class_docstr: A base class to support exporting through ONNX
docstr: Return a copy of this network to be used as target network
  
  Subclass should override this if the target network should share parameters
  with the network to be trained.
code: def get_target_network(self) -> "ModelBase":
      """
      Return a copy of this network to be used as target network
  
      Subclass should override this if the target network should share parameters
      with the network to be trained.
      """
      return deepcopy(self)
  
file_path: ReAgent/reagent/models/base.py
imports: from copy import deepcopy
  from typing import Any, Optional
  import torch.nn
  from reagent.core import types
label_desc: Use image node_id 3 for calling the ModelBase obj's underlying member method code with example usage: obj.get_target_network() and returns: deepcopy