{"id":598,"date":"2021-07-04T22:41:53","date_gmt":"2021-07-04T14:41:53","guid":{"rendered":"http:\/\/eotstxtab.top\/?p=598"},"modified":"2021-07-04T22:41:53","modified_gmt":"2021-07-04T14:41:53","slug":"%e5%80%9f%e5%8a%a9mnist%e5%af%b9%e4%b8%8d%e5%90%8c%e8%ae%ad%e7%bb%83%e6%96%b9%e5%bc%8f%e6%95%88%e6%9e%9c%e7%9a%84%e6%8e%a2%e7%a9%b6","status":"publish","type":"post","link":"http:\/\/43.142.23.155\/?p=598","title":{"rendered":"\u501f\u52a9MNIST\u5bf9\u4e0d\u540c\u8bad\u7ec3\u65b9\u5f0f\u6548\u679c\u7684\u63a2\u7a76"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">\u4e00\u3001\u57fa\u7840\u77e5\u8bc6\uff1a<\/p>\n\n\n\n<p>1\u3001<strong><u>MNIST<\/u><\/strong><strong><u>\u6570\u636e\u96c6<\/u><\/strong><\/p>\n\n\n\n<p>\u672c\u5b9e\u9a8c\u91c7\u7528\u7684\u6570\u636e\u96c6MNIST\u662f\u4e00\u4e2a\u624b\u5199\u6570\u5b57\u56fe\u7247\u6570\u636e\u96c6\uff0c\u5171\u5305\u542b\u56fe\u50cf\u548c\u5bf9\u5e94\u7684\u6807\u7b7e\u3002\u6570\u636e\u96c6\u4e2d\u6240\u6709\u56fe\u7247\u90fd\u662f28&#215;28\u50cf\u7d20\u5927\u5c0f\uff0c\u4e14\u6240\u6709\u7684\u56fe\u50cf\u90fd\u7ecf\u8fc7\u4e86\u9002\u5f53\u7684\u5904\u7406\u4f7f\u5f97\u6570\u5b57\u4f4d\u4e8e\u56fe\u7247\u7684\u4e2d\u5fc3\u4f4d\u7f6e\u3002MNIST\u6570\u636e\u96c6\u4f7f\u7528\u4e8c\u8fdb\u5236\u65b9\u5f0f\u5b58\u50a8\u3002\u56fe\u7247\u6570\u636e\u4e2d\u6bcf\u4e2a\u56fe\u7247\u4e3a\u4e00\u4e2a\u957f\u5ea6\u4e3a784\uff0828x28x1\uff0c\u5373\u957f\u5bbd28\u50cf\u7d20\u7684\u5355\u901a\u9053\u7070\u5ea6\u56fe\uff09\u7684\u4e00\u7ef4\u5411\u91cf\uff0c\u800c\u6807\u7b7e\u6570\u636e\u4e2d\u6bcf\u4e2a\u6807\u7b7e\u5747\u4e3a\u957f\u5ea6\u4e3a10\u7684\u4e00\u7ef4\u5411\u91cf\u3002<\/p>\n\n\n\n<p>2\u3001<strong><u>\u5206\u5c42\u91c7\u6837\u65b9\u6cd5<\/u><\/strong><\/p>\n\n\n\n<p>\u5206\u5c42\u91c7\u6837\uff08\u6216\u5206\u5c42\u62bd\u6837\uff0c\u4e5f\u53eb\u7c7b\u578b\u62bd\u6837\uff09\u65b9\u6cd5\uff0c\u662f\u5c06\u603b\u4f53\u6837\u672c\u5206\u6210\u591a\u4e2a\u7c7b\u522b\uff0c\u518d\u5206\u522b\u5728\u6bcf\u4e2a\u7c7b\u522b\u4e2d\u8fdb\u884c\u91c7\u6837\u7684\u65b9\u6cd5\u3002\u901a\u8fc7\u5212\u5206\u7c7b\u522b\uff0c\u91c7\u6837\u51fa\u7684\u6837\u672c\u7684\u7c7b\u578b\u5206\u5e03\u548c\u603b\u4f53\u6837\u672c\u76f8\u4f3c\uff0c\u5e76\u4e14\u66f4\u5177\u6709\u4ee3\u8868\u6027\u3002\u5728\u672c\u5b9e\u9a8c\u4e2d\uff0cMNIST\u6570\u636e\u96c6\u4e3a\u624b\u5199\u6570\u5b57\u96c6\uff0c\u67090~9\u517110\u79cd\u6570\u5b57\uff0c\u8fdb\u884c\u5206\u5c42\u91c7\u6837\u65f6\u5148\u5c06\u6570\u636e\u96c6\u6309\u6570\u5b57\u5206\u4e3a10\u7c7b\uff0c\u518d\u6309\u540c\u6837\u7684\u65b9\u5f0f\u5206\u522b\u8fdb\u884c\u91c7\u6837\u3002<\/p>\n\n\n\n<p>3\u3001<strong><u>\u795e\u7ecf\u7f51\u7edc\u6a21\u578b\u8bc4\u4