{"id":665,"date":"2016-05-21T19:07:44","date_gmt":"2016-05-21T19:07:44","guid":{"rendered":"http:\/\/blogs.softwareclue.com\/?p=665"},"modified":"2016-05-21T19:07:44","modified_gmt":"2016-05-21T19:07:44","slug":"%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0%e4%b8%ad%e7%9a%84%e6%a2%af%e5%ba%a6%e4%b8%8b%e9%99%8d%e6%b3%95","status":"publish","type":"post","link":"http:\/\/blog.softwareclues.com\/zh\/%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0%e4%b8%ad%e7%9a%84%e6%a2%af%e5%ba%a6%e4%b8%8b%e9%99%8d%e6%b3%95","title":{"rendered":"\u673a\u5668\u5b66\u4e60\u4e2d\u7684\u68af\u5ea6\u4e0b\u964d\u6cd5"},"content":{"rendered":"<blockquote><p><strong>\u6765\u81ea\uff1a Datartisan\u6570\u636e\u5de5\u5320\uff08\u5fae\u4fe1\u53f7: shujugongjiang\uff09<\/strong><\/p>\n<p><strong>\u94fe\u63a5\uff1ahttp:\/\/datartisan.com\/article\/detail\/99.html<\/strong><\/p><\/blockquote>\n<p>\u6700\u4f18\u5316\u95ee\u9898\u662f\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u4e00\u90e8\u5206\uff0c\u51e0\u4e4e\u6bcf\u4e00\u4e2a\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u7684\u6838\u5fc3\u90fd\u662f\u5728\u5904\u7406\u6700\u4f18\u5316\u95ee\u9898\u3002<\/p>\n<section class=\"\">\n<section class=\"\">\n<section class=\"\">\n<section><\/section>\n<section>\u672c\u6587\u4e2d\u6211\u8bb2\u4ecb\u7ecd\u4e00\u4e9b\u673a\u5668\u5b66\u4e60\u9886\u57df\u4e2d\u5e38\u7528\u7684\u4e14\u975e\u5e38\u638c\u63e1\u7684\u6700\u4f18\u5316\u7b97\u6cd5\uff0c\u770b\u5b8c\u672c\u7bc7\u6587\u7ae0\u540e\u4f60\u5c06\u4f1a\u660e\u767d\uff1a<\/section>\n<blockquote>\n<ul class=\"list-paddingleft-2\">\n<li>\u4ec0\u4e48\u662f\u68af\u5ea6\u4e0b\u964d\u6cd5\uff1f<\/li>\n<li>\u5982\u4f55\u5c06\u68af\u5ea6\u4e0b\u964d\u6cd5\u8fd0\u7528\u5230\u7ebf\u6027\u56de\u5f52\u6a21\u578b\u4e2d\uff1f<\/li>\n<li>\u5982\u4f55\u5229\u7528\u68af\u5ea6\u4e0b\u964d\u6cd5\u5904\u7406\u5927\u89c4\u6a21\u7684\u6570\u636e\uff1f<\/li>\n<li>\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u4e00\u4e9b\u6280\u5de7<\/li>\n<\/ul>\n<\/blockquote>\n<section><\/section>\n<section><\/section>\n<p>\u8ba9\u6211\u4eec\u5f00\u59cb\u5427\uff01<\/p>\n<section><\/section>\n<\/section>\n<\/section>\n<\/section>\n<section class=\"\">\n<section class=\"\">\n<section class=\"\">\n<section>\u68af\u5ea6\u4e0b\u964d\u6cd5<\/section>\n<\/section>\n<\/section>\n<\/section>\n<section class=\"\">\n<section class=\"\">\n<section class=\"\">\u68af\u5ea6\u4e0b\u964d\u6cd5\u662f\u4e00\u4e2a\u7528\u4e8e\u5bfb\u627e\u6700\u5c0f\u5316\u6210\u672c\u51fd\u6570\u7684\u53c2\u6570\u503c\u7684\u6700\u4f18\u5316\u7b97\u6cd5\u3002\u5f53\u6211\u4eec\u65e0\u6cd5\u901a\u8fc7\u5206\u6790\u8ba1\u7b97(\u6bd4\u5982\u7ebf\u6027\u4ee3\u6570\u8fd0\u7b97)\u6c42\u5f97\u51fd\u6570\u7684\u6700\u4f18\u89e3\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u68af\u5ea6\u4e0b\u964d\u6cd5\u6765\u6c42\u89e3\u8be5\u95ee\u9898\u3002<\/p>\n<\/section>\n<\/section>\n<\/section>\n<section