code: def __len__(self):
      return 10
  
imports: import sys
  import pytest
  import torch
  from torch import nn
  from torch.utils.data import Dataset
  from kornia.x import Configuration, ObjectDetectionTrainer
  from kornia.x.trainer import Accelerator
label_desc: Use image node_id 1 for calling the DummyDatasetDetection obj's underlying member method code with example usage: obj.__len__() and returns: int