docs: def download_dataset(self, dataset_name, local_path, how="stream"):
          """ It downloads from the repository the specified dataset and puts it
          in the specified local folder
  
          :param dataset_name: the name the dataset has in the repository
          :param local_path: where you want to save the dataset
          :param how: 'zip' downloads the whole dataset as a zip file and decompress it; 'stream'
                 downloads the dataset sample by sample
          :return: None
          """
          if not os.path.isdir(local_path):
              os.makedirs(local_path)
          else:
              raise ValueError("Path {} already exists!".format(local_path))
  
          local_path = os.path.join(local_path, FILES_FOLDER)
          os.makedirs(local_path)
  
          if how == 'zip':
              return self.download_as_zip(dataset_name, local_path)
          elif how == 'stream':
              return self.download_as_stream(dataset_name, local_path)
          else:
              raise ValueError("how must be {'zip', 'stream'}")