an error in forward function

[SicongLiu998]

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Checklist

1. I have searched related issues but cannot get the expected help.
2. The bug has not been fixed in the latest version.

Describe the bug
A clear and concise description of what the bug is.
File "/home/lsc/桌面/mmdBox/mmdetection/mmdet/models/losses/eqlv2.py", line 68, in expand_label
target[torch.arange(self.n_i), gt_classes] = 1
IndexError: tensors used as indices must be long, byte or bool tensors

Reproduction

1. What command or script did you run?

I tried to use the loss function in yolox
bash tools/dist_train.sh  /home/lsc/桌面/mmdBox/mmdetection/configs/yolox /yolox_s_eqlv2_8x8_300e_coco.py  1

A placeholder for the command.

2. Did you make any modifications on the code or config? Did you understand what you have modified?
3. What dataset did you use?

Environment

1. Please run python mmdet/utils/collect_env.py to collect necessary environment information and paste it here.
2. You may add addition that may be helpful for locating the problem, such as
   • How you installed PyTorch [e.g., pip, conda, source]
     follow the official way of mmdetection of v2.25.2
   • Other environment variables that may be related (such as $PATH, $LD_LIBRARY_PATH, $PYTHONPATH, etc.)
   • sys.platform: linux
     Python: 3.8.13 | packaged by conda-forge | (default, Mar 25 2022, 06:04:18) [GCC 10.3.0]
     CUDA available: True
     GPU 0: NVIDIA GeForce RTX 3090
     CUDA_HOME: None
     GCC: gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0
     PyTorch: 1.10.0

Error traceback
If applicable, paste the error trackback here.

A placeholder for trackback.

Bug fix
If you have already identified the reason, you can provide the information here. If you are willing to create a PR to fix it, please also leave a comment here and that would be much appreciated!