code: def generate_dummy_splits(num_graphs: int) -> ArrayDict:
      """Create simple train/validation/test split indices."""
      one_third_split = num_graphs // 3
      return {
          "train": np.arange(0, one_third_split),
          "valid": np.arange(one_third_split, 2 * one_third_split),
          "test": np.arange(2 * one_third_split, 3 * one_third_split),
      }
  
file_path: datasets/tensorflow_datasets/datasets/ogbg_molpcba/dummy_data_generation.py
imports: import collections
  import itertools
  import random
  from typing import Dict, Iterable, List, Text
  from absl import app
  from absl import flags
  from etils import epath
  import numpy
  from tensorflow_datasets.core import utils
  from tensorflow_datasets.core.utils import resource_utils
  from tensorflow_datasets.core.utils.lazy_imports_utils import pandas
label_desc: Use image node_id 2 for calling a global function with example usage: generate_dummy_splits(num_graphs) and returns: dict