class_docstr: Dummy Segmentation Dataset for CI/CD testing
  
  Args:
      opts: command-line arguments
code: def __len__(self) -> int:
      return 10
  
imports: from typing import Dict, Tuple
  import torch
  import torch.utils.data
label_desc: Use image node_id 3 for calling the DummySegmentationDataset obj's underlying member method code with example usage: obj.__len__() and returns: int