class_docstr: Provide the personality in the `text` field, and the captions in the `labels` field.
  
  To specify your own path to the YFCC100m images, please use the `--yfcc-path`
  command line argument.
class_docstr_tok: ["Provide","the","personality","in","the","`","text","`","field",",","and","the","captions","in","the","`","labels","`","field",".","To","specify","your","own","path","to","the","YFCC100m","images",",","please","use","the","`","--","yfcc-path","`","command","line","argument","."]
docstr: Return number of episodes.
docstr_tok: ["Return","number","of","episodes","."]
code: def num_episodes(self):
      """
      Return number of episodes.
      """
      return self.num_examples()
  
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 json
  import os
label_desc: Use image node_id 5 for calling the PersonalityCaptionsTeacher obj's underlying member method code with example usage: obj.num_episodes() and returns: self