code: def get_statuses(self, batch_ids):
          
          with self._lock:
              return {b: self.get_status(b) for b in batch_ids}
docs: Returns a statuses dict for the requested batches.
  
          Args:
              batch_ids (list of str): The ids of the batches to get statuses for
  
          Returns:
              dict: A dict with keys of batch ids, and values of status enums