code: def ravel_f(arr):
      if isinstance(arr, np.ndarray):
          return arr.ravel("F")
      else:
          return to_numpy(arr).ravel("F")
  
file_path: pgmpy/pgmpy/utils/compat_fns.py
imports: from copy import deepcopy
  import numpy
  import torch
label_desc: Use image node_id 9 for calling a global function with example usage: ravel_f(arr) and returns: arr, to_numpy