code: def num_tokens(self, index):
      return self.size(index)
  
imports: import json
  import logging
  import os
  import random
  from pathlib import Path
  import numpy
  import torch
  import torch.utils.data
  from .None import data_utils
  from fairseq.data.fairseq_dataset import FairseqDataset
label_desc: Use image node_id 8 for calling the CodeDataset obj's underlying member method code with example usage: obj.num_tokens(index) and returns: self