Mathing Learning in action 书中第二章源代码，用Python实现KNN算法，，并用Matplotlib创建散点图，构件分类器及完整的可用系统。1.收集数据：提供文件文本2.准备数据：使用Python解析文本文件3.分析数据：用Matplotlib画二维扩散图4.训练算法：5.测试算法：6.使用算法构建分类器，并完成可用系统
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