how to use the nms method

[auroua]

from nms2.nms import py_nms_wrapper, cpu_nms_wrapper, gpu_nms_wrapper

boxes2 = np.array([
		    [0, 100, 0, 0, 100, 0, 100, 100, 0.99],
			[10, 110, 10, 10, 130, 10, 150, 110, 0.88],#keep 0.68
	        [150, 250, 150, 150, 250, 150, 250, 250, 0.77],  # keep 0.0
			[20, 50, 50, 20, 120, 50, 50, 120, 0.66],#discard 0.70
         ], dtype=np.float32)
nms = gpu_nms_wrapper(0.6, 0)
keep = nms(boxes2)
print(keep)

This is a simple test code about the gpunms. The output of this code is [2, 1, 3, 0].
Does this result correct?