code: def get_label_frequencies(self):
      label_freqs = Counter()
      for row in self.data:
          label_freqs.update(row["label"])
      return label_freqs
  
imports: import json
  import os
  from collections import Counter
  import torch
  import torchvision
  import torchvision.transforms
  from PIL import Image
  from torch import nn
  from torch.utils.data import Dataset
label_desc: Use image node_id 4 for calling the JsonlDataset obj's underlying member method code with example usage: obj.get_label_frequencies() and returns: label_freqs