class_docstr: Dummy SSD Detection Dataset for CI/CD testing
  
  Args:
      opts: command-line arguments
code: def __len__(self) -> int:
      return 10
  
file_path: ml-cvnets/tests/dummy_datasets/ssd_detection.py
imports: import math
  from typing import Dict, Tuple
  import torch
  import torch.utils.data
  from cvnets.anchor_generator import build_anchor_generator
  from cvnets.matcher_det import build_matcher
label_desc: Use image node_id 4 for calling the DummySSDDetectionDataset obj's underlying member method code with example usage: obj.__len__() and returns: int