October 2018
Intermediate to advanced
172 pages
4h 6m
English
Content preview from Machine Learning with scikit-learn Quick Start Guide
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The k-NN algorithm
Mathematically speaking, the k-NN algorithm is one of the most simple machine learning algorithms out there. See the following diagram for a visual overview of how it works:
How k-NN works under the hood
The stars in the preceding diagram represent new data points. If we built a k-NN algorithm with three neighbors, then the stars would search for the three data points that are closest to it.
In the lower-left case, the star sees two triangles and one circle. Therefore, the algorithm would classify the star as a triangle since the number of triangles was greater than the number of circles.
In the upper-right case, the ...
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