cannot import name 'RegNetModel' from 'transformers'
### System Info

```shell
python                    3.8 
transformers              4.18.0
```


### Who can help?

_No response_

### Information

- [ ] The official example scripts
- [ ] My own modified scripts

### Tasks

- [ ] An officially supported task in the `examples` folder (such as GLUE/SQuAD, ...)
- [ ] My own task or dataset (give details below)

### Reproduction

from transformers import RegNetModel

### Expected behavior

```shell
how to import RegNetModel ?
```

RegNet is currently only available from the main branch, it will be included it in the next release. You can install it as follows:

`pip install git+https://github.com/huggingface/transformers.git`

