K最近邻算法-k-nearest neighbors algorithm

K最近邻算法(k-nearest neighbors algorithm)

WIKI

In pattern recognition, the k-nearest neighbors algorithm (k-NN) is a non-parametric method used for classification and regression.[1] In both cases, the input consists of the k closest training examples in the feature space. The output depends on whether k-NN is used for classification or regression:

• In k-NN classification, the output is a class membership. An object is classified by a majority vote of its neighbors, with the object being assigned to the class most common among its k nearest neighbors (k is a positive integer, typically small). If k = 1, then the object is simply assigned to the class of that single nearest neighbor.

• In k-NN regression, the output is the property value for the object. This value is the average of the values of its k nearest neighbors.