class_docstr: Only loads examples where label has crowdworker annotations.
  
  Do NOT use directly.
class_docstr_tok: ["Only","loads","examples","where","label","has","crowdworker","annotations",".","Do","NOT","use","directly","."]
code: def _filter_out_message(self, message, message_history):
      return message.get("mturk", None) is None
  
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 1 for calling the CrowdworkersBaseTeacher obj's underlying member method code with example usage: obj._filter_out_message(message, message_history) and returns: unknown