{"id":25215,"date":"2024-10-26T09:53:04","date_gmt":"2024-10-26T09:53:04","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=25215"},"modified":"2024-11-26T08:02:30","modified_gmt":"2024-11-26T08:02:30","slug":"%eb%94%a5-%eb%9f%ac%eb%8b%9d%ec%9d%84-%ec%9d%b4%ec%9a%a9%ed%95%9c-%ec%9e%90%ec%97%b0%ec%96%b4-%ec%b2%98%eb%a6%ac-tf-idf-term-frequency-inverse-document-frequency","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/25215\/","title":{"rendered":"\ub525 \ub7ec\ub2dd\uc744 \uc774\uc6a9\ud55c \uc790\uc5f0\uc5b4 \ucc98\ub9ac: TF-IDF (Term Frequency-Inverse Document Frequency)"},"content":{"rendered":"<p><body><\/p>\n<p>\uc790\uc5f0\uc5b4 \ucc98\ub9ac\ub294 \ucef4\ud4e8\ud130\uc640 \uc778\uac04 \uc5b8\uc5b4 \uac04\uc758 \uc0c1\ud638\uc791\uc6a9\uc744 \ucd09\uc9c4\ud558\uae30 \uc704\ud55c \uae30\uc220 \ubd84\uc57c\ub85c, \uc5ec\ub7ec\uac00\uc9c0 \uae30\ubc95\ub4e4\uc774 \ud65c\uc6a9\ub418\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uadf8 \uc911 TF-IDF\ub294 \ubb38\uc11c\uc640 \ub2e8\uc5b4 \uac04\uc758 \uc0c1\uad00\uad00\uacc4\ub97c \ud3c9\uac00\ud558\ub294 \ub370 \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud558\uba70, \ub525 \ub7ec\ub2dd \ubaa8\ub378\uc5d0\uc11c\ub3c4 \ud575\uc2ec\uc801\uc73c\ub85c \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \ubcf8 \uae00\uc5d0\uc11c\ub294 TF-IDF\uc758 \uac1c\ub150, \uc218\uc2dd, \ub525 \ub7ec\ub2dd\uc5d0\uc11c\uc758 \ud65c\uc6a9 \uc0ac\ub840\ub97c \uc790\uc138\ud788 \uc124\uba85\ud558\uace0, \uc2e4\uc81c \uc801\uc6a9 \uc608\uc81c\ub97c \ud1b5\ud574 TF-IDF\ub97c \uc801\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>1. TF-IDF\uc758 \uac1c\ub150<\/h2>\n<p>TF-IDF\ub294 &#8216;Term Frequency-Inverse Document Frequency&#8217;\uc758 \uc57d\uc790\ub85c, \ud2b9\uc815 \ub2e8\uc5b4\uac00 \ubb38\uc11c \ub0b4\uc5d0\uc11c \uc5bc\ub9c8\ub098 \uc911\uc694\ud55c\uc9c0\ub97c \ud3c9\uac00\ud558\uae30 \uc704\ud55c \ud1b5\uacc4\uc801 \ucc99\ub3c4\uc785\ub2c8\ub2e4. TF-IDF\ub294 \ub2e4\uc74c \ub450 \uac00\uc9c0 \uc694\uc18c\ub85c \uad6c\uc131\ub429\ub2c8\ub2e4:<\/p>\n<ul>\n<li><strong>Term Frequency (TF)<\/strong>: \ud2b9\uc815 \ubb38\uc11c \ub0b4\uc5d0\uc11c \ud2b9\uc815 \ub2e8\uc5b4\uc758 \ub4f1\uc7a5 \ube48\ub3c4\uc785\ub2c8\ub2e4.<\/li>\n<li><strong>Inverse Document Frequency (IDF)<\/strong>: \uc804\uccb4 \ubb38\uc11c\uc5d0\uc11c \ud2b9\uc815 \ub2e8\uc5b4\uac00 \ub4f1\uc7a5\ud558\ub294 \ubb38\uc11c\uc758 \ube44\uc728\uc744 \ubc18\uc601\ud55c \uac12\uc785\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h2>2. TF-IDF\uc758 \uc218\uc2dd<\/h2>\n<p>TF-IDF\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uc218\uc2dd\uc73c\ub85c \uc815\uc758\ub429\ub2c8\ub2e4:<\/p>\n<pre><code>TF-IDF(t, d) = TF(t, d) \u00d7 