code: def __len__(self):
      return len(self.supervisions)
  
imports: import argparse
  import os
  from copy import deepcopy
  from pathlib import Path
  import lhotse
  import soundfile
  import torch
  import torchaudio
  import tqdm
  from torch.utils.data import DataLoader, Dataset
label_desc: Use image node_id 2 for calling the MicRanking obj's underlying member method code with example usage: obj.__len__() and returns: len