class_docstr: Mocks Faster RCNN Network
code: def summary(self):
      return tf.summary.scalar("dummy", 1, collections=["rcnn"])
  
imports: import sonnet
  import tempfile
  import tensorflow
  from easydict import EasyDict
  from luminoth.train import run
  from luminoth.models import get_model
  from luminoth.utils.config import get_model_config, load_config_files, get_base_config
label_desc: Use image node_id 7 for calling the MockFasterRCNN obj's underlying member method code with example usage: obj.summary() and returns: tf