class_docstr: Replaces answers with an echo of the passage.
  
  Useful for measuring how much a model learns to simply repeat what is said.
class_docstr_tok: ["Replaces","answers","with","an","echo","of","the","passage",".","Useful","for","measuring","how","much","a","model","learns","to","simply","repeat","what","is","said","."]
code: def _setup_data(self):
      super()._setup_data()
      for i in range(len(self.entries)):
          self.entries[i]["label"] = self.entries[i]["passage"]
  
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 1 for calling the EchoTeacher obj's underlying member method code with example usage: obj._setup_data() without return types