def testIOA(self):
boxes1 = np.array([[0.25, 0.25, 0.75, 0.75], [0.0, 0.0, 0.5, 0.75]],
dtype=np.float32)
boxes2 = np.array([[0.5, 0.25, 1.0, 1.0], [0.0, 0.0, 1.0, 1.0]],
dtype=np.float32)
ioa21 = np_box_ops.ioa(boxes2, boxes1)
expected_ioa21 = np.array([[0.5, 0.0], [1.0, 1.0]], dtype=np.float32)
self.assertAllClose(ioa21, expected_ioa21)
def ioa(boxlist1, boxlist2):
"""Computes pairwise intersection-over-area between box collections.
Intersection-over-area (ioa) between two boxes box1 and box2 is defined as
their intersection area over box2's area. Note that ioa is not symmetric,
that is, IOA(box1, box2) != IOA(box2, box1).
Args:
boxlist1: BoxList holding N boxes
boxlist2: BoxList holding M boxes
Returns:
a numpy array with shape [N, M] representing pairwise ioa scores.
"""
return np_box_ops.ioa(boxlist1.get(), boxlist2.get())