def nms(dets,proba, T):
dets = dets.astype("float")
if len(dets) == 0:
return []
x1 = dets[:, 0]
y1 = dets[:, 1]
x2 = dets[:, 2]
y2 = dets[:, 3]
scores = proba
areas = (x2 - x1 + 1) * (y2 - y1 + 1)
order = scores.argsort()[::-1]
keep = []
while order.size > 0:
i = order[0]
keep.append(i)
xx1 = sp.maximum(x1[i], x1[order[1:]])
yy1 = sp.maximum(y1[i], y1[order[1:]])
xx2 = sp.minimum(x2[i], x2[order[1:]])
yy2 = sp.minimum(y2[i], y2[order[1:]])
w = sp.maximum(0.0, xx2 - xx1 + 1)
h = sp.maximum(0.0, yy2 - yy1 + 1)
inter = w * h
ovr = inter / (areas[i] + areas[order[1:]] - inter)
inds = sp.where(ovr <= T)[0]
order = order[inds + 1]
return keep
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