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Evaluation of different anchor scales.
| Anchor base size | Number of anchors (scales) | Aspect ratios | mAP (%) |
| 3 scales, 3 ratios | {1282, 2562, 5122} | {2:1, 1:1, 1:2} | 75.2 |
| 5 scales, 3 ratios | {322, 642, 1282, 2562, 5122} | {2:1, 1:1, 1:2} | 81.1 |
| 6 scales, 3 ratios | {162, 322, 642, 1282, 2562, 5122} | {2:1, 1:1, 1:2} | 77.8 |
| 8 scales, 3 ratios | {322, 482, 642, 962, 1282, 1922, 2562, 5122} | {2:1, 1:1, 1:2} | 78.4 |
The meaning of the “bold” is the best experimental results.