class=\"\">\n<section class=\"\">\n<section class=\"\"><strong>\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u76f4\u89c9\u4f53\u9a8c<\/strong><\/p>\n<p>\u60f3\u8c61\u4e00\u4e2a\u4f60\u7ecf\u5e38\u7528\u6765\u5403\u8c37\u7269\u6216\u50a8\u5b58\u53d7\u8fc7\u7684\u5927\u7897\uff0c\u6210\u672c\u51fd\u6570\u7684\u5f62\u72b6\u7c7b\u4f3c\u4e8e\u8fd9\u4e2a\u7897\u7684\u9020\u578b\u3002<\/p>\n<\/section>\n<\/section>\n<\/section>\n<section class=\"\">\n<section class=\"\"><img decoding=\"async\" class=\"\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/ghbI8QDvgWv3WhepmXsHZVWCZLPAnKl2jVONROnpSNN0ryv3MDhbmlqeF3owZ0QgtiaLj95RQ9tt50zaoJrhUiag\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-ratio=\"0.8327338129496403\" data-w=\"\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/ghbI8QDvgWv3WhepmXsHZVWCZLPAnKl2jVONROnpSNN0ryv3MDhbmlqeF3owZ0QgtiaLj95RQ9tt50zaoJrhUiag\/640?wx_fmt=png\" data-type=\"png\" \/><\/section>\n<\/section>\n<section class=\"\">\n<section class=\"\">\n<section class=\"\">\u7897\u8868\u9762\u4e0a\u7684\u4efb\u4e00\u968f\u673a\u4f4d\u7f6e\u8868\u793a\u5f53\u524d\u7cfb\u6570\u5bf9\u5e94\u7684\u6210\u672c\u503c\uff0c\u7897\u7684\u5e95\u90e8\u5219\u8868\u793a\u6700\u4f18\u89e3\u96c6\u5bf9\u5e94\u7684\u6210\u672c\u51fd\u6570\u503c\u3002\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u76ee\u6807\u5c31\u662f\u4e0d\u65ad\u5730\u5c1d\u8bd5\u4e0d\u540c\u7684\u7cfb\u6570\u503c\uff0c\u7136\u540e\u8bc4\u4f30\u6210\u672c\u51fd\u6570\u5e76\u9009\u62e9\u80fd\u591f\u964d\u4f4e\u6210\u672c\u51fd\u6570\u7684\u53c2\u6570\u503c\u3002\u91cd\u590d\u8fed\u4ee3\u8ba1\u7b97\u4e0a\u8ff0\u6b65\u9aa4\u76f4\u5230\u6536\u655b\uff0c\u6211\u4eec\u5c31\u80fd\u83b7\u5f97\u6700\u5c0f\u6210\u672c\u51fd\u6570\u503c\u5bf9\u5e94\u7684\u6700\u4f18\u89e3<\/p>\n<p><strong>\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u8fc7\u7a0b<\/strong><\/p>\n<p>\u68af\u5ea6\u4e0b\u964d\u6cd5\u9996\u5148\u9700\u8981\u8bbe\u5b9a\u4e00\u4e2a\u521d\u59cb\u53c2\u6570\u503c\uff0c\u901a\u5e38\u60c5\u51b5\u4e0b\u6211\u4eec\u5c06\u521d\u503c\u8bbe\u4e3a\u96f6(coefficient=0coefficient=0)\uff0c\u63a5\u4e0b\u6765\u9700\u8981\u8ba1\u7b97\u6210\u672c\u51fd\u6570 cost=f(coefficient)cost=f(coefficient) \u6216\u8005 