{"id":554635,"date":"2022-02-12T13:42:13","date_gmt":"2022-02-12T05:42:13","guid":{"rendered":"http:\/\/4563.org\/?p=554635"},"modified":"2022-02-12T13:42:13","modified_gmt":"2022-02-12T05:42:13","slug":"%e8%af%b7%e6%95%99%e4%b8%80%e4%b8%aa%e7%a5%9e%e7%bb%8f%e7%bd%91%e7%bb%9c%e6%b1%82%e5%87%bd%e6%95%b0%e6%9c%80%e5%a4%a7%e5%80%bc%e7%9a%84%e9%97%ae%e9%a2%98-3","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=554635","title":{"rendered":"\u8bf7\u6559\u4e00\u4e2a\u795e\u7ecf\u7f51\u7edc\u6c42\u51fd\u6570\u6700\u5927\u503c\u7684\u95ee\u9898"},"content":{"rendered":"
\n
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\u8bf7\u6559\u4e00\u4e2a\u795e\u7ecf\u7f51\u7edc\u6c42\u51fd\u6570\u6700\u5927\u503c\u7684\u95ee\u9898 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/i> 74<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u6700\u8fd1\u5728\u5b66\u795e\u7ecf\u7f51\u7edc\uff0c\u5bf9\u4e8e\u76d1\u7763\u5b66\u4e60\u6765\u8bf4\uff0c\u6b65\u9aa4\u5c31\u662f\u8f93\u5165 x \uff0c\u6a21\u578b\u8f93\u51fa\u4e00\u4e2a y_pred \uff0c\u7136\u540e\u548c\u6807\u7b7e y \u8ba1\u7b97\u4e00\u4e0b loss \uff0c\u7136\u540e\u5c31\u53cd\u5411\u4f20\u64ad\u66f4\u65b0\u53c2\u6570\u3002<\/p>\n

\u90a3\u6211\u5982\u679c\u60f3\u7528\u795e\u7ecf\u7f51\u7edc\u6c42\u4e00\u4e2a\u51fd\u6570\u7684\u6700\u5927\u503c\uff0c\u662f\u4e0d\u662f\u53ef\u4ee5\u5f53\u6a21\u578b\u8f93\u51fa y_pred \u65f6\uff0c\u6211\u7528 MAX_VALUE \uff0c\u4e00\u4e2a\u5f88\u5927\u5f88\u5927\u7684\u503c\u6765\u8ddf y_pred \u8ba1\u7b97 loss \uff0c\u7136\u540e\u53cd\u5411\u4f20\u64ad\u66f4\u65b0\u53c2\u6570\uff0c\u8ba9 loss \u5c3d\u91cf\u5c0f\u3002<\/p>\n

\u6211\u4e0d\u77e5\u9053\u8fd9\u4e2a\u60f3\u6cd5\u5bf9\u4e0d\u5bf9\uff0c\u56e0\u4e3a\u6211\u627e\u4e0d\u5230\u76f8\u5173\u7684\u4ecb\u7ecd\u3002<\/p>\n

\u91cd\u65b0\u60f3\u4e86\u4e00\u4e0b\uff0c\u662f\u4e0d\u662f\u53ef\u4ee5\u628a\u8fd9\u4e2a\u51fd\u6570\u76f4\u63a5\u52a0\u4e2a\u8d1f\u53f7\uff0c\u76f4\u63a5\u5f53\u6210 loss \u5c31\u884c\u4e86\uff1f<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (36<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Joshua999 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6c42\u6700\u5927\u503c\u5e94\u8be5\u4e0d\u9700\u8981\u795e\u7ecf\u7f51\u7edc\u5427\uff0c\u8bb0\u5f97\u597d\u50cf\u6709\u4ec0\u4e48\u725b\u987f\u6cd5\uff0c\u9000\u706b\u6cd5\u3002\u7528\u795e\u7ecf\u7f51\u7edc\u7684\u8bdd\uff0c\u662f\u6700\u5927\u503c\u4e86\u5c31 1 \uff0c\u4e0d\u662f\u6700\u5927\u503c\u4e86\u5c31 0 \u5457 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Xs0ul <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6309\u4f60\u7684\u60f3\u6cd5\uff0c\u6a21\u578b\u5b66\u5230\u7684\u9884\u6d4b\u503c\u5c31\u662f MAX_VALUE \uff0c\u5e76\u4e0d\u80fd\u5b9e\u73b0\u9884\u6d4b\u67d0\u4e2a\u51fd\u6570\u6700\u503c\u7684\u6548\u679c <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f60\u80fd\u4e0d\u80fd\u628a\u4f60\u7684\u539f\u59cb\u95ee\u9898\u8bf4\u4e00\u8bf4\u3002
