class_docstr: Flickr default teacher that expects open-ended descriptions of images.
code: def _setup_data(self, data_path):
      print("loading: " + data_path)
      with PathManager.open(data_path) as data_file:
          raw_data = json.load(data_file)["images"]
          if "train" in self.datatype:
              self.data = [d for d in raw_data if d["split"] == "train"]
          elif "valid" in self.datatype:
              self.data = [d for d in raw_data if d["split"] == "val"]
              self.cands = [
                  l
                  for d in self.data
                  for l in [s["raw"] for s in d["sentences"]]
              ]
          else:
              self.data = [d for d in raw_data if d["split"] == "test"]
              self.cands = [
                  l
                  for d in self.data
                  for l in [s["raw"] for s in d["sentences"]]
              ]
  
imports: from typing import Optional
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  from parlai.core.teachers import FixedDialogTeacher
  from parlai.core.image_featurizers import ImageLoader
  from parlai.utils.io import PathManager
  from .build import build
  import os
  import json
  import random
label_desc: Use image node_id 10 for calling the DefaultTeacher obj's underlying member method code with example usage: obj._setup_data(data_path) without return types