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      1 # Similarity Feature
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      3 ML 4
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      5 **Definition:** A similarity feature is an added feature that describes how similar some feature is to a particular landmark. This value generally ranges from 1 being the same to nearly or exactly 0 (depending on RBF used) being entirely different.
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      7 With housing data, as an example, we may use an RBF to add another feature based on lat and long to see how far away points are from some landmark city.