{"id":4265,"date":"2022-09-12T09:51:24","date_gmt":"2022-09-12T09:51:24","guid":{"rendered":"http:\/\/www.sniper97.cn\/?p=4265"},"modified":"2022-09-12T10:46:36","modified_gmt":"2022-09-12T10:46:36","slug":"%e3%80%90%e6%b7%b1%e5%ba%a6%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%e3%80%91seq2seq%e4%b8%ad%e7%9a%84%e6%9b%9d%e5%85%89%e5%81%8f%e5%b7%aeexposure-bias%e7%8e%b0%e8%b1%a1","status":"publish","type":"post","link":"http:\/\/www.sniper97.cn\/index.php\/note\/deep-learning\/note-deep-learning\/4265\/","title":{"rendered":"\u3010\u6df1\u5ea6\u5b66\u4e60\u7b14\u8bb0\u3011Seq2Seq\u4e2d\u7684\u66dd\u5149\u504f\u5dee(exposure bias)\u73b0\u8c61"},"content":{"rendered":"\n

\u5728Seq2Seq\u6a21\u578b\u7684\u8bad\u7ec3\u4e0e\u9a8c\u8bc1\u8fc7\u7a0b\u4e2d\uff0c\u7ecf\u5e38\u4f1a\u51fa\u73b0\u8f93\u51fa\u53e5\u548c\u8f93\u5165\u53e5\u5b50\u6709\u4e00\u4e9bgap\u6216\u8005\u660e\u663e\u4e0d\u7b26\u5408\u5e38\u8bc6\u7684\u60c5\u51b5\u51fa\u73b0\u3002\u8fd9\u79cd\u60c5\u51b5\u5f88\u6709\u53ef\u80fd\u662f\u56e0\u4e3aSeq2Seq\u7684exposure bias\u95ee\u9898\u3002\u6b64\u5916\uff0c\u5bf9\u4e8e\u9ad8\u9891\u7684\u5b89\u5168\u8bcd\u91cd\u590d\u51fa\u73b0\u6216\u8005\u91cd\u590d\u89e3\u7801\u7684\u95ee\u9898\uff0c\u57fa\u672c\u4e0a\u4e5f\u662f\u56e0\u4e3aexposure bias\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n

\u51fa\u73b0exposure bias\u7684\u4e3b\u8981\u539f\u56e0\u662f\u7531\u4e8e\u8bad\u7ec3\u9636\u6bb5\u91c7\u7528\u7684\u662fTeacher Forcing\uff0c\u800c\u624d\u6d4b\u8bc4\u6216\u8005\u751f\u6210\u65f6\uff0c\u6211\u4eec\u57fa\u672c\u90fd\u91c7\u7528\u8d2a\u5fc3\u6216\u8005beam search\u7684\u65b9\u6cd5\uff0c\u8fd9\u5c31\u9020\u6210\u4e86\u8bad\u7ec3\u548c\u6d4b\u8bc4\u4e0a\u7684\u4e00\u4e9bgap\u3002\u5728\u8bad\u7ec3\u9636\u6bb5\uff0c\u6a21\u578b\u603b\u662f\u80fd\u83b7\u53d6\u4e0a\u4e00\u6b65\u7684\u6b63\u786e\u7b54\u6848\u3002<\/p>\n\n\n\n

\u8fd9\u5c31\u50cf\u6211\u4eec\u5728\u4e0a\u5b66\u65f6\uff0c\u8001\u5e08\u5e26\u4f60\u505a\u9898\u5f88\u5bb9\u6613\u5c31\u505a\u51fa\u6765\uff0c\u56e0\u4e3a\u8001\u5e08\u6bcf\u4e00\u6b65\u5728\u5f15\u5bfc\u4f60\u65f6\uff0c\u4e0a\u4e00\u6b65\u90fd\u662f\u6b63\u786e\u7b54\u6848\uff0c\u800c\u5230\u4e86\u81ea\u5df1\u505a\u9898\u65f6\uff0c\u7531\u4e8e\u6ca1\u6709\u529e\u6cd5\u786e\u4fdd\u4e0a\u4e00\u6b65\u7684\u6b63\u786e\u6027\uff0c\u56e0\u6b64\u5c31\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9519\u8bef\u3002<\/p>\n\n\n\n

1.beam search<\/h2>\n\n\n\n

\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7beam search\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u7f13\u89e3\u8fd9\u4e00\u95ee\u9898\u3002<\/p>\n\n\n\n

\u5c31\u50cf\u4e0a\u5b66\u505a\u9898\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4e0d\u65ad\u7684\u8bd5\u9519\uff0c\u5f53\u505a\u5230\u8fd9\u4e00\u6b65\u53d1\u73b0\u60c5\u51b5\u4e0d\u592a\u5bf9\u65f6\uff0c\u53ca\u65f6\u4fee\u6539\u524d\u9762\u7684\u6b65\u9aa4\u3002\u800cbeam search\u5c31\u53ef\u4ee5\u8ba9\u6211\u4eec\u53ef\u4ee5\u7efc\u5408\u7684\u8003\u8651\u5f53\u524d\u6a21\u578b\u7684\u8f93\u51fa\uff0c\u5f53\u6a21\u578b\u5f53\u524d\u8f93\u51fa\u7684\u6982\u7387\u8f83\u4f4e\u65f6\uff0c\u5c31\u8f6c\u800c\u9009\u62e9\u5176\u4ed6\u6982\u7387\u66f4\u9ad8\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n

