{"id":22052,"date":"2024-11-19T16:48:00","date_gmt":"2024-11-19T08:48:00","guid":{"rendered":"http:\/\/139.9.1.231\/?p=22052"},"modified":"2024-11-19T16:48:01","modified_gmt":"2024-11-19T08:48:01","slug":"transformer-addtoken","status":"publish","type":"post","link":"http:\/\/139.9.1.231\/index.php\/2024\/11\/19\/transformer-addtoken\/","title":{"rendered":"Transformers \u6a21\u578b\u8bcd\u8868\u4e2d\u6dfb\u52a0\u65b0 token"},"content":{"rendered":"\n<p>\u5728\u4f7f\u7528\u9884\u8bad\u7ec3\u6a21\u578b\u65f6\uff0c\u6211\u4eec\u6709\u65f6\u9700\u8981\u4f7f\u7528\u4e00\u4e9b\u81ea\u5b9a\u4e49 token \u6765\u589e\u5f3a\u8f93\u5165\uff0c\u4f8b\u5982\u4f7f\u7528&nbsp;<code>[ENT_START]<\/code>&nbsp;\u548c&nbsp;<code>[ENT_END]<\/code>&nbsp;\u5728\u6587\u672c\u4e2d\u6807\u8bb0\u51fa\u5b9e\u4f53\u3002\u7531\u4e8e\u81ea\u5b9a\u4e49 token \u5e76\u4e0d\u5728\u9884\u8bad\u7ec3\u6a21\u578b\u539f\u6765\u7684\u8bcd\u8868\u4e2d\uff0c\u56e0\u6b64\u76f4\u63a5\u8fd0\u7528\u5206\u8bcd\u5668 (Tokenizer) \u5904\u7406\u8f93\u5165\u5c31\u4f1a\u51fa\u73b0\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\u76f4\u63a5\u4f7f\u7528 BERT \u5206\u8bcd\u5668\u5904\u7406\u4e0b\u9762\u7684\u53e5\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from transformers import AutoTokenizer\n\ntokenizer = AutoTokenizer.from_pretrained(\"bert-base-cased\")\n\nsentence = 'Two &#91;ENT_START] cars &#91;ENT_END] collided in a &#91;ENT_START] tunnel &#91;ENT_END] this morning.'\nprint(tokenizer(sentence).tokens())\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;'&#91;CLS]', 'Two', '&#91;', 'E', '##NT', '_', 'ST', '##AR', '##T', ']', 'cars', '&#91;', 'E', '##NT', '_', 'E', '##ND', ']', 'collided', 'in', 'a', '&#91;', 'E', '##NT', '_', 'ST', '##AR', '##T', ']', 'tunnel', '&#91;', 'E', '##NT', '_', 'E', '##ND', ']', 'this', 'morning', '.', '&#91;SEP]']\n<\/code><\/pre>\n\n\n\n<p>\u7531\u4e8e\u5206\u8bcd\u5668\u65e0\u6cd5\u8bc6\u522b&nbsp;<code>[ENT_START]<\/code>&nbsp;\u548c&nbsp;<code>[ENT_END]<\/code>&nbsp;\uff0c\u5c06\u5b83\u4eec\u90fd\u5f53\u4f5c\u672a\u77e5\u5b57\u7b26\u5904\u7406\uff0c\u4f8b\u5982&nbsp;<code>[ENT_END]<\/code>&nbsp;\u88ab\u5207\u5206\u6210\u4e86&nbsp;<code>'['<\/code>\u3001<code>'E'<\/code>\u3001<code>'##NT'<\/code>\u3001<code>'_'<\/code>\u3001<code>'E'<\/code>\u3001<code>'##ND'<\/code>\u3001<code>']'<\/code>&nbsp;\u4e03\u4e2a token\uff0c\u5f88\u660e\u663e\u4e0d\u7b26\u5408\u6211\u4eec\u7684\u9884\u671f\u3002<\/p>\n\n\n\n<p>\u6b64\u5916\uff0c\u6709\u65f6\u6211\u4eec\u8fd8\u4f1a\u9047\u5230\u4e00\u4e9b\u9886\u57df\u76f8\u5173\u8bcd\u6c47\uff0c\u4f8b\u5982\u533b\u5b66\u9886\u57df\u7684\u6587\u672c\u901a\u5e38\u4f1a\u5305\u542b\u5927\u91cf\u7684\u533b\u5b66\u672f\u8bed\uff0c\u5b83\u4eec\u53ef\u80fd\u5e76\u4e0d\u5728\u6a21\u578b\u7684\u8bcd\u8868\u4e2d\uff08\u4f8b\u5982\u4e00\u4e9b\u672f\u8bed\u662f\u4f7f\u7528\u591a\u4e2a\u8bcd\u8bed\u7684\u7f29\u5199\u62fc\u63a5\u800c\u6210\uff09\uff0c\u8fd9\u65f6\u4e5f\u4f1a\u51fa\u73b0\u4e0a\u9762\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u6b64\u65f6\u6211\u4eec\u5c31\u9700\u8981\u5c06\u8fd9\u4e9b\u65b0 