can not generate scene graph for visualization

[Lazy-poe]

When I run the scene_graph_tuning.py with args you show in the readme, I can't get the scene graph in the window of '3D scene graph'. Are there any code or args I need to modify?
What the arg(detect_cnt_thres, default equal 2) means? I find that the node_feature.ix[node_num]['detection_cnt'] is always equal 1. The code in vis_tuning.py is always run:
if node_feature.ix[node_num]['detection_cnt'] < cnt_thres: continue

.