class_docstr: Do NOT use this directly, use its children.
class_docstr_tok: ["Do","NOT","use","this","directly",",","use","its","children","."]
code: def load_from_chunk(self, chunk_idx: int):
      # we load the chunk specified by chunk_idx and return a
      # list of examples
      fname = self._get_fname(chunk_idx)
      chunk_path = os.path.join(self._get_data_folder(), fname)
      output = []
      with open(chunk_path, "r") as json_file:
          json_list = list(json_file)
          for json_str in json_list:
              convo = json.loads(json_str)
              examples = self._examples(convo)
              output += examples
      return output
  
imports: import os
  import json
  from copy import deepcopy
  from parlai.core.message import Message
  from parlai.utils.data import DatatypeHelper
  from parlai.core.teachers import ChunkTeacher
  from .build import build
label_desc: Use image node_id 12 for calling the BaseBB3DataTeacher obj's underlying member method code with example usage: obj.load_from_chunk(chunk_idx) and returns: output