class_docstr: A model with the top layer removed, and with a new method `get_output_size` to retrieve the
  output channel size of the model.
  
  :param model_without_top: (nn.Module) A Model with the top layer removed.
  :param output_size: (int) Output channel size of the model.
docstr: Returns the output channel size of the model.
  
  :return: (int) output channel size of the model.
code: def get_output_size(self):
      """
      Returns the output channel size of the model.
  
      :return: (int) output channel size of the model.
      """
  
      return self.output_size
  
file_path: BigDL/python/nano/src/bigdl/nano/pytorch/vision/models/_utils.py
imports: from torch import nn
label_desc: Use image node_id 3 for calling the BackboneModule obj's underlying member method code with example usage: obj.get_output_size() and returns: self