| |
| """1705.159.252 |
| |
| Automatically generated by Colab. |
| |
| Original file is located at |
| https://colab.research.google.com/drive/1SzDicEXWRqpiPKW8HkGdpUFIT-SbS8Xd |
| """ |
|
|
| import torch |
|
|
| def intersection_over_union(boxes_preds, boxes_labels, box_format="midpoint"): |
|
|
| if box_format == "midpoint": |
| box1_x1 = boxes_preds[..., 0:1] - boxes_preds[..., 2:3] / 2 |
| box1_y1 = boxes_preds[..., 1:2] - boxes_preds[..., 3:4] / 2 |
| box1_x2 = boxes_preds[..., 0:1] + boxes_preds[..., 2:3] / 2 |
| box1_y2 = boxes_preds[..., 1:2] + boxes_preds[..., 3:4] / 2 |
| box2_x1 = boxes_labels[..., 0:1] - boxes_labels[..., 2:3] / 2 |
| box2_y1 = boxes_labels[..., 1:2] - boxes_labels[..., 3:4] / 2 |
| box2_x2 = boxes_labels[..., 0:1] + boxes_labels[..., 2:3] / 2 |
| box2_y2 = boxes_labels[..., 1:2] + boxes_labels[..., 3:4] / 2 |
|
|
| elif box_format == "corners": |
| box1_x1 = boxes_preds[..., 0:1] |
| box_y1 = boxes_preds[..., 1:2] |
| box1_x2 = boxes_preds[..., 2:3] |
| box1_y2 = boxes_preds[..., 3:4] |
| box2_x1 = boxes_labels[...,0:1] |
| box2_y1 = boxes_labels[...,1:2] |
| box2_x2 = boxes_labels[...,2:3] |
| box2_y2 = boxes_labels[...,3:4] |
|
|
| x1 = torch.max(box1_x1, box2_x1) |
| y1 = torch.max(box1_y1, box2_y1) |
| x2 = torch.min(box1_x2, box2_x2) |
| y2 = torch.min(box1_y2, box2_y2) |
|
|
| intersection = (x2 - x1).clamp(0) * (y2- y1).clamp(0) |
|
|
| box1_area = abs((box1_x2 - box1_x1) * (box1_y1 - box1_y2)) |
| box2_area = abs((box2_x2 - box2_x1) * (box2_y1 - box2_y2)) |
|
|
| return intersection / (box1_area + box2_area - intersection + 1e-6) |
