{"id":332,"date":"2022-07-09T16:58:14","date_gmt":"2022-07-09T08:58:14","guid":{"rendered":"https:\/\/www.lazybirds.top\/?p=332"},"modified":"2022-07-09T16:59:27","modified_gmt":"2022-07-09T08:59:27","slug":"d2l%e8%87%aa%e5%ad%a6%e7%ac%94%e8%ae%b0-2-%e9%a2%84%e5%a4%87%e7%9f%a5%e8%af%86","status":"publish","type":"post","link":"https:\/\/www.lazybirds.top\/?p=332","title":{"rendered":"d2l\u81ea\u5b66\u7b14\u8bb0 &#8211; 2.\u9884\u5907\u77e5\u8bc6"},"content":{"rendered":"\n<p>(\u3002\uff3f \u3002\uff09 \u270e\uff3f\u5047\u671fFLAG\uff1a\u5165\u95e8\u6df1\u5ea6\u5b66\u4e60\uff01<\/p>\n\n\n\n<p>\u81ea\u5b66\u6559\u6750\u4e3a\u300a\u52a8\u624b\u5b66\u6df1\u5ea6\u5b66\u4e60\u300b\u4e00\u4e66\uff1a<\/p>\n\n\n\n<p><a href=\"https:\/\/zh.d2l.ai\/\">\u300a\u52a8\u624b\u5b66\u6df1\u5ea6\u5b66\u4e60\u300b \u2014 \u52a8\u624b\u5b66\u6df1\u5ea6\u5b66\u4e60 2.0.0-beta0 documentation (d2l.ai)<\/a><\/p>\n\n\n\n<p>\u5176\u5b9e\u60f3\u5b66\u6df1\u5ea6\u5b66\u4e60\u597d\u4e45\u4e86\uff0c\u4f46\u90fd\u82e6\u4e8e\u6ca1\u6709\u5927\u5757\u65f6\u95f4\u53bb\u5b66\u4e60\u3002\u521a\u521a\u8fc7\u53bb\u7684\u4e00\u5b66\u671f\u91cc\u5728\u4e0d\u540c\u6559\u7a0b\u91cc\u53cd\u590d\u6a2a\u8df3\uff0c\u5374\u90fd\u6ca1\u633a\u8fc7\u7b2c\u4e8c\u7ae0&#8230; \u5927\u6982\u5149\u770b\u770b\u4e66\u4e0d\u592a\u884c\uff0c\u5bb9\u6613\u5fd8\u3002\u770b\u6765\u8fd8\u662f\u5f97\u505a\u505a\u7b14\u8bb0\u7684\u3002\u6709\u8f93\u5165\uff0c\u6709\u8f93\u51fa\uff0c\u8c28\u9075\u8d39\u66fc\u5148\u751f\u7684\u6559\u8bf2\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u662f\u7b2c\u4e8c\u7ae0\u7684\u7b14\u8bb0\uff0c\u4f46\u613f\u8fd9\u4e2a\u7cfb\u5217\u4e0d\u8981\u5728\u8fd9\u7ae0\u5b8c\u7ed3\u5427\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<meta charset=\"utf-8\">\n      <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n      \n      <link rel=\"stylesheet\" 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.markdown-preview{width:100%}}html body[for=\"html-export\"]:not([data-presentation-mode]):not([html-show-sidebar-toc]) .markdown-preview{left:50%;transform:translateX(-50%)}html body[for=\"html-export\"]:not([data-presentation-mode]):not([html-show-sidebar-toc]) .md-sidebar-toc{display:none}\n\/* Please visit the URL below for more information: *\/\n\/*   https:\/\/shd101wyy.github.io\/markdown-preview-enhanced\/#\/customize-css *\/\n\n      <\/style>\n\n\n      <div class=\"mume markdown-preview  \">\n\n<h2 class=\"mume-header\" id=\"numpy%E4%B8%8Epytorch%E5%86%85%E5%AD%98%E5%AD%98%E5%82%A8%E6%96%B9%E5%BC%8F\">numpy\u4e0epytorch\u5185\u5b58\u5b58\u50a8\u65b9\u5f0f<\/h2>\n\n<pre data-role=\"codeBlock\" data-info=\"py\" class=\"language-python\">X <span class=\"token operator\">=<\/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>\n<span class=\"token keyword keyword-print\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">id<\/span><span class=\"token punctuation\">(<\/span>X<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\nA <span class=\"token operator\">=<\/span> X<span class=\"token punctuation\">.<\/span>numpy<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n<span class=\"token keyword keyword-print\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">id<\/span><span class=\"token punctuation\">(<\/span>A<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\nX<span class=\"token punctuation\">.<\/span>add_<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> A\n<\/pre><p>\u8f93\u51fa<\/p>\n<pre data-role=\"codeBlock\" data-info=\"py\" class=\"language-python\"><span class=\"token number\">140487850431104<\/span> <span class=\"token number\">140487850554928<\/span>\n <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 punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">.<\/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 punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> array<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">.<\/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 number\">5<\/span><span class=\"token punctuation\">.