    \u8fd9\u4f30\u8ba1\u4e5f\u662f\u4e2a XY problem <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : rpman <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f60\u8fd9\u6837 y_pred \u903c\u8fd1\u7684\u5c31\u662f MAX_VALUE
    \u4f60\u60f3\u903c\u8fd1\u7684\u5176\u5b9e\u5c31\u662f max(x) <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : GuuJiang <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5e76\u4e0d\u80fd\uff0c\u795e\u7ecf\u7f51\u7edc\u89e3\u51b3\u7684\u95ee\u9898\u662f
    \u6c42**\u4e00\u4e2a\u51fd\u6570**\uff0c\u4f7f\u5176\u5bf9\u4e8e\u6d4b\u8bd5\u96c6\u7684\u8f93\u5165\u5f97\u5230\u7684\u8f93\u51fa\u503c(\u5373 loss)\u6700\u5c0f
    \u800c\u4f60\u60f3\u8981\u89e3\u51b3\u7684\u95ee\u9898\u662f
    \u5bf9\u4e8e\u4e00\u4e2a**\u5df2\u77e5\u7684\u51fd\u6570**\uff0c\u6c42\u5176\u5728\u5b9a\u4e49\u57df\u4e0a\u7684\u6700\u5927\u503c
    \u770b\u51fa\u533a\u522b\u4e86\u5427\uff1f\u95ee\u9898\u7684\u5173\u952e\u4e0d\u5728\u4e8e\u6700\u5c0f\u548c\u6700\u5927\u7684\u533a\u522b\uff0c\u5047\u5982\u4ec5\u4ec5\u662f\u6700\u5c0f\u548c\u6700\u5927\u7684\u533a\u522b\u7684\u8bdd\u786e\u5b9e\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e9b\u624b\u6bb5\u628a\u6700\u5927\u503c\u95ee\u9898\u53d8\u4e3a\u6700\u5c0f\u503c\u95ee\u9898\uff0c\u800c\u4f60\u8fd9\u91cc\u538b\u6839\u5c31\u662f\u4e24\u4e2a\u5b8c\u5168\u4e0d\u4e00\u6837\u7684\u95ee\u9898
    BTW \uff0c\u4f60\u8fd9\u4e2a\u60f3\u6cd5\u8ba9\u6211\u60f3\u5230\u4e86\u4e00\u4e9b\u521a\u5f00\u59cb\u5b66\u7f16\u7a0b\u7684\u521d\u5b66\u8005\u8bd5\u56fe\u901a\u8fc7\u8d4b\u503c\u8bed\u53e5\u6765\u8fbe\u5230\u89e3\u65b9\u7a0b\u7684\u76ee\u7684\uff0c\u8fd9\u4e24\u79cd\u573a\u666f\u975e\u5e38\u76f8\u4f3c\uff0c\u90fd\u662f\u6709\u4e24\u4e2a\u95ee\u9898 A \u548c B \uff0c\u4e4d\u4e00\u770b\u63cf\u8ff0\u975e\u5e38\u76f8\u4f3c\uff0c\u5b9e\u9645\u4e0a\u662f\u5b8c\u5168\u4e0d\u540c\u7684\u95ee\u9898 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Xs0ul <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8bd5\u56fe\u7406\u89e3\u4e86\u4e00\u4e0b\u4e3b\u60f3\u95ee\u4ec0\u4e48\uff1a
    1. \u4e00\u822c\u7684\u673a\u5668\u5b66\u4e60\u95ee\u9898\u662f\uff0c\u5df2\u6709\u4e00\u7ec4\u89c2\u6d4b\u5230\u7684 xy \u548c\u7531\u672a\u77e5\u53c2\u6570 w \u5b9a\u4e49\u7684\u51fd\u6570\uff0c\u6c42\u6700\u4f18\u7684 w \u4f7f\u51fd\u6570\u9884\u6d4b\u7684 y \u4e0e\u5b9e\u9645\u7684 y \u5dee\u8ddd\u6700\u5c0f\u3002
