{"id":107095,"date":"2026-09-19T00:08:53","date_gmt":"2026-09-18T16:08:53","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/107095.html"},"modified":"2026-09-19T00:08:53","modified_gmt":"2026-09-18T16:08:53","slug":"%e6%b7%b1%e5%ba%a6%e5%ad%a6%e4%b9%a0%e5%9f%ba%e7%a1%80%e7%9f%a5%e8%af%86","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/107095.html","title":{"rendered":"\u6df1\u5ea6\u5b66\u4e60\u57fa\u7840\u77e5\u8bc6"},"content":{"rendered":"<h2>\u6df1\u5ea6\u5b66\u4e60\u5165\u95e8\u7b14\u8bb0&#xff1a;\u5f20\u91cf\u4e0e PyTorch \u57fa\u7840<\/h2>\n<p>\u5b66\u4e60\u76ee\u6807&#xff1a;<\/p>\n<ul>\n<li>\u638c\u63e1\u6df1\u5ea6\u5b66\u4e60\u5165\u95e8\u57fa\u7840\u77e5\u8bc6<\/li>\n<li>\u719f\u7ec3\u6df1\u5ea6\u5b66\u4e60\u7684\u57fa\u672c\u6982\u5ff5\u548c\u8fd0\u7528\u673a\u5236<\/li>\n<\/ul>\n<hr \/>\n<h3>\u76ee\u5f55<\/h3>\n<ul>\n<li>\u4e00\u3001import torch \u8be6\u89e3<\/li>\n<li>\u4e8c\u3001\u5f20\u91cf\u7684\u6982\u5ff5<\/li>\n<li>\u4e09\u3001\u7ef4\u6570\u7684\u7b80\u5355\u7406\u89e3<\/li>\n<li>\u56db\u3001\u5f20\u91cf\u7684\u529f\u80fd\u5b9e\u73b0\n<ul>\n<li>4.1 shape \u548c numel()<\/li>\n<li>4.2 reshape()<\/li>\n<li>4.3 zeros()<\/li>\n<li>4.4 \u901a\u8fc7\u5217\u8868\u521b\u5efa\u4e8c\u7ef4\u6570\u7ec4<\/li>\n<li>4.5 \u8fd0\u7b97\u7b26<\/li>\n<li>4.6 cat()<\/li>\n<li>4.7 sum()<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u5e7f\u64ad\u673a\u5236<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e00\u3001import torch \u8be6\u89e3<\/h3>\n<h4>1.1 \u5177\u4f53\u542b\u4e49<\/h4>\n<ul>\n<li>torch \u662f PyTorch \u5e93\u7684\u9876\u5c42\u5305\u540d<\/li>\n<li>import torch \u628a PyTorch \u7684\u6838\u5fc3\u529f\u80fd\u52a0\u8f7d\u5230\u5f53\u524d Python \u73af\u5883\u4e2d<\/li>\n<li>\u4e4b\u540e\u5c31\u53ef\u4ee5\u7528 torch.xxx \u6765\u8c03\u7528\u5b83\u7684\u5404\u79cd API<\/li>\n<\/ul>\n<h4>1.2 PyTorch \u662f\u4ec0\u4e48<\/h4>\n<p>PyTorch \u662f\u76ee\u524d\u6700\u6d41\u884c\u7684\u6df1\u5ea6\u5b66\u4e60\u6846\u67b6\u4e4b\u4e00&#xff0c;\u7531 Meta&#xff08;Facebook&#xff09; \u5f00\u6e90\u3002<\/p>\n<p>\u5e7f\u6cdb\u7528\u4e8e&#xff1a;<\/p>\n<ul>\n<li>&#x1f9e0; \u795e\u7ecf\u7f51\u7edc\u642d\u5efa\u4e0e\u8bad\u7ec3<\/li>\n<li>&#x1f4ca; \u5f20\u91cf&#xff08;Tensor&#xff09;\u8ba1\u7b97&#xff08;\u7c7b\u4f3c NumPy&#xff0c;\u4f46\u652f\u6301 GPU \u52a0\u901f&#xff09;<\/li>\n<li>&#x1f501; \u81ea\u52a8\u6c42\u5bfc&#xff08;autograd&#xff09;<\/li>\n<li>&#x1f441;\ufe0f \u8ba1\u7b97\u673a\u89c6\u89c9\u3001&#x1f4dd; \u81ea\u7136\u8bed\u8a00\u5904\u7406 \u7b49 AI \u4efb\u52a1<\/li>\n<\/ul>\n<h4>1.3 \u5bfc\u5165 torch \u5305<\/h4>\n<p><span class=\"token keyword\">import<\/span> torch<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u5f20\u91cf\u7684\u6982\u5ff5<\/h3>\n<p>\u5f20\u91cf&#xff08;Tensor&#xff09;\u662f PyTorch \u4e2d\u7684\u6838\u5fc3\u6570\u636e\u7ed3\u6784&#xff0c;\u7528\u4e8e\u5b58\u50a8\u548c\u64cd\u4f5c\u591a\u7ef4\u6570\u7ec4\u3002\u5f20\u91cf\u53ef\u4ee5\u89c6\u4e3a\u4e00\u4e2a\u591a\u7ef4\u6570\u7ec4&#xff0c;\u652f\u6301\u52a0\u901f\u8ba1\u7b97\u7684\u64cd\u4f5c\u3002<\/p>\n<p>\u5728 PyTorch \u4e2d&#xff0c;\u5f20\u91cf\u7684\u6982\u5ff5\u7c7b\u4f3c\u4e8e NumPy \u4e2d\u7684\u6570\u7ec4&#xff0c;\u4f46\u662f PyTorch \u7684\u5f20\u91cf\u53ef\u4ee5\u8fd0\u884c\u5728\u4e0d\u540c\u7684\u8bbe\u5907\u4e0a&#xff0c;\u6bd4\u5982 CPU \u548c GPU&#xff0c;\u8fd9\u4f7f\u5f97\u5b83\u4eec\u975e\u5e38\u9002\u5408\u4e8e\u8fdb\u884c\u5927\u89c4\u6a21\u5e76\u884c\u8ba1\u7b97&#xff0c;\u7279\u522b\u662f\u5728\u6df1\u5ea6\u5b66\u4e60\u9886\u57df\u3002<\/p>\n<hr \/>\n<h3>\u4e09\u3001\u7ef4\u6570\u7684\u7b80\u5355\u7406\u89e3<\/h3>\n<ul>\n<li>\u4e00\u7ef4\u662f\u4e00\u884c\u5143\u7d20&#xff1a;[1, 2, 3, 4]<\/li>\n<li>\u4e8c\u7ef4\u662f\u884c\u548c\u5217&#xff1a;(3, 4) \u8868\u793a\u4e09\u884c\u56db\u5217&#xff0c;\u5373 (\u884c\u6570, \u5217\u6570)<\/li>\n<li>\u4e09\u7ef4\u662f n \u4e2a\u4e8c\u7ef4\u7684\u7ec4\u6210&#xff0c;\u76f8\u5f53\u4e8e n \u4e2a\u4e8c\u7ef4\u8868\u683c&#xff1a;(2, 3, 4) \u8868\u793a\u6709\u4e24\u4e2a\u8868\u683c&#xff0c;\u6bcf\u4e2a\u8868\u683c\u4e09\u884c\u56db\u5217&#xff0c;\u5373 (\u4e2a\u6570, \u884c\u6570, \u5217\u6570)<\/li>\n<\/ul>\n<p>\u4e8c\u7ef4\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token punctuation\">[<\/span><br \/>\n    <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/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 number\">1<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token punctuation\">]<\/span><\/p>\n<p>\u4e09\u7ef4\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token punctuation\">[<\/span><br \/>\n    <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\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n     <span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n     <span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/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 punctuation\">,<\/span><\/p>\n<p>    <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n     <span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n     <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> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n     <span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/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\">]<\/span><\/p>\n<hr \/>\n<h3>\u56db\u3001\u5f20\u91cf\u7684\u529f\u80fd\u5b9e\u73b0<\/h3>\n<p>\u4e3a\u4e86\u521d\u5b66\u8005\u53ef\u4ee5\u66f4\u597d\u5730\u5438\u6536\u77e5\u8bc6&#xff0c;\u4ee5\u4e0b\u4ee3\u7801\u7684\u521d\u59cb\u5f20\u91cf\/\u6570\u7ec4\u9700\u8981\u81ea\u5df1\u5efa\u7acb\u3002<\/p>\n<p>\u4e00\u4e2a\u6570\u503c\u7ec4\u6210\u7684\u6570\u7ec4&#xff0c;\u6709\u591a\u4e2a\u7ef4\u5ea6&#xff1a;<\/p>\n<p>x <span class=\"token operator\">&#061;<\/span> torch<span class=\"token punctuation\">.<\/span>arange<span class=\"token punctuation\">(<\/span><span class=\"token number\">12<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">8<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">11<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h4>4.1 shape \u548c numel()<\/h4>\n<p>\u901a\u8fc7\u5f20\u91cf\u7684 shape \u5c5e\u6027\u8bbf\u95ee\u5f62\u72b6&#xff0c;numel() \u67e5\u770b\u5143\u7d20\u603b\u4e2a\u6570\u3002<\/p>\n<p><span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">.<\/span>shape<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">.<\/span>numel<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>   <span class=\"token comment\"># number element<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>torch<span class=\"token punctuation\">.<\/span>Size<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">12<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token number\">12<\/span><\/p>\n<p>&#x1f4a1; shape \u8fd4\u56de torch.Size \u7c7b\u578b&#xff0c;\u53ef\u4ee5\u7528 x.shape[0] \u53d6\u7b2c 0 \u7ef4\u7684\u5927\u5c0f\u3002<\/p>\n<h4>4.2 reshape()<\/h4>\n<p>\u6539\u53d8\u5f62\u72b6\u4f46\u4e0d\u6539\u53d8\u5143\u7d20\u6570\u91cf\u548c\u503c&#xff0c;\u53ef\u4ee5\u8c03\u7528 reshape()\u3002<\/p>\n<p>rs <span class=\"token operator\">&#061;<\/span> x<span class=\"token punctuation\">.<\/span>reshape<span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>rs<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">7<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">11<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>&#x1f4a1; reshape(-1, n) \u4e2d\u7684 -1 \u8868\u793a\u8be5\u7ef4\u5ea6\u81ea\u52a8\u63a8\u65ad\u3002<\/p>\n<h4>4.3 zeros()<\/h4>\n<p>\u521b\u5efa\u5168 0\u3001\u5168 1 \u7684\u4efb\u610f\u7ef4\u6570\u7ec4\u3002<\/p>\n<p><span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u9ed8\u8ba4\u51680&#xff1a;&#034;<\/span><span class=\"token punctuation\">,<\/span> torch<span class=\"token punctuation\">.