code: def select_last(self):
      model_number = len(self.models)
      keys = list(self.models.keys())
      last_model_key = keys[model_number - 1]
  
      logger.info("Using last model {}".format(model_number))
      self.selected_model = model_number
  
      return self.models[last_model_key], last_model_key
  
file_path: small-text/small_text/integrations/pytorch/model_selection.py
imports: import logging
  from collections import OrderedDict
  from pathlib import Path
  from small_text.integrations.pytorch.exceptions import PytorchNotFoundError
  from small_text.utils.annotations import deprecated
label_desc: Use image node_id 4 for calling the PytorchModelSelection obj's underlying member method code with example usage: obj.select_last() and returns: self,  last_model_key