code: def __call__(self):
      # Train
      if self.cfg.graph:
          self.train_graph()
      else:
          self.train_eager()
  
imports: import oneflow
  from oneflow.nn.parallel import DistributedDataParallel
  from utils.ofrecord_data_utils import OFRecordDataLoader, SyntheticDataLoader
  from utils.utils_logging import AverageMeter
  from utils.utils_callbacks import CallBackVerification, CallBackLogging, CallBackModelCheckpoint
  from backbones import get_model
  from graph import TrainGraph, EvalGraph
  from utils.losses import CrossEntropyLoss_sbp
  import logging
label_desc: Use image node_id 2 for calling the Trainer obj's underlying member method code with example usage: obj.__call__() without return types