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Have you ever heard the phrase, "Tell me who your friends are, and I'll tell you who you are?" That’s actually the perfect way to understand one of the most popular tools in machine learning. It’s called K-Nearest Neighbors, or KNN for short. And it is incredibly simple. Imagine you are sorting a…

Have you ever heard the phrase, "Tell me who your friends are, and I'll tell you who you are?" That’s actually the perfect way to understand one of the most popular tools in machine learning. It’s called K-Nearest Neighbors, or KNN for short. And it is incredibly simple. Imagine you are sorting a bunch of fruit—specifically, apples and pears. You score each piece of fruit based on two things: how sweet it is, and how crunchy it is. Naturally, if you look at the numbers, all the a