docstr: Save the model file to directory.
  
  :param path: Path to saved model. Path should be a directory.
docstr_tok: ["Save","the","model","file","to","directory",".",":","param","path",":","Path","to","saved","model",".","Path","should","be","a","directory","."]
code: def _save_model(self, path, compression="fp32"):
      """
      Save the model file to directory.
  
      :param path: Path to saved model. Path should be a directory.
      """
      invalidInputError(False, "Saving function is not implemented.")
  
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 8 for calling the AcceleratedModel obj's underlying member method code with example usage: obj._save_model(path, compression) without return types