{"id":1175,"date":"2024-07-20T07:37:39","date_gmt":"2024-07-19T23:37:39","guid":{"rendered":"http:\/\/tobykskgd.life\/?p=1175"},"modified":"2024-11-14T22:30:42","modified_gmt":"2024-11-14T14:30:42","slug":"57","status":"publish","type":"post","link":"https:\/\/tobykskgd.life\/index.php\/57\/","title":{"rendered":"\u5434\u6069\u8fbe\u673a\u5668\u5b66\u4e60\u7b14\u8bb0EP7"},"content":{"rendered":"\n

\u3010\u591a\u5206\u7c7b\u95ee\u9898\u548cSigmoid\u7684\u66ff\u4ee3\u54c1\u3011\u5434\u6069\u8fbe\u673a\u5668\u5b66\u4e60\u7b14\u8bb0EP7\uff08P61-P70\uff09<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u4ece\u4eca\u5929\u5f00\u59cb\u6211\u5c06\u5b66\u4e60\u5434\u6069\u8fbe\u6559\u6388\u7684\u673a\u5668\u5b66\u4e60\u89c6\u9891\uff0c\u4e0b\u9762\u662f\u8bfe\u7a0b\u7684\u8fde\u63a51.1 \u6b22\u8fce\u6765\u5230\u673a\u5668\u5b66\u4e60!_\u54d4\u54e9\u54d4\u54e9_bilibili<\/a>\u3002\u4e00\u5171\u6709142\u4e2a\u89c6\u9891\uff0c\u4e89\u53d6\u90fd\u5b66\u4e60\u5b8c\u6210\u5427\u3002<\/p>\n\n\n\n

\n\n\n\n

Sigmoid\u7684\u66ff\u4ee3\u54c1<\/h2>\n\n\n\n

\u4e4b\u524d\u4ecb\u7ecd\u8fc7\u591a\u79cd\u6fc0\u6d3b\u51fd\u6570\uff0c\u5c06\u591a\u79cd\u6fc0\u6d3b\u51fd\u6570\u81ea\u7531\u7ec4\u5408\uff0c\u4fbf\u80fd\u5efa\u7acb\u529f\u80fd\u66f4\u5f3a\u5927\u7684\u795e\u7ecf\u7f51\u7edc\u3002<\/p>\n\n\n\n

\u8fd9\u91cc\u518d\u4ecb\u7ecd\u4e00\u4e2a\u65b0\u7684\u6fc0\u6d3b\u51fd\u6570\u2014\u2014ReLU\u3002<\/p>\n\n\n\n

ReLU\u51fd\u6570\u7684\u529f\u80fd\u57fa\u672c\u5c31\u662f\u5f53\u8f93\u5165z\u5c0f\u4e8e0\u65f6\uff0c\u8f93\u51fa0\uff1b\u5f53z\u5927\u4e8e\u7b49\u4e8e0\u65f6\u8f93\u51faz\u672c\u8eab\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u9009\u62e9\u6fc0\u6d3b\u51fd\u6570<\/h2>\n\n\n\n

\u8f93\u51fa\u5c42\u4e2d\u6fc0\u6d3b\u51fd\u6570\u7684\u9009\u62e9\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u4e0d\u540c\u7684\u95ee\u9898\u7528\u4e0d\u540c\u7684\u51fd\u6570\u3002<\/p>\n\n\n\n

\u6bd4\u5982\u5206\u7c7b\u95ee\u9898\u4e2d\u6211\u4eec\u4e00\u822c\u9009\u62e9Sigmoid\u51fd\u6570\u3002<\/p>\n\n\n\n

\u56de\u5f52\u95ee\u9898\u5f53\u4e2d\u6211\u4eec\u4e00\u822c\u9009\u62e9Linear activation function\u6216\u8005ReLU\u51fd\u6570\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u68af\u5ea6\u4e0b\u964d\u7684\u65f6\u5019\uff0cg(z)\u5e73\u5766\u65f6\uff0c\u68af\u5ea6\u4e0b\u964d\u6162\u3002<\/p>\n\n\n\n

Sigmoid\u51fd\u6570\u6709\u4e24\u5904\u5e73\u5766\uff0cReLU\u51fd\u6570\u53ea\u6709\u4e00\u5904\u5e73\u5766\u3002<\/p>\n\n\n\n