<\/span>zeros<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/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 punctuation\">)<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>\u9ed8\u8ba4\u5168<span class=\"token number\">0<\/span>&#xff1a; tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n         <span class=\"token punctuation\">[<\/span><span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n         <span class=\"token punctuation\">[<\/span><span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><\/p>\n<p>        <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n         <span class=\"token punctuation\">[<\/span><span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n         <span class=\"token punctuation\">[<\/span><span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>&#x1f4a1; \u5bf9\u5e94\u7684\u8fd8\u6709 torch.ones((2, 3, 4))&#xff0c;\u521b\u5efa\u5168 1 \u5f20\u91cf\u3002<\/p>\n<h4>4.4 \u901a\u8fc7\u5217\u8868\u521b\u5efa\u4e8c\u7ef4\u6570\u7ec4<\/h4>\n<p>\u5217\u8868\u5d4c\u5957\u5217\u8868\u3002<\/p>\n<p><span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>torch<span class=\"token punctuation\">.<\/span>tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/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 number\">3<\/span><span class=\"token punctuation\">]<\/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\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/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 punctuation\">[<\/span><span class=\"token number\">4<\/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 number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/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 number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/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 number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h4>4.5 \u8fd0\u7b97\u7b26<\/h4>\n<p>\u90fd\u662f\u6309\u5bf9\u5e94\u5143\u7d20\u8fd0\u7b97\u3002<\/p>\n<p>n1 <span class=\"token operator\">&#061;<\/span> torch<span class=\"token punctuation\">.<\/span>tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1.0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\nn2 <span class=\"token operator\">&#061;<\/span> torch<span class=\"token punctuation\">.<\/span>tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>n1 <span class=\"token operator\">&#043;<\/span> n2<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>n1 <span class=\"token operator\">&#8211;<\/span> n2<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>n1 <span class=\"token operator\">*<\/span> n2<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>n1 <span class=\"token operator\">\/<\/span> n2<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>n1 <span class=\"token operator\">**<\/span> n2<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token number\">3.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">4.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">6.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\ntensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">2.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">6.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\ntensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token number\">2.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">4.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">8.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">16.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\ntensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0.5000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1.0000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2.0000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4.0000<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\ntensor<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 number\">16.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">64.