What is the value of prior log-odds by default?

[garyzhubc]

What is the value of prior log-odds by default?

[pcarbo]

@garyzhubc

# A default setting is only available if the number of other hyperparameter
# settings is 1, in which case we select 20 candidate settings for 
# the prior log-odds, evenly spaced between log10(1/p) and -1.
logodds <- seq(-log10(p),-1,length.out = 20)