code: def _load_data(self, fold):
      dataset_fold = "dev" if fold == "valid" else fold
      fold_path = os.path.join(self.dpath, dataset_fold)
      schema_file = os.path.join(fold_path, "schema.json")
      with PathManager.open(schema_file, "r") as f:
          schema_lookup = {}
          for schema in json.load(f):
              schema_lookup[schema["service_name"]] = schema
  
      dialogues = []
      for filename in glob.glob(f"{fold_path}/dialogues*.json"):
          with PathManager.open(filename, "r") as f:
              dialogues += json.load(f)
  
      filter_path = self.opt.get("filter_dialogue_by_id", "")
      if len(filter_path) > 0:
          filtered = []
          with open(filter_path) as f:
              dialogues_to_get = json.load(f)[fold]
              for dialogue in dialogues:
                  if dialogue["dialogue_id"] in dialogues_to_get:
                      filtered.append(dialogue)
              assert len(filtered) == len(
                  dialogues_to_get
              ), f"Different number of dialogues found than requested. Are you sure you've got the right form of Google SGD? Did you filter for dialogue ids correctly? len(filtered) = {len(filtered)}, len(dialogues_to_get) = {len(dialogues_to_get)}"
          dialogues = filtered
      return schema_lookup, dialogues
  
imports: import glob
  import json
  import os
  from typing import Any, Dict, List, Optional
  import parlai.tasks.google_sgd.build
  import parlai.core.tod.tod_core
  import parlai.core.tod.tod_agents
  from parlai.core.tod.tod_core import SerializationHelpers
  from parlai.core.message import Message
  from parlai.core.metrics import AverageMetric
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  from fuzzywuzzy import fuzz
  from parlai.utils.io import PathManager
label_desc: Use image node_id 4 for calling the GoogleSGDParser obj's underlying member method code with example usage: obj._load_data(fold) and returns: schema_lookup,  dialogues