an error in forward function

[SicongLiu998]

Thanks for your error report and we appreciate it a lot.

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!