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# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
import logging
import unittest
import torch
from detectron2.modeling.box_regression import Box2BoxTransform, Box2BoxTransformRotated
logger = logging.getLogger(__name__)
def random_boxes(mean_box, stdev, N):
return torch.rand(N, 4) * stdev + torch.tensor(mean_box, dtype=torch.float)
class TestBox2BoxTransform(unittest.TestCase):
def test_reconstruction(self):
weights = (5, 5, 10, 10)
b2b_tfm = Box2BoxTransform(weights=weights)
src_boxes = random_boxes([10, 10, 20, 20], 1, 10)
dst_boxes = random_boxes([10, 10, 20, 20], 1, 10)
devices = [torch.device("cpu")]
if torch.cuda.is_available():
devices.append(torch.device("cuda"))
for device in devices:
src_boxes = src_boxes.to(device=device)
dst_boxes = dst_boxes.to(device=device)
deltas = b2b_tfm.get_deltas(src_boxes, dst_boxes)
dst_boxes_reconstructed = b2b_tfm.apply_deltas(deltas, src_boxes)
assert torch.allclose(dst_boxes, dst_boxes_reconstructed)
def random_rotated_boxes(mean_box, std_length, std_angle, N):
return torch.cat(
[torch.rand(N, 4) * std_length, torch.rand(N, 1) * std_angle], dim=1
) + torch.tensor(mean_box, dtype=torch.float)
class TestBox2BoxTransformRotated(unittest.TestCase):
def test_reconstruction(self):
weights = (5, 5, 10, 10, 1)
b2b_transform = Box2BoxTransformRotated(weights=weights)
src_boxes = random_rotated_boxes([10, 10, 20, 20, -30], 5, 60.0, 10)
dst_boxes = random_rotated_boxes([10, 10, 20, 20, -30], 5, 60.0, 10)
devices = [torch.device("cpu")]
if torch.cuda.is_available():
devices.append(torch.device("cuda"))
for device in devices:
src_boxes = src_boxes.to(device=device)
dst_boxes = dst_boxes.to(device=device)
deltas = b2b_transform.get_deltas(src_boxes, dst_boxes)
dst_boxes_reconstructed = b2b_transform.apply_deltas(deltas, src_boxes)
assert torch.allclose(dst_boxes[:, :4], dst_boxes_reconstructed[:, :4], atol=1e-5)
# angle difference has to be normalized
assert torch.allclose(
(dst_boxes[:, 4] - dst_boxes_reconstructed[:, 4] + 180.0) % 360.0 - 180.0,
torch.zeros_like(dst_boxes[:, 4]),
atol=1e-4,
)
if __name__ == "__main__":
unittest.main()
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