f30\u65b9\u6cd5<\/u><\/strong><\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \u901a\u5e38\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5b9e\u9a8c\u6d4b\u8bd5\u6765\u5bf9\u795e\u7ecf\u7f51\u7edc\u6a21\u578b\u7684\u8bef\u5dee\u8fdb\u884c\u8bc4\u4f30\u3002\u4e3a\u6b64\uff0c\u9700\u8981\u4f7f\u7528\u4e00\u4e2a\u6d4b\u8bd5\u96c6\u6765\u6d4b\u8bd5\u6a21\u578b\u5bf9\u65b0\u6837\u672c\u7684\u5224\u522b\u80fd\u529b\uff0c\u7136\u540e\u4ee5\u6b64\u6d4b\u8bd5\u96c6\u4e0a\u7684\u6d4b\u8bd5\u8bef\u5dee\u4f5c\u4e3a\u8bef\u5dee\u7684\u8fd1\u4f3c\u503c\u3002\u4e24\u79cd\u5e38\u89c1\u7684\u5212\u5206\u8bad\u7ec3\u96c6\u548c\u6d4b\u8bd5\u96c6\u7684\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \u7559\u51fa\u6cd5\uff08hold-out\uff09\u76f4\u63a5\u5c06\u6570\u636e\u96c6\u6309\u6bd4\u4f8b\u5212\u5206\u4e3a\u4e24\u4e2a\u4e92\u65a5\u7684\u96c6\u5408\u3002\u5212\u5206\u65f6\u4e3a\u5c3d\u53ef\u80fd\u4fdd\u6301\u6570\u636e\u5206\u5e03\u7684\u4e00\u81f4\u6027\uff0c\u53ef\u4ee5\u91c7\u7528\u5206\u5c42\u91c7\u6837\uff08stratified sampling\uff09\u7684\u65b9\u5f0f\uff0c\u4f7f\u5f97\u8bad\u7ec3\u96c6\u548c\u6d4b\u8bd5\u96c6\u4e2d\u7684\u7c7b\u522b\u6bd4\u4f8b\u5c3d\u53ef\u80fd\u76f8\u4f3c\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6d4b\u8bd5\u96c6\u5728\u6574\u4e2a\u6570\u636e\u96c6\u4e0a\u7684\u5206\u5e03\u5982\u679c\u4e0d\u591f\u5747\u5300\u8fd8\u53ef\u80fd\u5f15\u5165\u989d\u5916\u7684\u504f\u5dee\uff0c\u6240\u4ee5\u5355\u6b21\u4f7f\u7528\u7559\u51fa\u6cd5\u5f97\u5230\u7684\u4f30\u8ba1\u7ed3\u679c\u5f80\u5f80\u4e0d\u591f\u7a33\u5b9a\u53ef\u9760\u3002\u5728\u4f7f\u7528\u7559\u51fa\u6cd5\u65f6\uff0c\u4e00\u822c\u8981\u91c7\u7528\u82e5\u5e72\u6b21\u968f\u673a\u5212\u5206\u3001\u91cd\u590d\u8fdb\u884c\u5b9e\u9a8c\u8bc4\u4f30\u540e\u53d6\u5e73\u5747\u503c\u4f5c\u4e3a\u7559\u51fa\u6cd5\u7684\u8bc4\u4f30\u7ed3\u679c\u3002<\/p>\n\n\n\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 k\u6298\u4ea4\u53c9\u9a8c\u8bc1\u6cd5\uff08k-fold cross validation\uff09\u5148\u5c06\u6570\u636e\u96c6\u5212\u5206\u4e3ak\u4e2a\u5927\u5c0f\u76f8\u4f3c\u7684\u4e92\u65a5\u5b50\u96c6\uff0c\u6bcf\u4e2a\u5b50\u96c6\u90fd\u5c3d\u53ef\u80fd\u4fdd\u6301\u6570\u636e\u5206\u5e03\u7684\u4e00\u81f4\u6027\uff0c\u5373\u4e5f\u91c7\u7528\u5206\u5c42\u91c7\u6837\uff08stratified sampling\uff09\u7684\u65b9\u6cd5\u3002\u7136\u540e\uff0c\u6bcf\u6b21\u7528k-1\u4e2a\u5b50\u96c6\u7684\u5e76\u96c6\u4f5c\u4e3a\u8bad\u7ec3\u96c6\uff0c\u4f59\u4e0b\u7684\u90a3\u4e2a\u5b50\u96c6\u4f5c\u4e3a\u6d4b\u8bd5\u96c6\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u83b7\u5f97k\u7ec4\u8bad\u7ec3\u96c6\u548c\u6d4b\u8bd5\u96c6\uff0c\u4ece\u800c\u53ef\u4ee5\u8fdb\u884ck\u6b21\u8bad\u7ec3\u548c\u6d4b\u