code: def retrieve_series(cache_path, **kwargs):
      pass
  
file_path: MONAILabel/tests/unit/endpoints/test_dicomwebcache.py
imports: import json
  import os
  import unittest
  from typing import Dict
  from unittest.mock import patch
  import pydicom
  from monailabel.datastore.dicom import DICOMWebDatastore
  from monailabel.utils.others.generic import md5_digest
  from .context import DICOMWebEndpointTestSuite
label_desc: Use image node_id 2 for calling a global function with example usage: retrieve_series(cache_path) without return types