Merge pull request #1 from GreedyAIAcademy/master

update fork

Author: xyssz1234

2.KNN/KNN.ipynb

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+KNN部分的内容主要包括：
+- KNN算法的核心思想
+- 特征工程
+- 欧式距离的计算
+- K的选择，决策边界
+- 交叉验证
+
+延伸阅读推荐：
+
+- KD-tree: https://www.cs.cmu.edu/~ckingsf/bioinfo-lectures/kdtrees.pdf
+- Large Margin Nearest Neighbor: http://jmlr.org/papers/volume10/weinberger09a/weinberger09a.pdf
+- Latent Semantic Hashing: [Book]Mining of Massive Dataset. Chapter 3.  Leskovec-Rajaraman-Ullman

2.KNN/KNN.pdf

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+Brand,Type,Color,Construction Year,Odometer,Ask Price,Days Until MOT,HP
+Peugeot 106,1.0,blue,2002,166879,999,138,60
+Peugeot 106,1.0,blue,1998,234484,999,346,60
+Peugeot 106,1.1,black,1997,219752,500,-5,60
+Peugeot 106,1.1,red,2001,223692,750,-87,60
+Peugeot 106,1.1,grey,2002,120275,1650,356,59
+Peugeot 106,1.1,red,2003,131358,1399,266,60
+Peugeot 106,1.1,green,1999,304277,799,173,57
+Peugeot 106,1.4,green,1998,93685,1300,0,75
+Peugeot 106,1.1,white,2002,225935,950,113,60
+Peugeot 106,1.4,green,1997,252319,650,133,75
+Peugeot 106,1.0,black,1998,220000,700,82,50
+Peugeot 106,1.1,black,1997,212000,700,75,60
+Peugeot 106,1.1,black,2003,255134,799,197,60