8bd5\u3002\u6700\u7ec8\u8fd4\u56de\u7684\u662f\u8fd9k\u4e2a\u6d4b\u8bd5\u7ed3\u679c\u7684\u5747\u503c\u3002\u663e\u7136\uff0ck\u6298\u4ea4\u53c9\u9a8c\u8bc1\u6cd5\u7684\u8bc4\u4f30\u7ed3\u679c\u7684\u7a33\u5b9a\u6027\u548c\u4fdd\u771f\u6027\u5728\u5f88\u5927\u7a0b\u5ea6\u4e0a\u53d6\u51b3\u4e8ek\u7684\u53d6\u503c\u3002k\u6700\u5e38\u7528\u7684\u53d6\u503c\u662f10\uff0c\u6b64\u5916\u5e38\u7528\u7684\u53d6\u503c\u8fd8\u67095\u300120\u7b49\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size\">\u4e8c\u3001python\u5b9e\u73b0<\/p>\n\n\n\n<p><strong>1\u3001\u795e\u7ecf\u7f51\u7edc\u6a21\u578b\u6784\u5efa\u7684\u7a0b\u5e8f\u8bbe\u8ba1<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"554\" height=\"208\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-1.png\" alt=\"\" class=\"wp-image-602\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-1.png 554w, http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-1-300x113.png 300w\" sizes=\"auto, (max-width: 554px) 100vw, 554px\" \/><\/figure>\n\n\n\n<p>\u8fd9\u91cc\u6211\u4eec\u7531\u4e8e\u8981\u6ee1\u8db397%\u4ee5\u4e0a\uff0c\u56e0\u6b64\u4eba\u5de5\u795e\u7ecf\u7f51\u7edc\u7684\u5c42\u6570\u53ef\u80fd\u8981\u76f8\u5bf9\u591a\u4e00\u4e9b\uff0c\u4ec5\u4ec5\u4e00\u4e2a\u9690\u85cf\u5c42\u662f\u6ca1\u6709\u529e\u6cd5\u8fbe\u5230\u7684\uff0c\u4e3a\u6b64\u6211\u4eec\u4e3a\u4e86\u65b9\u4fbf\uff0c\u9009\u62e9\u5efa\u7acb\u4e00\u4e2a\u5168\u8fde\u63a5\u5c42\uff08FCN\uff09\u51fd\u6570\uff0c\u65b9\u4fbf\u4e4b\u540e\u8c03\u7528\u3002<\/p>\n\n\n\n<p>\u63a5\u4e0b\u6765\u8fd9\u91cc\u5f00\u59cb\u6784\u5efa\u6211\u4eec\u7684\u4eba\u5de5\u795e\u7ecf\u7f51\u7edc\u7ed3\u6784\uff1a\u9690\u85cf\u5c42\u4e3a2\u5c42\uff0c\u795e\u7ecf\u5143\u5206\u522b\u4e3a256\u548c64\uff0c\u6fc0\u6d3b\u51fd\u6570\u9009\u62e9\u7684\u662frelu\uff0c\u6211\u4eec\u7684\u635f\u5931\u51fd\u6570\u91c7\u7528\u4ea4\u53c9\u71b5\u3002<\/p>\n\n\n\n<p>\u4ea4\u53c9\u71b5\u635f\u5931\u51fd\u6570\u662f\u523b\u753b\u7684\u662f\u4e24\u4e2a\u6982\u7387\u5206\u5e03\u4e4b\u95f4\u7684\u8ddd\u79bb\uff0c\u4ea4\u53c9\u71b5\u8d8a\u5c0f\uff0c\u4e24\u4e2a\u6982\u7387\u7684\u5206\u5e03\u8d8a\u63a5\u8fd1\u3002<\/p>\n\n\n\n<p>\uff08Tips\uff1a\u5173\u4e8e\u6fc0\u6d3b\u51fd\u6570\u7684\u9009\u62e9\uff0c\u6ca1\u6709\u9009\u62e9sigmoid\u7684\u539f\u56e0\u662f\u4ed6\u7684\u5bfc\u6570\u4e0d\u80fd\u6ee1\u8db3MINIST\uff09<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"554\" height=\"593\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-2.png\" alt=\"\" class=\"wp-image-603\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-2.png 554w, http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-2-280x300.png 280w\" sizes=\"auto, (max-width: 554px) 100vw, 