code: def test_convert_starcoder(self):
      converted_model_path = llm_convert(
          model=starcoder_model_path,
          outfile=output_dir,
          model_family="starcoder",
          model_format="pth",
          outtype="int4",
      )
      assert os.path.isfile(converted_model_path)
  
file_path: BigDL/python/llm/test/convert/test_convert_model.py
imports: import pytest
  import os
  import tempfile
  from unittest import TestCase
  import shutil
  from bigdl.llm import llm_convert
  from bigdl.llm.transformers import AutoModelForCausalLM
  from bigdl.llm.optimize import optimize_model, load_low_bit, low_memory_init
label_desc: Use image node_id 4 for calling the TestConvertModel obj's underlying member method code with example usage: obj.test_convert_starcoder() without return types