    2. \u8ba9\u6a21\u578b\u81ea\u52a8\u627e\u67d0\u7c7b\u51fd\u6570\u7684\u6700\u5927\u503c\u4e5f\u53ef\u4ee5\uff0c\u6bd4\u5982\u4e00\u5806\u7531 x=(a,b,c)\u5b9a\u4e49\u7684\u4e8c\u6b21\u51fd\u6570\u548c\u5bf9\u5e94\u7684\u4e8c\u6b21\u51fd\u6570\u7684\u6700\u503c y \uff0c\u795e\u7ecf\u7f51\u7edc\u591f\u590d\u6742\u6216\u8005\u6070\u597d\u7528\u5230\u6b63\u786e\u7684\u5c42\uff0c\u53ef\u4ee5\u62df\u5408\u51fa\u6c42\u6700\u503c\u7684\u516c\u5f0f\uff08\u4e8c\u6b21\u51fd\u6570\uff09\u3002
    3. \u4e3b\u60f3\u95ee\u7684\u597d\u50cf\u628a 1 \u548c 2 \u6df7\u5728\u4e86\u4e00\u8d77\uff0c\u8f93\u5165\u662f 1. \u4f46\u8f93\u51fa\u662f 2.\uff0c\u8fd9\u53ea\u8981 max()\u5c31\u884c\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5c31\u662f\u6709\u4e2a\u4f5c\u4e1a \u7ed9\u4e00\u4e2a\u51fd\u6570\u6bd4\u5982 y=f(x)\uff0cx \u7684\u53d6\u503c\u662f\u6709\u9650\u7684\uff0c\u786e\u5b9a\u7684\uff0c\u6bd4\u5982[x1=1 x2=5 x3=4 …]\uff0c\u7136\u540e f(x)\u662f\u4e00\u4e2a\u795e\u7ecf\u7f51\u7edc\uff0c\u7f51\u7edc\u7ed3\u6784\u4e5f\u7ed9\u597d\u4e86\uff0c\u5c31\u662f\u4e00\u4e2a\u4e24\u4e2a\u7ebf\u6027\u5c42\u548c\u4e00\u4e2a\u6fc0\u6d3b\u51fd\u6570\u3002
    \u7136\u540e\u8981\u8bad\u7ec3\u8fd9\u4e2a\u7f51\u7edc\uff0c\u6700\u5927\u5316 y \u7684\u503c\u3002
    @Joshua999
    @Xs0ul
    @ipwx
    @rpman
    @GuuJiang
    @Xs0ul <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    1 \u3001\u4f60\u8981\u8bad\u7ec3\u7684\u662f f(x) \u672c\u8eab\uff1f f(x) \u53ef\u53d8\uff1f
    2 \u3001\u90a3\u8bad\u7ec3\u4e86\u4e4b\u540e y=f(x) \u5c31\u53d8\u4e86\u554a\u3002\u3002\u3002\u5b83\u53ef\u4ee5\u53d8\u6210\u4efb\u4f55\u4e1c\u897f\u3002\u4f60\u6709\u8bad\u7ec3\u76ee\u6807\u5417\uff1f\u5c31\u662f t[x] = f(x) \u7684\u6b63\u786e\u7b54\u6848 t[x]\u3002
    3 \u3001\u6ca1\u6709\u76ee\u6807\u53bb\u8bad\u7ec3\uff0c\u5b83\u53ef\u4ee5\u53d8\u6210\u4efb\u4f55\u503c\u554a\u3002
    \u4e3b\u80fd\u4e0d\u80fd\u7528\u6570\u5b66\u8bed\u8a00\u5f62\u5f0f\u5316\u4e00\u4e0b\u4f60\u7684\u95ee\u9898\uff0c\u6211\u65e0\u6cd5\u7406\u89e3\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8fd8\u6709\uff0c\u4e24\u4e2a\u7ebf\u6027\u5c42\u548c\u4e00\u4e2a\u6fc0\u6d3b\u5c42\u5b83\u987a\u5e8f\u5230\u5e95\u662f\u5565\uff1f
    y = A2*(u(A1*x+b1)) + b2 \uff1f
