{"id":64380,"date":"2026-01-23T13:16:39","date_gmt":"2026-01-23T05:16:39","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/64380.html"},"modified":"2026-01-23T13:16:39","modified_gmt":"2026-01-23T05:16:39","slug":"%e3%80%90llm%e5%9f%ba%e7%a1%80%e6%95%99%e7%a8%8b%e3%80%91%e6%96%87%e6%9c%ac%e7%89%b9%e5%be%81%e8%a1%a8%e7%a4%ba%e6%96%b9%e6%b3%95%e5%85%a5%e9%97%a8%e4%b8%80%ef%bc%9abow","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/64380.html","title":{"rendered":"\u3010LLM\u57fa\u7840\u6559\u7a0b\u3011\u6587\u672c\u7279\u5f81\u8868\u793a\u65b9\u6cd5\u5165\u95e8(\u4e00)\uff1aBoW"},"content":{"rendered":"<p>\u200b \u8bed\u8a00\u4eba\u5de5\u667a\u80fd\u5386\u53f2\u59cb\u4e8e\u4e00\u79cd\u540d\u4e3a\u8bcd\u888b&#xff08;bag-of-words&#xff09;\u7684\u6280\u672f&#xff0c;\u8fd9\u662f\u4e00\u79cd\u8868\u793a\u975e\u7ed3\u6784\u5316\u6587\u672c\u7684\u65b9\u6cd5 \u3002\u5b83\u65e9\u572820\u4e16\u7eaa50\u5e74\u4ee3\u5c31\u88ab\u63d0\u51fa&#xff0c;\u4f46\u76f4\u52302000\u5e74\u524d\u540e\u624d\u5f00\u59cb\u6d41\u884c\u3002<\/p>\n<ul>\n<li>\n<p>\u6838\u5fc3\u601d\u60f3&#xff1a;\u5c06\u6587\u672c\u770b\u4f5c\u4e00\u4e2a\u201c\u8bcd\u7684\u96c6\u5408\u201d&#xff0c;\u5ffd\u7565\u8bcd\u5e8f&#xff0c;\u53ea\u7edf\u8ba1\u6bcf\u4e2a\u8bcd\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n<p>\u6362\u8a00\u4e4b&#xff0c;\u5728 BoW \u6a21\u578b\u4e2d&#xff0c;\u53e5\u5b50\u6216\u6587\u6863\u88ab\u8868\u793a\u4e3a\u4e00\u4e2a\u56fa\u5b9a\u957f\u5ea6\u7684\u5411\u91cf&#xff0c;\u5411\u91cf\u7684\u6bcf\u4e2a\u7ef4\u5ea6\u5bf9\u5e94\u8bcd\u6c47\u8868&#xff08;vocabulary&#xff09;\u4e2d\u7684\u4e00\u4e2a\u8bcd&#xff0c;\u503c\u8868\u793a\u8be5\u8bcd\u5728\u6587\u672c\u4e2d\u51fa\u73b0\u7684\u9891\u7387\u6216\u6b21\u6570\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u4e00\u3001\u4ecb\u7ecd<\/h3>\n<p>\u200b \u8bcd\u888b\u6a21\u578b\u662f\u4e00\u79cd\u6587\u672c\u8868\u793a&#xff0c;\u7528\u4e8e\u63cf\u8ff0\u6587\u6863\u4e2d\u5355\u8bcd\u7684\u51fa\u73b0\u60c5\u51b5\u3002\u6211\u4eec\u53ea\u8ddf\u8e2a\u5355\u8bcd\u6570\u91cf&#xff0c;\u5ffd\u7565\u8bed\u6cd5\u7ec6\u8282\u548c\u8bcd\u5e8f\u3002\u4e4b\u6240\u4ee5\u79f0\u4e4b\u4e3a\u201c\u8bcd\u888b\u201d&#xff0c;\u662f\u56e0\u4e3a\u4efb\u4f55\u5173\u4e8e\u6587\u6863\u4e2d\u5355\u8bcd\u987a\u5e8f\u6216\u7ed3\u6784\u7684\u4fe1\u606f\u90fd\u4f1a\u88ab\u4e22\u5f03\u3002<font color=\"red\">\u8be5\u6a21\u578b\u53ea\u5173\u6ce8\u5df2\u77e5\u5355\u8bcd\u662f\u5426\u51fa\u73b0\u5728\u6587\u6863\u4e2d&#xff0c;\u800c\u4e0d\u662f\u51fa\u73b0\u5728\u6587\u6863\u7684\u54ea\u4e2a\u4f4d\u7f6e\u3002<\/font><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260123051634-697304320e054.webp\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>1.1 \u7ed3\u6784\u5316\u5904\u7406\u6587\u672c<\/h4>\n<p>\u200b \u6587\u672c\u7684\u6700\u5927\u95ee\u9898\u4e4b\u4e00\u662f\u5b83\u6df7\u4e71\u4e14\u975e\u7ed3\u6784\u5316&#xff0c;\u800c\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u66f4\u559c\u6b22\u7ed3\u6784\u5316\u3001\u5b9a\u4e49\u660e\u786e\u7684\u56fa\u5b9a\u957f\u5ea6\u8f93\u5165&#xff0c;\u901a\u8fc7\u4f7f\u7528\u8bcd\u888b\u6280\u672f&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5c06\u53ef\u53d8\u957f\u5ea6\u7684\u6587\u672c\u8f6c\u6362\u4e3a\u56fa\u5b9a\u957f\u5ea6\u7684\u5411\u91cf**\u3002**<\/p>\n<p>\u200b \u6b64\u5916&#xff0c;\u5728\u66f4\u7cbe\u7ec6\u7684\u5c42\u9762\u4e0a&#xff0c;\u673a\u5668\u5b66\u4e60\u6a21\u578b\u5904\u7406\u7684\u662f\u6570\u503c\u6570\u636e&#xff0c;\u800c\u4e0d\u662f\u6587\u672c\u6570\u636e\u3002\u66f4\u5177\u4f53\u5730\u8bf4&#xff0c;\u901a\u8fc7\u4f7f\u7528\u8bcd\u888b&#xff08;BoW&#xff09;\u6280\u672f&#xff0c;\u6211\u4eec\u5c06\u6587\u672c\u8f6c\u6362\u4e3a\u5176\u7b49\u6548\u7684\u6570\u5b57\u5411\u91cf\u3002<\/p>\n<h4>1.2 \u6a21\u578b\u7279\u70b9<\/h4>\n<table>\n<tr>\u4f18\u70b9\u7f3a\u70b9<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">\u7b80\u5355\u6613\u5b9e\u73b0&#xff0c;\u8ba1\u7b97\u9ad8\u6548<\/td>\n<td align=\"center\">\u5b8c\u5168\u4e22\u5931\u8bcd\u5e8f\u4e0e\u4e0a\u4e0b\u6587\u4fe1\u606f<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u53ef\u4f5c\u4e3a\u8bb8\u591a\u6a21\u578b&#xff08;\u5982\u6734\u7d20\u8d1d\u53f6\u65af\u3001SVM&#xff09;\u7684\u8f93\u5165\u7279\u5f81<\/td>\n<td