code: def train_state(self):
      return self._train_state
  
imports: import warnings
  import psutil
  import torch
  import torch.nn
  from tqdm import tqdm
  from tez import enums
  from tez.callbacks import CallbackRunner
  from tez.utils import AverageMeter
label_desc: Use image node_id 4 for calling the Model obj's underlying member method code with example usage: obj.train_state() and returns: self