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- # --------------------------------------------------------
- # Fast R-CNN
- # Copyright (c) 2015 Microsoft
- # Licensed under The MIT License [see LICENSE for details]
- # Written by Ross Girshick
- # --------------------------------------------------------
- import numpy as np
- def py_cpu_nms(dets, thresh):
- """Pure Python NMS baseline."""
- x1 = dets[:, 0]
- y1 = dets[:, 1]
- x2 = dets[:, 2]
- y2 = dets[:, 3]
- scores = dets[:, 4]
- areas = (x2 - x1 + 1) * (y2 - y1 + 1)
- order = scores.argsort()[::-1]
- keep = []
- while order.size > 0:
- i = order[0]
- keep.append(i)
- xx1 = np.maximum(x1[i], x1[order[1:]])
- yy1 = np.maximum(y1[i], y1[order[1:]])
- xx2 = np.minimum(x2[i], x2[order[1:]])
- yy2 = np.minimum(y2[i], y2[order[1:]])
- w = np.maximum(0.0, xx2 - xx1 + 1)
- h = np.maximum(0.0, yy2 - yy1 + 1)
- inter = w * h
- ovr = inter / (areas[i] + areas[order[1:]] - inter)
- inds = np.where(ovr <= thresh)[0]
- order = order[inds + 1]
- return keep
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