code: def initialize_data_and_label_getter(self):
      if self.data_and_label_getter is None:
          self.data_and_label_getter = c_f.return_input
  
imports: import torch
  import tqdm
  from ..utils import common_functions
  from ..utils import loss_tracker
  from ..utils.key_checker import KeyChecker, KeyCheckerDict
label_desc: Use image node_id 26 for calling the BaseTrainer obj's underlying member method code with example usage: obj.initialize_data_and_label_getter() without return types