align=\"center\">\u8bcd\u6c47\u8868\u7ef4\u5ea6\u9ad8&#xff0c;\u7a00\u758f\u6027\u5f3a<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">\u9002\u7528\u4e8e\u5c0f\u89c4\u6a21\u6587\u672c\u5206\u6790\u3001\u7279\u5f81\u5de5\u7a0b\u521d\u671f<\/td>\n<td align=\"center\">\u65e0\u6cd5\u5904\u7406\u540c\u4e49\u8bcd\u3001\u591a\u4e49\u8bcd\u95ee\u9898<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u200b \u603b\u7684\u6765\u8bf4&#xff0c;\u8bcd\u888b\u6a21\u578b\u4e3a\u6587\u672c\u5411\u91cf\u5316\u63d0\u4f9b\u4e86\u6700\u57fa\u7840\u7684\u5f62\u5f0f\u5316\u6846\u67b6\u3002\u4f46\u7531\u4e8e\u5b83\u4ec5\u4ec5\u5c06\u8bed\u8a00\u89c6\u4e3a\u4e00\u4e2a\u51e0\u4e4e\u5b57\u9762\u610f\u4e49\u4e0a\u7684\u201c\u8bcd\u888b\u201d&#xff0c;\u800c\u5ffd\u7565\u4e86\u6587\u672c\u7684\u8bed\u4e49\u7279\u6027\u548c\u4e0a\u4e0b\u6587\u542b\u4e49&#xff0c;\u56e0\u6b64\u96be\u4ee5\u6709\u6548\u8868\u8fbe\u8bcd\u4e0e\u8bcd\u4e4b\u95f4\u7684\u8bed\u4e49\u8054\u7cfb\u3002\u8fd9\u4e5f\u6210\u4e3a\u540e\u7eed Word2Vec\u3001Transformer \u7b49\u6a21\u578b\u63d0\u51fa\u7684\u76f4\u63a5\u52a8\u56e0\u3002<\/p>\n<h3>\u4e8c\u3001\u6784\u5efa\u6b65\u9aa4<\/h3>\n<p>\u200b \u8bcd\u888b\u6a21\u578b\u7684\u5de5\u4f5c\u539f\u7406\u5982\u4e0b&#xff1a;<\/p>\n<h4>2.1 \u6587\u672c\u8868\u793a\u7684\u8d77\u70b9&#xff1a;\u5206\u8bcd&#xff08;Tokenization&#xff09;<\/h4>\n<p>\u5206\u8bcd\u662f\u6784\u5efa\u8bcd\u888b\u6a21\u578b\u7684\u7b2c\u4e00\u6b65&#xff0c;\u4e5f\u662f\u5f71\u54cd\u6a21\u578b\u6027\u80fd\u7684\u91cd\u8981\u56e0\u7d20\u3002<\/p>\n<p>\u200b \u5728\u81ea\u7136\u8bed\u8a00\u5904\u7406\u4e2d&#xff0c;\u8ba1\u7b97\u673a\u65e0\u6cd5\u76f4\u63a5\u7406\u89e3\u539f\u59cb\u6587\u672c\u3002\u5206\u8bcd&#xff08;Tokenization&#xff09; \u662f\u5c06\u6587\u672c\u5207\u5206\u6210\u6700\u5c0f\u53ef\u5904\u7406\u5355\u5143&#xff08;\u8bcd\u6216\u5b50\u8bcd&#xff0c;token&#xff09;\u7684\u8fc7\u7a0b&#xff0c;\u662f\u6240\u6709\u6587\u672c\u8868\u793a\u65b9\u6cd5\u7684\u57fa\u7840\u6b65\u9aa4\u3002<\/p>\n<ul>\n<li>\u4e3e\u4f8b&#xff1a;<\/li>\n<\/ul>\n<p>\u200b \u5047\u8bbe\u6211\u4eec\u6709\u4e24\u4e2a\u53e5\u5b50\u9700\u8981\u521b\u5efa\u6570\u503c\u8868\u793a\u3002\u8bcd\u888b\u6a21\u578b\u7684\u7b2c\u4e00\u6b65\u662f\u5206\u8bcd&#xff08;tokenization&#xff09;&#xff0c;\u5373\u5c06\u53e5\u5b50\u62c6\u5206\u6210\u5355\u4e2a\u8bcd\u6216\u5b50\u8bcd&#xff08;\u8bcd\u5143&#xff0c;token&#xff09;\u3002\u6700\u5e38\u89c1\u7684\u5206\u8bcd\u65b9\u6cd5\u662f\u901a\u8fc7\u7a7a\u683c\u5206\u5272\u6765\u628a\u53e5\u5b50\u5206\u5272\u6210\u8bcd\u3002\u7136\u800c&#xff0c;\u8fd9\u79cd\u65b9\u6cd5\u4e5f\u6709\u5176\u7f3a\u70b9&#xff0c;\u56e0\u4e3a\u67d0\u4e9b\u8bed\u8a00&#xff08;\u5982\u6c49\u8bed&#xff09;\u7684\u8bcd\u4e4b\u95f4\u6ca1\u6709\u7a7a\u683c\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260123051634-697304322c0a3.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h5>(1) \u4e3a\u4ec0\u4e48\u9700\u8981\u5206\u8bcd&#xff1f;<\/h5>\n<ul>\n<li>\u6a21\u578b\u7684\u8f93\u5165\u5fc5\u987b\u662f\u79bb\u6563\u7684 token \u5e8f\u5217&#xff0c;\u4e0d\u80fd\u76f4\u63a5\u5904\u7406\u5b57\u7b26\u4e32\u3002<\/li>\n<li>\u5bf9\u4e8e\u82f1\u8bed\u7b49\u4ee5\u7a7a\u683c\u5206\u8bcd\u7684\u8bed\u8a00&#xff0c;\u53ef\u76f4\u63a5\u6309\u7a7a\u683c\u6216\u6807\u70b9\u5207\u5206&#xff1b;<\/li>\n<li>\u5bf9\u4e8e\u4e2d\u6587\u3001\u65e5\u8bed\u7b49\u65e0\u663e\u5f0f\u8bcd\u754c\u7684\u8bed\u8a00&#xff0c;\u9700\u8981\u4f7f\u7528\u5206\u8bcd\u7b97\u6cd5&#xff08;\u5982\u7ed3\u5df4\u5206\u8bcd\u3001BERT WordPiece\u3001SentencePiece \u7b49&#xff09;\u3002<\/li>\n<\/ul>\n<h5>(2) \u5e38\u89c1\u5206\u8bcd\u65b9\u5f0f<\/h5>\n<table>\n<tr>\u65b9\u6cd5\u8bf4\u660e\u9002\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">Word-level Tokenization<\/td>\n<td align=\"center\">\u6309\u8bcd\u5207\u5206&#xff0c;\u4f8b\u5982\u201c\u6211 \u559c\u6b22 NLP\u201d \u2192 [\u201c\u6211\u201d, \u201c\u559c\u6b22\u201d, \u201cNLP\u201d]<\/td>\n<td align=\"center\">\u82f1\u8bed\u3001\u7ecf\u8fc7\u5206\u8bcd\u7684\u4e2d\u6587\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">Character-level Tokenization<\/td>\n<td