code: def _load_dataset_info():
      
      def load_json(path):
          raw = pkgutil.get_data('vega_datasets', path)
          return json.loads(bytes_decode(raw))
  
      info = load_json('datasets.json')
      descriptions = load_json('dataset_info.json')
      local_datasets = load_json('local_datasets.json')
  
      for name in info:
          info[name]['is_local'] = (name in local_datasets)
      for name in descriptions:
          info[name].update(descriptions[name])
  
      return info
docs: This loads dataset info from three package files:
  
      vega_datasets/datasets.json
      vega_datasets/dataset_info.json
      vega_datasets/local_datasets.json
  
      It returns a dictionary with dataset information.