class_docstr: Generic teacher which extracts each of the fields.
class_docstr_tok: ["Generic","teacher","which","extracts","each","of","the","fields","."]
code: def num_episodes(self):
      # only one example per episode
      return self.num_examples()
  
imports: from parlai.core.teachers import FbDeprecatedDialogTeacher, FixedDialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
  import copy
  import os
label_desc: Use image node_id 3 for calling the FunpediaTeacher obj's underlying member method code with example usage: obj.num_episodes() and returns: self