```python
Load pretrained fastai model from the Hub or from a local directory.

Args:
repo_id (`str`):
The location where the pickled fastai.Learner is. It can be either of the two:
- Hosted on the Hugging Face Hub. E.g.: 'espejelomar/fatai-pet-breeds-classification' or 'distilgpt2'.
You can add a `revision` by appending `@` at the end of `repo_id`. E.g.: `dbmdz/bert-base-german-cased@main`.
Revision is the specific model version to use. Since we use a git-based system for storing models and other
artifacts on the Hugging Face Hub, it can be a branch name, a tag name, or a commit id.
- Hosted locally. `repo_id` would be a directory containing the pickle and a pyproject.toml
indicating the fastai and fastcore versions used to build the `fastai.Learner`. E.g.: `./my_model_directory/`.
revision (`str`, *optional*):
Revision at which the repo's files are downloaded. See documentation of `snapshot_download`.

Returns:
The `fastai.Learner` model in the `repo_id` repo.
```