code: def action_names(self):
      return self.trainer_param.actions
  
file_path: ReAgent/reagent/model_managers/discrete/discrete_c51dqn.py
imports: import logging
  from typing import Dict, Optional
  import torch
  from reagent.core.dataclasses import dataclass, field
  from reagent.core.parameters import NormalizationData, NormalizationKey, param_hash
  from reagent.model_managers.discrete_dqn_base import DiscreteDQNBase
  from reagent.net_builder.categorical_dqn.categorical import Categorical
  from reagent.net_builder.unions import CategoricalDQNNetBuilder__Union
  from reagent.training import C51Trainer, C51TrainerParameters, ReAgentLightningModule
  from reagent.workflow.types import RewardOptions
label_desc: Use image node_id 2 for calling the DiscreteC51DQN obj's underlying member method code with example usage: obj.action_names() and returns: self