Softmax non-linearity function
It is because it takes in a vector of real numbers and returns a probability distribution. Its definition is as follows. Let x be a vector of real numbers (positive, negative, whatever, there are no constraints).
Then the i’th component of Softmax(x) is —
It should be clear that the output is a probability distribution: each
element is non-negative and the sum over all components is 1.
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