code: def __len__(self):
      return len(self.samples)
  
file_path: megatron-lm/tasks/race/data.py
imports: import glob
  import json
  import os
  import time
  from torch.utils.data import Dataset
  from megatron import print_rank_0
  from tasks.data_utils import build_sample
  from tasks.data_utils import build_tokens_types_paddings_from_ids
  from tasks.data_utils import clean_text
label_desc: Use image node_id 2 for calling the RaceDataset obj's underlying member method code with example usage: obj.__len__() and returns: len