code: def build(self):
      self.serialize()
      decision_config = config.DecisionConfig(
          operators=self.operators,
          constants=self.constants,
          num_actions_to_choose=self.num_actions_to_choose,
          reward_function=self.reward_function,
          reward_aggregator=self.reward_aggregator,
      )
  
      return config_to_json(config.DecisionConfig, decision_config)
  
file_path: ReAgent/serving/reagent/serving/config/builder.py
imports: from typing import Any, Dict
  import reagent.serving.config.config
  import reagent.serving.config.namespace
  import reagent.serving.config.operators
  from reagent.serving.config.serialize import config_to_json
label_desc: Use image node_id 7 for calling the DecisionPlanBuilder obj's underlying member method code with example usage: obj.build() and returns: config_to_json