cost=evaluate(f(coefficient))cost=evaluate(f(coefficient))\u3002\u7136\u540e\u6211\u4eec\u9700\u8981\u8ba1\u7b97\u51fd\u6570\u7684\u5bfc\u6570(\u5bfc\u6570\u662f\u5fae\u79ef\u5206\u7684\u4e00\u4e2a\u6982\u5ff5\uff0c\u5b83\u662f\u6307\u51fd\u6570\u4e2d\u67d0\u4e2a\u70b9\u5904\u7684\u659c\u7387\u503c)\uff0c\u5e76\u8bbe\u5b9a\u5b66\u4e60\u6548\u7387\u53c2\u6570(alpha)\u7684\u503c\u3002<\/p>\n<p>coefficient=coefficient\u2212(alpha\u2217delta) coefficient=coefficient\u2212(alpha\u2217delta) \u91cd\u590d\u6267\u884c\u4e0a\u8ff0\u8fc7\u7a0b\uff0c\u76f4\u5230\u53c2\u6570\u503c\u6536\u655b\uff0c\u8fd9\u6837\u6211\u4eec\u5c31\u80fd\u83b7\u5f97\u51fd\u6570\u7684\u6700\u4f18\u89e3\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u770b\u51fa\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u601d\u8def\u591a\u4e48\u7b80\u5355\uff0c\u4f60\u53ea\u9700\u77e5\u9053\u6210\u672c\u51fd\u6570\u7684\u68af\u5ea6\u503c\u6216\u8005\u9700\u8981\u4f18\u5316\u7684\u51fd\u6570\u60c5\u51b5\u5373\u53ef\u3002\u63a5\u4e0b\u6765\u6211\u5c06\u4ecb\u7ecd\u5982\u4f55\u5c06\u68af\u5ea6\u4e0b\u964d\u6cd5\u8fd0\u7528\u5230\u673a\u5668\u5b66\u4e60\u9886\u57df\u4e2d\u3002<\/p>\n<\/section>\n<\/section>\n<\/section>\n<section class=\"\">\n<section class=\"\">\n<section class=\"\">\n<section>\u6279\u91cf\u68af\u5ea6\u4e0b\u964d\u6cd5<\/section>\n<\/section>\n<\/section>\n<\/section>\n<section class=\"\">\n<section class=\"\">\n<section class=\"\">\u6240\u6709\u7684\u6709\u76d1\u7763\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u7684\u76ee\u6807\u90fd\u662f\u5229\u7528\u5df2\u77e5\u7684\u81ea\u53d8\u91cf(X)\u6570\u636e\u6765\u9884\u6d4b\u56e0\u53d8\u91cf(Y)\u7684\u503c\u3002\u6240\u6709\u7684\u5206\u7c7b\u548c\u56de\u5f52\u6a21\u578b\u90fd\u662f\u5728\u5904\u7406\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n<section><\/section>\n<section>\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u4f1a\u5229\u7528\u67d0\u4e2a\u7edf\u8ba1\u91cf\u6765\u523b\u753b\u76ee\u6807\u51fd\u6570\u7684\u62df\u5408\u60c5\u51b5\u3002\u867d\u7136\u4e0d\u540c\u7684\u7b97\u6cd5\u62e5\u6709\u4e0d\u540c\u7684\u76ee\u6807\u51fd\u6570\u8868\u793a\u65b9\u6cd5\u548c\u4e0d\u540c\u7684\u7cfb\u6570\u503c\uff0c\u4f46\u662f\u5b83\u4eec\u62e5\u6709\u4e00\u4e2a\u5171\u540c\u7684\u76ee\u6807\u2014\u2014\u5373\u901a\u8fc7\u6700\u4f18\u5316\u76ee\u6807\u51fd\u6570\u6765\u83b7\u53d6\u6700\u4f73\u53c2\u6570\u503c\u3002<\/section>\n<section><\/section>\n<section>\u7ebf\u6027\u56de\u5f52\u6a21\u578b\u548c\u903b\u8f91\u65af\u8482\u56de\u5f52\u6a21\u578b\u662f\u5229\u7528\u68af\u5ea6\u4e0b\u964d\u6cd5\u6765\u5bfb\u627e\u6700\u4f73\u53c2\u6570\u503c\u7684\u7ecf\u5178\u6848\u4f8b\u3002<\/section>\n<section><\/section>\n<section>\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u591a\u79cd\u8861\u91cf\u65b9\u6cd5\u6765\u8bc4\u4f30\u673a\u5668\u5b66\u4e60\u6a21\u578b\u5bf9\u76ee\u6807\u51fd\u6570\u7684\u62df\u5408\u60c5\u51b5\u3002\u6210\u672c\u51fd\u6570\u6cd5\u662f\u901a\u8fc7\u8ba1\u7b97\u6bcf\u4e2a\u8bad\u7ec3\u96c6\u7684\u9884\u6d4b\u503c\u548c\u771f\