Two NorthPeak notes can say the same thing with different words: Oil leak under the gearbox. and A puddle of lubricant was found below the gear housing. TF-IDF gives them a similarity of 0.092, because they share only the word the. An embedding places each text at a position in a space where texts with the same meaning are close, whatever words they use. This lesson explains that space, the cosine similarity that measures closeness, and how to read the numbers it gives.
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