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

def get_statuses(self, batch_ids):
        """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
        """
        with self._lock:
            return {b: self.get_status(b) for b in batch_ids}