pub fn brier_term(c: &Scored<'_>) -> Result<f64, String>Expand description
One case’s Brier sum, sum_class (p - y)^2 added left to right from
zero, or why it has none. Summing these over cases does not in general
reproduce brier’s bits, which add every term to one running sum, so
spec 029 does not use it as a per-case measure yet.