code: def __len__(self):
      return self.data.shape[0]
  
imports: import pandas
  import os
  import torch
  from pathlib import Path
  import pickle
  import logging
  import shutil
  from torch.utils.data import Dataset, TensorDataset, DataLoader, RandomSampler, SequentialSampler
  from torch.utils.data.distributed import DistributedSampler
  from transformers import AutoTokenizer
label_desc: Use image node_id 3 for calling the LRFinderDataset obj's underlying member method code with example usage: obj.__len__() and returns: self