Upload 1705_159_252.py

1705_159_252.py

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+# -*- coding: utf-8 -*-
+"""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)