IDF(t)<\/code><\/pre>\n<p>\uc5ec\uae30\uc11c:<\/p>\n<ul>\n<li><code>TF(t, d) = (Number of times term t appears in document d) \/ (Total number of terms in document d)<\/code><\/li>\n<li><code>IDF(t) = log_e(Total number of documents \/ Number of documents containing term t)<\/code><\/li>\n<\/ul>\n<p>\ub530\ub77c\uc11c TF-IDF\ub294 \ud2b9\uc815 \ub2e8\uc5b4\uc758 \uc911\uc694\ub3c4\ub97c \ub2e8\uc21c\ud788 \uacc4\uc0b0\ud558\ub294 \uac83\uc774 \uc544\ub2c8\ub77c, \uadf8 \ub2e8\uc5b4\uac00 \uc5bc\ub9c8\ub098 \ub9ce\uc774 \ub4f1\uc7a5\ud558\uace0 \uc788\ub294\uc9c0\uc640 \uadf8 \ub2e8\uc5b4\uac00 \ub098\ud0c0\ub098\ub294 \ubb38\uc11c\uc758 \uc218\ub97c \ub3d9\uc2dc\uc5d0 \uace0\ub824\ud569\ub2c8\ub2e4. \uc774\ub7ec\ud55c \ubc29\uc2dd\uc73c\ub85c TF-IDF\ub294 \uc601\uc5ed \ub0b4\uc5d0\uc11c \ub2e8\uc5b4\uc758 \uc0c1\ub300\uc801 \uc911\uc694\uc131\uc744 \uc798 \ub098\ud0c0\ub0bc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>3. TF-IDF\uc758 \ud65c\uc6a9<\/h2>\n<p>TF-IDF\ub294 \ub2e4\uc591\ud55c \uc790\uc5f0\uc5b4 \ucc98\ub9ac(NLP) \uc791\uc5c5\uc5d0\uc11c \ud65c\uc6a9\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub300\ud45c\uc801\uc778 \ud65c\uc6a9 \ubd84\uc57c\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n<ul>\n<li>\ubb38\uc11c \ud074\ub7ec\uc2a4\ud130\ub9c1<\/li>\n<li>\ubb38\uc11c \ubd84\ub958<\/li>\n<li>\uc815\ubcf4 \uac80\uc0c9<\/li>\n<\/ul>\n<h2>4. \ub525 \ub7ec\ub2dd\uacfc TF-IDF<\/h2>\n<p>\ub525 \ub7ec\ub2dd \ubaa8\ub378\uc5d0\uc11c TF-IDF\ub294 \uc8fc\ub85c \uc785\ub825 \ub370\uc774\ud130\uc758 \uc804\ucc98\ub9ac \uacfc\uc815\uc5d0\uc11c \ud65c\uc6a9\ub429\ub2c8\ub2e4. \ubb38\uc11c\uc758 \uc911\uc694\ud55c \ub2e8\uc5b4\ub4e4\uc744 \ucd94\ucd9c\ud558\uc5ec \ubca1\ud130 \ud615\ud0dc\ub85c \ubcc0\ud658\ud568\uc73c\ub85c\uc368, \ub525 \ub7ec\ub2dd \ubaa8\ub378\uc758 \uc785\ub825\uc73c\ub85c \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \uadf8 \uacfc\uc815\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n<ul>\n<li>\ubb38\uc11c\ub85c\ubd80\ud130 \ub2e8\uc5b4\ub97c \ucd94\ucd9c\ud558\uace0, \uac01 \ub2e8\uc5b4\uc758 TF-IDF \uac12\uc744 \uacc4\uc0b0<\/li>\n<li>TF-IDF \uac12\uc744 \uc0ac\uc6a9\ud558\uc5ec \ubb38\uc11c \ubca1\ud130 \uc0dd\uc131<\/li>\n<li>\uc0dd\uc131\ub41c \ubb38\uc11c \ubca1\ud130\ub97c \ub525 \ub7ec\ub2dd \ubaa8\ub378\uc5d0 \uc785\ub825<\/li>\n<\/ul>\n<h2>5. TF-IDF\uc758 \uc7a5\ub2e8\uc810<\/h2>\n<p>TF-IDF\ub294 \uc5ec\ub7ec \uac00\uc9c0 \uc7a5\uc810\uacfc \ub2e8\uc810\uc744 \uac00\uc9c0\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \ubd80\ubd84\uc5d0\uc11c\ub294 \uac01\uac01\uc5d0 \ub300\ud574 \uc124\uba85\ud558\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>5.1 \uc7a5\uc810<\/h3>\n<ul>\n<li>\ub2e8\uc5b4\uc758 \uc0c1\ub300\uc801 \uc911\uc694\ub3c4\ub97c \ubc18\uc601: TF-IDF\ub294 \ube48\ub3c4\uac00 \ub192\uc740 \ub2e8\uc5b4\uc5d0 \ub354 \ub9ce\uc740 \uac00\uc911\uce58\ub97c \ubd80\uc5ec\ud558\ubbc0\ub85c, \ud2b9\uc815 \ubb38\uc11c\uc5d0\uc11c \uc911\uc694\ud55c \ub2e8\uc5b4\ub97c \uac15\uc870\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<li>\uc815\ubcf4 \uac80\uc0c9\uc5d0 \ud6a8\uacfc\uc801: TF-IDF\ub294 \uac80\uc0c9 \uc5d4\uc9c4\uc5d0\uc11c \ubb38\uc11c\uc758 \uc801\ud569\uc131\uc744 \ud3c9\uac00\ud558\ub294 \ub370 \uc720\uc6a9\ud558\uac8c \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/li>\n<li>\uacc4\uc0b0\uc774 \uac04\ub2e8: TF-IDF\ub294 \uc0c1\ub300\uc801\uc73c\ub85c \uc218\ud559\uc801\uc778 \uacc4\uc0b0\uc774 \uac04\ub2e8\ud558\uc5ec \uc774\ud574\ud558\uae30 \uc26c\uc6b4 \uc7a5\uc810\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h3>5.2 \ub2e8\uc810<\/h3>\n<ul>\n<li>\ubb38\ub9e5 \ubb34\uc2dc: TF-IDF\ub294 \ub2e8\uc5b4\uc758 \uc6d0 \uc758\ubbf8\ub098 \ubb38\ub9e5\uc744 \uace0\ub824\ud558\uc9c0 \uc54a\uae30 \ub54c\ubb38\uc5d0, \uc5ed\uc124\uc801\uc774\uac70\ub098 \uc911\uc758\uc801\uc778 \ub2e8\uc5b4\uc5d0 \ub300\ud55c \ucc98\ub9ac\uac00 \ubd80\uc871\ud569\ub2c8\ub2e4.<\/li>\n<li>\ud76c\uc18c\uc131 \ubb38\uc81c: \ub9ce\uc740 \ud14d\uc2a4\ud2b8\uc5d0\uc11c \ub2e8\uc5b4\uc758 \uc870\ud569\uc774 \ub2e4\uc591\ud558\uc5ec \ud76c\uc18c\ud55c \ubca1\ud130\uac00 \uc0dd\uc131\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub294 \ub525 \ub7ec\ub2dd \ubaa8\ub378\uc758 \ud559\uc2b5\uc5d0 \ubd80\uc815\uc801\uc778 \uc601\ud5a5\uc744 \uc904 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h2>6. TF-IDF \uc801\uc6a9 \uc608\uc81c<\/h2>\n<p>\uc774\uc81c TF-IDF\ub97c \uc2e4\uc81c\ub85c \uc801\uc6a9\ud574\ubcf4\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc774\ubc88 \uc608\uc81c\uc5d0\uc11c\ub294 Python\uc758 <code>scikit-learn<\/code> \ub77c\uc774\ube0c\ub7ec\ub9ac\ub97c \uc0ac\uc6a9\ud558\uc5ec TF-IDF\ub97c \uc801\uc6a9\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>6.1 \ub370\uc774\ud130 \uc900\ube44<\/h3>\n<p>\uc6b0\uc120 TF-IDF\ub97c \uc801\uc6a9\ud560 \uc0d8\ud50c \ubb38\uc11c\ub97c \uc900\ube44\ud569\ub2c8\ub2e4:<\/p>\n<pre><code>documents = [\n    \"\ub525 \ub7ec\ub2dd\uc740 \uc778\uacf5\uc9c0\ub2a5\uc758 \ud55c \ubd84\uc57c\uc785\ub2c8\ub2e4.\",\n    \"\uc790\uc5f0\uc5b4 \ucc98\ub9ac\ub294 Deep Learning\uc5d0\uc11c \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud569\ub2c8\ub2e4.