pub fn learn_about(
ballots: &[(String, String)],
outcome: &str,
rows: &[Trust],
beta: f64,
about: &[String],
) -> Result<Vec<Trust>>Expand description
learn writing rows scoped to about: the domains the issue’s island
speaks to, so that being wrong about one topic does not cost a voter its
standing on every other. An empty about is the unscoped rule.