code: def __init__(self, opt, shared=None):
      self.datatype = opt["datatype"]
      build(opt)  # NOTE: the call to build here
      suffix = "test" if opt["datatype"].startswith("test") else "train"
      opt["datafile"] = os.path.join(opt["datapath"], "MATH", suffix)
      self.id = "math_dataset"
      self.math_random = random.Random(42)
      super().__init__(opt, shared)
  
imports: import glob
  import json
  import os
  import random
  import re
  from parlai.tasks.math_dataset.build import build
  from parlai.core.opt import Opt
  from parlai.core.params import ParlaiParser
  from parlai.utils.io import PathManager
  from typing import List, Optional
  from parlai.tasks.reasoning.agents import MWPStepsReasoningTeacher
label_desc: Use image node_id 2 to create a new MathDatasetStepByStepReasoningTeacher object from inherited base classes: MWPStepsReasoningTeacher with example: obj = MathDatasetStepByStepReasoningTeacher(opt, shared)