class_docstr: Base class for discrete actor net builder.
code: def build_actor(
      self,
      state_normalization_data: NormalizationData,
      num_actions: int,
  ) -> ModelBase:
      pass
  
file_path: ReAgent/reagent/net_builder/discrete_actor_net_builder.py
imports: import abc
  from typing import List
  import reagent.core.types
  import torch
  from reagent.core.fb_checker import IS_FB_ENVIRONMENT
  from reagent.core.parameters import NormalizationData
  from reagent.models.base import ModelBase
  from reagent.prediction.predictor_wrapper import ActorWithPreprocessor
  from reagent.preprocessing.preprocessor import Preprocessor
label_desc: Use image node_id 1 for calling the DiscreteActorNetBuilder obj's underlying member method code with example usage: obj.build_actor(state_normalization_data, num_actions) without return types