba38\uc2e0\ub7ec\ub2dd\uc758 \uae30\ucd08\ub97c \uc2b5\ub4dd\ud560 \uc218 \uc788\uc5c8\uc2b5\ub2c8\ub2e4. \ubcf8 \uac15\uc88c\ub97c \ud1b5\ud574 \ub370\uc774\ud130 \uad70\uc9d1\ud654 \uac1c\ub150\uc744 \uc774\ud574\ud558\uace0, \ud30c\uc774\ud1a0\uce58\uc758 \uad6c\uc870\ub97c \uc775\ud788\ub294 \ub370 \ub3c4\uc6c0\uc774 \ub418\uae38 \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n<p>\ubaa8\ub4e0 \ucf54\ub4dc\uc640 \uc608\uc2dc\ub97c \ud1b5\ud574 \ub525\ub7ec\ub2dd\uc758 \uc7ac\ubbf8\uc640 \uac00\ub2a5\uc131\uc744 \ub290\ub084 \uc218 \uc788\uc5c8\uae30\ub97c \ubc14\ub78d\ub2c8\ub2e4. \uc55e\uc73c\ub85c\ub3c4 \ub370\uc774\ud130 \ubd84\uc11d, \ub525\ub7ec\ub2dd\uc5d0 \ub300\ud55c \ub2e4\uc591\ud55c \uc8fc\uc81c\ub97c \ub2e4\ub8f0 \uc608\uc815\uc774\ub2c8 \ub9ce\uc740 \uad00\uc2ec \ubd80\ud0c1\ub4dc\ub9bd\ub2c8\ub2e4. \uac10\uc0ac\ud569\ub2c8\ub2e4!<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\ub525\ub7ec\ub2dd\uacfc \uba38\uc2e0\ub7ec\ub2dd\uc758 \ubc1c\uc804\uc73c\ub85c \uc778\ud574 \ub370\uc774\ud130 \ubd84\uc11d\uc758 \uc811\uadfc \ubc29\uc2dd\uc774 \ud06c\uac8c \ubcc0\ud654\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uadf8 \uc911 \ud558\ub098\uac00 \uad70\uc9d1\ud654(clusterization) \uae30\uc220\uc785\ub2c8\ub2e4. \ubcf8 \ud3ec\uc2a4\ud2b8\uc5d0\uc11c\ub294 \uae4a\uc774 \uc788\ub294 K-\ud3c9\uade0 \uad70\uc9d1\ud654 \uc54c\uace0\ub9ac\uc998\uc744 \ud30c\uc774\ud1a0\uce58(Pytorch)\ub85c \uad6c\ud604\ud558\uc5ec \ub370\uc774\ud130 \ubd84\uc11d\uc5d0 \ud65c\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4. 1. K-\ud3c9\uade0 \uad70\uc9d1\ud654\ub780? K-\ud3c9\uade0 \uad70\uc9d1\ud654\ub294 \ube44\uc9c0\ub3c4 \ud559\uc2b5(non-supervised learning) \uc54c\uace0\ub9ac\uc998 \uc911 \ud558\ub098\ub85c, \uc8fc\uc5b4\uc9c4 \ub370\uc774\ud130 \ud3ec\uc778\ud2b8\ub97c K\uac1c\uc758 \ud074\ub7ec\uc2a4\ud130\ub85c \ub098\ub204\ub294 \ubc29\ubc95\uc785\ub2c8\ub2e4. \uc774 \uc54c\uace0\ub9ac\uc998\uc758 \ubaa9\uc801\uc740 \uac01 \ud074\ub7ec\uc2a4\ud130\uc758 \uc911\uc2ec (centroid)\uacfc &hellip; <a href=\"https:\/\/atmokpo.com\/w\/29920\/\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;\ub525\ub7ec\ub2dd \ud30c\uc774\ud1a0\uce58 \uac15\uc88c, K-\ud3c9\uade0 \uad70\uc9d1\ud654&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[33],"tags":[],"class_list":["post-29920","post","type-post","status-publish","format-standard","hentry","category-33"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\ub525\ub7ec\ub2dd \ud30c\uc774\ud1a0\uce58 \uac15\uc88c, K-\ud3c9\uade0 \uad70\uc9d1\ud654 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atmokpo.com\/w\/29920\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\ub525\ub7ec\ub2dd \ud30c\uc774\ud1a0\uce58 \uac15\uc88c, K-\ud3c9\uade0 \uad70\uc9d1\ud654 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"\ub525\ub7ec\ub2dd\uacfc \uba38\uc2e0\ub7ec\ub2dd\uc758 \ubc1c\uc804\uc73c\ub85c \uc778\ud574 \ub370\uc774\ud130 \ubd84\uc11d\uc758 \uc811\uadfc \ubc29\uc2dd\uc774 \ud06c\uac8c \ubcc0\ud654\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uadf8 \uc911 \ud558\ub098\uac00 \uad70\uc9d1\ud654(clusterization) \uae30\uc220\uc785\ub2c8\ub2e4. \ubcf8 \ud3ec\uc2a4\ud2b8\uc5d0\uc11c\ub294 \uae4a\uc774 \uc788\ub294 K-\ud3c9\uade0 \uad70\uc9d1\ud654 \uc54c\uace0\ub9ac\uc998\uc744 \ud30c\uc774\ud1a0\uce58(Pytorch)\ub85c \uad6c\ud604\ud558\uc5ec \ub370\uc774\ud130 \ubd84\uc11d\uc5d0 \ud65c\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4. 1. 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