code: def df_concat(engine: Engine):
      if engine == Engine.PANDAS:
          return pd.concat
      elif engine == Engine.CUDF:
          import cudf
  
          return cudf.concat
      raise NotImplementedError("Only pandas/cudf supported")
  
file_path: pygraphistry/graphistry/Engine.py
imports: import pandas
  from typing import Any, Optional, Union
  from enum import Enum
label_desc: Use image node_id 5 for calling a global function with example usage: df_concat(engine) and returns: pd, cudf