code: def pil_loader_bw(path):
      """Convenience loader for B/W files (e.g. `.png with only one color chanel`)"""
      with open(path, "rb", 0) as f:
          return Image.open(f).convert("L")
  
imports: import fnmatch
  import os
  import os.path
  import random
  import warnings
  import numpy
  import tqdm
label_desc: Use image node_id 3 for calling a global function with example usage: pil_loader_bw(path) and returns: Image