I do not think it is especially useful to have them. The user better has to be aware of what is does since this function is not meant to be called outside the module anyway. We could have it private (if someone were to use a function that computes a F-score, scipy is better since the f_score function above has to be used in the particular case where the data have been (ortho)normalized, and to take account optional covars).
I will add this in the documentation.