Generic type annotation in F#

Question

I got the following error:

Error 2 Value restriction. The value \'gbmLikelihood\' has been inferred to have generic type val gbm

Answer 1

Instead of making the parameters of gbmLikelihood explicit you might also just add a generic type annotation to the function:

let gbmLikelihood<'a> = 
    likelihood (fun data p -> Array.get p 0) (fun datac p -> Array.get p 1)