code: def _image_loader(path):
      """
      Loads the appropriate image from the image_id and returns PIL Image format.
      """
      return Image.open(path).convert("RGB")
  
file_path: ParlAI/parlai/tasks/visdial/agents.py
imports: from parlai.core.teachers import DialogTeacher
  from .build import build
  from parlai.utils.io import PathManager
  from parlai.tasks.coco_caption.build_2014 import buildImage
  from PIL import Image
  import json
  import os
label_desc: Use image node_id 2 for calling a global function with example usage: _image_loader(path) and returns: Image