docstr: The prefix token.
docstr_tok: ["The","prefix","token","."]
code: def prefix_token(self) -> str:
      """The prefix token."""
      return self._prefix_token
  
file_path: H2O/h2o_hf/helm/src/helm/benchmark/window_services/huggingface_window_service.py
imports: from helm.proxy.clients.huggingface_tokenizer import HuggingFaceTokenizers
  from .local_window_service import LocalWindowService
  from .tokenizer_service import TokenizerService
  from helm.proxy.clients.huggingface_client import HuggingFaceModelConfig
label_desc: Use image node_id 6 for calling the HuggingFaceWindowService obj's underlying member method code with example usage: obj.prefix_token() and returns: self