Missing-dependency error suggests `pip install pytorch_retinaface`, which is not a PyPI package

[shmulc8]

Bug

src/diffusers/utils/import_utils.py tells users to install the optional RetinaFace dependency with:

{0} requires the pytorch_retinaface library but it was not found in your environment. You can install it with pip: pip install pytorch_retinaface

pip install pytorch_retinaface cannot succeed: neither pytorch_retinaface nor its normalized form pytorch-retinaface exists on PyPI (both return HTTP 404 from https://pypi.org/pypi/<name>/json). The suggested command fails, and the name is currently unregistered on PyPI.

Version

Present in v0.40.0 (import_utils.py, line 567).

Reproduce

curl -s -o /dev/null -w '%{http_code}\n' https://pypi.org/pypi/pytorch_retinaface/json   # 404
curl -s -o /dev/null -w '%{http_code}\n' https://pypi.org/pypi/pytorch-retinaface/json   # 404

Suggested fix

Point the message at the actual distribution of the pytorch_retinaface import (the intended project/source or the correct PyPI name), or drop the pip install hint if there is no canonical PyPI package.

[asomoza]

Hi, can you please post a minimal reproduction code that triggers this? it seems you're correct but there isn't any code that triggers this

[shmulc8]

Hi, can you please post a minimal reproduction code that triggers this? it seems you're correct but there isn't any code that triggers this

Correct - there's no code path that reaches it. I found it by inspection, not at
runtime: the entry is registered in BACKENDS_MAPPING, but nothing calls
requires_backends(..., "pytorch_retinaface"), and is_pytorch_retinaface_available
is only re-exported from utils/__init__.py and never used.

Since it's dead code pointing at a package that doesn't exist, I'd just suggest
removing it. Happy to open a PR.