{"id":31266,"date":"2025-04-21T09:04:35","date_gmt":"2025-04-21T01:04:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/31266.html"},"modified":"2025-04-21T09:04:35","modified_gmt":"2025-04-21T01:04:35","slug":"yolov8%e6%9e%b6%e6%9e%84%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/31266.html","title":{"rendered":"YOLOv8\u67b6\u6784\u8be6\u89e3"},"content":{"rendered":"<\/p>\n<h4>&#x1f4cc;YOLOv8\u67b6\u6784\u8be6\u89e3<\/h4>\n<ul>\n<li>YOLOv8 \u67b6\u6784\u56fe<\/li>\n<li>YOLOv8 Backbone\u90e8\u5206<\/li>\n<li>YOLOv8 Head\u90e8\u5206<\/li>\n<li>\n<ul>\n<li>Neck\u548cHead\u7ed3\u6784<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u5728\u89c6\u89c9\u6df1\u5ea6\u5b66\u4e60\u4e2d&#xff0c;\u901a\u5e38\u5c06\u6a21\u578b\u5206\u4e3a 2~3 \u4e2a\u7ec4\u6210\u90e8\u5206&#xff1a;backbone\u3001neck&#xff08;\u53ef\u9009&#xff09; \u548c head\u3002<\/p>\n<ul>\n<li>Backbone&#xff08;\u4e3b\u5e72\u7f51\u7edc&#xff09;\u8d1f\u8d23\u4ece\u8f93\u5165\u56fe\u50cf\u4e2d\u63d0\u53d6\u7279\u5f81&#xff0c;\u5c06\u56fe\u50cf\u8f6c\u5316\u4e3a\u5177\u6709\u4e30\u5bcc\u8bed\u4e49\u4fe1\u606f\u7684\u7279\u5f81\u8868\u793a\u3002<\/li>\n<li>Neck&#xff08;\u9888\u90e8&#xff0c;\u8fde\u63a5\u90e8&#xff09;\u662f\u4e00\u4e2a\u4e2d\u95f4\u5c42&#xff0c;\u7528\u4e8e\u5bf9\u6765\u81ea backbone \u7684\u7279\u5f81\u8fdb\u884c\u878d\u5408&#xff0c;\u4ee5\u63d0\u5347\u6a21\u578b\u7684\u6027\u80fd\u3002<\/li>\n<li>Head&#xff08;\u4efb\u52a1\u5934&#xff09;\u662f\u6a21\u578b\u7684\u6700\u540e\u4e00\u5c42&#xff0c;\u5176\u7ed3\u6784\u4f1a\u6839\u636e\u4e0d\u540c\u7684\u4efb\u52a1\u800c\u6709\u6240\u4e0d\u540c\u3002\u4f8b\u5982&#xff0c;\u5728\u56fe\u50cf\u5206\u7c7b\u4efb\u52a1\u4e2d&#xff0c;\u6211\u4eec\u901a\u5e38\u4f1a\u4f7f\u7528 softmax \u5206\u7c7b\u5668\u4f5c\u4e3a Head&#xff0c;\u800c\u5728\u76ee\u6807\u68c0\u6d4b\u4efb\u52a1\u4e2d&#xff0c;\u6211\u4eec\u5219\u53ef\u80fd\u4f1a\u4f7f\u7528\u8fb9\u754c\u6846\u56de\u5f52\u5668\u548c\u5206\u7c7b\u5668\u4f5c\u4e3a Head\u3002<\/li>\n<\/ul>\n<h2>YOLOv8 \u67b6\u6784\u56fe<\/h2>\n<p>\u5173\u4e8e\u4e0b\u9762\u7ecf\u5178\u7684\u67b6\u6784\u56fe\u7684\u7b80\u8981\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u56fe\u7684\u4e0a\u9762\u90e8\u5206\u4e3a YOLOv8 \u67b6\u6784\u7684\u6982\u8981\u56fe&#xff08;\u5305\u62ec Backbone&#xff0c;Head&#xff09;\u3002YOLOv8 \u6ca1\u6709\u4f7f\u7528Neck \u8fd9\u4e2a\u6982\u5ff5&#xff0c;\u4f46\u5176\u67b6\u6784\u56fe\u4e2d Head \u4e2d\u7c7b\u4f3c PANet \u529f\u80fd\u7684\u90e8\u5206\u4e5f\u53ef\u4ee5\u5f52\u4e3a Neck\u3002<\/li>\n<li>\u56fe\u53f3\u4e2d\u4f4d\u7f6e Detail \u4e3a\u5404\u4e2a\u7ec4\u4ef6\u7684\u8be6\u7ec6\u67b6\u6784\u793a\u4f8b&#xff0c;\u53e6\u8bf4\u660e\u4e86\u4e0d\u540c\u6a21\u578b\u5927\u5c0f\u7684\u53c2\u6570\u9009\u62e9\u3002<\/li>\n<li>\u56fe\u5de6 &#043; \u56fe\u4e0b\u90e8\u5206&#xff0c;\u4ee5\u5206\u6b65\u7684\u65b9\u5f0f\u5217\u51fa\u4e86\u5b8c\u6574\u7684\u6570\u636e\u6d41\u3002<\/li>\n<li>\u6bcf\u4e2a\u6846\u7684\u53f3\u4e0a\u89d2\u7684\u6570\u5b57\u4e3a\u5c42\u7684\u7f16\u53f7&#xff0c;\u53ef\u4ee5\u548c\u540e\u9762\u7684\u793a\u4f8b\u8f93\u51fa 1 \u5bf9\u7167\u770b\u3002<\/li>\n<\/ul>\n<p>\u53ef\u4ee5\u770b\u51fa&#xff0c;YOLOv8 Backbone \u4e3a 0~9 \u5c42&#xff0c;10~21 \u5c42\u4e3a YOLOv8 Head\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250421010426-6805999a75ef6.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250421010431-6805999fba241.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>YOLOv8 Backbone\u90e8\u5206<\/h2>\n<p>\u89c1\u56fe\u4e2d\u7b2c 0~9 \u5c42\u3002\u5206\u522b\u4e3a<\/p>\n<ul>\n<li>Conv &#043; Conv &#043; C2f<\/li>\n<li>Conv &#043; C2f&#xff08;\u5bf9\u9f50\u7279\u5f81\u91d1\u5b57\u5854 P3&#xff09;<\/li>\n<li>Conv &#043; C2f&#xff08;\u5bf9\u9f50\u7279\u5f81\u91d1\u5b57\u5854 P4&#xff09;<\/li>\n<li>Conv &#043; C2f &#043; SPPF&#xff08;\u5bf9\u9f50\u7279\u5f81\u91d1\u5b57\u5854 P5&#xff09;<\/li>\n<\/ul>\n<h2>YOLOv8 Head\u90e8\u5206<\/h2>\n<h3>Neck\u548cHead\u7ed3\u6784<\/h3>\n<p>\u7b2c\u4e00\u79cd\u89e3\u91ca&#xff1a;<\/p>\n<p>\u5728YOLOv8 \u7684yaml\u6587\u4ef6\u4e2d\u5e76\u6ca1\u6709\u663e\u793a\u5730\u5212\u5206\u51faNeck\u90e8\u5206&#xff0c;\u5b9e\u9645\u4e0aNeck\u7f51\u7edc\u7ed3\u6784\u5c31\u662f\u5176Head \u7f51\u7edc\u7ed3\u6784\u4e2d\u90e8\u5206\u7684\u524d\u534a\u90e8\u5206\u3002<\/p>\n<p>head\u90e8\u5206\u6574\u4f53\u56fe&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250421010433-680599a144d20.