code: def dataset_metadata(dataset_name):
      """
      Information about the dataset
  
      This returns a dictionary containing a 'description',
      a list of the dataset headers and optionally information
      about the dataset source.
  
      :Examples:
  
      >>> dataset_metadata("earthquakes")
      {'description': 'Taxi pickup location data in San Francisco',
       'headers': ['latitude', 'longitude']}
      """
      metadata = METADATA[dataset_name].copy()
      del metadata["url"]
      return metadata
  
imports: import csv
  import codecs
  from six.moves.urllib.request import urlopen
label_desc: Use image node_id 3 for calling a global function with example usage: dataset_metadata(dataset_name) and returns: metadata