CODEWITHSUNDEEP
functionhyperlinkregressionactivation
Srinivasan Krishnasamy
Srinivasan Krishnasamy

Reputation: 51

'Link function' and 'Activation function'

Is 'Link function' and 'Activation function' are referring same concept? Is it right that, It just converts mean output value, to the value of desired distribution(Anything other than Normal distribution)?

Upvotes: 5

Views: 1239

Answers (2)

Nicus 91
Nicus 91

Reputation: 61

Yes, they are related.

  • The activation function takes a linear combination of the inputs and returns a value, which is generally used to classify the input x.

m(x) = f(w'x + w_0)

  • The link function is the inverse of the activation function. It links the linear combination of the inputs to the mean of the model.

f^-1(m(x)) = w'x + w_0

Upvotes: 6

Jose G
Jose G

Reputation: 343

Yes, link and activation functions are referring to the same concept.

However, I am not sure if I agree with your definition.

For example, consider f to be a link function. Two common activations are a linear link, or a logistic link:

f(x) = x 
f(x) = exp(x) / (1+exp(x))

Upvotes: 0

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