{"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":225,"pdf_page":241,"physical_index":241,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"e5411b9ee289d31a10d90f9a94a96b2e2b882dfe2c0b3555d8e3ad926341aae9"},"chapter":"第8章","content":"结果如图8-18所示。\n\n上图显示的线性回归线显然有一些问题，不能很好地预测房屋中位价。下面我们尝试优化模型。\n\n8.2.5 优化模型\n\n为了方便优化，我们首先定义一个模型训练函数。通过变换函数的参数，可以看到不同的效果。下面这个代码把整个执行过程分成10个平均分割的期间（periods），这样就可以让我们看到每个期间的模型优化情况。在图上展示每个时期的误差，从而帮助我们判断是否收敛，或者需要更多迭代。比如，periods=7和steps=70，那么，每10步就会输出误差值。值得注意的是，periods不是超参数（而steps是），所以，修改periods不会影响模型训练本身。\n\n第8章 TensorFlow\n\n225","previous_page":224,"next_page":226}