align=\"center\">\u6309\u5b57\u5207\u5206&#xff0c;\u4f8b\u5982\u201c\u6211\u559c\u6b22NLP\u201d \u2192 [\u201c\u6211\u201d, \u201c\u559c\u201d, \u201c\u6b22\u201d, \u201cN\u201d, \u201cL\u201d, \u201cP\u201d]<\/td>\n<td align=\"center\">\u4f4e\u8d44\u6e90\u8bed\u8a00\u3001\u5b57\u7b26\u6a21\u578b<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">Subword Tokenization&#xff08;BPE\/WordPiece&#xff09;<\/td>\n<td align=\"center\">\u5c06\u8bcd\u62c6\u6210\u66f4\u5c0f\u7684\u5355\u5143&#xff08;\u5982\u201cunhappiness\u201d \u2192 [\u201cun\u201d, \u201chappy\u201d, \u201cness\u201d]&#xff09;<\/td>\n<td align=\"center\">\u73b0\u4ee3\u5927\u6a21\u578b&#xff08;\u5982 BERT\u3001LLaMA&#xff09;\u5e38\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>\u5728 BoW \u6a21\u578b\u4e2d&#xff0c;\u5206\u8bcd\u7ed3\u679c\u51b3\u5b9a\u4e86\u8bcd\u6c47\u8868\u7684\u6784\u6210\u3002 \u4e0d\u540c\u7684\u5206\u8bcd\u7b56\u7565&#xff0c;\u4f1a\u663e\u8457\u5f71\u54cd BoW \u7279\u5f81\u7a7a\u95f4\u7684\u7ef4\u5ea6\u4e0e\u7a00\u758f\u6027&#xff1a;\n<ul>\n<li>\u5206\u5f97\u592a\u7ec6 \u2192 \u8bcd\u6c47\u8868\u8fc7\u5927&#xff0c;\u7a00\u758f\u6027\u9ad8&#xff1b;<\/li>\n<li>\u5206\u5f97\u592a\u7c97 \u2192 \u65e0\u6cd5\u6355\u6349\u8bcd\u4e49\u53d8\u5316\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>2.1 \u5efa\u7acb\u8bcd\u6c47\u8868&#xff08;Vocabulary&#xff09;<\/h4>\n<p>\u200b \u5728\u5206\u8bcd\u4e4b\u540e&#xff0c;\u6211\u4eec\u5c06\u6bcf\u4e2a\u53e5\u5b50\u4e2d\u6240\u6709\u4e0d\u540c\u7684\u8bcd\u7ec4\u5408\u8d77\u6765&#xff0c;\u521b\u5efa\u4e00\u4e2a\u53ef\u7528\u4e8e\u8868\u793a\u53e5\u5b50\u7684\u8bcd\u8868&#xff08;vocabulary&#xff09;\u3002\u5373\u4ece\u8bed\u6599\u5e93\u4e2d\u63d0\u53d6\u6240\u6709\u4e0d\u540c\u7684\u8bcd&#xff0c;\u5f62\u6210\u4e00\u4e2a\u56fa\u5b9a\u7684\u8bcd\u6c47\u96c6\u5408\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260123051634-69730432eb0c7.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u200b \u4f7f\u7528\u8bcd\u8868&#xff0c;\u6211\u4eec\u53ea\u9700\u8ba1\u7b97\u6bcf\u4e2a\u53e5\u5b50\u4e2d\u8bcd\u51fa\u73b0\u7684\u6b21\u6570&#xff0c;\u5c31\u521b\u5efa\u4e86\u4e00\u4e2a\u8bcd\u888b\u3002<\/p>\n<h4>2.2 \u5411\u91cf\u5316\u8868\u793a(Vectorization)<\/h4>\n<p>\u200b \u8bcd\u888b\u6a21\u578b\u65e8\u5728\u4ee5\u6570\u5b57\u5f62\u5f0f\u521b\u5efa\u6587\u672c\u7684\u8868\u793a&#xff08;representation&#xff09;&#xff0c;\u4e5f\u79f0\u4e3a\u5411\u91cf\u6216\u5411\u91cf\u8868\u793a\u3002\u901a\u8fc7\u8fc7\u8ba1\u7b97\u5355\u4e2a\u8bcd\u51fa\u73b0\u7684\u6b21\u6570\u521b\u5efa\u8bcd\u888b&#xff0c;\u8fd9\u4e9b\u503c\u88ab\u79f0\u4e3a\u5411\u91cf\u8868\u793a\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260123051635-69730433cd3a6.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>2.3 \u8bed\u6599\u5e93\u548c\u8bcd\u8868<\/h4>\n<table>\n<tr>\u540d\u79f0\u542b\u4e49\u793a\u4f8b<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">corpus<\/td>\n<td align=\"center\">\u539f\u59cb\u8bed\u6599\u5e93&#xff08;\u539f\u59cb\u6587\u672c\u96c6\u5408&#xff09;<\/td>\n<td align=\"center\">[\u201cthis is a book\u201d, \u201cthat is a pen\u201d]<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">feature_names<\/td>\n<td align=\"center\">\u7279\u5f81\u8bcd\u6c47\u8868&#xff08;\u7ecf\u8fc7\u5206\u8bcd\u3001\u6e05\u6d17\u540e&#xff09;<\/td>\n<td align=\"center\">[\u2018book\u2019, \u2018pen\u2019, \u2018this\u2019, \u2018that\u2019]<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u4e09\u3001BoW\u6784\u5efa<\/h3>\n<p>\u200b \u4e0b\u9762\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u793a\u4f8b\u6765\u8bf4\u660e \u8bcd\u888b\u6a21\u578b&#xff08;Bag of Words&#xff09; \u7684\u6784\u5efa\u8fc7\u7a0b\u3002<\/p>\n<ul>\n<li>\n<p>Sentence 1: \u201dWelcome to Great Learning, Now start learning\u201d<\/p>\n<\/li>\n<li>\n<p>Sentence 2: \u201cLearning is a good practice\u201d<\/p>\n<\/li>\n<\/ul>\n<h4>3.1 \u5206\u8bcd<\/h4>\n<p>Tokenization<\/p>\n<p>\u5c06\u6bcf\u4e2a\u53e5\u5b50\u62c6\u5206\u4e3a\u5355\u8bcd&#xff1a;<\/p>\n<ul>\n<li>Sentence 1 \u2192 [Welcome, To, Great, Learning, Now, start, learning]<\/li>\n<li>Sentence 2 \u2192 [learning, is, a, good, practice] <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260123051636-69730434eb855.webp\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<\/ul>\n<h4>3.2 \u6784\u5efa\u8bcd\u8868<\/h4>\n<p>Vocabulary<\/p>\n<p>\u200b \u6d4f\u89c8\u4e0a\u8ff0\u6587\u672c\u4e2d\u7684\u6240\u6709\u5355\u8bcd&#xff0c;\u5e76\u5217\u51fa\u6a21\u578b\u8bcd\u6c47\u8868\u4e2d\u7684\u6240\u6709\u5355\u8bcd\u3002<\/p>\n<p>Welcome<br \/>\nTo<br \/>\nGreat<br \/>\nLearning<br \/>\n,<br \/>\nNow<br \/>\nstart<br \/>\nlearning<br \/>\nis<br \/>\na<br \/>\ngood<br \/>\npractice<\/p>\n<p>\u200b \u8fd9\u91cc\u9700\u8981\u6ce8\u610f&#xff0c;\u201cLearning\u201d \u548c \u201clearning\u201d \u56e0\u5927\u5c0f\u5199\u4e0d\u540c\u88ab\u89c6\u4e3a\u4e24\u4e2a\u4e0d\u540c\u7684\u8bcd&#xff0c;\u56e0\u6b64\u5728\u8bcd\u6c47\u8868\u4e2d\u4f1a\u91cd\u590d\u51fa\u73b0\u3002\u540c\u65f6&#xff0c;\u6807\u70b9\u7b26\u53f7&#xff08;\u5982\u9017\u53f7 \u201c,\u201d&#xff09; \u4e5f\u88ab\u5206\u8bcd\u5668\u8bc6\u522b\u4e3a\u72ec\u7acb\u7684 token&#xff0c;\u5e76\u88ab\u8ba1\u5165\u8bcd\u888b\u4e2d\u3002<\/p>\n<p>\u200b \u56e0\u4e3a\u6211\u4eec\u77e5\u9053\u8bcd\u6c47\u8868\u6709 12 \u4e2a\u5355\u8bcd&#xff0c;\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u56fa\u5b9a\u957f\u5ea6\u4e3a 12 \u7684\u6587\u6863\u8868\u793a&#xff0c;\u5e76\u5728\u5411\u91cf\u4e2d\u7684\u4e00\u4e2a\u4f4d\u7f6e\u5bf9\u6bcf\u4e2a\u5355\u8bcd\u8fdb\u884c\u8bc4\u5206\u3002<\/p>\n<h4>3.3 \u8ba1\u7b97\u8bcd\u9891\u5e76\u7528\u5411\u91cf\u8868\u793a<\/h4>\n<p>\u200b \u6211\u4eec\u8fd9\u91cc\u91c7\u7528\u7684\u8bc4\u5206\u65b9\u6cd5\u662f\u7edf\u8ba1\u6bcf\u4e2a\u5355\u8bcd\u7684\u51fa\u73b0\u6b21\u6570&#xff0c;\u4e0d\u5b58\u5728\u5219\u8bb0\u4e3a0\u3002\u8fd9\u79cd\u8bc4\u5206\u65b9\u6cd5\u6bd4\u8f83\u5e38\u7528\u3002<\/p>\n<ul>\n<li>\n<p>Sentence1<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260123051637-697304352627d.webp\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5c06\u4e0a\u8ff0\u9891\u7387\u5199\u5165\u5411\u91cf\u4e2d&#xff1a;<\/p>\n<p> [1,1,1,1,1,1,1,1,0,0,0]\n <\/li>\n<li>\n<p>Sentence2<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260123051637-697304355f7fa.webp\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5c06\u4e0a\u8ff0\u9891\u7387\u5199\u5165\u5411\u91cf\u4e2d&#xff1a;<\/p>\n<p> <span class=\"token punctuation\">[<\/span><span class=\"token number\">0,0<\/span>,0,0,0,0,0,1,1,1,1,1<span class=\"token punctuation\">]<\/span>\n <\/li>\n<li>\n<p>\u7efc\u4e0a\u6240\u8ff0&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260123051637-6973043595d60.webp\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<\/li>\n<\/ul>\n<h4>3.4 \u5c40\u9650\u6027<\/h4>\n<p>\u200b \u8bcd\u888b\u6a21\u578b<font color=\"red\">\u4ec5\u80fd\u53cd\u6620\u6587\u672c\u4e2d\u8bcd\u51fa\u73b0\u7684\u9891\u7387<\/font>&#xff0c;\u800c<font color=\"red\">\u5ffd\u7565\u4e86\u8bed\u8a00\u7684\u7ed3\u6784\u4e0e\u8bed\u4e49\u4fe1\u606f<\/font>&#xff0c;\u4e3b\u8981\u5c40\u9650\u5982\u4e0b&#xff1a;<\/p>\n<ul>\n<li>\u5ffd\u7565\u8bcd\u5e8f&#xff1a;\u4f8b\u5982&#xff0c;\u201cLearning start now\u201d \u4e0e \u201cNow start learning\u201d \u5728 BoW \u8868\u793a\u4e2d\u5b8c\u5168\u76f8\u540c&#xff0c;\u65e0\u6cd5\u4f53\u73b0\u8bed\u5e8f\u5dee\u5f02\u3002<\/li>\n<li>\u5ffd\u7565\u8bed\u4e49\u5dee\u5f02&#xff1a;\u4f8b\u5982&#xff0c;\u201cgood practice\u201d \u4e0e \u201cbad practice\u201d \u7684\u7ed3\u6784\u4e00\u81f4&#xff0c;\u4f46\u8bed\u4e49\u76f8\u53cd\u3002<\/li>\n<li>\u5927\u5c0f\u5199\u654f\u611f&#xff1a;\u5982 \u201cLearning\u201d \u4e0e \u201clearning\u201d \u542b\u4e49\u76f8\u540c&#xff0c;\u5374\u88ab\u89c6\u4e3a\u4e24\u4e2a\u4e0d\u540c\u7684\u8bcd\u3002<\/li>\n<li>\u5305\u542b\u65e0\u610f\u4e49\u7b26\u53f7&#xff1a;\u6807\u70b9\u7b26\u53f7&#xff08;\u5982\u9017\u53f7 \u201c,\u201d&#xff09;\u4f1a\u88ab\u5f53\u4f5c\u72ec\u7acb token \u52a0\u5165\u8bcd\u6c47\u8868&#xff0c;\u589e\u52a0\u566a\u58f0\u5374\u65e0\u5b9e\u9645\u4fe1\u606f\u3002<\/li>\n<\/ul>\n<p>\u56e0\u6b64&#xff0c;\u8bcd\u888b\u6a21\u578b\u4ec5\u5c06\u8bed\u8a00\u89c6\u4e3a\u4e00\u4e2a\u51e0\u4e4e\u5b57\u9762\u610f\u4e49\u4e0a\u7684\u201c\u8bcd\u888b\u201d&#xff0c;\u65e0\u6cd5\u6355\u6349\u4e0a\u4e0b\u6587\u4e0e\u8bed\u4e49\u5173\u7cfb\u3002 \u8fd9\u4e00\u5c40\u9650\u6b63\u662f TF-IDF \u4e0e\u540e\u7eed\u8bcd\u5411\u91cf\u6a21\u578b&#xff08;\u5982 Word2Vec\u3001GloVe&#xff09;\u51fa\u73b0\u7684\u52a8\u673a\u3002<\/p>\n<h3>\u56db\u3001BoWs\u5b9e\u73b0<\/h3>\n<p>\u200b sklearn\u7684CountVectorizer\u7c7b\u53ef\u4ee5\u5b9e\u73b0Bag Of Words\u7684\u529f\u80fd\u3002<\/p>\n<p><span class=\"token keyword\">from<\/span> sklearn<span class=\"token punctuation\">.