{"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":207,"pdf_page":223,"physical_index":223,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"f1d11346d92c4f950ae1473b623d274d0a1322fdac28853b7a76186e14e42cc7"},"chapter":"第7章","content":"将标签数据分离作为y，其余作为特征集X（同时，这里将原先的dataframe数据格式转换为仅保留数据的矩阵形式，以方便计算处理）：\n\n我们来观察特征X的情况。根据下面几个shells可以看出：\n\n●像素点数值绝大多数为0，这是因为一张图片除了中间区域之外都是空白。\n\n● 数值最小为0，最大为255。\n\ny的前几个观测值数据如下，分别代表数字1、0、1、4、0。\n\n现在我们将X展开成28×28的形式。此时，可以观察每个观测值的样子，通过图片的形式呈现。Matplotlib提供了将像素点数值转换成图片的接口：imshow函数。\n\n第7章 深度学习\n\n207","previous_page":206,"next_page":208}