list the paper for recently anchor free detector

• |CornerNet|CornerNet: Keypoint Triplets for Object Detection |[arXiv' 18]| [pdf] |1808|
• |CornerNet-Lite| CornerNet-Lite: Efficient Keypoint Based Object Detection |[arXiv' 19]||[pdf] |1904|
• ||Segmentations is All You Need |[arXiv' 19]||[pdf] |1904|
• |FCOS| FCOS: Fully Convolutional One-Stage Object Detection|[arXiv' 19]||[pdf] |1904|
• |Fovea|FoveaBox: Beyond Anchor-based Object Detector|[arXiv' 19]||[pdf] |1904|
• |CenterNet| Objects as Points|[arXiv' 19]||[pdf] |1904|
• |ExtremeNet|Bottom-up Object Detection by Grouping Extreme and Center Points|[arXiv' 19]||[pdf] |1901|
• |DuBox|DuBox: No-Prior Box Objection Detection via Residual Dual Scale Detectors|[arXiv' 19]||[pdf] |1904|

• |CornerNet| (official, Pytorch) https://github.com/princeton-vl/CornerNet
• |CornerNet-Lite| (official, Pytorch) https://github.com/princeton-vl/CornerNet-Lite
• |FCOS| (official, Pytorch) https://github.com/tianzhi0549/FCOS
• |CenterNet| (official, Pytorch) https://github.com/xingyizhou/CenterNet
• |ExtremeNet| (official, Pytorch) https://github.com/xingyizhou/ExtremeNet