If we require that sum of probabilities of all the classes should be equal to 1 then we use softmax but if we require separate and individual probabilities, such as in the case of multi-label classification we use sigmoid
https://www.depends-on-the-definition.com/classifying-genres-of-movies-by-looking-at-the-poster-a-neural-approach/
https://www.depends-on-the-definition.com/classifying-genres-of-movies-by-looking-at-the-poster-a-neural-approach/
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