An unofficial Pytorch implementation of the paper "Circle Loss: A Unified Perspective of Pair Similarity Optimization".

https://arxiv.org/abs/2002.10857

Use CircleLoss in circle_loss.py, and there is a simple example of mnist in mnist_example.py.

For pair-wise labels, another implementation https://github.com/xiangli13/circle-loss is suggested.

Sorry for using master branch as dev. Some early implementations are kept in circle_loss_early.py.

CircleLossLikeCE is an early implementation to use CircleLoss in the paradigm of approaches like ArcFace. It only consists with the paper on a special case.

CircleLossBackward is an early implementation to avoid overflow in the method of applying backward with handcraft gradients. A negative sign is added to the Eq. 10 in this code to fix the equation. It's correct, stable but messy.

It has been said that the official implementation will be included in https://github.com/MegEngine.

Thanks very much for Yifan Sun's advice!