<\/span>feature_extraction<span class=\"token punctuation\">.<\/span>text <span class=\"token keyword\">import<\/span> CountVectorizer<\/p>\n<p>vectorizer <span class=\"token operator\">&#061;<\/span> CountVectorizer<span class=\"token punctuation\">(<\/span>max_features<span class=\"token operator\">&#061;<\/span>max_features<span class=\"token punctuation\">,<\/span> stop_words<span class=\"token operator\">&#061;<\/span>stop_words<span class=\"token punctuation\">)<\/span><br \/>\nX_train <span class=\"token operator\">&#061;<\/span> vectorizer<span class=\"token punctuation\">.<\/span>fit_transform<span class=\"token punctuation\">(<\/span>train_texts<span class=\"token punctuation\">)<\/span><br \/>\nX_test <span class=\"token operator\">&#061;<\/span> vectorizer<span class=\"token punctuation\">.<\/span>transform<span class=\"token punctuation\">(<\/span>test_texts<span class=\"token punctuation\">)<\/span><\/p>\n<h4>1. \u53c2\u6570\u8bf4\u660e<\/h4>\n<table>\n<tr>\u53c2\u6570\u7c7b\u578b\u9ed8\u8ba4\u503c\u4f5c\u7528 \/ \u63cf\u8ff0<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">max_features<\/td>\n<td align=\"center\">int \u6216 None<\/td>\n<td align=\"center\">None<\/td>\n<td align=\"center\">\u9650\u5236\u8bcd\u8868\u5927\u5c0f\u3002\u5bf9\u6240\u6709\u8bcd\u7684 \u8bcd\u9891&#xff08;term frequency&#xff09; \u6392\u5e8f&#xff0c;\u53d6\u524d max_features \u4e2a\u4f5c\u4e3a\u5173\u952e\u8bcd\u96c6\u5408\u3002\u4f8b\u5982 max_features&#061;10000 \u8868\u793a\u53ea\u4fdd\u7559\u524d 10,000 \u4e2a\u9ad8\u9891\u8bcd\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">stop_words<\/td>\n<td align=\"center\">string\/list\/None<\/td>\n<td align=\"center\">None<\/td>\n<td align=\"center\">\u53bb\u9664\u505c\u7528\u8bcd\u3002\u4f8b\u5982 stop_words&#061;&#039;english&#039; \u81ea\u52a8\u53bb\u6389\u82f1\u6587\u5e38\u7528\u505c\u7528\u8bcd\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">ngram_range<\/td>\n<td align=\"center\">tuple (min_n, max_n)<\/td>\n<td align=\"center\">(1, 1)<\/td>\n<td align=\"center\">\u63a7\u5236 n-gram \u8303\u56f4\u3002\u9ed8\u8ba4 (1,1) \u53ea\u4fdd\u7559 unigram&#xff08;\u5355\u8bcd&#xff09;&#xff0c; (1,2) \u8868\u793a\u4fdd\u7559 unigram &#043; bigram&#xff08;\u4e24\u8bcd\u7ec4\u5408&#xff09;\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">lowercase<\/td>\n<td align=\"center\">bool<\/td>\n<td align=\"center\">True<\/td>\n<td align=\"center\">\u662f\u5426\u5c06\u6587\u672c\u8f6c\u6362\u4e3a\u5c0f\u5199\u3002\u901a\u5e38\u4fdd\u6301 True \u4ee5\u51cf\u5c11\u8bcd\u8868\u5197\u4f59\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">min_df<\/td>\n<td align=\"center\">int \/ float<\/td>\n<td align=\"center\">1<\/td>\n<td align=\"center\">\u6700\u5c0f\u6587\u6863\u9891\u7387\u3002\u8bcd\u8bed\u81f3\u5c11\u51fa\u73b0\u5728 min_df \u4e2a\u6587\u6863\u4e2d\u624d\u4f1a\u88ab\u4fdd\u7559\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">max_df<\/td>\n<td align=\"center\">int \/ float<\/td>\n<td align=\"center\">1.0<\/td>\n<td align=\"center\">\u6700\u5927\u6587\u6863\u9891\u7387\u3002\u8bcd\u8bed\u82e5\u51fa\u73b0\u5728\u8d85\u8fc7 max_df \u4e2a\u6587\u6863\u4e2d&#xff08;\u6216\u6bd4\u4f8b&#xff09;&#xff0c;\u5219\u88ab\u5ffd\u7565\u3002\u5e38\u7528\u6765\u53bb\u6389\u9ad8\u9891\u8bcd\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">token_pattern<\/td>\n<td align=\"center\">string<\/td>\n<td align=\"center\">r&#034;(?u)\\\\b\\\\w\\\\w&#043;\\\\b&#034;<\/td>\n<td align=\"center\">\u6b63\u5219\u8868\u8fbe\u5f0f&#xff0c;\u7528\u4e8e\u8bc6\u522b\u8bcd\u8bed\u8fb9\u754c\u3002\u9ed8\u8ba4\u5339\u914d\u81f3\u5c11\u4e24\u4e2a\u5b57\u7b26\u7684\u5355\u8bcd\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">analyzer<\/td>\n<td align=\"center\">string\/callable<\/td>\n<td