554px\" \/><\/figure>\n\n\n\n<p><strong>2<\/strong><strong>\u3001\u6a21\u578b\u8fed\u4ee3\u8bad\u7ec3\u7684\u7a0b\u5e8f\u8bbe\u8ba1<\/strong><\/p>\n\n\n\n<p>\u6a21\u578b\u8fed\u4ee340\u8f6e\uff0c\u6bcf\u8f6e\u5168\u90e8\u6570\u636e\u96c6\uff0c\u4f46\u662f\u6309\u6bcf\u6279\u6b2150\u4e2a\u6837\u672c\u8fdb\u884c\u8bad\u7ec3\uff0c\u8fd9\u91cc\u8fed\u4ee3\u8bad\u7ec3\u91c7\u7528\u4e86\u539f\u7801\u4e2dbatch_iter\u51fd\u6570\uff0c\u56e0\u6b64\u6211\u5728hold_on\u548ck_fold\u4e2d\u6240\u5206\u5272\u7684\u8bad\u7ec3\u96c6\u548c\u6d4b\u8bd5\u96c6\u9700\u8981\u6709\u4e00\u4e00\u5bf9\u5e94\u5173\u7cfb\uff0c\u6309\u7167\u6807\u7b7e\u5206\u5e03\u3002<\/p>\n\n\n\n<p><strong>3<\/strong><strong>\u3001\u4e24\u79cd\u91c7\u6837\u65b9\u5f0f\u7684\u7a0b\u5e8f\u8bbe\u8ba1<\/strong><\/p>\n\n\n\n<p>\u7531\u4e8e\u6211\u4eec\u662f\u63a2\u7a76\u4e24\u79cd\u4e0d\u540c\u91c7\u6837\u65b9\u5f0f\u5bf9\u51c6\u786e\u7387\u7684\u5f71\u54cd\uff0c\u56e0\u6b64\u5176\u5b9e\u8fd9\u4e00\u90e8\u5206\u7684\u5b9e\u73b0\u8fc7\u7a0b\u65e0\u8bba\u662f\u81ea\u5df1\u9020\u8f6e\u5b50\u8fd8\u662f\u91c7\u7528\u73b0\u6709\u7684\u5e93\u90fd\u65e0\u6240\u8c13\u3002\u4f17\u6240\u5468\u77e5python\u7684sklearn\u5e93\u91cc\u6709\u5f88\u591a\u559c\u95fb\u4e50\u89c1\u7684\u5de5\u5177\uff0c\u5176\u4e2d\u81ea\u7136\u5305\u62ec\u8fd9\u4e24\u79cd\u91c7\u6837\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<p>HoldOn\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"554\" height=\"106\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-3.png\" alt=\"\" class=\"wp-image-604\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-3.png 554w, http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-3-300x57.png 300w\" sizes=\"auto, (max-width: 554px) 100vw, 554px\" \/><\/figure>\n\n\n\n<p>Tips:<\/p>\n\n\n\n<p>random_state=1\u53ef\u786e\u4fdd\u6bcf\u6b21\u5f97\u5230\u76f8\u540c\u7684\u5206\u5272\uff0c\u4ee5\u4fbf\u518d\u73b0\u7ed3\u679c&nbsp;<\/p>\n\n\n\n<p>stratify=y\uff0c\u5219\u8868\u793a\u8fdb\u884c\u5206\u5c42\u62bd\u6837<\/p>\n\n\n\n<p>K-Fold:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"357\" height=\"122\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-4.png\" alt=\"\" class=\"wp-image-605\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-4.png 357w, http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-4-300x103.png 300w\" sizes=\"auto, (max-width: 357px) 100vw, 357px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>\u5b9e\u9a8c\u7ed3\u679c\u5c55\u793a<\/strong><strong><\/strong><\/li><\/ul>\n\n\n\n<p><strong>1<\/strong><strong>\u3001\u6a21\u578b\u5728\u9a8c\u8bc1\u96c6\u4e0b\u7684\u51c6\u786e\u7387<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"231\" height=\"410\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-5.png\" alt=\"\" class=\"wp-image-606\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-5.png 