{"id":34200,"date":"2025-04-29T09:13:49","date_gmt":"2025-04-29T01:13:49","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/34200.html"},"modified":"2025-04-29T09:13:49","modified_gmt":"2025-04-29T01:13:49","slug":"%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0%ef%bc%889%ef%bc%89-%e9%9a%8f%e6%9c%ba%e6%a3%ae%e6%9e%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/34200.html","title":{"rendered":"\u673a\u5668\u5b66\u4e60\uff089\uff09\u2014\u2014\u968f\u673a\u68ee\u6797"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>1. \u968f\u673a\u68ee\u6797\u7684\u57fa\u672c\u539f\u7406\u60f3<\/li>\n<li>2. \u7b97\u6cd5\u6d41\u7a0b<\/li>\n<li>\n<ul>\n<li>2.1. \u6570\u636e\u91c7\u6837&#xff08;Bootstrap&#xff09;&#xff1a;<\/li>\n<li>2.2. \u6784\u5efa\u51b3\u7b56\u6811&#xff1a;<\/li>\n<li>2.3. \u805a\u5408\u9884\u6d4b&#xff1a;<\/li>\n<\/ul>\n<\/li>\n<li>3. \u968f\u673a\u68ee\u6797\u7684\u6784\u5efa\u8fc7\u7a0b<\/li>\n<li>\n<ul>\n<li>3.1. \u6570\u636e\u96c6\u7684\u968f\u673a\u62bd\u6837<\/li>\n<li>3.2. \u51b3\u7b56\u6811\u7684\u8bad\u7ec3<\/li>\n<li>3.3. \u6811\u7684\u751f\u957f<\/li>\n<li>3.4. \u591a\u68f5\u6811\u7684\u96c6\u6210<\/li>\n<li>3.5. \u8f93\u51fa\u9884\u6d4b\u7ed3\u679c<\/li>\n<\/ul>\n<\/li>\n<li>4. \u968f\u673a\u68ee\u6797\u7684\u5173\u952e\u53c2\u6570<\/li>\n<li>5. \u6570\u5b66\u539f\u7406<\/li>\n<li>6. \u968f\u673a\u68ee\u6797\u7684\u4f18\u7f3a\u70b9<\/li>\n<li>7. \u7279\u5f81\u91cd\u8981\u6027\u8bc4\u4f30<\/li>\n<li>8. \u968f\u673a\u68ee\u6797\u7684\u5e94\u7528<\/li>\n<li>9. \u6837\u4f8b\u4ee3\u7801<\/li>\n<li>10. \u5982\u4f55\u63d0\u5347\u968f\u673a\u68ee\u6797\u7684\u6027\u80fd<\/li>\n<li>11. \u5c0f\u7ed3<\/li>\n<\/ul>\n<h2>1. \u968f\u673a\u68ee\u6797\u7684\u57fa\u672c\u539f\u7406\u60f3<\/h2>\n<p>\u968f\u673a\u68ee\u6797&#xff08;Random Forest&#xff09;\u662f\u4e00\u79cd\u96c6\u6210\u5b66\u4e60&#xff08;Ensemble Learning&#xff09;\u65b9\u6cd5&#xff0c;\u5c5e\u4e8e\u76d1\u7763\u5b66\u4e60\u7684\u4e00\u79cd&#xff0c;\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5206\u7c7b\u548c\u56de\u5f52\u4efb\u52a1\u3002\u5b83\u901a\u8fc7\u6784\u5efa\u591a\u4e2a\u51b3\u7b56\u6811&#xff08;Decision Tree&#xff09;&#xff0c;\u5e76\u901a\u8fc7\u96c6\u6210\u5b66\u4e60\u7684\u601d\u60f3&#xff0c;\u6700\u7ec8\u8f93\u51fa\u591a\u4e2a\u51b3\u7b56\u6811\u7684\u7ed3\u679c\u7684\u5e73\u5747\u503c\u6216\u591a\u6570\u6295\u7968\u7ed3\u679c&#xff0c;\u4ece\u800c\u63d0\u9ad8\u6a21\u578b\u7684\u51c6\u786e\u6027\u548c\u7a33\u5b9a\u6027<\/p>\n<p>\u968f\u673a\u68ee\u6797\u7684\u6838\u5fc3\u601d\u60f3\u662f\u901a\u8fc7\u6784\u5efa\u591a\u4e2a\u51b3\u7b56\u6811&#xff0c;\u5e76\u7ed3\u5408\u5b83\u4eec\u7684\u7ed3\u679c\u6765\u8fdb\u884c\u9884\u6d4b\u3002\u4e0e\u5355\u4e00\u7684\u51b3\u7b56\u6811\u76f8\u6bd4&#xff0c;\u968f\u673a\u68ee\u6797\u5728\u5904\u7406\u590d\u6742\u7684\u4efb\u52a1\u65f6\u80fd\u591f\u663e\u8457\u63d0\u9ad8\u9884\u6d4b\u6027\u80fd\u3002\u5b83\u901a\u8fc7\u96c6\u6210\u4e0d\u540c\u7684\u5f31\u5206\u7c7b\u5668&#xff08;\u51b3\u7b56\u6811&#xff09;\u6765\u5f62\u6210\u4e00\u4e2a\u5f3a\u5206\u7c7b\u5668\u3002<\/p>\n<p>\u968f\u673a\u68ee\u6797\u901a\u8fc7\u4ee5\u4e0b\u4e24\u4e2a\u4e3b\u8981\u65b9\u9762\u5f15\u5165\u968f\u673a\u6027&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u968f\u673a\u91c7\u6837\u6570\u636e&#xff1a;\u5bf9\u4e8e\u6bcf\u68f5\u51b3\u7b56\u6811&#xff0c;\u5728\u8bad\u7ec3\u65f6\u4ece\u539f\u59cb\u6570\u636e\u96c6\u4e2d\u8fdb\u884c\u6709\u653e\u56de\u7684\u968f\u673a\u62bd\u6837&#xff0c;\u8fd9\u79cd\u65b9\u6cd5\u79f0\u4e3aBootstrap\u62bd\u6837&#xff08;Bootstrap sampling&#xff09;\u3002\u4e5f\u5c31\u662f\u8bf4&#xff0c;\u6bcf\u68f5\u6811\u4f7f\u7528\u7684\u6570\u636e\u96c6\u662f\u4ece\u539f\u59cb\u6570\u636e\u4e2d\u968f\u673a\u9009\u62e9\u7684&#xff0c;\u4e14\u6709\u53ef\u80fd\u91cd\u590d\u62bd\u53d6\u67d0\u4e9b\u6570\u636e\u70b9\u3002<\/p>\n<\/li>\n<li>\n<p>\u968f\u673a\u9009\u62e9\u7279\u5f81&#xff1a;\u5728\u6bcf\u4e2a\u51b3\u7b56\u6811\u7684\u6bcf\u4e2a\u8282\u70b9&#xff0c;\u9009\u62e9\u4e00\u4e2a\u968f\u673a\u7684\u7279\u5f81\u5b50\u96c6\u6765\u8fdb\u884c\u5206\u88c2&#xff0c;\u800c\u4e0d\u662f\u4f7f\u7528\u6240\u6709\u7279\u5f81\u3002\u8fd9\u79cd\u505a\u6cd5\u51cf\u5c11\u4e86\u4e0d\u540c\u51b3\u7b56\u6811\u4e4b\u95f4\u7684\u76f8\u5173\u6027&#xff0c;\u589e\u5f3a\u4e86\u6a21\u578b\u7684\u591a\u6837\u6027\u3002<\/p>\n<\/li>\n<\/ul>\n<h2>2. \u7b97\u6cd5\u6d41\u7a0b<\/h2>\n<h3>2.1. \u6570\u636e\u91c7\u6837&#xff08;Bootstrap&#xff09;&#xff1a;<\/h3>\n<ul>\n<li>\u4ece\u539f\u59cb\u6570\u636e\u96c6 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>          D <\/p>\n<p>         D <\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">D<\/span><\/span><\/span><\/span><\/span> \u4e2d\u6709\u653e\u56de\u5730\u62bd\u53d6 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>          n <\/p>\n<p>         n <\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">n<\/span><\/span><\/span><\/span><\/span> \u4e2a\u6837\u672c&#xff0c;\u751f\u6210 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>          T <\/p>\n<p>         T <\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">T<\/span><\/span><\/span><\/span><\/span> \u4e2a\u5b50\u96c6 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>           D <\/p>\n<p>           1 <\/p>\n<p>          , <\/p>\n<p>           D <\/p>\n<p>           2 <\/p>\n<p>          , <\/p>\n<p>          \u2026 <\/p>\n<p>          , <\/p>\n<p>           D <\/p>\n<p>           T <\/p>\n<p>         D_1,D_2,\u2026,D_T <\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8778em;vertical-align: -0.1944em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">D<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.3011em\"><span class=\"\" style=\"top: -2.55em;margin-left: -0.0278em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.15em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">D<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.3011em\"><span class=\"\" style=\"top: -2.55em;margin-left: -0.0278em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.15em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"minner\">\u2026<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">D<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.3283em\"><span class=\"\" style=\"top: -2.55em;margin-left: -0.0278em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\" style=\"margin-right: 0.1389em\">T<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.15em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<\/ul>\n<h3>2.2. \u6784\u5efa\u51b3\u7b56\u6811&#xff1a;<\/h3>\n<ul>\n<li>\u5bf9\u6bcf\u4e2a\u5b50\u96c6 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>           D <\/p>\n<p>           i <\/p>\n<p>         D_i <\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8333em;vertical-align: -0.15em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">D<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.3117em\"><span class=\"\" style=\"top: -2.55em;margin-left: -0.0278em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">i<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.15em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;\u8bad\u7ec3\u4e00\u68f5\u51b3\u7b56\u6811 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>           h <\/p>\n<p>           i <\/p>\n<p>         h_i <\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8444em;vertical-align: -0.15em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\">h<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.3117em\"><span class=\"\" style=\"top: -2.55em;margin-left: 0em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">i<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.15em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>&#xff1a; <\/p>\n<ul>\n<li>\u5728\u6bcf\u4e2a\u8282\u70b9\u5206\u88c2\u65f6&#xff0c;\u4ece <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>            m <\/p>\n<p>           m <\/p>\n<p>       <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">m<\/span><\/span><\/span><\/span><\/span> \u4e2a\u7279\u5f81\u4e2d\u968f\u673a\u9009\u62e9 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>            k <\/p>\n<p>           k <\/p>\n<p>       <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0315em\">k<\/span><\/span><\/span><\/span><\/span> \u4e2a&#xff08;\u901a\u5e38 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>            k <\/p>\n<p>            &#061; <\/p>\n<p>             m <\/p>\n<p>           k &#061; \\\\sqrt{m} <\/p>\n<p>       <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0315em\">k<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1.04em;vertical-align: -0.2397em\"><\/span><span class=\"mord sqrt\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8003em\"><span class=\"svg-align\" style=\"top: -3em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\" style=\"padding-left: 0.833em\"><span class=\"mord mathnormal\">m<\/span><\/span><\/span><span class=\"\" style=\"top: -2.7603em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"hide-tail\" style=\"min-width: 0.853em;height: 1.08em\"> <\/p>\n<p>              <\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.2397em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u6216 