code: def get_model_home():
      '''
      Returns a root folder path for downloading models.
      '''
      d = os.path.join(get_data_home(), 'nnp_models')
      if not os.path.isdir(d):
          os.makedirs(d)
      return f get_model_home():
      '''
      Returns a root folder path for downloading models.
      '''
      d = os.path.join(get_data_home(), 'nnp_models')
      if not os.path.isdir(d):
          os.makedirs(d)
      return d
docs: Returns a root folder path for downloading models.