u5b9e\u503c\u4e4b\u95f4\u7684\u5dee\u5f02\u7a0b\u5ea6(\u6bd4\u5982\u6b8b\u5dee\u5e73\u65b9\u548c)\u6765\u5ea6\u91cf\u6a21\u578b\u7684\u62df\u5408\u60c5\u51b5\u3002<\/section>\n<section><\/section>\n<section>\u6211\u4eec\u53ef\u4ee5\u8ba1\u7b97\u6210\u672c\u51fd\u6570\u4e2d\u6bcf\u4e2a\u53c2\u6570\u6240\u5bf9\u5e94\u7684\u5bfc\u6570\u503c\uff0c\u7136\u540e\u901a\u8fc7\u4e0a\u8ff0\u7684\u66f4\u65b0\u65b9\u7a0b\u8fdb\u884c\u8fed\u4ee3\u8ba1\u7b97\u3002<\/section>\n<section><\/section>\n<section>\u5728\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u6bcf\u4e00\u6b65\u8fed\u4ee3\u8ba1\u7b97\u540e\uff0c\u6211\u4eec\u90fd\u9700\u8981\u8ba1\u7b97\u6210\u672c\u51fd\u6570\u53ca\u5176\u5bfc\u6570\u7684\u60c5\u51b5\u3002\u6bcf\u4e00\u6b21\u7684\u8fed\u4ee3\u8ba1\u7b97\u8fc7\u7a0b\u5c31\u88ab\u79f0\u4e3a\u4e00\u6279\u6b21\uff0c\u56e0\u6b64\u8fd9\u4e2a\u5f62\u5f0f\u7684\u68af\u5ea6\u4e0b\u964d\u6cd5\u4e5f\u88ab\u79f0\u4e3a\u6279\u91cf\u68af\u5ea6\u4e0b\u964d\u6cd5\u3002<\/section>\n<section><\/section>\n<p>\u6279\u91cf\u68af\u5ea6\u4e0b\u964d\u6cd5\u662f\u673a\u5668\u5b66\u4e60\u9886\u57df\u4e2d\u5e38\u89c1\u7684\u4e00\u79cd\u68af\u5ea6\u4e0b\u964d\u65b9\u6cd5\u3002<\/p>\n<\/section>\n<\/section>\n<\/section>\n<section class=\"\">\n<section class=\"\">\n<section class=\"\">\n<section>\u968f\u673a\u68af\u5ea6\u4e0b\u964d\u6cd5<\/section>\n<\/section>\n<\/section>\n<\/section>\n<section class=\"\">\n<section class=\"\">\n<section class=\"\">\u5904\u7406\u5927\u89c4\u6a21\u7684\u6570\u636e\u65f6\uff0c\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u8fd0\u7b97\u6548\u7387\u975e\u5e38\u4f4e\u3002<\/p>\n<section><\/section>\n<section>\u56e0\u4e3a\u68af\u5ea6\u4e0b\u964d\u6cd5\u5728\u6bcf\u6b21\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u90fd\u9700\u8981\u8ba1\u7b97\u8bad\u7ec3\u96c6\u7684\u9884\u6d4b\u60c5\u51b5\uff0c\u6240\u4ee5\u5f53\u6570\u636e\u91cf\u975e\u5e38\u5927\u65f6\u9700\u8981\u8017\u8d39\u8f83\u957f\u7684\u65f6\u95f4\u3002<\/section>\n<section><\/section>\n<section>\u5f53\u4f60\u5904\u7406\u5927\u89c4\u6a21\u7684\u6570\u636e\u65f6\uff0c\u4f60\u53ef\u4ee5\u5229\u7528\u968f\u673a\u68af\u5ea6\u4e0b\u964d\u6cd5\u6765\u63d0\u9ad8\u8ba1\u7b97\u6548\u7387\u3002<\/section>\n<section><\/section>\n<section>\u8be5\u7b97\u6cd5\u4e0e\u4e0a\u8ff0\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\u5b83\u5bf9\u6bcf\u4e2a\u968f\u673a\u8bad\u7ec3\u6837\u672c\u90fd\u6267\u884c\u7cfb\u6570\u66f4\u65b0\u8fc7\u7a0b\uff0c\u800c\u4e0d\u662f\u5728\u6bcf\u6279\u6837\u672c\u8fd0\u7b97\u5b8c\u540e\u624d\u6267\u884c\u7cfb\u6570\u66f4\u65b0\u8fc7\u7a0b\u3002<\/section>\n<section><\/section>\n<section>\u968f\u673a\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u7b2c\u4e00\u4e2a\u6b65\u9aa4\u8