code: def on_forward_start(self, inputs):
      return inputs
  
file_path: BigDL/python/nano/src/bigdl/nano/utils/common/model.py
imports: from abc import ABC
  import yaml
  from pathlib import Path
  from bigdl.nano.utils.common import invalidInputError
label_desc: Use image node_id 2 for calling the AcceleratedModel obj's underlying member method code with example usage: obj.on_forward_start(inputs) and returns: inputs