231w, http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-5-169x300.png 169w\" sizes=\"auto, (max-width: 231px) 100vw, 231px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"227\" height=\"390\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-6.png\" alt=\"\" class=\"wp-image-607\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-6.png 227w, http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-6-175x300.png 175w\" sizes=\"auto, (max-width: 227px) 100vw, 227px\" 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src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-7.png\" alt=\"\" class=\"wp-image-608\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"227\" height=\"412\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-8.png\" alt=\"\" class=\"wp-image-609\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-8.png 227w, http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-8-165x300.png 165w\" sizes=\"auto, (max-width: 227px) 100vw, 227px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"231\" height=\"283\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-9.png\" alt=\"\" class=\"wp-image-610\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"240\" height=\"412\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-10.png\" alt=\"\" class=\"wp-image-611\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-10.png 240w, http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-10-175x300.png 175w\" sizes=\"auto, (max-width: 240px) 100vw, 240px\" 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http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-11-300x60.png 300w\" sizes=\"auto, (max-width: 554px) 100vw, 554px\" 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class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"195\" height=\"326\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-12.png\" alt=\"\" class=\"wp-image-613\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-12.png 195w, http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-12-179x300.png 179w\" sizes=\"auto, (max-width: 195px) 100vw, 195px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"178\" height=\"322\" src=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-13.png\" alt=\"\" class=\"wp-image-614\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-13.png 178w, http:\/\/43.142.23.155\/wp-content\/uploads\/2021\/07\/image-13-166x300.png 166w\" sizes=\"auto, (max-width: 178px) 100vw, 178px\" 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