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>              log <\/p>\n<p>              \u2061 <\/p>\n<p>             2 <\/p>\n<p>            ( <\/p>\n<p>            m <\/p>\n<p>            ) <\/p>\n<p>           \\\\log_2(m) <\/p>\n<p>       <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mop\"><span class=\"mop\">lo<span style=\"margin-right: 0.0139em\">g<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.207em\"><span class=\"\" style=\"top: -2.4559em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.2441em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">m<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff09;\u3002<\/li>\n<li>\u9009\u62e9\u6700\u4f73\u5206\u88c2\u7279\u5f81\u548c\u9608\u503c&#xff08;\u57fa\u4e8e\u57fa\u5c3c\u4e0d\u7eaf\u5ea6\u6216\u4fe1\u606f\u589e\u76ca&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>2.3. \u805a\u5408\u9884\u6d4b&#xff1a;<\/h3>\n<ul>\n<li>\u5206\u7c7b\u4efb\u52a1&#xff1a;\u6295\u7968&#xff08;\u591a\u6570\u8868\u51b3&#xff09;\u3002<\/li>\n<li>\u56de\u5f52\u4efb\u52a1&#xff1a;\u5e73\u5747\u9884\u6d4b\u503c\u3002<\/li>\n<\/ul>\n<h2>3. \u968f\u673a\u68ee\u6797\u7684\u6784\u5efa\u8fc7\u7a0b<\/h2>\n<p>\u6784\u5efa\u4e00\u4e2a\u968f\u673a\u68ee\u6797\u7684\u8fc7\u7a0b\u901a\u5e38\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u6b65\u9aa4&#xff1a;<\/p>\n<h3>3.1. \u6570\u636e\u96c6\u7684\u968f\u673a\u62bd\u6837<\/h3>\n<p>\u9996\u5148&#xff0c;\u4ece\u8bad\u7ec3\u6570\u636e\u96c6\u4e2d\u968f\u673a\u9009\u53d6\u591a\u4e2a\u5b50\u96c6&#xff08;\u901a\u5e38\u662f\u6709\u653e\u56de\u7684\u62bd\u6837&#xff09;&#xff0c;\u6bcf\u4e2a\u5b50\u96c6\u7684\u5927\u5c0f\u4e0e\u539f\u59cb\u6570\u636e\u96c6\u76f8\u540c&#xff08;\u6216\u7a0d\u5c0f&#xff09;\u3002\u6bcf\u4e2a\u5b50\u96c6\u5c06\u7528\u4e8e\u8bad\u7ec3\u4e00\u68f5\u72ec\u7acb\u7684\u51b3\u7b56\u6811\u3002<\/p>\n<h3>3.2. \u51b3\u7b56\u6811\u7684\u8bad\u7ec3<\/h3>\n<p>\u5bf9\u4e8e\u6bcf\u4e2a\u8bad\u7ec3\u5b50\u96c6&#xff0c;\u6784\u5efa\u4e00\u68f5\u51b3\u7b56\u6811\u3002\u5728\u6bcf\u4e2a\u8282\u70b9\u7684\u5212\u5206\u65f6&#xff0c;\u968f\u673a\u9009\u62e9\u4e00\u4e2a\u7279\u5f81\u5b50\u96c6&#xff0c;\u800c\u4e0d\u662f\u4f7f\u7528\u6240\u6709\u7279\u5f81&#xff0c;\u4ece\u800c\u51cf\u5c11\u4e0d\u540c\u51b3\u7b56\u6811\u4e4b\u95f4\u7684\u76f8\u5173\u6027\u3002<\/p>\n<h3>3.3. \u6811\u7684\u751f\u957f<\/h3>\n<p>\u51b3\u7b56\u6811\u7ee7\u7eed\u751f\u957f&#xff0c;\u76f4\u5230\u6ee1\u8db3\u4e00\u5b9a\u6761\u4ef6&#xff08;\u4f8b\u5982&#xff0c;\u6811\u7684\u6df1\u5ea6\u8fbe\u5230\u9884\u8bbe\u7684\u6700\u5927\u503c&#xff0c;\u6216\u8005\u8282\u70b9\u7684\u6837\u672c\u6570\u5c0f\u4e8e\u67d0\u4e2a\u9608\u503c&#xff09;\u4e3a\u6b62\u3002\u6ce8\u610f&#xff0c;\u968f\u673a\u68ee\u6797\u901a\u5e38\u4e0d\u526a\u679d&#xff08;pruning&#xff09;\u51b3\u7b56\u6811&#xff0c;\u8fd9\u6709\u52a9\u4e8e\u51cf\u5c11\u504f\u5dee\u3002<\/p>\n<h3>3.4. \u591a\u68f5\u6811\u7684\u96c6\u6210<\/h3>\n<p>\u968f\u673a\u68ee\u6797\u901a\u8fc7\u96c6\u6210\u6240\u6709\u51b3\u7b56\u6811\u7684\u9884\u6d4b\u7ed3\u679c\u6765\u7ed9\u51fa\u6700\u7ec8\u9884\u6d4b\u3002\u5bf9\u4e8e\u5206\u7c7b\u4efb\u52a1&#xff0c;\u901a\u5e38\u91c7\u7528\u591a\u6570\u6295\u7968\u6cd5&#xff1b;\u5bf9\u4e8e\u56de\u5f52\u4efb\u52a1&#xff0c;\u901a\u5e38\u8ba1\u7b97\u5404\u6811\u8f93\u51fa\u7684\u5e73\u5747\u503c\u3002<\/p>\n<h3>3.5. \u8f93\u51fa\u9884\u6d4b\u7ed3\u679c<\/h3>\n<p>\u5206\u7c7b\u4efb\u52a1&#xff1a;\u6bcf\u68f5\u6811\u90fd\u4f1a\u7ed9\u51fa\u4e00\u4e2a\u7c7b\u522b\u6807\u7b7e&#xff0c;\u968f\u673a\u68ee\u6797\u6839\u636e\u591a\u6570\u6295\u7968\u7684\u539f\u5219\u6765\u786e\u5b9a\u6700\u7ec8\u7684\u5206\u7c7b\u7ed3\u679c\u3002 \u56de\u5f52\u4efb\u52a1&#xff1a;\u6bcf\u68f5\u6811\u7ed9\u51fa\u4e00\u4e2a\u8fde\u7eed\u7684\u6570\u503c\u9884\u6d4b&#xff0c;\u968f\u673a\u68ee\u6797\u901a\u8fc7\u8ba1\u7b97\u8fd9\u4e9b\u9884\u6d4b\u7684\u5e73\u5747\u503c\u6765\u5f97\u5230\u6700\u7ec8\u7684\u56de\u5f52\u7ed3\u679c\u3002<\/p>\n<h2>4. \u968f\u673a\u68ee\u6797\u7684\u5173\u952e\u53c2\u6570<\/h2>\n<ul>\n<li>n_estimators&#xff1a;\u68ee\u6797\u4e2d\u6811\u7684\u6570\u91cf\u3002\u901a\u5e38\u8d8a\u5927\u8d8a\u597d&#xff0c;\u4f46\u8ba1\u7b97\u6210\u672c\u589e\u52a0&#xff08;\u9ed8\u8ba4100&#xff09;\u3002<\/li>\n<li>max_depth&#xff1a;\u51b3\u7b56\u6811\u7684\u6700\u5927\u6df1\u5ea6&#xff0c;\u63a7\u5236\u6811\u7684\u590d\u6742\u5ea6\u3002\u8f83\u5c0f\u7684\u503c\u4f1a\u51cf\u5c11\u8fc7\u62df\u5408&#xff0c;\u4f46\u53ef\u80fd\u5bfc\u81f4\u6b20\u62df\u5408&#xff1b;\u8f83\u5927\u7684\u503c\u53ef\u80fd\u5bfc\u81f4\u8fc7\u62df\u5408\u3002<\/li>\n<li>max_features&#xff1a;\u6bcf\u6b21\u5206\u88c2\u65f6\u8003\u8651\u7684\u6700\u5927\u7279\u5f81\u6570\u3002\u8f83\u5c0f\u7684\u503c\u80fd\u589e\u52a0\u6a21\u578b\u7684\u968f\u673a\u6027&#xff0c;\u63d0\u9ad8\u6a21\u578b\u7684\u591a\u6837\u6027\u3002\n<ul>\n<li>\u5206\u7c7b&#xff1a;sqrt(n_features)&#xff08;\u9ed8\u8ba4&#xff09;\u3002<\/li>\n<li>\u56de\u5f52&#xff1a;n_features \/ 3\u3002<\/li>\n<\/ul>\n<\/li>\n<li>min_samples_split&#xff1a;\u4e00\u4e2a\u8282\u70b9\u5206\u88c2\u6240\u9700\u7684\u6700\u5c0f\u6837\u672c\u6570&#xff08;\u9ed8\u8ba42&#xff09;\u3002\u5982\u679c\u67d0\u4e2a\u8282\u70b9\u7684\u6837\u672c\u6570\u5c0f\u4e8e\u6b64\u503c&#xff0c;\u5219\u4e0d\u4f1a\u7ee7\u7eed\u5206\u88c2\u3002<\/li>\n<li>min_samples_leaf&#xff1a;\u53f6\u8282\u70b9\u6700\u5c11\u7684\u6837\u672c\u6570&#xff0c;\u63a7\u5236\u6811\u7684\u751f\u957f&#xff08;\u9ed8\u8ba41&#xff09;\u3002\u8f83\u5927\u7684\u503c\u6709\u52a9\u4e8e\u9632\u6b62\u8fc7\u62df\u5408\u3002<\/li>\n<li>bootstrap&#xff1a;\u662f\u5426\u91c7\u7528\u81ea\u52a9\u6cd5&#xff08;bootstrap&#xff09;\u8fdb\u884c\u6570\u636e\u91c7\u6837&#xff0c;\u9ed8\u8ba4\u662fTrue&#xff0c;\u8868\u793a\u4f7f\u7528\u6709\u653e\u56de\u7684\u62bd\u6837\u3002<\/li>\n<li>oob_score&#xff1a;\u662f\u5426\u4f7f\u7528\u888b\u5916\u6570\u636e&#xff08;Out-of-Bag data&#xff09;\u6765\u8bc4\u4f30\u6a21\u578b\u7684\u6027\u80fd&#xff0c;\u9ed8\u8ba4\u662fFalse\u3002<\/li>\n<\/ul>\n<h2>5. \u6570\u5b66\u539f\u7406<\/h2>\n<ul>\n<li>\n<p>Bagging\u7684\u65b9\u5dee\u51cf\u5c11&#xff1a; \u8bbe\u5355\u68f5\u6811\u7684\u65b9\u5dee\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>            \u03c3 <\/p>\n<p>            2 <\/p>\n<p>          \u03c3^2 <\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8141em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.0359em\">\u03c3<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>           T <\/p>\n<p>          T <\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">T<\/span><\/span><\/span><\/span><\/span>\u68f5\u6811\u7684\u5e73\u5747\u9884\u6d4b\u65b9\u5dee\u4e3a&#xff1a; <span class=\"katex--display\"><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>            Var <\/p>\n<p>             ( <\/p>\n<p>              1 <\/p>\n<p>              T <\/p>\n<p>              \u2211 <\/p>\n<p>               i <\/p>\n<p>               &#061; <\/p>\n<p>               1 <\/p>\n<p>              T <\/p>\n<p>              h <\/p>\n<p>              i <\/p>\n<p>             ( <\/p>\n<p>             x <\/p>\n<p>             ) <\/p>\n<p>             ) <\/p>\n<p>            &#061; <\/p>\n<p>              \u03c3 <\/p>\n<p>              2 <\/p>\n<p>             T <\/p>\n<p>            &#043; <\/p>\n<p>            \u03c1 <\/p>\n<p>             \u03c3 <\/p>\n<p>             2 <\/p>\n<p>             ( <\/p>\n<p>             1 <\/p>\n<p>             \u2212 <\/p>\n<p>              1 <\/p>\n<p>              T <\/p>\n<p>             ) <\/p>\n<p>           \\\\text{Var} \\\\left( \\\\frac{1}{T} \\\\sum_{i&#061;1}^{T} h_i(x) \\\\right) &#061; \\\\frac{\\\\sigma^2}{T} &#043; \\\\rho \\\\sigma^2 \\\\left( 1 &#8211; \\\\frac{1}{T} \\\\right) <\/p>\n<p>       <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 3.106em;vertical-align: -1.2777em\"><\/span><span class=\"mord text\"><span class=\"mord\">Var<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"minner\"><span class=\"mopen delimcenter\" style=\"top: 0em\"><span class=\"delimsizing size4\">(<\/span><\/span><span class=\"mord\"><span class=\"mopen nulldelimiter\"><\/span><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 1.3214em\"><span class=\"\" style=\"top: -2.314em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">T<\/span><\/span><\/span><span class=\"\" style=\"top: -3.23em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"frac-line\" style=\"border-bottom-width: 0.04em\"><\/span><\/span><span class=\"\" style=\"top: -3.677em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\">1<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.686em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><span class=\"mclose nulldelimiter\"><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mop op-limits\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 1.8283em\"><span class=\"\" style=\"top: -1.8723em;margin-left: 0em\"><span class=\"pstrut\" style=\"height: 3.05em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\">i<\/span><span class=\"mrel mtight\">&#061;<\/span><span class=\"mord mtight\">1<\/span><\/span><\/span><\/span><span class=\"\" style=\"top: -3.05em\"><span class=\"pstrut\" style=\"height: 3.05em\"><\/span><span class=\"\"><span class=\"mop op-symbol large-op\">\u2211<\/span><\/span><\/span><span class=\"\" style=\"top: -4.3em;margin-left: 0em\"><span class=\"pstrut\" style=\"height: 3.05em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\" style=\"margin-right: 0.1389em\">T<\/span><\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 1.2777em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\">h<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.3117em\"><span class=\"\" style=\"top: -2.55em;margin-left: 0em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">i<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.15em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">x<\/span><span class=\"mclose\">)<\/span><span class=\"mclose delimcenter\" style=\"top: 0em\"><span class=\"delimsizing size4\">)<\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 2.1771em;vertical-align: -0.686em\"><\/span><span class=\"mord\"><span class=\"mopen nulldelimiter\"><\/span><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 1.4911em\"><span class=\"\" style=\"top: -2.314em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">T<\/span><\/span><\/span><span class=\"\" style=\"top: -3.23em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"frac-line\" style=\"border-bottom-width: 0.04em\"><\/span><\/span><span class=\"\" style=\"top: -3.677em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.0359em\">\u03c3<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.686em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><span class=\"mclose nulldelimiter\"><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 2.4em;vertical-align: -0.95em\"><\/span><span class=\"mord mathnormal\">\u03c1<\/span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.0359em\">\u03c3<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8641em\"><span class=\"\" style=\"top: -3.113em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"minner\"><span class=\"mopen delimcenter\" style=\"top: 0em\"><span class=\"delimsizing size3\">(<\/span><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\"><span class=\"mopen nulldelimiter\"><\/span><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 1.3214em\"><span class=\"\" style=\"top: -2.314em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">T<\/span><\/span><\/span><span class=\"\" style=\"top: -3.23em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"frac-line\" style=\"border-bottom-width: 0.04em\"><\/span><\/span><span class=\"\" style=\"top: -3.677em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\">1<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.686em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><span class=\"mclose nulldelimiter\"><\/span><\/span><span class=\"mclose delimcenter\" style=\"top: 0em\"><span class=\"delimsizing size3\">)<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>           \u03c1 <\/p>\n<p>          \u03c1 <\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.625em;vertical-align: -0.1944em\"><\/span><span class=\"mord mathnormal\">\u03c1<\/span><\/span><\/span><\/span><\/span> \u4e3a\u6811\u95f4\u76f8\u5173\u7cfb\u6570&#xff0c;\u968f\u673a\u7279\u5f81\u9009\u62e9\u53ef\u964d\u4f4e <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>           \u03c1 <\/p>\n<p>          \u03c1 <\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.625em;vertical-align: -0.1944em\"><\/span><span class=\"mord mathnormal\">\u03c1<\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<\/li>\n<li>\n<p>\u6cdb\u5316\u8bef\u5dee\u4e0a\u754c&#xff1a; <span class=\"katex--display\"><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>            Error <\/p>\n<p>            \u2264 <\/p>\n<p>               \u03c1 <\/p>\n<p>               \u02c9 <\/p>\n<p>              ( <\/p>\n<p>              1 <\/p>\n<p>              \u2212 <\/p>\n<p>               s <\/p>\n<p>               2 <\/p>\n<p>              ) <\/p>\n<p>              s <\/p>\n<p>              2 <\/p>\n<p>           \\\\text{Error} \\\\leq \\\\frac{\\\\bar{\\\\rho}(1 &#8211; s^2)}{s^2} <\/p>\n<p>       <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8193em;vertical-align: -0.136em\"><\/span><span class=\"mord text\"><span class=\"mord\">Error<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 2.1771em;vertical-align: -0.686em\"><\/span><span class=\"mord\"><span class=\"mopen nulldelimiter\"><\/span><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 1.4911em\"><span class=\"\" style=\"top: -2.314em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\"><span class=\"mord mathnormal\">s<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.7401em\"><span class=\"\" style=\"top: -2.989em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"\" style=\"top: -3.23em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"frac-line\" style=\"border-bottom-width: 0.04em\"><\/span><\/span><span class=\"\" style=\"top: -3.677em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord accent\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.5678em\"><span class=\"\" style=\"top: -3em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord mathnormal\">\u03c1<\/span><\/span><span class=\"\" style=\"top: -3em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"accent-body\" style=\"left: -0.1667em\"><span class=\"mord\">\u02c9<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.1944em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><span class=\"mopen\">(<\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\">s<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.686em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><span class=\"mclose nulldelimiter\"><\/span><\/span><\/span><\/span><\/span><\/span><\/span> <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>            \u03c1 <\/p>\n<p>            \u02c9 <\/p>\n<p>          \\\\bar{\\\\rho} <\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7622em;vertical-align: -0.1944em\"><\/span><span class=\"mord accent\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.5678em\"><span class=\"\" style=\"top: -3em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord mathnormal\">\u03c1<\/span><\/span><span class=\"\" style=\"top: -3em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"accent-body\" style=\"left: -0.1667em\"><span class=\"mord\">\u02c9<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.1944em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>&#xff1a;\u6811\u95f4\u5e73\u5747\u76f8\u5173\u6027\u3002 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"> <\/p>\n<p>           s <\/p>\n<p>          s <\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">s<\/span><\/span><\/span><\/span><\/span>&#xff1a;\u5355\u68f5\u6811\u7684\u5e73\u5747\u51c6\u786e\u7387\u3002<\/p>\n<\/li>\n<\/ul>\n<h2>6. \u968f\u673a\u68ee\u6797\u7684\u4f18\u7f3a\u70b9<\/h2>\n<ul>\n<li>\n<p>\u2705 \u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u9ad8\u51c6\u786e\u6027&#xff1a;\u901a\u8fc7\u96c6\u6210\u964d\u4f4e\u8fc7\u62df\u5408\u98ce\u9669\u3002<\/p>\n<\/li>\n<li>\n<p>\u9c81\u68d2\u6027\u5f3a&#xff1a;\u5bf9\u566a\u58f0\u548c\u5f02\u5e38\u503c\u4e0d\u654f\u611f\u3002<\/p>\n<\/li>\n<li>\n<p>\u53ef\u5e76\u884c\u5316&#xff1a;\u6bcf\u68f5\u6811\u72ec\u7acb\u8bad\u7ec3\u3002<\/p>\n<\/li>\n<li>\n<p>\u7279\u5f81\u91cd\u8981\u6027\u8bc4\u4f30&#xff1a;\u57fa\u4e8e\u5206\u88c2\u65f6\u7684\u8d21\u732e\u5ea6\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u274c \u7f3a\u70b9&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u8ba1\u7b97\u6210\u672c\u9ad8&#xff1a;\u6811\u6570\u91cf\u591a\u65f6\u8bad\u7ec3\u6162\u3002<\/p>\n<\/li>\n<li>\n<p>\u89e3\u91ca\u6027\u5dee&#xff1a;\u76f8\u6bd4\u5355\u68f5\u6811\u66f4\u96be\u53ef\u89c6\u5316\u3002<\/p>\n<\/li>\n<li>\n<p>\u5bf9\u9ad8\u7ef4\u7a00\u758f\u6570\u636e&#xff08;\u5982\u6587\u672c&#xff09;\u6548\u679c\u4e00\u822c\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>7. \u7279\u5f81\u91cd\u8981\u6027\u8bc4\u4f30<\/h2>\n<ul>\n<li>\n<p>\u57fa\u4e8e\u57fa\u5c3c\u91cd\u8981\u6027&#xff08;Gini Importance&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u7edf\u8ba1\u6bcf\u4e2a\u7279\u5f81\u5728\u6240\u6709\u6811\u4e2d\u5206\u88c2\u65f6\u51cf\u5c11\u7684\u57fa\u5c3c\u4e0d\u7eaf\u5ea6\u603b\u548c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u57fa\u4e8e\u6392\u5217\u91cd\u8981\u6027&#xff08;Permutation Importance&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u6253\u4e71\u7279\u5f81\u503c\u540e\u89c2\u5bdf\u6a21\u578b\u6027\u80fd\u4e0b\u964d\u7a0b\u5ea6\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>8. \u968f\u673a\u68ee\u6797\u7684\u5e94\u7528<\/h2>\n<p>\u968f\u673a\u68ee\u6797\u5728\u8bb8\u591a\u9886\u57df\u6709\u5e7f\u6cdb\u7684\u5e94\u7528&#xff0c;\u5305\u62ec\u4f46\u4e0d\u9650\u4e8e&#xff1a;<\/p>\n<ul>\n<li>\u5206\u7c7b\u4efb\u52a1&#xff1a;\u5982\u56fe\u50cf\u8bc6\u522b\u3001\u5783\u573e\u90ae\u4ef6\u8fc7\u6ee4\u3001\u75be\u75c5\u9884\u6d4b\u3001\u4fe1\u7528\u5361\u6b3a\u8bc8\u68c0\u6d4b\u7b49\u3002<\/li>\n<li>\u56de\u5f52\u4efb\u52a1&#xff1a;\u5982\u623f\u4ef7\u9884\u6d4b\u3001\u80a1\u7968\u5e02\u573a\u5206\u6790\u7b49\u3002<\/li>\n<li>\u7279\u5f81\u9009\u62e9&#xff1a;\u901a\u8fc7\u8ba1\u7b97\u5404\u4e2a\u7279\u5f81\u7684\u91cd\u8981\u6027&#xff0c;\u5e2e\u52a9\u9009\u62e9\u6700\u5177\u4ee3\u8868\u6027\u7684\u7279\u5f81&#xff0c;\u8fdb\u884c\u540e\u7eed\u5efa\u6a21\u3002<\/li>\n<li>\u5f02\u5e38\u68c0\u6d4b&#xff1a;\u901a\u8fc7\u5224\u65ad\u67d0\u4e2a\u6837\u672c\u4e0e\u5176\u4ed6\u6837\u672c\u7684\u533a\u522b&#xff0c;\u8fdb\u884c\u5f02\u5e38\u68c0\u6d4b\u3002<\/li>\n<\/ul>\n<h2>9. \u6837\u4f8b\u4ee3\u7801<\/h2>\n<p><span class=\"token comment\"># \u5bfc\u5165\u6240\u9700\u7684\u5e93<\/span><br \/>\n<span class=\"token keyword\">from<\/span> sklearn<span class=\"token punctuation\">.