Anchor-based 與 Anchor-free

1. Feature Selective Anchor-Free Module for Single-Shot Object Detection 參考：CVPR2019 | CMU提出Single-Shot目標檢測最強算法：FSAF 2. FCOS: Fully Convolutional One-Stage Object Detection 參考：最新的Anchor-Free目標檢測模型FCOS

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