\",\n    \"Python\uc744 \uc0ac\uc6a9\ud558\uc5ec NLP\ub97c \uad6c\ud604\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\",\n]\n<\/code><\/pre>\n<h3>6.2 TF-IDF \ubca1\ud130 \uc0dd\uc131<\/h3>\n<p>TF-IDF \ubca1\ud130\ub97c \uc0dd\uc131\ud558\uae30 \uc704\ud574\uc11c\ub294 scikit-learn\uc758 <code>TfidfVectorizer<\/code>\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4:<\/p>\n<pre><code>from sklearn.feature_extraction.text import TfidfVectorizer\n\nvectorizer = TfidfVectorizer()\ntfidf_matrix = vectorizer.fit_transform(documents)\n\nfeature_names = vectorizer.get_feature_names_out()\ndense = tfidf_matrix.todense()\ndenselist = dense.tolist()\ndf_tfidf = pd.DataFrame(denselist, columns=feature_names)\nprint(df_tfidf)\n<\/code><\/pre>\n<p>\uc704\uc758 \ucf54\ub4dc\ub97c \ud1b5\ud574 \uac01 \ubb38\uc11c\uc5d0 \ub300\ud55c \ub2e8\uc5b4\uc758 TF-IDF \uac12\uc774 \ub2f4\uae34 \ub370\uc774\ud130\ud504\ub808\uc784\uc744 \uc0dd\uc131\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \uacb0\uacfc\ub97c \uae30\ubc18\uc73c\ub85c \ub525 \ub7ec\ub2dd \ubaa8\ub378\uc758 \uc785\ub825 \ub370\uc774\ud130\ub85c \ud65c\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>\uacb0\ub860<\/h2>\n<p>TF-IDF\ub294 \uc790\uc5f0\uc5b4 \ucc98\ub9ac\uc5d0\uc11c \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud558\uba70, \ub525 \ub7ec\ub2dd \ubaa8\ub378\uc5d0\uc11c\ub3c4 \ud6a8\uacfc\uc801\uc73c\ub85c \ud65c\uc6a9\ub420 \uc218 \uc788\ub294 \uac00\uce58 \uc788\ub294 \uae30\ubc95\uc785\ub2c8\ub2e4. \ubcf8 \uae00\uc744 \ud1b5\ud574 TF-IDF\uc758 \uac1c\ub150, \uacc4\uc0b0 \ubc29\ubc95, \ud65c\uc6a9 \uc608\uc81c \ub4f1\uc744 \uc790\uc138\ud788 \uc0b4\ud3b4\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \uc774\uc81c \uc5ec\ub7ec\ubd84\uc740 TF-IDF\ub97c \ud65c\uc6a9\ud558\uc5ec \uc790\uc5f0\uc5b4 \ucc98\ub9ac \uad00\ub828 \ud504\ub85c\uc81d\ud2b8\uc5d0 \uc801\uc6a9\ud560 \uc218 \uc788\ub294 \ub2a5\ub825\uc744 \uac16\ucd94\uac8c \ub418\uc5c8\uc2b5\ub2c8\ub2e4.<\/p>\n<div class=\"note\">\n<strong>\ucc38\uace0 \uc790\ub8cc:<\/strong><\/p>\n<ul>\n<li>Y. Bengio, &#8220;Learning Deep Architectures for AI&#8221;, Foundations and Trends in Machine Learning, 2009.<\/li>\n<li>C. D. Manning, P. Raghavan, H. Sch\u00fctze, &#8220;Introduction to Information Retrieval&#8221;, 2008.<\/li>\n<li>scikit-learn Documentation, <a href=\"https:\/\/scikit-learn.org\/stable\/modules\/feature_extraction.html#tfidfvectorizer\" target=\"_blank\" rel=\"noopener\">https:\/\/scikit-learn.org\/stable\/modules\/feature_extraction.html#tfidfvectorizer<\/a><\/li>\n<\/ul>\n<\/div>\n<p><\/body><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\uc790\uc5f0\uc5b4 \ucc98\ub9ac\ub294 \ucef4\ud4e8\ud130\uc640 \uc778\uac04 \uc5b8\uc5b4 \uac04\uc758 \uc0c1\ud638\uc791\uc6a9\uc744 \ucd09\uc9c4\ud558\uae30 \uc704\ud55c \uae30\uc220 \ubd84\uc57c\ub85c, \uc5ec\ub7ec\uac00\uc9c0 \uae30\ubc95\ub4e4\uc774 \ud65c\uc6a9\ub418\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uadf8 \uc911 TF-IDF\ub294 \ubb38\uc11c\uc640 \ub2e8\uc5b4 \uac04\uc758 \uc0c1\uad00\uad00\uacc4\ub97c \ud3c9\uac00\ud558\ub294 \ub370 \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud558\uba70, \ub525 \ub7ec\ub2dd \ubaa8\ub378\uc5d0\uc11c\ub3c4 \ud575\uc2ec\uc801\uc73c\ub85c \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \ubcf8 \uae00\uc5d0\uc11c\ub294 TF-IDF\uc758 \uac1c\ub150, \uc218\uc2dd, \ub525 \ub7ec\ub2dd\uc5d0\uc11c\uc758 \ud65c\uc6a9 \uc0ac\ub840\ub97c \uc790\uc138\ud788 \uc124\uba85\ud558\uace0, \uc2e4\uc81c \uc801\uc6a9 \uc608\uc81c\ub97c \ud1b5\ud574 TF-IDF\ub97c \uc801\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. 1. TF-IDF\uc758 \uac1c\ub150 TF-IDF\ub294 &hellip; <a href=\"https:\/\/atmokpo.com\/w\/25215\/\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;\ub525 \ub7ec\ub2dd\uc744 \uc774\uc6a9\ud55c \uc790\uc5f0\uc5b4 \ucc98\ub9ac: TF-IDF (Term Frequency-Inverse Document Frequency)&#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":[16],"tags":[],"class_list":["post-25215","post","type-post","status-publish","format-standard","hentry","category-16"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\ub525 \ub7ec\ub2dd\uc744 \uc774\uc6a9\ud55c \uc790\uc5f0\uc5b4 \ucc98\ub9ac: TF-IDF (Term Frequency-Inverse Document Frequency) - \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\/25215\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\ub525 \ub7ec\ub2dd\uc744 \uc774\uc6a9\ud55c \uc790\uc5f0\uc5b4 \ucc98\ub9ac: TF-IDF (Term Frequency-Inverse Document Frequency) - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"\uc790\uc5f0\uc5b4 \ucc98\ub9ac\ub294 \ucef4\ud4e8\ud130\uc640 \uc778\uac04 \uc5b8\uc5b4 \uac04\uc758 \uc0c1\ud638\uc791\uc6a9\uc744 \ucd09\uc9c4\ud558\uae30 \uc704\ud55c \uae30\uc220 \ubd84\uc57c\ub85c, \uc5ec\ub7ec\uac00\uc9c0 \uae30\ubc95\ub4e4\uc774 \ud65c\uc6a9\ub418\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uadf8 \uc911 TF-IDF\ub294 \ubb38\uc11c\uc640 \ub2e8\uc5b4 \uac04\uc758 \uc0c1\uad00\uad00\uacc4\ub97c \ud3c9\uac00\ud558\ub294 \ub370 \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud558\uba70, \ub525 \ub7ec\ub2dd \ubaa8\ub378\uc5d0\uc11c\ub3c4 \ud575\uc2ec\uc801\uc73c\ub85c \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \ubcf8 \uae00\uc5d0\uc11c\ub294 TF-IDF\uc758 \uac1c\ub150, \uc218\uc2dd, \ub525 \ub7ec\ub2dd\uc5d0\uc11c\uc758 \ud65c\uc6a9 \uc0ac\ub840\ub97c \uc790\uc138\ud788 \uc124\uba85\ud558\uace0, \uc2e4\uc81c \uc801\uc6a9 \uc608\uc81c\ub97c \ud1b5\ud574 TF-IDF\ub97c \uc801\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. 1. 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