    \u5982\u679c\u662f y = u(A2*(A1*x+b1)+b2) \u90a3\u662f\u6ca1\u6709\u7528\u7684\u3002\u4e24\u4e2a\u7ebf\u6027\u5c42\u548c\u4e00\u4e2a\u7ebf\u6027\u5c42\u6ca1\u6709\u533a\u522b\uff08\u53c2\u6570\u53ef\u4ee5\u8bad\u7ec3\u7684\u60c5\u51b5\u4e0b\uff09 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8fd9\u79cd\u4e1c\u897f\u4e0d\u80fd\u9760\u53d9\u8ff0\uff0c\u5b83\u6839\u672c\u4e0d\u7cbe\u786e\u3002\u4e0a\u516c\u5f0f\u554a\u5582 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ipwx \u5c31\u662f\u6709\u4e00\u4e2a\u5f0f\u5b50 y=xxxxx \u6211\u6253\u4e0d\u51fa\u6765\uff0c\u91cc\u9762\u6709\u4e00\u90e8\u5206\u662f\u4e00\u4e2a\u795e\u7ecf\u7f51\u7edc\uff0c\u7136\u540e\u73b0\u5728\u8981\u8bad\u7ec3\u8fd9\u4e2a\u795e\u7ecf\u7f51\u7edc\u7684\u53c2\u6570\u4f7f\u5f97\u8fd9\u4e2a\u5f0f\u5b50\u7684\u503c\u6700\u5927\u3002
    \u8fd9\u4e2a\u5f0f\u5b50\u662f\u4e0d\u662f\u5c31\u76f8\u5f53\u4e8e\u6709\u6807\u7b7e\u7684\u5b66\u4e60\u91cc\u9762 loss function \u7684\u6982\u5ff5 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zxCoder \u4e0d\u662f\uff0c\u90a3\u4f60\u7684\u76ee\u6807\u5230\u5e95\u662f\u4ec0\u4e48\u3002\u3002\u3002
    \u4f60\u4e00\u76f4\u5728\u8bf4\u503c\u6700\u5927\uff0c\u4f46\u662f\u4e0d\u53ef\u80fd\u6ca1\u6709\u76ee\u6807\u554a\uff1f\u6ca1\u76ee\u6807\u4f60\u6839\u672c\u4e0d\u662f\u6709\u76d1\u7763\uff08\u4f60\u8bf4\u7684\u6709\u6807\u7b7e\uff09\u5b66\u4e60\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    so \u4f60\u662f\u4e0d\u662f\u60f3\u8981 max L=sum_x f(x) <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5bf9\u4e8e\u5355\u72ec\u7684 for any x, max f(x) \u8fd9\u4e2a\u95ee\u9898\u4f3c\u4e4e\u5c31\u6ca1\u6709\u610f\u4e49\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zxCoder \u4f60\u770b\uff0c\u8fd9\u4e0d\u662f y=xxxxxx \u6211\u9700\u8981\u770b\u4f60\u6570\u5b66\u516c\u5f0f\u7684\u5f62\u5f0f\u5316\uff0c\u800c\u662f\u95ee\u4f60\uff0c\u4f60\u7684\u201c\u6700\u5927\u5316\u4e00\u4e2a\u51fd\u6570\u201d\u5230\u5e95\u5f62\u5f0f\u5316\u662f\u4ec0\u4e48\u610f\u601d\u3002\u6211\u7ed9\u4e86\u4e24\u4e2a\u5f62\u5f0f\uff1a
    max sum_x f(x)
    for any x, max f(x)
    \u6240\u4ee5\u4f60\u662f\u54ea\u4e2a\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ipwx \u6211\u4ece\u6765\u6ca1\u8bf4\u8fc7\u662f\u6709\u6807\u7b7e\u5b66\u4e60\u7684\u554a\u3002\u3002\u3002\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zxCoder \u90a3\u884c\uff0c\u6240\u4ee5\u4f60\u7684\u95ee\u9898\u662f\u54ea\u4e2a
    max sum_x f(x)
    for any x, max f(x) <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ipwx \u6211\u770b\u4e0d\u592a\u61c2\u4f60\u4e0b\u9762\u7684\u610f\u601d\u3002\u4e0d\u77e5\u9053\u600e\u4e48\u63cf\u8ff0\u4e86\u3002\u3002\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ipwx \u5e94\u8be5\u662f\u7b2c\u4e8c\u79cd <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zxCoder \u90a3\u8fd9\u4e2a\u95ee\u9898\u7684\u5b9a\u4e49\u5f88\u5947\u602a\uff0c\u56e0\u4e3a\u5bf9\u4e8e\u4e00\u4e2a\u8db3\u591f\u5bbd\u7684\u3001\u4e00\u4e2a\u975e\u7ebf\u6027\u5c42\u7684\u795e\u7ecf\u7f51\u7edc\uff0c\u53ef\u4ee5\u62df\u5408\u4efb\u4f55\u5b9e\u6570\u57df\u4e0a\u7684\u53ef\u6d4b\u51fd\u6570\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c