align=\"center\">\u2018word\u2019<\/td>\n<td align=\"center\">\u6307\u5b9a\u5206\u6790\u5bf9\u8c61&#xff1a;&#039;word&#039; \u6309\u5355\u8bcd\u5206\u8bcd&#xff0c;&#039;char&#039; \u6309\u5b57\u7b26&#xff0c;&#039;char_wb&#039; \u6309\u5b57\u7b26\u4e14\u53ea\u8003\u8651\u5355\u8bcd\u8fb9\u754c\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>2. fit&#xff1a;\u7edf\u8ba1\u8bad\u7ec3\u6587\u672c\u4e2d\u6240\u6709\u8bcd\u51fa\u73b0\u7684\u9891\u7387<\/h4>\n<p>\u200b \u6839\u636e max_features \u548c stop_words \u751f\u6210\u4e00\u4e2a \u8bcd\u6c47\u8868&#xff08;vocabulary&#xff09;\u3002\u8bcd\u6c47\u8868\u91cc\u6bcf\u4e2a\u8bcd\u5bf9\u5e94\u4e00\u4e2a\u7d22\u5f15&#xff0c;\u6bd4\u5982&#xff1a;<\/p>\n<p><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#039;apple&#039;<\/span><span class=\"token builtin class-name\">:<\/span> <span class=\"token number\">0<\/span>, <span class=\"token string\">&#039;banana&#039;<\/span><span class=\"token builtin class-name\">:<\/span> <span class=\"token number\">1<\/span>, <span class=\"token string\">&#039;orange&#039;<\/span><span class=\"token builtin class-name\">:<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. transform&#xff1a;\u628a\u6d4b\u8bd5\u6587\u672c\u4e5f\u8f6c\u6362\u6210\u540c\u6837\u7ef4\u5ea6\u7684\u8bcd\u9891\u5411\u91cf<\/h4>\n<ul>\n<li>\u4f7f\u7528\u5df2\u6709\u8bcd\u6c47\u8868&#xff0c;\u628a\u65b0\u6587\u672c\u6620\u5c04\u6210\u5411\u91cf<\/li>\n<li>\u4f8b\u5982&#xff1a;<\/li>\n<\/ul>\n<p>test_texts <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;apple orange&#034;<\/span><span class=\"token punctuation\">]<\/span><br \/>\nX_test <span class=\"token operator\">&#061;<\/span><br \/>\n<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span> <span class=\"token number\">0<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>\u200b \u6ce8\u610f&#xff0c;\u5982\u679c\u6d4b\u8bd5\u6587\u672c\u91cc\u6709\u8bad\u7ec3\u96c6\u4e2d\u6ca1\u6709\u51fa\u73b0\u7684\u8bcd&#xff0c;\u5b83\u4eec\u4f1a\u88ab \u5ffd\u7565&#xff08;\u4e0d\u4f1a\u589e\u52a0\u65b0\u7ef4\u5ea6&#xff09;\u3002<\/p>\n<h3>\u4e94\u3001BoW \u4e0e\u73b0\u4ee3 LLM \u7684\u5173\u7cfb<\/h3>\n<p>BoW\u5176\u5b9e\u662f\u8bed\u8a00\u8868\u793a\u6f14\u8fdb\u7684\u7b2c\u4e00\u6b65<\/p>\n<h4>5.1 \u4ece BoW \u5230 LLM&#xff1a;\u8bed\u8a00\u8868\u793a\u7684\u6280\u672f\u6f14\u5316\u8def\u5f84<\/h4>\n<p>\u200b \u4ece\u5386\u53f2\u89c6\u89d2\u770b&#xff0c;BoW \u5e76\u4e0d\u662f\u201c\u88ab\u6dd8\u6c70\u7684\u65e7\u6280\u672f\u201d&#xff0c;\u800c\u662f\u73b0\u4ee3\u5927\u6a21\u578b\u8bed\u8a00\u8868\u793a\u4f53\u7cfb\u7684\u8d77\u70b9\u3002<\/p>\n<ul>\n<li>\u8bed\u8a00\u8868\u793a\u65b9\u6cd5\u5927\u81f4\u7ecf\u5386\u4e86\u4ee5\u4e0b\u9636\u6bb5&#xff1a;<\/li>\n<\/ul>\n<table>\n<tr>\u9636\u6bb5\u8868\u793a\u65b9\u5f0f\u6838\u5fc3\u601d\u60f3<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">BoW \/ TF-IDF<\/td>\n<td align=\"center\">\u7a00\u758f\u8bcd\u9891\u5411\u91cf<\/td>\n<td align=\"center\">\u7edf\u8ba1\u8bcd\u51fa\u73b0<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">Word2Vec \/ GloVe<\/td>\n<td align=\"center\">\u7a20\u5bc6\u8bcd\u5411\u91cf<\/td>\n<td align=\"center\">\u5b66\u4e60\u8bcd\u8bed\u8bed\u4e49\u7a7a\u95f4<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">RNN \/ LSTM<\/td>\n<td align=\"center\">\u5e8f\u5217\u6a21\u578b<\/td>\n<td align=\"center\">\u5efa\u6a21\u8bcd\u5e8f<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">Transformer<\/td>\n<td align=\"center\">\u6ce8\u610f\u529b\u673a\u5236<\/td>\n<td align=\"center\">\u5efa\u6a21\u957f\u8ddd\u79bb\u4f9d\u8d56<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">LLM<\/td>\n<td align=\"center\">\u5927\u89c4\u6a21\u9884\u8bad\u7ec3<\/td>\n<td align=\"center\">\u5b66\u4e60\u8bed\u8a00\u7684\u9690\u5f0f\u6982\u7387\u7ed3\u6784<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u200b \u53ef\u4ee5\u770b\u5230&#xff0c;BoW \u662f\u7b2c\u4e00\u4e2a\u5c06\u201c\u6587\u672c \u2192 \u6570\u503c\u5411\u91cf\u201d\u7684\u5de5\u7a0b\u53ef\u884c\u65b9\u6848&#xff0c;\u6ca1\u6709\u5b83&#xff0c;\u5c31\u6ca1\u6709\u540e\u7eed\u7684\u8bcd\u5411\u91cf\u548c Transformer \u8f93\u5165\u5f62\u5f0f\u3002<\/p>\n<h4>5.2 \u4e3a\u4ec0\u4e48\u8bf4 BoW \u4e0d\u662f\u201c\u5dee\u6a21\u578b\u201d&#xff0c;\u800c\u662f\u201c\u65f6\u4ee3\u6700\u4f18\u89e3\u201d<\/h4>\n<p>\u200b \u5f88\u591a\u73b0\u4ee3 NLP \u6559\u7a0b\u4f1a\u628a BoW \u63cf\u8ff0\u4e3a\u201c\u539f\u59cb\u3001\u7b80\u5355\u3001\u6548\u679c\u5dee\u201d&#xff0c;\u8fd9\u79cd\u8bf4\u6cd5\u5728\u5de5\u7a0b\u53f2\u4e0a\u662f\u4e0d\u51c6\u786e\u7684\u3002<\/p>\n<h5>(1) \u8ba1\u7b97\u8d44\u6e90\u9650\u5236\u51b3\u5b9a\u4e86\u6a21\u578b\u5f62\u5f0f<\/h5>\n<ul>\n<li>\n<p>\u5728 BoW \u6d41\u884c\u7684\u5e74\u4ee3&#xff08;1990\u20132010&#xff09;&#xff0c;\u90a3\u65f6&#xff1a;<\/p>\n<ul>\n<li>GPU \u5c1a\u672a\u666e\u53ca<\/li>\n<li>\u6df1\u5ea6\u795e\u7ecf\u7f51\u7edc\u8bad\u7ec3\u6210\u672c\u6781\u9ad8<\/li>\n<li>\u5927\u89c4\u6a21\u8bed\u6599\u4e0d\u53ef\u83b7\u5f97<\/li>\n<li>\u5206\u5e03\u5f0f\u8bad\u7ec3\u57fa\u7840\u8bbe\u65bd\u4e0d\u5b58\u5728<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5728\u8fd9\u79cd\u73af\u5883\u4e0b&#xff1a;<\/p>\n<ul>\n<li>\u7a20\u5bc6\u5411\u91cf\u8bad\u7ec3\u51e0\u4e4e\u4e0d\u53ef\u884c<\/li>\n<li>Transformer \u5b8c\u5168\u65e0\u6cd5\u8bad\u7ec3<\/li>\n<li>BoW \u662f\u552f\u4e00\u53ef\u5de5\u4e1a\u5316\u843d\u5730\u7684\u6587\u672c\u8868\u793a\u65b9\u5f0f<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h5>(2) \u5728\u5f88\u591a\u4efb\u52a1\u4e0a&#xff0c;BoW \u81f3\u4eca\u4ecd\u7136\u662f\u5f3a\u57fa\u7ebf<\/h5>\n<ul>\n<li>\n<p>\u5373\u4f7f\u5728\u4eca\u5929&#xff0c;\u6587\u672c\u5206\u7c7b\u3001\u4fe1\u606f\u68c0\u7d22\u3001\u641c\u7d22\u6392\u5e8f\u3001\u63a8\u8350\u7cfb\u7edf\u7279\u5f81\u5de5\u7a0b&#xff0c;BoW \/ TF-IDF &#043; \u7ebf\u6027\u6a21\u578b\u4ecd\u7136\u662f\u5f3a\u57fa\u7ebf&#xff0c;\u4e14\u6210\u672c\u6781\u4f4e\u3002<\/p>\n<\/li>\n<li>\n<p>\u5728\u5de5\u4e1a\u754c\u5e38\u89c1\u7ecf\u9a8c\u662f&#xff1a;\u4e00\u4e2a\u8c03\u4f18\u826f\u597d\u7684 TF-IDF &#043; Logistic Regression&#xff0c;\u5f80\u5f80\u80fd\u51fb\u8d25\u4e00\u4e2a\u6ca1\u6709\u8c03\u53c2\u7684\u5c0f\u578b\u795e\u7ecf\u7f51\u7edc\u6a21\u578b\u3002<\/p>\n<\/li>\n<\/ul>\n<h4>5.3 BoW \u4e0e\u73b0\u4ee3 LLM \u7684\u672c\u8d28\u5dee\u5f02<\/h4>\n<p>\u200b \u4ece\u6570\u5b66\u672c\u8d28\u4e0a\u770b&#xff0c;BoW \u548c LLM \u7684\u533a\u522b\u662f\u7edf\u8ba1\u9636\u6570\u4e0e\u7ed3\u6784\u5efa\u6a21\u80fd\u529b&#xff1a;<\/p>\n<table>\n<tr>\u6a21\u578b\u5efa\u6a21\u80fd\u529b\u8868\u793a\u7c7b\u578b<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">BoW<\/td>\n<td align=\"center\">\u4e00\u9636\u7edf\u8ba1&#xff08;\u8bcd\u9891&#xff09;<\/td>\n<td align=\"center\">\u7a00\u758f\u5411\u91cf<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">Word2Vec<\/td>\n<td align=\"center\">\u4e8c\u9636\u5171\u73b0\u7edf\u8ba1<\/td>\n<td align=\"center\">\u7a20\u5bc6\u5d4c\u5165<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">Transformer<\/td>\n<td align=\"center\">\u9ad8\u9636\u6761\u4ef6\u6982\u7387<\/td>\n<td align=\"center\">\u5e8f\u5217\u9690\u7a7a\u95f4<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">LLM<\/td>\n<td align=\"center\">\u5168\u5c40\u8bed\u8a00\u5206\u5e03<\/td>\n<td align=\"center\">\u9690\u5f0f\u4e16\u754c\u6a21\u578b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>\n<p>BoW \u662f<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          P<\/p>\n<p>          (<\/p>\n<p>          w<\/p>\n<p>          )<\/p>\n<p>         P(w)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">P<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0269em\">w<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span><\/p>\n<\/li>\n<li>\n<p>LLM \u662f&#xff1a; <span class=\"katex--display\"><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>           P<\/p>\n<p>           (<\/p>\n<p>            w<\/p>\n<p>            t<\/p>\n<p>           \u2223<\/p>\n<p>            w<\/p>\n<p>             &lt;<\/p>\n<p>             t<\/p>\n<p>           ,<\/p>\n<p>           context<\/p>\n<p>           )<\/p>\n<p>           P(w_t|w_{&lt;t}, \\\\text{context}) <\/p>\n<p>       <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">P<\/span><span