token \u6dfb\u52a0\u5230\u6a21\u578b\u7684\u8bcd\u8868\u4e2d\uff0c\u8ba9\u5206\u8bcd\u5668\u4e0e\u6a21\u578b\u53ef\u4ee5\u8bc6\u522b\u5e76\u5904\u7406\u8fd9\u4e9b token\u3002<\/p>\n\n\n\n<h2 id=\"\u6dfb\u52a0\u65b0-token\">\u6dfb\u52a0\u65b0 token<a><\/a><\/h2>\n\n\n\n<h3 id=\"\u6dfb\u52a0\u65b9\u6cd5\">\u6dfb\u52a0\u65b9\u6cd5<a><\/a><\/h3>\n\n\n\n<p>Huggingface \u7684 Transformers \u5e93\u63d0\u4f9b\u4e86\u4e24\u79cd\u65b9\u5f0f\u6765\u6dfb\u52a0\u65b0 token\uff0c\u5206\u522b\u662f\uff1a<\/p>\n\n\n\n<ul><li><strong><a href=\"https:\/\/huggingface.co\/docs\/transformers\/v4.25.1\/en\/internal\/tokenization_utils#transformers.SpecialTokensMixin.add_tokens\"><code>add_tokens()<\/code><\/a>&nbsp;\u6dfb\u52a0\u666e\u901a token\uff1a<\/strong>\u6dfb\u52a0\u65b0 token \u5217\u8868\uff0c\u5982\u679c token \u4e0d\u5728\u8bcd\u8868\u4e2d\uff0c\u5c31\u4f1a\u88ab\u6dfb\u52a0\u5230\u8bcd\u8868\u7684\u6700\u540e\u3002<code>tokenizer = AutoTokenizer.from_pretrained(\"bert-base-cased\") num_added_toks = tokenizer.add_tokens([\"new_tok1\", \"my_new-tok2\"]) print(\"We have added\", num_added_toks, \"tokens\") <\/code><code>We have added 2 tokens <\/code>\u4e3a\u4e86\u9632\u6b62 token \u5df2\u7ecf\u5305\u542b\u5728\u8bcd\u8868\u4e2d\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u9884\u5148\u5bf9\u65b0 token \u5217\u8868\u8fdb\u884c\u8fc7\u6ee4\uff1a<code>new_tokens = [\"new_tok1\", \"my_new-tok2\"] new_tokens = set(new_tokens) - set(tokenizer.vocab.keys()) tokenizer.add_tokens(list(new_tokens))<\/code><\/li><li><strong><a href=\"https:\/\/huggingface.co\/docs\/transformers\/v4.25.1\/en\/internal\/tokenization_utils#transformers.SpecialTokensMixin.add_special_tokens\"><code>add_special_tokens()<\/code><\/a>&nbsp;\u6dfb\u52a0\u7279\u6b8a token\uff1a<\/strong>\u6dfb\u52a0\u5305\u542b\u7279\u6b8a token \u7684\u5b57\u5178\uff0c\u952e\u503c\u4ece&nbsp;<code>bos_token<\/code>,&nbsp;<code>eos_token<\/code>,&nbsp;<code>unk_token<\/code>,&nbsp;<code>sep_token<\/code>,&nbsp;<code>pad_token<\/code>,&nbsp;<code>cls_token<\/code>,&nbsp;<code>mask_token<\/code>,&nbsp;<code>additional_special_tokens<\/code>&nbsp;\u4e2d\u9009\u62e9\u3002\u4e0e&nbsp;<code>add_tokens()<\/code>&nbsp;\u7c7b\u4f3c\uff0c\u5982\u679c token \u4e0d\u5728\u8bcd\u8868\u4e2d\uff0c\u5c31\u4f1a\u88ab\u6dfb\u52a0\u5230\u8bcd\u8868\u7684\u6700\u540e\u3002\u6dfb\u52a0\u540e\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7\u7279\u6b8a\u5c5e\u6027\u6765\u8bbf\u95ee\u8fd9\u4e9b token\uff0c\u4f8b\u5982&nbsp;<code>tokenizer.cls_token<\/code>&nbsp;\u5c31\u6307\u5411 cls token\u3002<code>tokenizer = AutoTokenizer.from_pretrained(\"bert-base-cased\") special_tokens_dict = {\"cls_token\": \"[MY_CLS]\"} num_added_toks = tokenizer.add_special_tokens(special_tokens_dict) print(\"We have