    \u5bf9\u4e8e\u4efb\u4f55 C \uff0cf(x) \u6052\u7b49\u4e8e C
    \u662f\u4f60\u8fd9\u4e2a\u795e\u7ecf\u7f51\u7edc\u53ef\u4ee5\u62df\u5408\u7684\u51fd\u6570\u3002
    \u6700\u7ec8\u4f60\u4f1a\u5f97\u5230\u4e00\u4e2a meaningless \u7684\u51fd\u6570\uff0cC \u5728\u8bad\u7ec3\u8fc7\u7a0b\u4e2d\u4e0d\u65ad\u88ab\u63a8\u5411\u8d1f\u65e0\u7a77\uff08\u6216\u8005\u6b63\u65e0\u7a77\uff09 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u9664\u975e\u4f60\u7684 f(x) \u6709\u503c\u57df\uff0c\u90a3\u4e48\u8fd9\u4e2a\u51fd\u6570\u4f1a\u88ab\u63a8\u5411\u4e0b\u754c\uff08\u6216\u8005\u4e0a\u754c\uff09\u3002
    \u4e3a\u4e86\u907f\u514d f(x) \u9000\u5316\u6210\u5e38\u503c\u51fd\u6570\uff0c\u4f60\u7684\u8bad\u7ec3\u76ee\u6807\u6216\u8005\u7f51\u7edc\u7ed3\u6784\u5fc5\u987b\u628a\u6570\u636e\u4e4b\u95f4\u7684\u5173\u8054\u6027\u53d1\u6398\u51fa\u6765\u3002\u3002\u3002\u6240\u4ee5\u4f60\u8fd9\u4e2a\u95ee\u9898\u662f\u4e0d\u662f\u771f\u7684\u4e0d\u5bf9\u5934\uff0c\u4e0d\u597d\u8bf4\uff0c\u5f97\u770b\u4f60\u7684\u95ee\u9898\u6570\u636e\u672c\u8eab\u662f\u4ec0\u4e48\u6837\u5b50\uff0c\u4ee5\u53ca\u795e\u7ecf\u7f51\u7edc\u662f\u4ec0\u4e48\u6837\u5b50\u3002
    \u4f46\u662f\u5728\u6211\u7684\u7ecf\u9a8c\u4e2d\uff0cfor any x, max f(x) \u5f88\u5c11\u89c1\u3002\u81f3\u5c11\u4e5f\u662f max E[f(x)] <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ipwx max E[f(x)] \u5927\u4f6c\u53ef\u4ee5\u8bb2\u4e00\u4e0b\u8fd9\u4e2a\u5417\uff0c\u6216\u8005\u7ed9\u6211\u70b9\u53c2\u8003\u8d44\u6599\u3002\u6211\u4e0d\u77e5\u9053\u5982\u4f55\u4e0b\u624b <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zxCoder \u6bcf\u4e2a mini-batch
    \u968f\u673a\u91c7\u6837\uff0c\u8ba1\u7b97 f(x[i]) \u7136\u540e\u6c42\u5e73\u5747\u3002\u63a5\u7740\u68af\u5ea6\u4e0b\u964d -(sum f(x[i]))\/N <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ipwx \u770b\u4e0d\u61c2\u6709\u4ec0\u4e48\u533a\u522b\u554a\u3002\u8fd9\u91cc\u662f\u7b97\u6709\u76d1\u7763\u5b66\u4e60\u5417\uff1f\u90a3\u54ea\u4e2a\u662f loss <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Xs0ul <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e3b\u4e0d\u5982\u76f4\u63a5\u4f5c\u4e1a\u622a\u56fe\u6216\u8005\u62cd\u4e2a\u7167\u53d1\u4e0a\u6765\uff0c\u611f\u89c9\u8d8a\u8bf4\u8d8a\u7cca\u6d82\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u95ee\u4e86\u4e00\u4e0b\u540c\u5b66\uff0c\u9898\u76ee\u662f\u8fd9\u6837
    f(x)=g(a)\u7684\u671f\u671b a \u5c5e\u4e8e q