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h4>4.6 cat()<\/h4>\n<p>\u5f20\u91cf\u7684\u62fc\u63a5&#xff1a;torch.cat() \u662f PyTorch \u91cc\u7528\u6765\u62fc\u63a5\u5f20\u91cf\u7684\u51fd\u6570&#xff0c;\u5168\u79f0\u662f concatenate\u3002<\/p>\n<p>\u5b83\u628a\u591a\u4e2a\u5f20\u91cf\u6cbf\u7740\u6307\u5b9a\u7684\u7ef4\u5ea6&#034;\u63a5&#034;\u5728\u4e00\u8d77&#xff0c;\u4e0d\u6539\u53d8\u5f20\u91cf\u7684\u5176\u4ed6\u7ef4\u5ea6\u3002<\/p>\n<ul>\n<li>\n<p>dim &#061; 0&#xff1a;<\/p>\n<li>\u4e00\u7ef4\u6570\u7ec4&#xff1a;\u589e\u52a0\u957f\u5ea6<\/li>\n<li>\u4e8c\u7ef4\u6570\u7ec4&#xff1a;\u589e\u52a0\u884c\u6570&#xff0c;\u5217\u6570\u4e0d\u53d8&#xff0c;\u53d8\u6210\u7ad6\u6761\u6761&#xff0c;\u5782\u76f4\u62fc\u63a5<\/li>\n<\/li>\n<li>\n<p>dim &#061; 1&#xff1a;<\/p>\n<li>\u4e00\u7ef4\u6ca1\u6709 dim &#061; 1<\/li>\n<li>\u4e8c\u7ef4\u6570\u7ec4&#xff1a;\u6c34\u5e73\u62fc\u63a5&#xff0c;\u589e\u52a0\u5217\u6570<\/li>\n<\/li>\n<\/ul>\n<p>arr1 <span class=\"token operator\">&#061;<\/span> torch<span class=\"token punctuation\">.<\/span>arange<span class=\"token punctuation\">(<\/span><span class=\"token number\">12<\/span><span class=\"token punctuation\">,<\/span> dtype<span class=\"token operator\">&#061;<\/span>torch<span class=\"token punctuation\">.<\/span>float32<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>reshape<span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><br \/>\narr2 <span class=\"token operator\">&#061;<\/span> torch<span class=\"token punctuation\">.<\/span>tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><br \/>\n    <span class=\"token punctuation\">[<\/span><span class=\"token number\">2.0<\/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 number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/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 number\">1<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7b2c0\u7ef4\u62fc\u63a5&#xff1a;&#034;<\/span><span class=\"token punctuation\">,<\/span> torch<span class=\"token punctuation\">.<\/span>cat<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>arr1<span class=\"token punctuation\">,<\/span> arr2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> dim<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7b2c1\u7ef4\u62fc\u63a5&#xff1a;&#034;<\/span><span class=\"token punctuation\">,<\/span> torch<span class=\"token punctuation\">.<\/span>cat<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>arr1<span class=\"token punctuation\">,<\/span> arr2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> dim<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>\u7b2c<span class=\"token number\">0<\/span>\u7ef4\u62fc\u63a5&#xff1a; tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">1.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">2.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">3.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span> <span class=\"token number\">4.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">5.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">6.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">7.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span> <span class=\"token number\">8.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">9.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">11.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span> <span class=\"token number\">2.<\/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 number\">3.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span> <span class=\"token number\">1.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">2.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">3.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">4.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span> <span class=\"token number\">4.<\/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 number\">1.