code: def save_model(
      path: Union[str, os.PathLike], model: nn.Module
  ) -> None:
      """
      Saves a model and its optimizer.
  
      Parameters
      ----------
      path
          Path to the saving location.
      model
          Model to be saved.
      """
      torch.save(model, path)
  
imports: import os
  import random
  from typing import List, Dict, Callable, Union, Optional, TYPE_CHECKING
  import numpy
  import torch
  import torch.nn
  import torch.nn.functional
  from torch.utils.data import DataLoader, Dataset
  from alibi.explainers.backends.cfrl_base import CounterfactualRLDataset
  from alibi.models.pytorch.actor_critic import Actor, Critic
label_desc: Use image node_id 15 for calling a global function with example usage: save_model(path, model) without return types