981\u6c42\u8bad\u7ec3\u96c6\u7684\u6837\u672c\u662f\u968f\u673a\u6392\u5e8f\u7684\uff0c\u8fd9\u662f\u4e3a\u4e86\u6253\u4e71\u7cfb\u6570\u7684\u66f4\u65b0\u8fc7\u7a0b\u3002\u56e0\u4e3a\u6211\u4eec\u5c06\u5728\u6bcf\u6b21\u8bad\u7ec3\u5b9e\u4f8b\u7ed3\u675f\u540e\u66f4\u65b0\u7cfb\u6570\u503c\uff0c\u6240\u4ee5\u7cfb\u6570\u503c\u548c\u6210\u672c\u51fd\u6570\u503c\u5c06\u4f1a\u51fa\u73b0\u968f\u673a\u8df3\u8dc3\u7684\u60c5\u51b5\u3002\u901a\u8fc7\u6253\u4e71\u7cfb\u6570\u66f4\u65b0\u8fc7\u7a0b\u7684\u987a\u5e8f\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u8fd9\u4e2a\u968f\u673a\u6e38\u8d70\u7684\u6027\u8d28\u6765\u907f\u514d\u6a21\u578b\u4e0d\u6536\u655b\u7684\u95ee\u9898\u3002<\/section>\n<section><\/section>\n<section>\u9664\u4e86\u6210\u672c\u51fd\u6570\u7684\u8ba1\u7b97\u65b9\u5f0f\u4e0d\u4e00\u81f4\u5916\uff0c\u968f\u673a\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u7cfb\u6570\u66f4\u65b0\u8fc7\u7a0b\u548c\u4e0a\u8ff0\u7684\u68af\u5ea6\u4e0b\u964d\u6cd5\u4e00\u6a21\u4e00\u6837\u3002<\/section>\n<section><\/section>\n<p>\u5bf9\u4e8e\u5927\u89c4\u6a21\u6570\u636e\u6765\u8bf4\uff0c\u968f\u673a\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u6536\u655b\u901f\u5ea6\u660e\u663e\u9ad8\u4e8e\u5176\u4ed6\u7b97\u6cd5\uff0c\u901a\u5e38\u60c5\u51b5\u4e0b\u4f60\u53ea\u9700\u8981\u4e00\u4e2a\u5c0f\u7684\u8fed\u4ee3\u6b21\u6570\u5c31\u80fd\u5f97\u5230\u4e00\u4e2a\u76f8\u5bf9\u8f83\u4f18\u7684\u62df\u5408\u53c2\u6570\u3002<\/p>\n<\/section>\n<\/section>\n<\/section>\n<section class=\"\">\n<section class=\"\">\n<section class=\"\">\n<section>\u68af\u5ea6\u4e0b\u964d\u6cd5\u7684\u4e00\u4e9b\u5efa\u8bae<\/section>\n<\/section>\n<\/section>\n<\/section>\n<section>\n<section>\n<section>\n<section>\u672c\u8282\u5217\u51fa\u4e86\u51e0\u4e2a\u53ef\u4ee5\u5e2e\u52a9\u4f60\u66f4\u597d\u5730\u638c\u63e1\u673a\u5668\u5b66\u4e60\u4e2d\u68af\u5ea6\u4e0b\u964d\u7b97\u6cd5\u7684\u6280\u5de7\uff1a<\/p>\n<ul 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class=\"\">\n<section class=\"\">\n<section class=\"\">\n<section>\u603b\u7ed3\u00a0<\/section>\n<\/section>\n<\/section>\n<\/section>\n<section>\n<section>\n<section>\n<section>\u672c\u6587\u4e3b\u8981\u4ecb\u7ecd\u4e86\u673a\u5668\u5b66\u4e60\u4e2d\u7684\u68af\u5ea6\u4e0b\u964d\u6cd5\uff0c\u901a\u8fc7\u9605\u8bfb\u672c\u6587\uff0c\u4f60\u4e86\u89e3\u5230\uff1a<\/p>\n<ul 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\u94fe\u63a5\uff1ahttp:\/\/datar &hellip; <a href=\"http:\/\/blog.softwareclues.com\/zh\/%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0%e4%b8%ad%e7%9a%84%e6%a2%af%e5%ba%a6%e4%b8%8b%e9%99%8d%e6%b3%95\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span 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