{"id":3759,"date":"2021-03-14T22:18:16","date_gmt":"2021-03-14T14:18:16","guid":{"rendered":"http:\/\/www.sniper97.cn\/?p=3759"},"modified":"2021-03-14T22:18:16","modified_gmt":"2021-03-14T14:18:16","slug":"%e3%80%90%e6%b7%b1%e5%ba%a6%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%e3%80%91bert%e5%a4%84%e7%90%86%e8%b6%85%e9%95%bf%e6%96%87%e6%9c%ac","status":"publish","type":"post","link":"http:\/\/www.sniper97.cn\/index.php\/note\/deep-learning\/note-deep-learning\/3759\/","title":{"rendered":"\u3010\u6df1\u5ea6\u5b66\u4e60\u7b14\u8bb0\u3011Bert\u5904\u7406\u8d85\u957f\u6587\u672c"},"content":{"rendered":"\n<p>\u4f17\u6240\u5468\u77e5\uff0cBert\u53ea\u80fd\u5904\u7406\u6700\u957f512\u957f\u5ea6\u7684\u6587\u672c\uff0c\u90a3\u4e48\u5982\u4f55\u5904\u7406\u8d85\u957f\u6587\u672c\u5462\uff1f<\/p>\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528nezha\uff0c\u56e0\u4e3a\u5b83\u662f\u57fa\u4e8e\u76f8\u5bf9\u4f4d\u7f6e\u7f16\u7801\u7684\u3002<\/p>\n\n\n<p>\u6211\u4eec\u8fd8\u53ef\u4ee5\u5c06Bert\u7684\u7edd\u5bf9\u4f4d\u7f6e\u7f16\u7801\u5904\u7406\u4e00\u4e0b\uff0c\u4f7f\u5176\u80fd\u591f\u5904\u7406\u8d85\u957f\u6587\u672c\u3002<\/p>\n\n\n<p>\u601d\u8def\u5982\u4e0b\uff1a<\/p>\n\n\n<p>\u6211\u4eec\u5c06\u8d85\u957f\u6587\u672c\u6620\u5c04\u5230\u591a\u5c42\uff08k\u4e3a\u6587\u672c\u7d22\u5f15\uff09\uff0c\u901a\u8fc7\u4f4d\u7f6e\u7f16\u7801pos(i)\u548cpos(j)\u6765\u786e\u5b9ak\u3002<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"516\" height=\"145\" src=\"\/wp-content\/uploads\/2021\/03\/\u56fe\u7247.png\" alt=\"\" class=\"wp-image-3760\" srcset=\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/03\/\u56fe\u7247.png 516w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/03\/\u56fe\u7247-300x84.png 300w\" sizes=\"(max-width: 516px) 100vw, 516px\" \/><\/figure><\/div>\n\n\n<p>\u901a\u8fc7\u4e00\u4e2a[0,1]\u7684\u8d85\u53c2 <em>\u03b1<\/em> \u6765\u5b9a\u4e49i\u548cj\u7684\u6bd4\u4f8b\uff08 <em>\u03b1<\/em> \u22600.5\uff0c\u5426\u5219\u65e0\u6cd5\u533a\u5206(i,j)\u548c(j,i)\uff09\u3002<\/p>\n\n\n<p>\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u5c06\u65b0\u7684\u4f4d\u7f6e\u7f16\u7801\u8bbe\u4e3a\uff1a<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"217\" height=\"30\" src=\"\/wp-content\/uploads\/2021\/03\/\u56fe\u7247-1.png\" alt=\"\" class=\"wp-image-3761\"\/><\/figure><\/div>\n\n\n<p>\u5176\u4e2d\uff0cu\u4e3aembedding\u7684\u539f\u59cb\u6570\u636e\uff08\u6682\u65f6\u8fd9\u4e48\u7406\u89e3\uff09\uff0cq\u4e3a\u65b0\u7684\u4f4d\u7f6e\u7f16\u7801\uff0c(i-1)*n+j=k\u3002<\/p>\n\n\n<p>\u5230\u8fd9\u91cc\u6bd4\u8f83\u597d\u7406\u89e3\uff0c\u4f46\u662f\u6211\u4eec\u8fd8\u6709\u4e2a\u95ee\u9898\uff1a<\/p>\n\n\n<p>\u7531\u4e8e\u6211\u4eec\u5e0c\u671b\u5728\u957f\u5ea6\u4e0d\u8db3512\u7684\u65f6\u5019\uff0cu\u548c\u539f\u59cb\u4f4d\u7f6e\u7f16\u7801\uff08&lt;512\uff09\u4e00\u81f4\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53i=1\u65f6\uff0cq\uff08\u65b0\u7684embedding\uff09\u548cp\uff08\u539f\u59cb512\u7684embedding\uff09\u662f\u76f8\u7b49\u7684\u3002\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u7b97\u51fau\u4e3a\uff1a<\/p>\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"539\" height=\"382\" src=\"\/wp-content\/uploads\/2021\/06\/\u56fe\u7247-2.png\" alt=\"\" class=\"wp-image-3847\" srcset=\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/06\/\u56fe\u7247-2.png 539w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/06\/\u56fe\u7247-2-300x213.png 300w\" sizes=\"(max-width: 539px) 100vw, 