code: private Counter<L> logProbabilityOfRVFDatum(RVFDatum<L, F> example) {
      // NB: this duplicate method is needed so it calls the scoresOf method
      // with an RVFDatum signature!!  Don't remove it!
      // JLS: type resolution of method parameters is static
      Counter<L> scores = scoresOfRVFDatum(example);
      Counters.logNormalizeInPlace(scores);
      return scores;
    }
docs: Returns a counter for the log probability of each of the classes
  looking at the the sum of e^v for each count v, should be 1