code: def __init__(self, n_class):
      super(DummyHead, self).__init__()
      self.n_class = n_class
  
imports: import numpy
  import unittest
  import chainer
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links.model.light_head_rcnn import LightHeadRCNN
  from chainercv.utils import assert_is_detection_link
  from chainercv.utils import generate_random_bbox
label_desc: Use image node_id 1 to create a new DummyHead object from inherited base classes: chainer with example: obj = DummyHead(n_class)