docstr: Exception raised during logging the batch.
code: def exception(self):
      """Exception raised during logging the batch."""
      return self._exception
  
file_path: mlflow/mlflow/utils/async_logging/run_batch.py
imports: import threading
  from typing import List
  from mlflow.entities.metric import Metric
  from mlflow.entities.param import Param
  from mlflow.entities.run_tag import RunTag
label_desc: Use image node_id 2 for calling the RunBatch obj's underlying member method code with example usage: obj.exception() and returns: self