code: def register_metric(key: str, module: Any = None):
      r"""Register a metric function in GraphGym."""
      return register_base(metric_dict, key, module)
  
imports: import warnings
  from typing import Any, Callable, Dict, Union
label_desc: Use image node_id 17 for calling a global function with example usage: register_metric(key, module) and returns: register_base