code: def initialize_models(self):
      if "embedder" not in self.models:
          self.models["embedder"] = torch.nn.Identity()
  
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 33 for calling the BaseTrainer obj's underlying member method code with example usage: obj.initialize_models() without return types