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$ \textbf{Precision} = \frac{\text{tp}}{\text{tp}+\textbf{fp}}$ : use it when fp (false positive) are important (i.e. you DONT want them, or as few as possible). Suppose you want to build a model that identify hot dogs (P) from dogs (N). Here you dont want False Positive, because a false positive here would mean a dog (Negative) served for lunch as an hot ...


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