FreeAnchor: Learning to Match Anchors for Visual Object Detection

Code

• github.com/zhangxiaosong18/FreeAnchor
  OfficialIn paperpytorch★ 0
• github.com/MindSpore-paper-code-3/code10/tree/main/FreeAnchor
  mindspore★ 0

Abstract

Modern CNN-based object detectors assign anchors for ground-truth objects under the restriction of object-anchor Intersection-over-Unit (IoU). In this study, we propose a learning-to-match approach to break IoU restriction, allowing objects to match anchors in a flexible manner. Our approach, referred to as FreeAnchor, updates hand-crafted anchor assignment to "free" anchor matching by formulating detector training as a maximum likelihood estimation (MLE) procedure. FreeAnchor targets at learning features which best explain a class of objects in terms of both classification and localization. FreeAnchor is implemented by optimizing detection customized likelihood and can be fused with CNN-based detectors in a plug-and-play manner. Experiments on COCO demonstrate that FreeAnchor consistently outperforms their counterparts with significant margins.

Tasks

Benchmark Results

Reproductions