code: def num_nodes(self, node_type: str) -> int:
      if node_type != "paper":
          raise ValueError(f"Invalid node type {node_type}")
  
      return 111_059_956 * self.__replication_factor
  
imports: from .dataset import Dataset
  from typing import Dict, Tuple, Union
  import pandas
  import torch
  import numpy
  from sklearn.model_selection import train_test_split
  import gc
  import os
  import json
label_desc: Use image node_id 11 for calling the OGBNPapers100MDataset obj's underlying member method code with example usage: obj.num_nodes(node_type) and returns: unknown