Question about arcface_torch Model Zoo OneDrive Folder Structure

As I read the [doc](https://github.com/deepinsight/insightface/blob/master/recognition/arcface_torch/docs/eval.md#inference) fo inference, and I noticed that we only need to pass the `backbone.pth` to the script is enough.
However, when I open the OneDrive link of each model folders for example the [glint360k_cosface_r100_fp16_0.1](https://onedrive.live.com/?redeem=aHR0cHM6Ly8xZHJ2Lm1zL3UvcyFBc3dwc0RPMnRvTktxMGxXWTY5dk41OEdSNm13P2U9cDlPdjVk&id=4A83B6B633B029CC%215582&cid=4A83B6B633B029CC), it not only contain `backbone.pth`, but also contains other Pytorch file such as `rank_0_softmax_weight.pt, rank_0_softmax_weight_mom.pt`. So, what is the usage of those files?