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

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.

Inizia in src/diffusers/utils/import_utils.py intorno alla riga 567 e controlla il messaggio relativo alla dipendenza mancante per l’import di pytorch_retinaface. Verifica il nome del pacchetto o la fonte in base ai controlli PyPI riportati nell’issue, quindi aggiorna l’indicazione in modo che punti a un percorso di installazione valido oppure ometta il comando pip; conferma il messaggio di errore risultante con i test pertinenti relativi agli import.