| | |
| | from ..utils import ext_loader |
| |
|
| | ext_module = ext_loader.load_ext('_ext', ['bbox_overlaps']) |
| |
|
| |
|
| | def bbox_overlaps(bboxes1, bboxes2, mode='iou', aligned=False, offset=0): |
| | """Calculate overlap between two set of bboxes. |
| | |
| | If ``aligned`` is ``False``, then calculate the ious between each bbox |
| | of bboxes1 and bboxes2, otherwise the ious between each aligned pair of |
| | bboxes1 and bboxes2. |
| | |
| | Args: |
| | bboxes1 (Tensor): shape (m, 4) in <x1, y1, x2, y2> format or empty. |
| | bboxes2 (Tensor): shape (n, 4) in <x1, y1, x2, y2> format or empty. |
| | If aligned is ``True``, then m and n must be equal. |
| | mode (str): "iou" (intersection over union) or iof (intersection over |
| | foreground). |
| | |
| | Returns: |
| | ious(Tensor): shape (m, n) if aligned == False else shape (m, 1) |
| | |
| | Example: |
| | >>> bboxes1 = torch.FloatTensor([ |
| | >>> [0, 0, 10, 10], |
| | >>> [10, 10, 20, 20], |
| | >>> [32, 32, 38, 42], |
| | >>> ]) |
| | >>> bboxes2 = torch.FloatTensor([ |
| | >>> [0, 0, 10, 20], |
| | >>> [0, 10, 10, 19], |
| | >>> [10, 10, 20, 20], |
| | >>> ]) |
| | >>> bbox_overlaps(bboxes1, bboxes2) |
| | tensor([[0.5000, 0.0000, 0.0000], |
| | [0.0000, 0.0000, 1.0000], |
| | [0.0000, 0.0000, 0.0000]]) |
| | |
| | Example: |
| | >>> empty = torch.FloatTensor([]) |
| | >>> nonempty = torch.FloatTensor([ |
| | >>> [0, 0, 10, 9], |
| | >>> ]) |
| | >>> assert tuple(bbox_overlaps(empty, nonempty).shape) == (0, 1) |
| | >>> assert tuple(bbox_overlaps(nonempty, empty).shape) == (1, 0) |
| | >>> assert tuple(bbox_overlaps(empty, empty).shape) == (0, 0) |
| | """ |
| |
|
| | mode_dict = {'iou': 0, 'iof': 1} |
| | assert mode in mode_dict.keys() |
| | mode_flag = mode_dict[mode] |
| | |
| | assert (bboxes1.size(-1) == 4 or bboxes1.size(0) == 0) |
| | assert (bboxes2.size(-1) == 4 or bboxes2.size(0) == 0) |
| | assert offset == 1 or offset == 0 |
| |
|
| | rows = bboxes1.size(0) |
| | cols = bboxes2.size(0) |
| | if aligned: |
| | assert rows == cols |
| |
|
| | if rows * cols == 0: |
| | return bboxes1.new(rows, 1) if aligned else bboxes1.new(rows, cols) |
| |
|
| | if aligned: |
| | ious = bboxes1.new_zeros(rows) |
| | else: |
| | ious = bboxes1.new_zeros((rows, cols)) |
| | ext_module.bbox_overlaps( |
| | bboxes1, bboxes2, ious, mode=mode_flag, aligned=aligned, offset=offset) |
| | return ious |
| |
|
