code: def __len__(self):
      return len(self.queries)
  
file_path: sentence-transformers/examples/training/ms_marco/train_bi-encoder_mnrl.py
imports: import json
  from torch.utils.data import DataLoader
  from sentence_transformers import SentenceTransformer, LoggingHandler, util, models, losses, InputExample
  import logging
  from datetime import datetime
  import gzip
  import os
  import tarfile
  import tqdm
  from torch.utils.data import Dataset
  import random
  import pickle
  import argparse
label_desc: Use image node_id 3 for calling the MSMARCODataset obj's underlying member method code with example usage: obj.__len__() and returns: len