code: def test_bmp(h, f):
      if h.startswith(b"BM"):
          return "bmp"
  
file_path: catboost/contrib/tools/python3/src/Lib/imghdr.py
imports: from os import PathLike
  import warnings
label_desc: Use image node_id 12 for calling a global function with example usage: test_bmp(h, f) and returns: str