added\", num_added_toks, \"tokens\") assert tokenizer.cls_token == \"[MY_CLS]\" <\/code><code>We have added 1 tokens <\/code>\u6211\u4eec\u4e5f\u53ef\u4ee5\u4f7f\u7528&nbsp;<code>add_tokens()<\/code>&nbsp;\u6dfb\u52a0\u7279\u6b8a token\uff0c\u53ea\u9700\u8981\u989d\u5916\u8bbe\u7f6e\u53c2\u6570&nbsp;<code>special_tokens=True<\/code>\uff1a<code>tokenizer = AutoTokenizer.from_pretrained(\"bert-base-uncased\") num_added_toks = tokenizer.add_tokens([\"[NEW_tok1]\", \"[NEW_tok2]\"]) num_added_toks = tokenizer.add_tokens([\"[NEW_tok3]\", \"[NEW_tok4]\"], special_tokens=True) print(\"We have added\", num_added_toks, \"tokens\") print(tokenizer('[NEW_tok1] Hello [NEW_tok2] [NEW_tok3] World [NEW_tok4]!').tokens()) <\/code><code>We have added 2 tokens ['[CLS]', '[new_tok1]', 'hello', '[new_tok2]', '[NEW_tok3]', 'world', '[NEW_tok4]', '!', '[SEP]'] <\/code>\u7279\u6b8a token \u7684\u6807\u51c6\u5316 (normalization) \u8fc7\u7a0b\u4e0e\u666e\u901a token \u6709\u4e00\u4e9b\u4e0d\u540c\uff0c\u6bd4\u5982\u4e0d\u4f1a\u88ab\u5c0f\u5199\u3002\u8fd9\u91cc\u6211\u4eec\u4f7f\u7528\u7684\u662f\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u7684 BERT \u6a21\u578b\uff0c\u56e0\u6b64\u5206\u8bcd\u540e\u6dfb\u52a0\u7684\u666e\u901a token&nbsp;<code>[NEW_tok1]<\/code>&nbsp;\u548c&nbsp;<code>[NEW_tok2]<\/code>&nbsp;\u90fd\u88ab\u5904\u7406\u4e3a\u4e86\u5c0f\u5199\uff0c\u800c\u7279\u6b8a token&nbsp;<code>[NEW_tok3]<\/code>&nbsp;\u548c&nbsp;<code>[NEW_tok4]<\/code>&nbsp;\u5219\u7ef4\u6301\u5927\u5199\uff0c\u4e0e&nbsp;<code>[CLS]<\/code>&nbsp;\u7b49\u81ea\u5e26\u7279\u6b8a token \u4fdd\u6301\u4e00\u81f4\u3002<\/li><\/ul>\n\n\n\n<p>\u5bf9\u4e8e\u4e4b\u524d\u7684\u4f8b\u5b50\uff0c\u5f88\u660e\u663e\u5b9e\u4f53\u6807\u8bb0\u7b26&nbsp;<code>[ENT_START]<\/code>&nbsp;\u548c&nbsp;<code>[ENT_END]<\/code>&nbsp;\u5c5e\u4e8e\u7279\u6b8a token\uff0c\u56e0\u6b64\u6309\u6dfb\u52a0\u7279\u6b8a token \u7684\u65b9\u5f0f\u8fdb\u884c\u3002\u5982\u679c\u4f7f\u7528&nbsp;<code>add_tokens()<\/code>&nbsp;\u5219\u9700\u8981\u989d\u5916\u8bbe\u7f6e&nbsp;<code>special_tokens=True<\/code>\uff0c\u6216\u8005\u4e5f\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528&nbsp;<code>add_special_tokens()<\/code>\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from transformers import AutoTokenizer\n\ntokenizer = AutoTokenizer.from_pretrained(\"bert-base-uncased\")\n\nnum_added_toks = tokenizer.add_tokens(&#91;'&#91;ENT_START]', '&#91;ENT_END]'], special_tokens=True)\n# num_added_toks = tokenizer.add_special_tokens({'additional_special_tokens': &#91;'&#91;ENT_START]', '&#91;ENT_END]']})\nprint(\"We have added\", num_added_toks, \"tokens\")\n\nsentence = 'Two &#91;ENT_START] cars &#91;ENT_END] collided in a &#91;ENT_START] tunnel &#91;ENT_END] this morning.'