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# YOLOv5 🚀 by Ultralytics, GPL-3.0 license
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"""
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Model validation metrics
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"""
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import numpy as np
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def bbox_ioa(box1, box2, eps=1e-7):
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"""Returns the intersection over box2 area given box1, box2. Boxes are x1y1x2y2
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box1: np.array of shape(4)
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box2: np.array of shape(nx4)
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returns: np.array of shape(n)
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"""
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# Get the coordinates of bounding boxes
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b1_x1, b1_y1, b1_x2, b1_y2 = box1
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b2_x1, b2_y1, b2_x2, b2_y2 = box2.T
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# Intersection area
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inter_area = (np.minimum(b1_x2, b2_x2) - np.maximum(b1_x1, b2_x1)).clip(0) * \
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(np.minimum(b1_y2, b2_y2) - np.maximum(b1_y1, b2_y1)).clip(0)
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# box2 area
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box2_area = (b2_x2 - b2_x1) * (b2_y2 - b2_y1) + eps
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# Intersection over box2 area
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return inter_area / box2_area
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