Where does hugging face's transformers save models?
### Feature request

A clear instruction of receving the downloaded weight in system. 

### Motivation

Running the below code downloads a model - does anyone know what folder it downloads it to?

```
!pip install -q transformers
from transformers import pipeline
model = pipeline('fill-mask')
```

### Your contribution

Same issue with diffusers.
This is described in the [installation page of the doc](https://huggingface.co/docs/transformers/installation#cache-setup).<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.