code: def forward(self, x):
      _, _, H, W = x.shape
      return _random_array(
          self.xp, (1, 8, H // self.feat_stride, W // self.feat_stride)
      )
  
imports: import numpy
  import chainer
  from chainercv.links.model.faster_rcnn import FasterRCNN
  from chainercv.utils import generate_random_bbox
label_desc: Use image node_id 2 for calling the DummyExtractor obj's underlying member method code with example usage: obj.forward(x) and returns: _random_array