code: def __len__(self):
      return 1
  
file_path: NeMo/nemo/collections/nlp/data/language_modeling/megatron/request_dataset.py
imports: from typing import Dict, List
  import torch
  from torch.utils.data.dataset import Dataset
label_desc: Use image node_id 3 for calling the T5RequestDataset obj's underlying member method code with example usage: obj.__len__() and returns: int