\u6240\u4ee5\u76f8\u5bf9\u6765\u8bf4\uff0cReLU\u8bad\u7ec3\u7684\u65f6\u5019\u4f1a\u5feb\u4e00\u4e9b\uff0c\u6240\u4ee5\u9690\u85cf\u5c42\u5f53\u4e2d\u4e00\u822c\u7528ReLU\u51fd\u6570\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u603b\u7684\u6765\u8bf4\uff0c\u9690\u85cf\u5c42\u4e2d\u9ed8\u8ba4\u4f7f\u7528ReLU\u4f5c\u4e3a\u6fc0\u6d3b\u51fd\u6570\u3002<\/p>\n\n\n\n

\u8f93\u51fa\u5c42\u7684\u6fc0\u6d3b\u51fd\u6570\u8981\u6839\u636e\u5b9e\u9645\u7684\u95ee\u9898\u9009\u62e9\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u4e3a\u4ec0\u4e48\u6211\u4eec\u9700\u8981\u6fc0\u6d3b\u51fd\u6570\uff1f<\/h2>\n\n\n\n

\u5982\u679c\u7528\u7ebf\u6027\u51fd\u6570\u6784\u5efa\u795e\u7ecf\u7f51\u7edc\uff0c\u4e0d\u7ba1\u53e0\u4e86\u591a\u5c11\u5c42\uff0c\u6700\u540e\u7684\u6574\u4e2a\u6a21\u578b\u90fd\u662f\u4e00\u4e2a\u7ebf\u6027\u56de\u5f52\u3002<\/p>\n\n\n\n

\u7ebf\u6027\u4ee3\u6570\u91cc\u9762\u7684\u77e5\u8bc6\uff1a\u7ebf\u6027\u51fd\u6570\u7684\u7ebf\u6027\u51fd\u6570\u8fd8\u662f\u7ebf\u6027\u51fd\u6570\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u6240\u4ee5\u4e0d\u8981\u5728\u9690\u85cf\u5c42\u4e2d\u4f7f\u7528\u7ebf\u6027\u51fd\u6570\u5f53\u6fc0\u6d3b\u51fd\u6570\uff08\u7528ReLU\uff09<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u591a\u7c7b<\/h2>\n\n\n\n

\u4e4b\u524d\u8bf4\u7684\u5206\u7c7b\u90fd\u662f\u5c06\u6570\u636e\u5206\u6210\u4e24\u7c7b\u3002<\/p>\n\n\n\n

\u591a\u7c7b\u95ee\u9898\u505a\u7684\u5c31\u662f\u5206\u7c7b\u591a\u4e2a\u7c7b\u522b\u7684\u6570\u636e\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

Softmax<\/h2>\n\n\n\n

Softmax\u5c31\u662f\u51fa\u529b\u591a\u7d2f\u95ee\u9898\u7684\u6fc0\u6d3b\u51fd\u6570\uff0c\u4e0b\u9762\u662fSoftmax\u51fd\u6570\u8ddf\u5206\u4e24\u4e2a\u7c7b\u4e4b\u95f4\u505a\u6cd5\u7684\u4e0d\u540c\u548c\u51fd\u6570\u7684\u5b9a\u4e49\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

Softmax\u7684\u635f\u5931\u51fd\u6570<\/h2>\n\n\n\n

Softmax\u7684\u635f\u5931\u51fd\u6570\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n

\u5b83\u7684\u635f\u5931\u51fd\u6570\u662f\u4e00\u4e2a\u8d1f\u5bf9\u6570\u3002<\/p>\n\n\n\n

\u5bf9\u5e94\u7684a\u8d8a\u5c0f\uff0c\u635f\u5931\u8d8a\u5927\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u795e\u7ecf\u7f51\u7edc\u7684Softmax\u8f93\u51fa<\/h2>\n\n\n\n

\u56e0\u4e3a\u8981\u5206\u591a\u4e2a\u7c7b\uff0c\u6240\u4ee5\u5c06\u8f93\u51fa\u5c42\u7684\u795e\u7ecf\u5143\u6539\u4e3a\u591a\u4e2a\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u4e0b\u9762\u662f\u591a\u5206\u7c7b\u7528TensorFlow\u5b9e\u73b0\u4ee3\u7801\uff1a<\/p>\n\n\n\n

