code: def init_from_adversarial_batches_write_to_datastore(self, submissions,
                                                         adv_batches):
      
      # prepare classification batches
      idx = 0
      for s_id in iterkeys(submissions.defenses):
        for adv_id in iterkeys(adv_batches.data):
          class_batch_id = CLASSIFICATION_BATCH_ID_PATTERN.format(idx)
          idx += 1
          self.data[class_batch_id] = {
              'adversarial_batch_id': adv_id,
              'submission_id': s_id,
              'result_path': os.path.join(
                  self._round_name,
                  CLASSIFICATION_BATCHES_SUBDIR,
                  s_id + '_' + adv_id + '.csv')
          }
      # save them to datastore
      client = self._datastore_client
      with client.no_transact_batch() as batch:
        for key, value in iteritems(self.data):
          entity = client.entity(client.key(KIND_CLASSIFICATION_BATCH, key))
          entity.update(value)
          batch.put(entity)
docs: Populates data from adversarial batches and writes to datastore.
  
      Args:
        submissions: instance of CompetitionSubmissions
        adv_batches: instance of AversarialBatches