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k最近邻与线性分类器

最近邻算法:找到距离最短对象。

距离计算方法:曼哈顿距离算法也叫做L1距离算法、欧式距离也叫做L2距离算法

曼哈顿距离算法:用测试样本和训练样本逐元素相比较,所有元素点差的绝对值求和,即得到相似性。
值得指出的是:最近邻算法无论训练样本有多大,对于一个单独的样本来说,测试量不变。

欧式距离:计算这些图像间差值的平方和,这个距离的设置被称为 “超参数”

KNN(最邻近分类器):通过调整超参数来提高精度,一般不用于高维度。

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