code: def __len__(self):
      return len(self.frames)
  
file_path: clearml/examples/hyperdatasets/data-ingestion/pytorch_dataset_example_with_masks.py
imports: import numpy
  import torch.utils.data
  from allegroai import DataView, FrameGroup, Task
  from PIL import Image
  from torch.utils.data import DataLoader
label_desc: Use image node_id 3 for calling the ExampleDataset obj's underlying member method code with example usage: obj.__len__() and returns: len