code: def __init__(self, opt, shared=None):
      opt["include_last_session"] = True
      opt["nopersona_subsampling_weight"] = 0.05
      mutators = "+".join(
          ["skip_retrieval_mutator", "prompt_memory_mutator"]
      )
      if opt.get("mutators"):
          mutators = "+".join([mutators, opt["mutators"]])
      logging.warning(f"overriding mutators to {mutators}")
      opt["mutators"] = mutators
      super().__init__(opt, shared)
  
imports: from parlai.tasks.msc.agents import PersonaSummaryTeacher
  import parlai.utils.logging
  from projects.bb3.tasks.module_level_tasks import BB3TeacherMixin
label_desc: Use image node_id 1 to create a new MscMemoryGenerationTeacher object from inherited base classes: BB3TeacherMixin, PersonaSummaryTeacher with example: obj = MscMemoryGenerationTeacher(opt, shared)