code: public LinearClassifier<L, F> trainClassifier(Collection<Datum<L, F>> examples) {
      Dataset<L, F> dataset = new Dataset<L, F>();
      dataset.addAll(examples);
      return trainClassifier(dataset);
    }
docs: Takes a {@link Collection} of {@link Datum} objects and gives you back a
  {@link Classifier} trained on it.
  
  @param examples {@link Collection} of {@link Datum} objects to train the
  classifier on
  @return A {@link Classifier} trained on it.