<\/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 punctuation\">,<\/span> dtype<span class=\"token operator\">=<\/span>float32<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\n<\/pre><p>\u867d\u7136,X\u548cA\u7684\u5730\u5740\u4e0d\u4e00\u6837\uff0c\u4f46\u5171\u4eab\u5185\u5b58\u66f4\u65b0X\u4f1a\u6539\u53d8A\u3002\u800c\u8981\u628a\u4e00\u4e2anumpy\u8f6c\u4e3atensor<\/p>\n<pre data-role=\"codeBlock\" data-info=\"py\" class=\"language-python\">a <span class=\"token operator\">=<\/span> numpy<span class=\"token punctuation\">.<\/span>ones<span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span>\uff0c\n<\/pre><p>\u65b9\u6cd5\u4e00 b = torch.tensor(a) \u76f8\u5f53\u4e8e\u521b\u5efa\u4e00\u4e2a\u65b0tensor\uff0c\u4e0d\u4f1a\u5171\u4eab\u5185\u5b58<br>\n\u65b9\u6cd5\u4e8c b = torch.from_numpy(a) \u76f8\u5f53\u4e8e\u4ece\u83b7\u53d6numpy\u4e2d\u7684\u503c\uff0c\u4f1a\u5171\u4eab\u5185\u5b58<\/p>\n<p>\u6545.numpy\u548cfrom_numpy\u4f1a\u5171\u4eab\u5185\u5b58\uff0ctorch.tensor\u4e0d\u4f1a\u5171\u4eab\u5185\u5b58<\/p>\n<pre data-role=\"codeBlock\" data-info=\"py\" class=\"language-python\">A <span class=\"token operator\">=<\/span> torch<span class=\"token punctuation\">.<\/span>arange<span class=\"token punctuation\">(<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> dtype<span class=\"token operator\">=<\/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\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span>\nB <span class=\"token operator\">=<\/span> A<span class=\"token punctuation\">.<\/span>clone<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u901a\u8fc7\u5206\u914d\u65b0\u5185\u5b58\uff0c\u5c06A\u7684\u4e00\u4e2a\u526f\u672c\u5206\u914d\u7ed9B<\/span>\nA<span class=\"token punctuation\">,<\/span> A <span class=\"token operator\">+<\/span> B\n<\/pre><h2 class=\"mume-header\" id=\"%E9%9D%9E%E9%99%8D%E7%BB%B4%E6%B1%82%E5%92%8C\">\u975e\u964d\u7ef4\u6c42\u548c<\/h2>\n\n<p>\u6709\u65f6\u5728\u8c03\u7528\u51fd\u6570\u6765\u8ba1\u7b97\u603b\u548c\u6216\u5747\u503c\u65f6\u4fdd\u6301\u8f74\u6570\u4e0d\u53d8\u4f1a\u5f88\u6709\u7528\u3002<\/p>\n<pre data-role=\"codeBlock\" data-info=\"py\" class=\"language-python\">sum_A <span class=\"token operator\">=<\/span> A<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">sum<\/span><span class=\"token punctuation\">(<\/span>axis<span class=\"token operator\">=<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> keepdims<span class=\"token operator\">=<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span>\nsum_A\n\ntensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/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>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">22<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">38<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">54<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">70<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span>\n<\/pre><p>\u4f8b\u5982\uff0c\u7531\u4e8esum_A\u5728\u5bf9\u6bcf\u884c\u8fdb\u884c\u6c42\u548c\u540e\u4ecd\u4fdd\u6301\u4e24\u4e2a\u8f74\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5e7f\u64ad\u5c06A\u9664\u4ee5sum_A\u3002<\/p>\n<pre data-role=\"codeBlock\" data-info=\"py\" class=\"language-python\">A <span class=\"token operator\">\/<\/span> sum_A\n\ntensor<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0.0000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.1667<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.3333<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.5000<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">0.1818<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.2273<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.2727<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.3182<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">0.2105<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.2368<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.2632<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.2895<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