<\/span>datasets <span class=\"token keyword\">import<\/span> load_iris<br \/>\n<span class=\"token keyword\">from<\/span> sklearn<span class=\"token punctuation\">.<\/span>model_selection <span class=\"token keyword\">import<\/span> train_test_split<br \/>\n<span class=\"token keyword\">from<\/span> sklearn<span class=\"token punctuation\">.<\/span>ensemble <span class=\"token keyword\">import<\/span> RandomForestClassifier<br \/>\n<span class=\"token keyword\">from<\/span> sklearn<span class=\"token punctuation\">.<\/span>metrics <span class=\"token keyword\">import<\/span> classification_report<span class=\"token punctuation\">,<\/span> accuracy_score<\/p>\n<p><span class=\"token comment\"># \u52a0\u8f7d\u9e22\u5c3e\u82b1\u6570\u636e\u96c6<\/span><br \/>\niris <span class=\"token operator\">&#061;<\/span> load_iris<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\nX <span class=\"token operator\">&#061;<\/span> iris<span class=\"token punctuation\">.<\/span>data  <span class=\"token comment\"># \u7279\u5f81\u6570\u636e<\/span><br \/>\ny <span class=\"token operator\">&#061;<\/span> iris<span class=\"token punctuation\">.<\/span>target  <span class=\"token comment\"># \u6807\u7b7e\u6570\u636e<\/span><\/p>\n<p><span class=\"token comment\"># \u5c06\u6570\u636e\u96c6\u5206\u4e3a\u8bad\u7ec3\u96c6\u548c\u6d4b\u8bd5\u96c6&#xff0c;80% \u7528\u4e8e\u8bad\u7ec3&#xff0c;20% \u7528\u4e8e\u6d4b\u8bd5<\/span><br \/>\nX_train<span class=\"token punctuation\">,<\/span> X_test<span class=\"token punctuation\">,<\/span> y_train<span class=\"token punctuation\">,<\/span> y_test <span class=\"token operator\">&#061;<\/span> train_test_split<span class=\"token punctuation\">(<\/span>X<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">,<\/span> test_size<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0.2<\/span><span class=\"token punctuation\">,<\/span> random_state<span class=\"token operator\">&#061;<\/span><span class=\"token number\">42<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u521d\u59cb\u5316\u968f\u673a\u68ee\u6797\u5206\u7c7b\u5668<\/span><br \/>\nrf_classifier <span class=\"token operator\">&#061;<\/span> RandomForestClassifier<span class=\"token punctuation\">(<\/span>n_estimators<span class=\"token operator\">&#061;<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">,<\/span> random_state<span class=\"token operator\">&#061;<\/span><span class=\"token number\">42<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u8bad\u7ec3\u6a21\u578b<\/span><br \/>\nrf_classifier<span class=\"token punctuation\">.<\/span>fit<span class=\"token punctuation\">(<\/span>X_train<span class=\"token punctuation\">,<\/span> y_train<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u5728\u6d4b\u8bd5\u96c6\u4e0a\u8fdb\u884c\u9884\u6d4b<\/span><br \/>\ny_pred <span class=\"token operator\">&#061;<\/span> rf_classifier<span class=\"token punctuation\">.<\/span>predict<span class=\"token punctuation\">(<\/span>X_test<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u8f93\u51fa\u5206\u7c7b\u62a5\u544a\u548c\u51c6\u786e\u7387<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Accuracy:&#034;<\/span><span class=\"token punctuation\">,<\/span> accuracy_score<span class=\"token punctuation\">(<\/span>y_test<span class=\"token punctuation\">,<\/span> y_pred<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;\\\\nClassification Report:\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> classification_report<span class=\"token punctuation\">(<\/span>y_test<span class=\"token punctuation\">,<\/span> y_pred<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u8f93\u51fa\u7279\u5f81\u91cd\u8981\u6027<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\nFeature Importance:&#034;<\/span><span class=\"token punctuation\">,<\/span> rf_classifier<span class=\"token punctuation\">.