\u91cc\u9762\u7684SparseCategoricalCrossentropy\u662f\u7528\u4e8e\u591a\u5206\u7c7b\u95ee\u9898\u7684\u4ea4\u53c9\u71b5\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n
# \u8fd9\u91cc\u7684\u635f\u5931\u51fd\u6570\u662f\u7528\u4e8e\u591a\u5206\u7c7b\u95ee\u9898\u7684\u4ea4\u53c9\u71b5\nmodel.compile(loss=SparseCategoricalCrossentropy())<\/code><\/pre>\n\n\n\n
Softmax\u7684\u6539\u8fdb\u5b9e\u73b0<\/h2>\n\n\n\n
\u56e0\u4e3a\u6570\u636e\u5b58\u50a8\u65b9\u5f0f\u7684\u5f71\u54cd\uff0c\u4ee3\u7801\u4e2d\u8ba1\u7b97\u6570\u636e\u7684\u5c0f\u6570\u4f4d\u53ef\u80fd\u4f1a\u4e22\u5931\u6216\u8005\u88ab\u56db\u820d\u4e94\u5165\u3002<\/p>\n\n\n\n
\u56e0\u6b64\u51cf\u5c11\u6b64\u5f71\u54cd\u7684\u65b9\u5f0f\u662f\u5c3d\u53ef\u80fd\u51cf\u5c11\u6216\u51cf\u53bb\u4e2d\u95f4\u53d8\u91cf\u3002<\/p>\n\n\n\n
model = Sequential(\n    [               \n        tf.keras.Input(shape=(400,)),    #specify input size\n        Dense(25, activation='relu'),  # \u7b2c\u4e00\u4e2a\u5168\u8fde\u63a5\u9690\u85cf\u5c42\uff0c25\u4e2a\u5355\u5143\uff0cReLU \u6fc0\u6d3b\n        Dense(15, activation='relu'),  # \u7b2c\u4e8c\u4e2a\u5168\u8fde\u63a5\u9690\u85cf\u5c42\uff0c15\u4e2a\u5355\u5143\uff0cReLU \u6fc0\u6d3b\n        Dense(10, activation='sigmoid') # \u8f93\u51fa\u5c42\uff0c10\u4e2a\u5355\u5143\uff0cSigmoid \u6fc0\u6d3b\n    ]\n)\n\nmodel.compile(loss=BinaryCrossEntropy(from_logits=True))<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
Softmax\u91cc\u9762\u4e5f\u662f\u5982\u6b64\uff0c\u4e0d\u4f7f\u7528\u4e2d\u95f4\u53d8\u91cfa\uff0c\u76f4\u63a5\u5199\u5176\u5c55\u5f00\u5f0f\u3002<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u591a\u4e2a\u8f93\u51fa\u7684\u5206\u7c7b<\/h2>\n\n\n\n
\u8981\u66f4\u591a\u5206\u7c7b\u533a\u5206\u7684\u662f\u591a\u7c7b\u95ee\u9898\u3002<\/p>\n\n\n\n
\u591a\u4e2a\u8f93\u51fa\u7684\u5206\u7c7b\uff0c\u591a\u7c7b\u5176\u672c\u8d28\u662f\u4e00\u4e2a\u8f93\u5165\u8f93\u51fa\u591a\u4e2a\u7c7b\u522b\u3002\uff08\u4e5f\u5c31\u662f\u4e00\u4e2a\u8f93\u5165\u4e2d\u6709\u591a\u4e2a\u7c7b\u9700\u8981\u5206\uff09<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u591a\u7c7b\u7684\u8f93\u51fa\u5411\u91cf\u7684\u6bcf\u4e2a\u5143\u7d20\u5c31\u4ee3\u8868\u4e00\u4e2a\u7c7b\u3002<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u9ad8\u7ea7\u4f18\u5316\u7b97\u6cd5<\/h2>\n\n\n\n
\u5728\u68af\u5ea6\u4e0b\u964d\u7684\u65f6\u5019\uff0c\u5982\u679cW\u6216\u8005b\u4e00\u76f4\u5728\u4e00\u4e2a\u65b9\u5411\u4e0a\u79fb\u52a8\uff0c\u6211\u4eec\u5c31\u5e0c\u671b\u589e\u5927\u5b66\u4e60\u7387\u03b1\uff1b\u5982\u679cW\u6216\u8005b\u4e00\u76f4\u6301\u7eed\u9707\u8361\uff0c\u6211\u4eec\u5e0c\u671b\u51cf\u5c0f\u5b66\u4e60\u7387\u03b1\u3002<\/p>\n\n\n\n
\u56e0\u6b64\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u53ef\u4ee5\u81ea\u52a8\u8c03\u6574\u03b1\u7684\u7b97\u6cd5\u3002<\/p>\n\n\n\n
