code: def get_critic(hidden_dim: int) -> nn.Module:
      """
      Constructs the critic network.
  
      Parameters
      ----------
      hidden_dim:
          Critic's hidden dimension.
  
      Returns
      -------
      Critic network.
      """
      return Critic(hidden_dim=hidden_dim)
  
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 4 for calling a global function with example usage: get_critic(hidden_dim) and returns: Critic