class=\"mopen\">(<\/span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.0269em\">w<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.2806em\"><span class=\"\" style=\"top: -2.55em;margin-left: -0.0269em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">t<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.15em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mord\">\u2223<\/span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.0269em\">w<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.2806em\"><span class=\"\" style=\"top: -2.55em;margin-left: -0.0269em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mrel mtight\">&lt;<\/span><span class=\"mord mathnormal mtight\">t<\/span><\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.1774em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord text\"><span class=\"mord\">context<\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span><\/span> \u672c\u8d28\u4e0a&#xff0c;LLM \u662f BoW \u7684\u9ad8\u9636\u6761\u4ef6\u6982\u7387\u6269\u5c55\u3002<\/p>\n<\/li>\n<\/ul>\n<h4>5.4 \u4ece\u5de5\u7a0b\u89d2\u5ea6\u770b&#xff1a;LLM \u4ecd\u7136\u7ee7\u627f\u4e86 BoW \u7684\u601d\u60f3<\/h4>\n<p>\u200b \u5c3d\u7ba1 Transformer \u8868\u9762\u4e0a\u975e\u5e38\u590d\u6742&#xff0c;\u4f46\u5728\u5e95\u5c42LLM \u4ecd\u7136\u9700\u8981&#xff1a;<\/p>\n<ul>\n<li>\n<p>Tokenization&#xff08;\u5206\u8bcd&#xff09;<\/p>\n<\/li>\n<li>\n<p>Vocabulary&#xff08;\u8bcd\u8868&#xff09;<\/p>\n<\/li>\n<li>\n<p>Token ID \u5411\u91cf\u5316<\/p>\n<\/li>\n<li>\n<p>\u7a00\u758f\u2192\u7a20\u5bc6\u5d4c\u5165\u6620\u5c04<\/p>\n<p>\u8fd9\u6837\u770b\u6765&#xff0c;BoW \u7684\u601d\u60f3\u4ecd\u7136\u5b58\u5728\u4e8e embedding lookup \u8868\u4e2d&#xff0c;\u53ea\u662f\u88ab\u795e\u7ecf\u7f51\u7edc\u201c\u8f6f\u5316\u201d\u4e86\u3002<\/p>\n<\/li>\n<\/ul>\n<h4>5.5 \u4e3a\u4ec0\u4e48\u8bf4 BoW \u662f NLP \u7684\u201c\u725b\u987f\u529b\u5b66\u201d<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260123051637-69730435ae414.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u200b \u53ef\u4ee5\u7528\u4e00\u4e2a\u7269\u7406\u5b66\u7c7b\u6bd4&#xff1a;<\/p>\n<table>\n<tr>NLP\u7269\u7406\u5b66<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">BoW<\/td>\n<td align=\"center\">\u725b\u987f\u529b\u5b66<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">Word2Vec<\/td>\n<td align=\"center\">\u7ecf\u5178\u7edf\u8ba1\u7269\u7406<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">Transformer<\/td>\n<td align=\"center\">\u76f8\u5bf9\u8bba<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">LLM<\/td>\n<td align=\"center\">\u91cf\u5b50\u573a\u8bba\u7ea7\u590d\u6742\u7cfb\u7edf<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u200b \u725b\u987f\u529b\u5b66\u5e76\u6ca1\u6709\u201c\u8fc7\u65f6\u201d&#xff0c;\u53ea\u662f\u9002\u7528\u8303\u56f4\u6709\u9650\u3002\u540c\u7406&#xff0c;BoW \u4e0d\u662f\u9519\u8bef\u6a21\u578b&#xff0c;\u800c\u662f\u5728\u4f4e\u590d\u6742\u5ea6\u8bed\u8a00\u5efa\u6a21\u4e2d\u7684\u6700\u4f18\u5de5\u7a0b\u9009\u62e9\u3002<\/p>\n<h4>5.6 BoW \u7684\u601d\u60f3\u5728\u73b0\u4ee3\u7cfb\u7edf\u4e2d\u7684\u9690\u79d8\u590d\u6d3b<\/h4>\n<p>\u200b \u6709\u8da3\u7684\u662f&#xff0c;\u5f88\u591a\u73b0\u4ee3 LLM \u7cfb\u7edf\u53c8\u56de\u5f52\u4e86\u201c\u8bcd\u9891\u601d\u60f3\u201d&#xff1a;<\/p>\n<ul>\n<li>\n<p>BM25 \u4ecd\u7136\u662f\u641c\u7d22\u5f15\u64ce\u6838\u5fc3<\/p>\n<\/li>\n<li>\n<p>Hybrid Search &#061; BM25 &#043; Embedding<\/p>\n<\/li>\n<li>\n<p>RAG \u7cfb\u7edf\u4e2d\u4ecd\u4f7f\u7528 TF-IDF \/ BM25 \u53ec\u56de<\/p>\n<\/li>\n<li>\n<p>Prompt caching \/ prefix caching \u672c\u8d28\u662f\u7edf\u8ba1\u8bed\u8a00\u7247\u6bb5\u590d\u7528<\/p>\n<p>\u6df1\u5ea6\u6a21\u578b\u5e76\u6ca1\u6709\u53d6\u4ee3\u7edf\u8ba1\u6a21\u578b&#xff0c;\u800c\u662f\u4e0e\u4e4b\u53e0\u52a0\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u516d\u3001\u603b\u7ed3<\/h3>\n<p>\u200b \u8bcd\u888b\u6a21\u578b\u5e76\u4e0d\u662f\u4e00\u4e2a\u201c\u843d\u540e\u7684\u6280\u672f\u201d&#xff0c;\u5b83\u662f\u73b0\u4ee3\u8bed\u8a00\u6a21\u578b\u4f53\u7cfb\u7684\u5de5\u7a0b\u539f\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u7b2c\u4e00\u6b21\u5b9e\u73b0\u6587\u672c \u2192 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