class_docstr: Combination of multiple reward.
code: def __init__(self, rewards: Dict[str, Tuple[Reward, float]]) -> None:
      self.rewards = rewards
  
file_path: qlib/qlib/rl/reward.py
imports: from __future__ import annotations
  from typing import TYPE_CHECKING, Any, Dict, Generic, Optional, Tuple, TypeVar
  from qlib.typehint import final
label_desc: Use image node_id 1 to create a new RewardCombination object from inherited base classes: Reward with example: obj = RewardCombination(rewards)