Adam\u5c31\u662f\u8fd9\u6837\u4e00\u4e2a\u7b97\u6cd5\u3002<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
Adam\u7b97\u6cd5\u53ef\u4ee5\u901a\u8fc7\u7528\u4e0d\u540c\u7684\u03b1\u52a8\u6001\u5730\u6839\u636e\u60c5\u51b5\u6539\u53d8\u03b1\u3002<\/p>\n\n\n\n
\u6709\u5173Adam\u7b97\u6cd5\u7684\u89e3\u91ca\u8f83\u4e3a\u590d\u6742\uff0c\u8fd9\u91cc\u4e0d\u5c55\u5f00\uff0c\u4f46\u662f\u4f60\u53ef\u4ee5\u76f4\u63a5\u5728TensorFlow\u4e2d\u8c03\u7528\u5b83\u3002<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u989d\u5916\u79cd\u7c7b\u7684\u5c42<\/h2>\n\n\n\n
\u9664\u4e86\u524d\u9762\u63d0\u5230\u7684\u51e0\u79cd\u5c42\uff0c\u5377\u79ef\u5c42\u4e5f\u662f\u5e38\u7528\u7684\u4e00\u79cd\u5c42\u3002<\/p>\n\n\n\n
\u5377\u79ef\u5c42\u4e2d\u6bcf\u4e2a\u795e\u7ecf\u5143\u53ea\u770b\u8f93\u5165\u7684\u4e00\u90e8\u5206\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u5b83\u7684\u597d\u5904\u5c31\u662f\u53ef\u4ee5\u52a0\u5feb\u8ba1\u7b97\u7684\u901f\u5ea6\uff0c\u8fd8\u6709\u9700\u8981\u66f4\u5c11\u7684\u8bad\u7ec3\u6570\u636e\uff08\u66f4\u4e0d\u5bb9\u6613\u53d1\u751f\u8fc7\u62df\u5408\uff09\u3002<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5982\u4e0b\u56fe\u5377\u79ef\u5c42\u7684\u6bcf\u4e2a\u795e\u7ecf\u5143\u90fd\u53ea\u770b\u524d\u4e00\u5c42\u7684\u4e00\u90e8\u5206\u3002<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"
\u3010\u591a\u5206\u7c7b\u95ee\u9898\u548cSigmoid\u7684\u66ff\u4ee3\u54c1\u3011\u5434\u6069\u8fbe\u673a\u5668\u5b66\u4e60\u7b14\u8bb0EP7\uff08P61-P70\uff09 \u4ece\u4eca\u5929\u5f00\u59cb\u6211\u5c06\u5b66\u4e60\u5434\u6069\u8fbe\u6559\u6388 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[40],"tags":[3,7],"class_list":["post-1175","post","type-post","status-publish","format-standard","hentry","category-wedjqxxbj","tag-xxbj","tag-jjxx"],"_links":{"self":[{"href":"https:\/\/tobykskgd.life\/index.php\/wp-json\/wp\/v2\/posts\/1175","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tobykskgd.life\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tobykskgd.life\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tobykskgd.life\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tobykskgd.life\/index.php\/wp-json\/wp\/v2\/comments?post=1175"}],"version-history":[{"count":9,"href":"https:\/\/tobykskgd.life\/index.php\/wp-json\/wp\/v2\/posts\/1175\/revisions"}],"predecessor-version":[{"id":1900,"href":"https:\/\/tobykskgd.life\/index.php\/wp-json\/wp\/v2\/posts\/1175\/revisions\/1900"}],"wp:attachment":[{"href":"https:\/\/tobykskgd.life\/index.php\/wp-json\/wp\/v2\/media?parent=1175"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tobykskgd.life\/index.php\/wp-json\/wp\/v2\/categories?post=1175"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tobykskgd.life\/index.php\/wp-json\/wp\/v2\/tags?post=1175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}