{"resolved":true,"match_type":"uuid","source_type":"original_book","book_id":"cd4f7678-cd9b-4971-bde0-e9ad46a6cc71","title":"人工智能与大数据技术导论","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787302517986","requested_by":"printed_page","book":{"source_type":"original_book","book_id":"cd4f7678-cd9b-4971-bde0-e9ad46a6cc71","id":"cd4f7678-cd9b-4971-bde0-e9ad46a6cc71","uuid":"cd4f7678-cd9b-4971-bde0-e9ad46a6cc71","title":"人工智能与大数据技术导论","normalized_title":"人工智能与大数据技术导论","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787302517986","isbns":["9787302517986"],"parsed":true,"ai_readable":true,"document_type":"book","page_count":490,"navigation_url":"https://workshop.closeclaw.top/ai/book/cd4f7678-cd9b-4971-bde0-e9ad46a6cc71","title_url":"https://workshop.closeclaw.top/ai/title/%E4%BA%BA%E5%B7%A5%E6%99%BA%E8%83%BD%E4%B8%8E%E5%A4%A7%E6%95%B0%E6%8D%AE%E6%8A%80%E6%9C%AF%E5%AF%BC%E8%AE%BA","fixed_page_url_template":"https://workshop.closeclaw.top/ai/book/cd4f7678-cd9b-4971-bde0-e9ad46a6cc71/page/{printed_page}","path_api_url_template":"https://workshop.closeclaw.top/api/ai/book/cd4f7678-cd9b-4971-bde0-e9ad46a6cc71/page/{printed_page}","read_url":"https://workshop.closeclaw.top/api/ai/read/cd4f7678-cd9b-4971-bde0-e9ad46a6cc71","page_url":"https://workshop.closeclaw.top/api/ai/books/cd4f7678-cd9b-4971-bde0-e9ad46a6cc71/page","search_url":"https://workshop.closeclaw.top/api/ai/books/cd4f7678-cd9b-4971-bde0-e9ad46a6cc71/search"},"page":{"printed_page":209,"pdf_page":225,"physical_index":225,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"645165d7cd7a577fde905a67c8329d6c91fae666e777aef5e511e3b3633c50ec"},"chapter":"第7章","content":"2. 构建 graph\n\n现在可以开始构建graph了。这里我们先将构建graph需要的组件以函数的形式写出来，后面组合这些组件，只需调用这些函数即可。这样可以使代码的结构清晰，以方便后期调整参数，调试模型。\n\n首先建立placeholder，用来存储输入数据X和Y，以及在优化中会用到的Dropout参数keep\\_prob。这些占位符可以在执行session时再输入具体信息，在后期有调整的余地。\n\nLeNet5模型的结构如下：\n\n在构建网络前，先初始化参数（LeNet5中的参数存在于两个conv2d层和3个全连接层，这里只需初始化W1和W2，全连接层的参数会在运算时自动被建立和初始化；另外，偏置参数b也无须初始化）：\n\n第7章 深度学习\n\n209","previous_page":208,"next_page":210}