code: public void eval(INDArray realOutcomes, INDArray guesses) {
          eval(realOutcomes, guesses, (List<Serializable>) null);
      }
docs: Collects statistics on the real outcomes vs the
  guesses. This is for logistic outcome matrices.
  <p>
  Note that an IllegalArgumentException is thrown if the two passed in
  matrices aren't the same length.
  
  @param realOutcomes the real outcomes (labels - usually binary)
  @param guesses      the guesses/prediction (usually a probability vector)