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u7b2c<span class=\"token number\">1<\/span>\u7ef4\u62fc\u63a5&#xff1a; tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span> <span class=\"token number\">0.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">1.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">2.<\/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 number\">1.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">4.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">3.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span> <span class=\"token number\">4.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">5.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">6.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">7.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">1.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">2.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">3.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">4.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span> <span class=\"token number\">8.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">9.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">11.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">4.<\/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 number\">1.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h4>4.7 sum()<\/h4>\n<p>\u5f20\u91cf\u6c42\u548c&#xff0c;\u6240\u6709\u5143\u7d20\u76f8\u52a0\u3002<\/p>\n<p><span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>arr1<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>tensor<span class=\"token punctuation\">(<\/span><span class=\"token number\">66.<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>&#x1f4a1; \u4e5f\u53ef\u4ee5\u6309\u7ef4\u5ea6\u6c42\u548c&#xff1a;arr1.sum(dim&#061;0) \u6309\u5217\u6c42\u548c&#xff0c;arr1.sum(dim&#061;1) \u6309\u884c\u6c42\u548c\u3002<\/p>\n<hr \/>\n<h3>\u4e94\u3001\u5e7f\u64ad\u673a\u5236<\/h3>\n<p>\u4e24\u4e2a\u4e0d\u540c\u7ef4\u6570\u7684\u5f20\u91cf&#xff0c;\u53ef\u4ee5\u901a\u8fc7\u6269\u5f20\u6216\u8005\u590d\u5236\u53d8\u6210\u4e00\u6837\u7ef4\u6570\u7684\u5f20\u91cf\u3002<\/p>\n<h4>5.1 \u7ef4\u6570\u4e0d\u540c\u65f6<\/h4>\n<li>\u5148\u53f3\u5bf9\u9f50&#xff0c;\u7f3a\u7ef4\u8865 1&#xff08;\u8865\u5de6\u8fb9&#xff09;<\/li>\n<li>\u4ece\u53f3\u5f80\u5de6\u4e00\u4f4d\u4e00\u4f4d\u6bd4&#xff1a;\u76f8\u540c\u53ef\u4ee5\u7ee7\u7eed&#xff1b;\u4e0d\u76f8\u540c\u65f6&#xff0c;\u5982\u679c\u81f3\u5c11\u6709\u4e00\u4e2a 1 \u5219\u7ee7\u7eed&#xff1b;\u90fd\u4e0d\u662f 1 \u4e0d\u80fd\u8c03\u7528\u5e7f\u64ad\u673a\u5236\u8fdb\u884c\u8fd0\u7b97<\/li>\n<li>\u6bcf\u4e00\u4f4d\u90fd\u8981\u8fc7&#xff0c;\u4e00\u7968\u5426\u51b3&#xff1b;\u7ed3\u679c\u5f62\u72b6\u6bcf\u7ef4\u53d6\u5927\u503c<\/li>\n<h4>5.2 \u7ef4\u6570\u76f8\u540c\u65f6<\/h4>\n<p>\u76f4\u63a5\u6309\u4f4d\u6bd4\u8f83&#xff0c;\u76f8\u540c\u6216\u8005\u81f3\u5c11\u6709 1 \u4e2a 1 \u5c31\u53ef\u4ee5&#xff0c;\u53cd\u4e4b\u4e0d\u53ef\u4ee5\u3002<\/p>\n<h4>5.3 \u793a\u4f8b<\/h4>\n<p>arr3 <span class=\"token operator\">&#061;<\/span> torch<span class=\"token punctuation\">.<\/span>arange<span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>reshape<span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\narr4 <span class=\"token operator\">&#061;<\/span> torch<span class=\"token punctuation\">.<\/span>arange<span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>reshape<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>arr3<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>arr4<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>arr3 <span class=\"token operator\">&#043;<\/span> arr4<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/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 punctuation\">)<\/span><\/p>\n<p>tensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/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\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>&#x1f4a1; \u7ed3\u679c\u5f62\u72b6\u4e3a (3, 2)&#xff1a;arr3 \u6cbf\u5217\u65b9\u5411\u590d\u5236 2 \u6b21&#xff0c;arr4 \u6cbf\u884c\u65b9\u5411\u590d\u5236 3 \u6b21\u3002<\/p>\n<hr \/>\n<p>&#x1f4cc; \u603b\u7ed3&#xff1a;\u672c\u6587\u4ece import torch \u51fa\u53d1&#xff0c;\u4ecb\u7ecd\u4e86\u5f20\u91cf\u7684\u6982\u5ff5\u3001\u7ef4\u5ea6\u7406\u89e3\u3001\u5e38\u7528\u64cd\u4f5c&#xff08;shape\u3001reshape\u3001zeros\u3001cat\u3001sum \u7b49&#xff09;\u4ee5\u53ca\u5e7f\u64ad\u673a\u5236&#xff0c;\u9002\u5408\u6df1\u5ea6\u5b66\u4e60\u5165\u95e8\u8005\u5efa\u7acb\u57fa\u7840\u77e5\u8bc6\u6846\u67b6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5ea6\u5b66\u4e60\u5165\u95e8\u7b14\u8bb0&#xff1a;\u5f20\u91cf\u4e0e PyTorch \u57fa\u7840 \u5b66\u4e60\u76ee\u6807&#xff1a; \u638c\u63e1\u6df1\u5ea6\u5b66\u4e60\u5165\u95e8\u57fa\u7840\u77e5\u8bc6\u719f\u7ec3\u6df1\u5ea6\u5b66\u4e60\u7684\u57fa\u672c\u6982\u5ff5\u548c\u8fd0\u7528\u673a\u5236 \u76ee\u5f55<br \/>\n\u4e00\u3001import torch \u8be6\u89e3\u4e8c\u3001\u5f20\u91cf\u7684\u6982\u5ff5\u4e09\u3001\u7ef4\u6570\u7684\u7b80\u5355\u7406\u89e3\u56db\u3001\u5f20\u91cf\u7684\u529f\u80fd\u5b9e\u73b0 4.1 shape \u548c numel()4.2 reshape()4.3 zeros()4.4 \u901a\u8fc7\u5217\u8868\u521b\u5efa\u4e8c\u7ef4\u6570\u7ec44.5 \u8fd0\u7b97\u7b264.6 cat()4.7 sum() \u4e94\u3001\u5e7f\u64ad\u673a\u5236 \u4e00\u3001import torch \u8be6\u89e3<br \/>\n1.1 \u5177\u4f53\u542b\u4e49<br \/>\nt<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[9098,88,81,207,86],"topic":[],"class_list":["post-107095","post","type-post","status-publish","format-standard","hentry","category-server","tag-it","tag-conda","tag-python","tag-207","tag-86"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u6df1\u5ea6\u5b66\u4e60\u57fa\u7840\u77e5\u8bc6 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/107095.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u6df1\u5ea6\u5b66\u4e60\u57fa\u7840\u77e5\u8bc6 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6df1\u5ea6\u5b66\u4e60\u5165\u95e8\u7b14\u8bb0&#xff1a;\u5f20\u91cf\u4e0e PyTorch \u57fa\u7840 \u5b66\u4e60\u76ee\u6807&#xff1a; \u638c\u63e1\u6df1\u5ea6\u5b66\u4e60\u5165\u95e8\u57fa\u7840\u77e5\u8bc6\u719f\u7ec3\u6df1\u5ea6\u5b66\u4e60\u7684\u57fa\u672c\u6982\u5ff5\u548c\u8fd0\u7528\u673a\u5236 \u76ee\u5f55 \u4e00\u3001import torch \u8be6\u89e3\u4e8c\u3001\u5f20\u91cf\u7684\u6982\u5ff5\u4e09\u3001\u7ef4\u6570\u7684\u7b80\u5355\u7406\u89e3\u56db\u3001\u5f20\u91cf\u7684\u529f\u80fd\u5b9e\u73b0 4.1 shape \u548c numel()4.2 reshape()4.3 zeros()4.4 \u901a\u8fc7\u5217\u8868\u521b\u5efa\u4e8c\u7ef4\u6570\u7ec44.5 \u8fd0\u7b97\u7b264.6 cat()4.7 sum() \u4e94\u3001\u5e7f\u64ad\u673a\u5236 \u4e00\u3001import torch \u8be6\u89e3 1.1 \u5177\u4f53\u542b\u4e49 t\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/107095.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-18T16:08:53+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/107095.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/107095.html\",\"name\":\"\u6df1\u5ea6\u5b66\u4e60\u57fa\u7840\u77e5\u8bc6 - 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\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/107095.html","og_locale":"zh_CN","og_type":"article","og_title":"\u6df1\u5ea6\u5b66\u4e60\u57fa\u7840\u77e5\u8bc6 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u6df1\u5ea6\u5b66\u4e60\u5165\u95e8\u7b14\u8bb0&#xff1a;\u5f20\u91cf\u4e0e PyTorch \u57fa\u7840 \u5b66\u4e60\u76ee\u6807&#xff1a; \u638c\u63e1\u6df1\u5ea6\u5b66\u4e60\u5165\u95e8\u57fa\u7840\u77e5\u8bc6\u719f\u7ec3\u6df1\u5ea6\u5b66\u4e60\u7684\u57fa\u672c\u6982\u5ff5\u548c\u8fd0\u7528\u673a\u5236 \u76ee\u5f55 \u4e00\u3001import torch \u8be6\u89e3\u4e8c\u3001\u5f20\u91cf\u7684\u6982\u5ff5\u4e09\u3001\u7ef4\u6570\u7684\u7b80\u5355\u7406\u89e3\u56db\u3001\u5f20\u91cf\u7684\u529f\u80fd\u5b9e\u73b0 4.1 shape \u548c numel()4.2 reshape()4.3 zeros()4.4 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