\n\nprint(tokenizer(sentence).tokens())\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>We have added 2 tokens\n&#91;'&#91;CLS]', 'two', '&#91;ENT_START]', 'cars', '&#91;ENT_END]', 'collided', 'in', 'a', '&#91;ENT_START]', 'tunnel', '&#91;ENT_END]', 'this', 'morning', '.', '&#91;SEP]']\n<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u5206\u8bcd\u5668\u6210\u529f\u5730\u5c06&nbsp;<code>[ENT_START]<\/code>&nbsp;\u548c&nbsp;<code>[ENT_END]<\/code>&nbsp;\u8bc6\u522b\u4e3a token\uff0c\u5e76\u4e14\u4f9d\u65e7\u4fdd\u6301\u5927\u5199\u3002<\/p>\n\n\n\n<h3 id=\"\u8c03\u6574-embedding-\u77e9\u9635\">\u8c03\u6574 embedding \u77e9\u9635<a><\/a><\/h3>\n\n\n\n<p><strong>\u6ce8\u610f\uff01\u65e0\u8bba\u4f7f\u7528\u54ea\u79cd\u65b9\u5f0f\u5411\u8bcd\u8868\u4e2d\u6dfb\u52a0\u65b0 token \u540e\uff0c\u90fd\u9700\u8981\u91cd\u7f6e\u6a21\u578b token embedding \u77e9\u9635\u7684\u5927\u5c0f<\/strong>\uff0c\u4e5f\u5c31\u662f\u5411\u77e9\u9635\u4e2d\u6dfb\u52a0\u65b0 token \u5bf9\u5e94\u7684 embedding\uff0c\u8fd9\u6837\u6a21\u578b\u624d\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\uff08\u5c06 token \u6620\u5c04\u5230\u5bf9\u5e94\u7684 embedding\uff09\u3002<\/p>\n\n\n\n<p>\u8be5\u64cd\u4f5c\u901a\u8fc7\u8c03\u7528\u9884\u8bad\u7ec3\u6a21\u578b\u7684&nbsp;<code>resize_token_embeddings()<\/code>&nbsp;\u51fd\u6570\u6765\u5b9e\u73b0\uff0c\u4f8b\u5982\u5bf9\u4e8e\u4e0a\u9762\u7684\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from transformers import AutoTokenizer, AutoModel\n\ntokenizer = AutoTokenizer.from_pretrained(\"bert-base-uncased\")\nmodel = AutoModel.from_pretrained(\"bert-base-uncased\")\n\nprint(len(tokenizer))\nnum_added_toks = tokenizer.add_tokens(&#91;'&#91;ENT_START]', '&#91;ENT_END]'], special_tokens=True)\nprint(\"We have added\", num_added_toks, \"tokens\")\nprint(len(tokenizer))\n\nmodel.resize_token_embeddings(len(tokenizer))\nprint(model.embeddings.word_embeddings.weight.size())\n\n# Randomly generated matrix\nprint(model.embeddings.word_embeddings.weight&#91;-2:, :])\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>30522\nWe have added 2 tokens\n30524\ntorch.Size(&#91;30524, 768])\n\ntensor(&#91;&#91;-0.0325, -0.0224,  0.0044,  ..., -0.0088, -0.0078, -0.0110],\n        &#91;-0.0005, -0.0167, -0.0009,  ...,  0.0110, -0.0282, -0.0013]],\n       grad_fn=&lt;SliceBackward0&gt;)\n<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u5728\u6dfb\u52a0\u4e86\u7279\u6b8a token&nbsp;<code>[ENT_START]<\/code>&nbsp;\u548c&nbsp;<code>[ENT_END]<\/code>&nbsp;\u4e4b\u540e\uff0c\u5206\u8bcd\u5668\u7684\u8bcd\u8868\u5927\u5c0f\u4ece 30522 \u589e\u52a0\u5230\u4e86 30524\uff0c\u5e76\u4e14\u6a21\u578b\u7684 token embedding \u77e9\u9635\u5927\u5c0f\u4e5f\u6210\u529f\u8c03\u6574\u4e3a\u4e86&nbsp;30524\u00d776830524\u00d7768\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u8fd8\u5c1d\u8bd5\u6253\u5370\u51fa\u65b0\u6dfb\u52a0 token \u5bf9\u5e94\u7684 embedding\u3002\u56e0\u4e3a\u65b0 token \u4f1a\u6dfb\u52a0\u5728\u8bcd\u8868\u7684\u672b\u5c3e\uff0c\u56e0\u6b64\u53ea\u9700\u6253\u5370\u51fa\u77e9\u9635\u6700\u540e\u4e24\u884c\u3002\u5982\u679c\u4f60\u91cd\u590d\u8fd0\u884c\u4e00\u4e0b\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u5c31\u4f1a\u53d1\u73b0\u6bcf\u6b21\u6253\u5370\u51fa\u7684&nbsp;<code>[ENT_START]<\/code>&nbsp;\u548c&nbsp;<code>[ENT_END]<\/code>&nbsp;\u7684 embedding \u662f\u4e0d\u540c\u7684\u3002\u8fd9\u662f\u56e0\u4e3a\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e9b<strong>\u65b0 token \u7684 embedding \u662f\u968f\u673a\u521d\u59cb\u5316\u7684<\/strong>\u3002<\/p>\n\n\n\n<h2 id=\"token-embedding-\u521d\u59cb\u5316\">token embedding \u521d\u59cb\u5316<a><\/a><\/h2>\n\n\n\n<p>\u5982\u679c\u6709\u5145\u5206\u7684\u8bad\u7ec3\u8bed\u6599\u5bf9\u6a21\u578b\u8fdb\u884c\u5fae\u8c03\u6216\u8005\u7ee7\u7eed\u9884\u8bad\u7ec3\uff0c\u90a3\u4e48\u5c06\u65b0\u6dfb\u52a0 token \u521d\u59cb\u5316\u4e3a\u968f\u673a\u5411\u91cf\u6ca1\u4ec0\u4e48\u95ee\u9898\u3002\u4f46\u662f\u5982\u679c\u8bad\u7ec3\u8bed\u6599\u8f83\u5c11\uff0c\u751a\u81f3\u662f\u53ea\u6709\u5f88\u5c11\u8bed\u6599\u7684 few-shot learning \u573a\u666f\u4e0b\uff0c\u8fd9\u79cd\u505a\u6cd5\u5c31\u53ef\u80fd\u5b58\u5728\u95ee\u9898\u3002\u7814\u7a76\u8868\u660e\uff0c\u5728\u8bad\u7ec3\u6570\u636e\u4e0d\u591f\u591a\u7684\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e9b\u65b0\u6dfb\u52a0 token \u7684 embedding \u53ea\u4f1a\u5728\u521d\u59cb\u503c\u9644\u8fd1\u5c0f\u5e45\u6ce2\u52a8\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5373\u4f7f\u7ecf\u8fc7\u8bad\u7ec3\uff0c\u5b83\u4eec\u7684\u503c\u4e8b\u5b9e\u4e0a\u8fd8\u662f\u968f\u673a\u7684\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u5728\u5f88\u591a\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u9700\u8981\u624b\u5de5\u521d\u59cb\u5316\u8fd9\u4e9b\u65b0 token \u7684 embedding\u3002\u5bf9\u4e8e Transformers \u5e93\u6765\u8bf4\uff0c\u53ef\u4ee5\u901a\u8fc7\u76f4\u63a5\u5bf9 embedding \u77e9\u9635\u8d4b\u503c\u6765\u5b9e\u73b0\u3002\u4f8b\u5982\u5bf9\u4e8e\u4e0a\u9762\u7684\u4f8b\u5b50\uff0c\u6211\u4eec\u5c06\u8fd9\u4e24\u4e2a\u65b0 token \u7684 embedding \u90fd\u521d\u59cb\u5316\u4e3a\u5168\u96f6\u5411\u91cf\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>with torch.no_grad():\n    model.embeddings.word_embeddings.weight&#91;-2:, :] = torch.zeros(&#91;2, model.config.hidden_size], requires_grad=True)\nprint(model.embeddings.word_embeddings.weight&#91;-2:, :])\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>tensor(&#91;&#91;0., 0., 0.,  ..., 0., 0., 0.],\n        &#91;0., 0., 0.,  ..., 0., 0., 0.]], grad_fn=&lt;SliceBackward0&gt;)\n<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f\uff0c\u521d\u59cb\u5316 embedding \u7684\u8fc7\u7a0b\u5e76\u4e0d\u53ef\u5bfc\uff0c\u56e0\u6b64\u8fd9\u91cc\u901a\u8fc7&nbsp;<code>torch.no_grad()<\/code>&nbsp;\u6682\u505c\u68af\u5ea6\u7684\u8ba1\u7b97\u3002<\/p>\n\n\n\n<h3 id=\"\u521d\u59cb\u5316\u4e3a\u5df2\u6709-token-\u7684\u503c\">\u521d\u59cb\u5316\u4e3a\u5df2\u6709 token \u7684\u503c<a><\/a><\/h3>\n\n\n\n<p>\u6bd4\u8f83\u5e38\u89c1\u7684\u64cd\u4f5c\u662f\u6839\u636e\u65b0\u6dfb\u52a0 token \u7684\u8bed\u4e49\uff0c\u5c06\u5176\u503c\u521d\u59cb\u5316\u4e3a\u8bad\u7ec3\u597d token \u7684 embedding\u3002\u4f8b\u5982\u5bf9\u4e8e\u4e0a\u9762\u7684\u4f8b\u5b50\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06&nbsp;<code>[ENT_START]<\/code>&nbsp;\u548c&nbsp;<code>[ENT_END]<\/code>&nbsp;\u7684\u503c\u90fd\u521d\u59cb\u5316\u4e3a\u201centity\u201d\u5bf9\u5e94\u7684 embedding\u3002\u56e0\u4e3a token id \u5c31\u662f token \u5728\u77e9\u9635\u4e2d\u7684\u7d22\u5f15\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7&nbsp;<code>weight[token_id]<\/code>&nbsp;\u53d6\u51fa\u201centity\u201d\u5bf9\u5e94\u7684 embedding\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>token_id = tokenizer.convert_tokens_to_ids('entity')\ntoken_embedding = model.embeddings.word_embeddings.weight&#91;token_id]\nprint(token_id)\n\nwith torch.no_grad():\n    for i in range(1, num_added_toks+1):\n        model.embeddings.word_embeddings.weight&#91;-i:, :] = token_embedding.clone().detach().requires_grad_(True)\nprint(model.embeddings.word_embeddings.weight&#91;-2:, :])\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>9178\ntensor(&#91;&#91;-0.0039, -0.0131, -0.0946,  ..., -0.0223,  0.0107, -0.0419],\n        &#91;-0.0039, -0.0131, -0.0946,  ..., -0.0223,  0.0107, -0.0419]],\n       grad_fn=&lt;SliceBackward0&gt;)\n<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\u6700\u7ec8\u7ed3\u679c\u7b26\u5408\u6211\u4eec\u7684\u9884\u671f\uff0c<code>[ENT_START]<\/code>&nbsp;\u548c&nbsp;<code>[ENT_END]<\/code>&nbsp;\u88ab\u521d\u59cb\u5316\u4e3a\u76f8\u540c\u7684 embedding\u3002<\/p>\n\n\n\n<p>\u53e6\u4e00\u79cd\u5e38\u89c1\u7684\u505a\u6cd5\u662f\u6839\u636e\u65b0 token \u7684\u8bed\u4e49\uff0c\u4f7f\u7528\u5bf9\u5e94\u7684\u63cf\u8ff0\u6587\u672c\u6765\u5b8c\u6210\u521d\u59cb\u5316\u3002\u4f8b\u5982\u5c06\u503c\u521d\u59cb\u5316\u4e3a\u63cf\u8ff0\u6587\u672c\u4e2d\u6240\u6709 token \u7684\u5e73\u5747\u503c\uff0c\u5047\u8bbe\u65b0 token\u00a0titi\u00a0\u7684\u63cf\u8ff0\u6587\u672c\u4e3a\u00a0wi,1,wi,2,\u2026,wi,nwi,1,wi,2,\u2026,wi,n\uff0c\u90a3\u4e48\u00a0titi\u00a0\u7684\u521d\u59cb\u5316 embedding \u4e3a\uff1a<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2024\/11\/image-47.png\" alt=\"\" class=\"wp-image-22055\" width=\"197\" height=\"60\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2024\/11\/image-47.png 348w, http:\/\/139.9.1.231\/wp-content\/uploads\/2024\/11\/image-47-300x91.png 300w\" sizes=\"(max-width: 197px) 100vw, 197px\" \/><\/figure><\/div>\n\n\n\n<p>\u8fd9\u91cc&nbsp;EE&nbsp;\u8868\u793a\u9884\u8bad\u7ec3\u6a21\u578b\u7684 token embedding \u77e9\u9635\u3002\u5bf9\u4e8e\u4e0a\u9762\u7684\u4f8b\u5b50\uff0c\u6211\u4eec\u53ef\u4ee5\u5206\u522b\u4e3a&nbsp;<code>[ENT_START]<\/code>&nbsp;\u548c&nbsp;<code>[ENT_END]<\/code>&nbsp;\u7f16\u5199\u5bf9\u5e94\u7684\u63cf\u8ff0\uff0c\u7136\u540e\u518d\u5bf9\u5b83\u4eec\u7684\u503c\u8fdb\u884c\u521d\u59cb\u5316\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>descriptions = &#91;'start of entity', 'end of entity']\n\nwith torch.no_grad():\n    for i, token in enumerate(reversed(descriptions), start=1):\n        tokenized = tokenizer.tokenize(token)\n        print(tokenized)\n        tokenized_ids = tokenizer.convert_tokens_to_ids(tokenized)\n        new_embedding = model.embeddings.word_embeddings.weight&#91;tokenized_ids].mean(axis=0)\n        model.embeddings.word_embeddings.weight&#91;-i, :] = new_embedding.clone().detach().requires_grad_(True)\nprint(model.embeddings.word_embeddings.weight&#91;-2:, :])\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;'end', 'of', 'entity']\n&#91;'start', 'of', 'entity']\ntensor(&#91;&#91;-0.0340, -0.0144, -0.0441,  ..., -0.0016,  0.0318, -0.0151],\n        &#91;-0.0060, -0.0202, -0.0312,  ..., -0.0084,  0.0193, -0.0296]],\n       grad_fn=&lt;SliceBackward0&gt;)\n<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u8fd9\u91cc\u6210\u529f\u5730\u5c06\u00a0<code>[ENT_START]<\/code>\u00a0\u521d\u59cb\u5316\u4e3a\u201cstart\u201d\u3001\u201cof\u201d\u3001\u201centity\u201d\u4e09\u4e2a token embedding \u7684\u5e73\u5747\u503c\uff0c\u5c06\u00a0<code>[ENT_END]<\/code>\u00a0\u521d\u59cb\u5316\u4e3a\u201cend\u201d\u3001\u201cof\u201d\u3001\u201centity\u201d embedding \u7684\u5e73\u5747\u503c\u3002<\/p>\n\n\n\n<h3>\u4fdd\u5b58\u65b0\u7684token\u8bcd\u6c47\u8868\u548c\u6a21\u578b\u6743\u91cd<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\"># \u4fdd\u5b58tokenizer\ntokenizer.save_pretrained(save_directory)\n# \u4fdd\u5b58model\nmodel.save_pretrained(save_directory)<\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u4f7f\u7528\u9884\u8bad\u7ec3\u6a21\u578b\u65f6\uff0c\u6211\u4eec\u6709\u65f6\u9700\u8981\u4f7f\u7528\u4e00\u4e9b\u81ea\u5b9a\u4e49 token \u6765\u589e\u5f3a\u8f93\u5165\uff0c\u4f8b\u5982\u4f7f\u7528&nbsp;[ENT_STAR &hellip; <a href=\"http:\/\/139.9.1.231\/index.php\/2024\/11\/19\/transformer-addtoken\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">Transformers \u6a21\u578b\u8bcd\u8868\u4e2d\u6dfb\u52a0\u65b0 token<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[11,21,4],"tags":[],"_links":{"self":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/22052"}],"collection":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/comments?post=22052"}],"version-history":[{"count":8,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/22052\/revisions"}],"predecessor-version":[{"id":22061,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/22052\/revisions\/22061"}],"wp:attachment":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/media?parent=22052"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/categories?post=22052"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/tags?post=22052"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}