code: def _call_location(levels=2):
      """Return caller's location a number of levels up."""
      f = inspect.currentframe()
      if not f:
          return "<unknown location>"
      for _ in range(levels):
          f = f.f_back or f
      return "%s:%s" % (f.f_code.co_filename, f.f_lineno)
  
file_path: tfx/tfx/utils/deprecation_utils.py
imports: import functools
  import inspect
  import warnings
label_desc: Use image node_id 3 for calling a global function with example usage: _call_location(levels) and returns: unknown, str