<\/span>feature_importances_<span class=\"token punctuation\">)<\/span><\/p>\n<h2>10. \u5982\u4f55\u63d0\u5347\u968f\u673a\u68ee\u6797\u7684\u6027\u80fd<\/h2>\n<p>\u5c3d\u7ba1\u968f\u673a\u68ee\u6797\u5df2\u7ecf\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u673a\u5668\u5b66\u4e60\u7b97\u6cd5&#xff0c;\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b&#xff0c;\u4ecd\u7136\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\u6765\u63d0\u5347\u5176\u6027\u80fd&#xff1a;<\/p>\n<ul>\n<li>\u589e\u52a0\u6811\u7684\u6570\u91cf&#xff08;n_estimators&#xff09;&#xff1a;\u589e\u52a0\u6811\u7684\u6570\u91cf\u53ef\u4ee5\u63d0\u9ad8\u6a21\u578b\u7684\u51c6\u786e\u6027&#xff0c;\u4f46\u4e5f\u4f1a\u589e\u52a0\u8ba1\u7b97\u7684\u5f00\u9500\u3002\u901a\u5e38&#xff0c;\u6811\u7684\u6570\u91cf\u8fbe\u5230\u4e00\u5b9a\u6c34\u5e73\u540e&#xff0c;\u6027\u80fd\u63d0\u5347\u4f1a\u8d8b\u4e8e\u5e73\u7a33\u3002<\/li>\n<li>\u8c03\u6574\u7279\u5f81\u9009\u62e9\u7684\u6570\u91cf&#xff08;max_features&#xff09;&#xff1a;\u5c1d\u8bd5\u8c03\u6574\u5728\u6bcf\u4e2a\u8282\u70b9\u5206\u88c2\u65f6\u4f7f\u7528\u7684\u7279\u5f81\u6570\u91cf&#xff0c;\u9009\u62e9\u5408\u9002\u7684\u503c\u53ef\u4ee5\u5e2e\u52a9\u63d0\u9ad8\u6a21\u578b\u7684\u591a\u6837\u6027\u548c\u6027\u80fd\u3002<\/li>\n<li>\u901a\u8fc7\u4ea4\u53c9\u9a8c\u8bc1\u9009\u62e9\u6700\u4f73\u8d85\u53c2\u6570&#xff1a;\u4f7f\u7528\u4ea4\u53c9\u9a8c\u8bc1&#xff08;cross-validation&#xff09;\u6765\u9009\u62e9\u6700\u4f73\u7684\u8d85\u53c2\u6570&#xff0c;\u4f8b\u5982\u6811\u7684\u6700\u5927\u6df1\u5ea6\u3001\u6700\u5c0f\u6837\u672c\u6570\u7b49\u3002<\/li>\n<li>\u4f7f\u7528\u66f4\u591a\u7684\u6837\u672c&#xff08;\u66f4\u5927\u7684\u6570\u636e\u96c6&#xff09;&#xff1a;\u5982\u679c\u6761\u4ef6\u5141\u8bb8&#xff0c;\u53ef\u4ee5\u4f7f\u7528\u66f4\u591a\u7684\u8bad\u7ec3\u6837\u672c&#xff0c;\u5e2e\u52a9\u6a21\u578b\u6355\u6349\u5230\u66f4\u4e30\u5bcc\u7684\u89c4\u5f8b\u3002<\/li>\n<\/ul>\n<h2>11. \u5c0f\u7ed3<\/h2>\n<p>\u968f\u673a\u68ee\u6797\u901a\u8fc7Bagging&#043;\u968f\u673a\u7279\u5f81\u6784\u5efa\u591a\u6837\u5316\u7684\u51b3\u7b56\u6811\u7fa4&#xff0c;\u5e73\u8861\u504f\u5dee\u4e0e\u65b9\u5dee&#xff0c;\u9002\u7528\u4e8e\u5927\u591a\u6570\u8868\u683c\u6570\u636e\u4efb\u52a1\u3002\u5176\u4f18\u52bf\u5728\u4e8e\u6613\u7528\u6027\u3001\u9c81\u68d2\u6027\u548c\u53ef\u89e3\u91ca\u6027&#xff08;\u901a\u8fc7\u7279\u5f81\u91cd\u8981\u6027&#xff09;\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d&#xff0c;\u9700\u6ce8\u610f&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u6811\u6570\u91cf&#xff1a;\u901a\u5e38100~500\u8db3\u591f\u3002<\/p>\n<\/li>\n<li>\n<p>\u7279\u5f81\u5b50\u96c6\u5927\u5c0f&#xff1a;\u5206\u7c7b\u7528 sqrt(n_features)&#xff0c;\u56de\u5f52\u7528 n_features\/3\u3002<\/p>\n<\/li>\n<li>\n<p>\u907f\u514d\u8fc7\u62df\u5408&#xff1a;\u63a7\u5236\u6811\u6df1\u5ea6&#xff08;max_depth&#xff09;\u548c\u53f6\u8282\u70b9\u6837\u672c\u6570&#xff08;min_samples_leaf&#xff09;\u3002<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb851\u6b21\uff0c\u70b9\u8d5e19\u6b21\uff0c\u6536\u85cf15\u6b21\u3002\u5b83\u901a\u8fc7\u6784\u5efa\u591a\u4e2a\u51b3\u7b56\u6811\uff08Decision Tree\uff09\uff0c\u5e76\u901a\u8fc7\u96c6\u6210\u5b66\u4e60\u7684\u601d\u60f3\uff0c\u6700\u7ec8\u8f93\u51fa\u591a\u4e2a\u51b3\u7b56\u6811\u7684\u7ed3\u679c\u7684\u5e73\u5747\u503c\u6216\u591a\u6570\u6295\u7968\u7ed3\u679c\uff0c\u4ece\u800c\u63d0\u9ad8\u6a21\u578b\u7684\u51c6\u786e\u6027\u548c\u7a33\u5b9a\u6027\u3002\u968f\u673a\u68ee\u6797\u7684\u6838\u5fc3\u601d\u60f3\u662f\u901a\u8fc7\u6784\u5efa\u591a\u4e2a\u51b3\u7b56\u6811\uff0c\u5e76\u7ed3\u5408\u5b83\u4eec\u7684\u7ed3\u679c\u6765\u8fdb\u884c\u9884\u6d4b\u3002\u51b3\u7b56\u6811\u7ee7\u7eed\u751f\u957f\uff0c\u76f4\u5230\u6ee1\u8db3\u4e00\u5b9a\u6761\u4ef6\uff08\u4f8b\u5982\uff0c\u6811\u7684\u6df1\u5ea6\u8fbe\u5230\u9884\u8bbe\u7684\u6700\u5927\u503c\uff0c\u6216\u8005\u8282\u70b9\u7684\u6837\u672c\u6570\u5c0f\u4e8e\u67d0\u4e2a\u9608\u503c\uff09\u4e3a\u6b62\u3002\u968f\u673a\u9009\u62e9\u7279\u5f81\uff1a\u5728\u6bcf\u4e2a\u51b3\u7b56\u6811\u7684\u6bcf\u4e2a\u8282\u70b9\uff0c\u9009\u62e9\u4e00\u4e2a\u968f\u673a\u7684\u7279\u5f81\u5b50\u96c6\u6765\u8fdb\u884c\u5206\u88c2\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u6240\u6709\u7279\u5f81\u3002\u5728\u6bcf\u4e2a\u8282\u70b9\u7684\u5212\u5206\u65f6\uff0c\u968f\u673a\u9009\u62e9\u4e00\u4e2a\u7279\u5f81\u5b50\u96c6\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u6240\u6709\u7279\u5f81\uff0c\u4ece\u800c\u51cf\u5c11\u4e0d\u540c\u51b3\u7b56\u6811\u4e4b\u95f4\u7684\u76f8\u5173\u6027\u3002<\/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":[50,207,2887],"topic":[],"class_list":["post-34200","post","type-post","status-publish","format-standard","hentry","category-server","tag-50","tag-207","tag-2887"],"yoast_head":"<!-- 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