    q \u662f\u4e00\u4e2a\u795e\u7ecf\u7f51\u7edc\u6ee1\u8db3\u4e00\u4e2a\u5206\u5e03
    \u76ee\u6807\u662f\u6700\u5927\u5316 f(x)\u7684\u503c
    @ipwx
    @Xs0ul
    \u5927\u4f6c\u4eec\u5e2e\u5fd9\u770b\u770b <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f60\u8fd9\u5f62\u5f0f\u5316\u8fd8\u662f\u4e0d\u592a\u5bf9\u52b2\u3002\u4f60\u80fd\u4e0d\u80fd\u4f5c\u4e1a\u62cd\u4e2a\u7167\u622a\u4e2a\u56fe\u3002
    f(x) = g(a) \u8fd9\u4e2a\u80af\u5b9a\u6709\u95ee\u9898\u3002
    f(x) = E_a[g(x,a)], a ~ q(a) \u6216\u8005 a~q(a|x) \u90a3\u6211\u8fd8\u80fd\u7406\u89e3\u3002
    —-
    \u53e6\u5916\u7528 a \u6765\u8868\u793a\u5206\u5e03\u53d8\u91cf\uff0c\u4f60\u8fd9\u662f\u5728\u505a Reinforcement learning \u7684 action network \u5417\uff1f
    \u8fd9\u6837\u7684\u8bdd\u4f60\u9700\u8981\u7528 REINFORCE \u7b97\u6cd5\u53bb\u8499\u7279\u5361\u6d1b\u91c7\u6837 a \u3002\u5f53\u7136\u5177\u4f53\u8bf7\u53c2\u7167 RL \u7684\u6700\u65b0\u6587\u7ae0\uff0c\u6211\u4e0d\u662f\u4e13\u95e8\u505a RL \u7684\u3002
    \u4e0d\u7ba1\u600e\u4e48\u6837\u5982\u679c\u4f60\u7684\u76ee\u7684\u662f\u4f18\u5316 f(x)\uff0c\u90a3\u4e48\u4f60\u7684 loss \u5e94\u8be5\u662f
    L = E_x[E_a[g(x,a)]]
    \u5176\u4e2d x ~ p(x) \u662f\u6570\u636e\u5206\u5e03\uff0ca ~ q(a) \u6216\u8005 q(a|x) \u662f action network \u5bfc\u51fa\u7684\u5206\u5e03\u3002\u5f53\u7136\u4e00\u822c\u800c\u8a00\u6211\u89c9\u5f97 q(a) \u5e94\u8be5\u662f\u6709\u6761\u4ef6\u6982\u7387 q(a|x) \u7684\u3002
    max L \u5c31\u68af\u5ea6\u4e0b\u964d min -L <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u987a\u4fbf L = E_x[f(x)] \u662f\u795e\u7ecf\u7f51\u7edc\u5f88\u666e\u9002\u7684\u5199\u6cd5\uff0c\u8868\u793a\u7684\u662f x \u4ece\u5168\u90e8\u8bad\u7ec3\u96c6\u4e0a\u91c7\u6837\uff08\u4e5f\u5c31\u662f mini-batch \uff09\uff0cE_x \u5c31\u662f mini-batch \u4e0a\u6240\u6709 f(x) \u7684\u5e73\u5747\uff0c\u8fd9\u4e2a\u5728\u4ee3\u7801\u91cc\u9762\u4e5f\u5f88\u5e38\u89c1\u624d\u5bf9\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ipwx \u5e73\u5747\u503c\u4e3a\u4ec0\u4e48\u80fd\u505a loss \u554a loss \u4e0d\u662f\u9884\u6d4b\u503c\u548c\u771f\u5b9e\u503c\u7684\u5dee\u8ddd\u5417 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zxCoder \u55ef\uff0c\u518d\u5f15\u5165\u4e00\u4e2a\u65b0\u7684\u8bb0\u53f7\uff0cl(x)
    \u5728\u56de\u5f52\u4efb\u52a1\u4e2d\uff0cl(x) = f(x) – t[x]
    \u5176\u4e2d f(x) \u662f\u795e\u7ecf\u7f51\u7edc\u8f93\u51fa\uff0ct[x] \u662f x \u5bf9\u5e94\u7684\u6807\u6ce8\uff08 label \uff09\u3002
    \u90a3\u4e48 L = E_x[l(x)]