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><span class=\"token key atrule\">head<\/span><span class=\"token punctuation\">:<\/span><\/p>\n<p>  <span class=\"token comment\">###neck###<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> nn.Upsample<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span>None<span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;nearest&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Concat<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># cat backbone P4<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> C2f<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">512<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># 12<\/span><\/p>\n<p>  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> nn.Upsample<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span>None<span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;nearest&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Concat<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># cat backbone P3<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> C2f<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">256<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># 15 (P3\/8-small)<\/span><br \/>\n  <span class=\"token comment\">###########<\/span><\/p>\n<p>  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Conv<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">256<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">12<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Concat<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># cat head P4<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> C2f<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">512<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># 18 (P4\/16-medium)<\/span><\/p>\n<p>  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Conv<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">512<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Concat<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># cat head P5<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> C2f<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># 21 (P5\/32-large)<\/span><\/p>\n<p>  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">21<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Detect<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span>nc<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># Detect(P3, P4, P5)<\/span><\/p>\n<p>yaml\u914d\u7f6e\u6587\u4ef6\u4e2d&#xff0c;\u6ce8\u91ca\u6bb5\u843d\u5373\u4e3aNeck\u7ed3\u6784<\/p>\n<hr \/>\n<p>\u7b2c\u4e8c\u79cd\u89e3\u91ca&#xff1a;<\/p>\n<p><span class=\"token key atrule\">head<\/span><span class=\"token punctuation\">:<\/span><\/p>\n<p>  <span class=\"token comment\">###neck###<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> nn.Upsample<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span>None<span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;nearest&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Concat<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># cat backbone P4<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> C2f<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">512<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># 12<\/span><\/p>\n<p>  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> nn.Upsample<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span>None<span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;nearest&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Concat<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># cat backbone P3<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> C2f<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">256<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># 15 (P3\/8-small)<\/span><\/p>\n<p>  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Conv<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">256<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">12<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Concat<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># cat head P4<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> C2f<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">512<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># 18 (P4\/16-medium)<\/span><\/p>\n<p>  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Conv<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">512<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><br \/>\n  <span class=\"token punctuation\">&#8211;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">-1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> Concat<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># cat head P5<\/span><br \/>\n 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