docs: def do_map(input_dict, feature_format, positive_class=None):
      '''
      Maps a new example to a set of features.
      '''
      # Context of the unseen example(s)
      train_context = input_dict['train_ctx']
      test_context = input_dict['test_ctx']
  
      # Currently known examples & background knowledge
      features = input_dict['features']
      format = input_dict['output_format']
  
      evaluations = domain_map(features, feature_format, train_context,
                               test_context, format=format,
                               positive_class=positive_class)
      return {'evaluations': evaluations}