what's the --box2d meaning?

[tigerdhl]

the "test" command is
"python main.py --mode test --gpu [gpu_id] --image [test_image_path] --box2d [test_2d_boxes_path] --model [model_path] --output "
and I get the model by trained the model, now I want to test in the new data, but the box2d label unknow for the new data.
I am not sure only the imagedata and the model are enough for the test?