539px\" \/><\/figure>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"241\" height=\"50\" src=\"\/wp-content\/uploads\/2021\/03\/\u56fe\u7247-2.png\" alt=\"\" class=\"wp-image-3762\"\/><\/figure><\/div>\n\n\n<p>\u56e0\u6b64\uff0c\u5f53\u6211\u4eec\u53d6u\u4e3a\u4e0a\u5f0f\u65f6\uff0c\u5f53\u957f\u5ea6\u5c0f\u4e8e512\u548c\u539f\u59cbembedding\u4e00\u81f4\u3002\u5f53\u957f\u5ea6\u5927\u4e8e512\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u53d8\u6362\u83b7\u5f97\u65b0\u7684embedding\u3002<\/p>\n\n\n<p>\u5177\u4f53\u4ee3\u7801\u5b9e\u73b0\u4e3a\uff1a<\/p>\n\n\n<p>\u9996\u5148\u53d8\u6362p\u4e3au\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>embeddings = self.embeddings - alpha * self.embeddings[:1]\nembeddings = embeddings \/ (1 - alpha)<\/code><\/pre>\n\n\n<p>\u968f\u540e\u901a\u8fc7u\u8ba1\u7b97q\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>embeddings_x = K.gather(embeddings, position_ids \/\/ self.input_dim)\nembeddings_y = K.gather(embeddings, position_ids % self.input_dim)\nembeddings = alpha * embeddings_x + (1 - alpha) * embeddings_y<\/code><\/pre>\n\n\n<p>\u901a\u8fc7\u5b9e\u9a8c\u8868\u660e\uff0c <em>\u03b1<\/em> \u53d60.4\u65f6\u6548\u679c\u6700\u597d\u3002<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"346\" src=\"\/wp-content\/uploads\/2021\/03\/\u56fe\u7247-3.png\" alt=\"\" class=\"wp-image-3763\" srcset=\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/03\/\u56fe\u7247-3.png 450w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/03\/\u56fe\u7247-3-300x231.png 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/figure><\/div>\n\n\n<p>\u800c\u5b9e\u9a8c\u6548\u679c\u8868\u660e\uff0c\u5728\u5f88\u5c0f\u7684\u4ee3\u4ef7\u4e0b\uff0c\u6a21\u578b\u5c31\u80fd\u591f\u7406\u89e3\u8fd9\u79cd\u53d8\u6362\uff0c\u8fbe\u5230\u4e0e\u4e4b\u524d\uff08\u957f\u5ea6\u4e3a512\uff09\u76f8\u8fd1\u7684\u7ed3\u679c\u3002<\/p>\n\n\n<p>\u5f53\u7136\uff0c\u4ee3\u4ef7\u4e5f\u662f\u6709\u7684\uff0c\u7531\u4e8eattention\u7684\u957f\u5ea6\u589e\u52a0\uff0cattention\u53c8\u662fO(n2)\u7684\u7a7a\u95f4\u590d\u6742\u5ea6\uff0c\u56e0\u6b64\u663e\u5b58\u5360\u7528\u4e5f\u4f1a\u6709\u4e00\u4e9b\u589e\u52a0\u3002<\/p>\n\n\n<p>\u5b8c\u6574\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>alpha = 0.4 if self.hierarchical is True else self.hierarchical\nembeddings = self.embeddings - alpha * self.embeddings[:1]\nembeddings = embeddings \/ (1 - alpha)\nembeddings_x = K.gather(embeddings, position_ids \/\/ self.input_dim)\nembeddings_y = K.gather(embeddings, position_ids % self.input_dim)\nembeddings = alpha * embeddings_x + (1 - alpha) * embeddings_y<\/code><\/pre>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<p>\u611f\u8c22\u82cf\u5efa\u6797\u5927\u4f6c\u7684\u535a\u5ba2\uff0c\u672c\u6587\u4e3a\u9605\u8bfb<a rel=\"noreferrer noopener\" aria-label=\"\u539f\u6587\uff08\u5728\u65b0\u7a97\u53e3\u6253\u5f00\uff09\" href=\"https:\/\/kexue.fm\/archives\/7947\" target=\"_blank\">\u539f\u6587<\/a>\u65f6\u7684\u7b14\u8bb0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f17\u6240\u5468\u77e5\uff0cBert\u53ea\u80fd\u5904\u7406\u6700\u957f512\u957f\u5ea6\u7684\u6587\u672c\uff0c\u90a3\u4e48\u5982\u4f55\u5904\u7406\u8d85\u957f\u6587\u672c\u5462\uff1f \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528nezha\uff0c\u56e0 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[18,9],"tags":[31,37,39],"views":8480,"_links":{"self":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/3759"}],"collection":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/comments?post=3759"}],"version-history":[{"count":0,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/3759\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/media?parent=3759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/categories?post=3759"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/tags?post=3759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}