code: def main(cfg) -> None:
      tokenizer = get_tokenizer(cfg.tokenizer)
  
      server = ComboRetrievalServer(
          tokenizer, cfg.service.child_services
      )
      server.run("0.0.0.0", cfg.service.port)
  
imports: from nemo.collections.nlp.modules.common.megatron.retrieval_services.combo_retrieval_server import ComboRetrievalServer
  from nemo.collections.nlp.modules.common.tokenizer_utils import get_nmt_tokenizer
  from nemo.core.config import hydra_runner
label_desc: Use image node_id 2 for calling a global function with example usage: main(cfg) without return types