code: def get_data_for_fold(self, fold):
      data = self.load_data()
      # Synthetically split train/test/valid splits.
      # ASDiv has 2305 problems.
      VALID_SAMPLES = 200
      TEST_SAMPLES = 300
      if "test" not in self.datatype:
          if "valid" in self.datatype:
              data = data[TEST_SAMPLES : TEST_SAMPLES + VALID_SAMPLES]
          elif "train" in self.datatype:
              data = data[TEST_SAMPLES + VALID_SAMPLES :]
          else:
              raise RuntimeError(
                  f"Not a viable datatype {self.datatype}!"
              )
      else:
          data = data[:TEST_SAMPLES]
  
      for problem in data:
          question = problem["problem"]
          answer = problem["solution"]
          steps = [problem["equation"]]
          yield {"question": question, "answer": answer, "steps": steps}
  
file_path: ParlAI/parlai/tasks/asdiv/agents.py
imports: import xml.etree.ElementTree
  import os
  from .build import build
  from parlai.core.opt import Opt
  from parlai.core.params import ParlaiParser
  from typing import Optional
  from tasks.reasoning.agents import MWPStepsReasoningTeacher
label_desc: Use image node_id 4 for calling the ASDivStepByStepReasoningTeacher obj's underlying member method code with example usage: obj.get_data_for_fold(fold) without return types