class_docstr: Utility class for iterating through a single episode.
  
  Used in the context of the Conversations class.
class_docstr_tok: ["Utility","class","for","iterating","through","a","single","episode",".","Used","in","the","context","of","the","Conversations","class","."]
code: def __init__(self, episode):
      self.episode = episode
      self.context = episode.get("context")
      self.metadata_path = episode.get("metadata_path")
      self.turns = self._build_turns(episode)
  
imports: import datetime
  import json
  import os
  import itertools
  from parlai.utils.io import PathManager
  from parlai.core.metrics import dict_report
  from parlai.utils.misc import AttrDict
  import parlai.utils.logging
label_desc: Use image node_id 1 to create a new Conversation object  with example: obj = Conversation(episode)