    \u5c31\u7b97\u662f\u666e\u666e\u901a\u901a\u7684\u56de\u5f52\u4efb\u52a1\u8fd8\u662f\u6709\u8fd9\u4e2a E_x \u3002\u53ea\u662f\u73b0\u5728\u7684\u4eba\u4e0a\u624b\u90fd\u662f pytorch \u6846\u67b6\uff0c\u76f4\u63a5\u5199 loss=’mse’\uff0c\u6ca1\u770b\u89c1\u5b83\u6e90\u4ee3\u7801\u91cc\u9762\u7684\u6c42\u5e73\u5747\u800c\u5df2\u3002\u3002\u3002\u800c\u8fd9\u4e2a\u6c42\u5e73\u5747\u7684\u6570\u5b66\u610f\u4e49\u662f\u8499\u7279\u5361\u6d1b\u91c7\u6837
    E_x[f(x)] \u7ea6\u7b49\u4e8e 1\/N f(x[i]), x[i] \u662f \u7b2c i \u4e2a\u4ece p(x) \u4e0a\u91c7\u5230\u7684\u6837\u672c\u3002
    \u5982\u679c x \u662f\u8bad\u7ec3\u96c6\u6570\u636e\uff0c\u90a3\u4e48\u91c7\u6837\u53ea\u9700\u8981\u53d6\u4e00\u4e2a mini-batch \u5c31\u884c\u4e86\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u66f4\u6b63\uff1a\u5728\u56de\u5f52\u4efb\u52a1\u4e2d\uff0cl(x) = (f(x) – t[x])^2 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u66f4\u6b63\uff1aE_x[f(x)] \u7ea6\u7b49\u4e8e 1\/N sum_i f(x[i]), x[i] \u662f \u7b2c i \u4e2a\u4ece p(x) \u4e0a\u91c7\u5230\u7684\u6837\u672c\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Joshua999 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zxCoder fx \u662f\u4e24\u4e2a\u7ebf\u6027\u5c42\u52a0\u4e00\u4e2a\u6fc0\u6d3b\u51fd\u6570\uff0c\u6700\u5927\u5316\u8f93\u51fa\u3002\u90a3\u5c31\u76f4\u63a5\u628a\u7ebf\u6027\u5c42\u7cfb\u6570 w \u8bbe\u4e3a 0 \uff0c\u504f\u7f6e b \u8bbe\u6700\u5927\uff08\u6216\u8005\u6fc0\u6d3b\u51fd\u6570\u7684\u6700\u5927\u70b9\uff09\u3002\u4e0d\u7ba1\u8f93\u5165\u4ec0\u4e48\uff0c\u90fd\u662f\u6700\u5927\u503c <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ipwx \u5927\u4f6c \u6309\u4f60\u8bf4\u7684\u73b0\u5728\u6709 f(x) = E_a[g(x,a)]\uff0c\u7136\u540e a \u6ee1\u8db3\u4e00\u4e2a\u5206\u5e03\uff0c\u7136\u540e\u8981\u6700\u5927\u5316 f(x)\uff0c\u6211\u8fd8\u662f\u6ca1\u61c2\u4e3a\u4ec0\u4e48 L = E_x[E_a[g(x,a)]] <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zxCoder \u4f60\u53bb\u628a deep learning \u8fd9\u672c\uff08\u82f1\u6587\u4e66\uff09\u5b66\u4e00\u904d\u5427\u6c42\u4f60\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ipwx \u3002\u3002\u3002\u6211\u4e0d\u95ee\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    \u8bf7\u6559\u4e00\u4e2a\u795e\u7ecf\u7f51\u7edc\u6c42\u51fd\u6570\u6700\u5927\u503c\u7684\u95ee\u9898…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/554635"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=554635"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/554635\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=554635"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=554635"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=554635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}