Cleaner warning when loading pretrained models (#4557)
* Cleaner warning when loading pretrained models
This make more explicit logging messages when using the various `from_pretrained` methods. It also make these messages as `logging.warning` because it's a common source of silent mistakes.
* Update src/transformers/modeling_utils.py
Co-authored-by: Julien Chaumond <chaumond@gmail.com>
* Update src/transformers/modeling_utils.py
Co-authored-by: Julien Chaumond <chaumond@gmail.com>
* style and quality
Co-authored-by: Julien Chaumond <chaumond@gmail.com>
