code: def __repr__(self):
      return (
          f"    num merge tasks per round: {self.num_merge_tasks_per_round}\n"
          f"    num reduce tasks per merge task: {self.num_reducers_per_merger}\n"
          "    num merge tasks with extra reduce task: "
          f"{self._num_mergers_with_extra_reducer}"
      )
  
imports: import math
  from typing import Any, Callable, Dict, List, Optional, Tuple, TypeVar, Union
  import ray
  from ray.data._internal.dataset_logger import DatasetLogger
  from ray.data._internal.execution.interfaces import RefBundle, TaskContext
  from ray.data._internal.planner.exchange.interfaces import ExchangeTaskScheduler, ExchangeTaskSpec
  from ray.data._internal.progress_bar import ProgressBar
  from ray.data._internal.remote_fn import cached_remote_fn
  from ray.data._internal.stats import StatsDict
  from ray.data.block import Block, BlockAccessor, BlockExecStats, BlockMetadata
  from ray.data.context import DataContext
  from ray.types import ObjectRef
  from ray.util.scheduling_strategies import NodeAffinitySchedulingStrategy
label_desc: Use image node_id 2 for calling the _MergeTaskSchedule obj's underlying member method code with example usage: obj.__repr__() and returns: str, self, str, self, str, self