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