\u8fd8\u6709\u4e00\u79cd\u53ef\u4ee5\u7f13\u89e3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u6cd5\u5c31\u662f\u968f\u673a\u66ff\u6362decoder\u7684\u8f93\u5165\u8bcd\uff08oracle words\uff09\u3002<\/p>\n\n\n\n

2.\u66ff\u6362oracle words<\/h2>\n\n\n\n

\u8fd9\u4e2a\u65b9\u6cd5\u7684\u601d\u8def\u5c31\u50cf\u8bad\u7ec3language model\u4e00\u6837\uff0c\u968f\u673a\u66ff\u6362\u6389\u4e00\u4e9bdecoder\u7aef\u8f93\u5165\u7684\u8bcd\uff0c\u4ece\u800c\u83b7\u5f97\u66f4\u52a0\u4f18\u79c0\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n

\u8f93\u5165\u6a21\u578b\u65f6\uff0c\u5c06\u4e00\u5b9a\u6982\u7387\u7684token\u968f\u673a\u66ff\u6362\u6210\u5f53\u524d\u53e5\u5b50\u4e2d\u7684\u5176\u4ed6token\uff0c\u7136\u540e\u5728\u8ba1\u7b97loss\u65f6\uff0c\u4f9d\u7136\u4f7f\u7528\u771f\u5b9e\u53e5\u5b50\u4e0e\u9884\u6d4b\u7ed3\u679c\u8fdb\u884closs\u8ba1\u7b97\uff0c\u4ece\u800c\u8ba9\u6a21\u578b\u5177\u5907\u4e00\u5b9a\u7684\u201d\u7ea0\u9519\u201c\u80fd\u529b\uff0c\u56e0\u6b64\u6a21\u578b\u4e5f\u5c31\u66f4\u5bb9\u6613\u7684\u4f1a\u5728\u63a8\u7406\u9636\u6bb5\u53d1\u73b0\u4e4b\u524d\u7684\u201d\u9519\u8bef\u751f\u6210\u201c\u3002<\/p>\n\n\n\n

3.TeaForN<\/strong><\/h2>\n\n\n\n

\u6765\u81ea\u8bba\u6587 EMNLP 2020 TeaForN: Teacher-Forcing with N-grams<\/a>\uff0c\u4e3b\u8981\u601d\u8def\u662f\u4f9d\u7136\u662f\u89e3\u51b3\u524d\u77bb\u6027\u4e0d\u8db3\u7684\u95ee\u9898\uff0c\u5f3a\u5236\u6a21\u578b\u5728\u89e3\u7801\u7684t\u65f6\u523b\uff0c\u5f3a\u5236\u601d\u8003t+n\u65f6\u7684\u8f93\u51fa\uff0c\u76f8\u5f53\u4e8e\u5728\u8bad\u7ec3\u6d41\u7a0b\u4e2d\u5f15\u5165beam search\u7684\u601d\u8def\u3002<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

TeaForN\u4e3b\u8981\u901a\u8fc7\u4e0a\u56fe\u7684\u65b9\u5f0f\uff0c\u5c06n(3)\u4e2adecoder\u7684loss\u878d\u5408\u8d77\u6765\uff0c\u8fd9\u6837\u5728\u8ba1\u7b97$h^{(1)}_1$\u65f6\uff0c\u5c31\u4f1a\u878d\u5408$h^{(2)}_2$\u548c$h^{(3)}_3$\u7684loss\uff0c\u4e5f\u5c31\u505a\u5230\u4e86\u4e00\u5b9a\u7684\u201d\u524d\u77bb\u201c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728Seq2Seq\u6a21\u578b\u7684\u8bad\u7ec3\u4e0e\u9a8c\u8bc1\u8fc7\u7a0b\u4e2d\uff0c\u7ecf\u5e38\u4f1a\u51fa\u73b0\u8f93\u51fa\u53e5\u548c\u8f93\u5165\u53e5\u5b50\u6709\u4e00\u4e9bgap\u6216\u8005\u660e\u663e\u4e0d\u7b26\u5408\u5e38\u8bc6\u7684\u60c5 […]<\/p>\n","protected":false},"author":2,"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":[9],"tags":[],"views":5384,"_links":{"self":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/4265"}],"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\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/comments?post=4265"}],"version-history":[{"count":4,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/4265\/revisions"}],"predecessor-version":[{"id":4270,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/4265\/revisions\/4270"}],"wp:attachment":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/media?parent=4265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/categories?post=4265"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/tags?post=4265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}