">0.2222<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.2407<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.2593<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.2778<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">0.2286<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.2429<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.2571<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0.2714<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span>\n<\/pre><p>\u5982\u679c\u6211\u4eec\u60f3\u6cbf\u67d0\u4e2a\u8f74\u8ba1\u7b97A\u5143\u7d20\u7684\u7d2f\u79ef\u603b\u548c\uff0c \u6bd4\u5982axis=0\uff08\u6309\u884c\u8ba1\u7b97\uff09\uff0c\u6211\u4eec\u53ef\u4ee5\u8c03\u7528cumsum\u51fd\u6570\u3002 \u6b64\u51fd\u6570\u4e0d\u4f1a\u6cbf\u4efb\u4f55\u8f74\u964d\u4f4e\u8f93\u5165\u5f20\u91cf\u7684\u7ef4\u5ea6\u3002<\/p>\n<pre data-role=\"codeBlock\" data-info=\"py\" class=\"language-python\">A<span class=\"token punctuation\">.<\/span>cumsum<span class=\"token punctuation\">(<\/span>axis<span class=\"token operator\">=<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>\n\ntensor<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>  <span class=\"token number\">1<\/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 punctuation\">,<\/span>  <span class=\"token number\">3<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>\n        <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\">6<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">8<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>\n        <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\">15<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">.<\/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 punctuation\">,<\/span>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">24<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">28<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">32<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">36<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>\n        <span class=\"token punctuation\">[<\/span><span class=\"token number\">40<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">45<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">55<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span>\n<\/pre><h2 class=\"mume-header\" id=\"%E4%B9%98%E6%B3%95\">\u4e58\u6cd5<\/h2>\n\n<p>\u70b9\u79ef torch.dot(x,y)<br>\n\u77e9\u9635-\u5411\u91cf\u79ef torch.mv(A,x)<br>\n\u77e9\u9635-\u77e9\u9635\u4e58\u6cd5 torch.mm(A,B)<\/p>\n\n      <\/div>\n","protected":false},"excerpt":{"rendered":"<p>(\u3002\uff3f \u3002\uff09 \u270e\uff3f\u5047\u671fFLAG\uff1a\u5165\u95e8\u6df1\u5ea6\u5b66\u4e60\uff01 \u81ea\u5b66\u6559\u6750\u4e3a\u300a\u52a8\u624b\u5b66\u6df1\u5ea6\u5b66\u4e60\u300b\u4e00\u4e66\uff1a \u300a\u52a8\u624b\u5b66\u6df1\u5ea6\u5b66\u4e60\u300b \u2014 \u52a8 &hellip; <a href=\"https:\/\/www.lazybirds.top\/?p=332\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201cd2l\u81ea\u5b66\u7b14\u8bb0 &#8211; 2.\u9884\u5907\u77e5\u8bc6\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[31,20],"tags":[32,33,26,25],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/www.lazybirds.top\/index.php?rest_route=\/wp\/v2\/posts\/332"}],"collection":[{"href":"https:\/\/www.lazybirds.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lazybirds.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lazybirds.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lazybirds.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=332"}],"version-history":[{"count":2,"href":"https:\/\/www.lazybirds.top\/index.php?rest_route=\/wp\/v2\/posts\/332\/revisions"}],"predecessor-version":[{"id":334,"href":"https:\/\/www.lazybirds.top\/index.php?rest_route=\/wp\/v2\/posts\/332\/revisions\/334"}],"wp:attachment":[{"href":"https:\/\/www.lazybirds.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lazybirds.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lazybirds.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}