Update README to lite version.

Update the bibtex.

Update birefnet.py

Update README.md

Correct the `_name_or_path ` in config.json.

Update portrait seg weights with added mae loss.

Add pip installation in README.

Capitalize the BiRefNet when used as the HF model name.

Improve the README.

Update README for portrait-related content.

Add BiRefNet model trained only on portrait segmentation data.

Upload BiRefNet-portrait-TR_P3M_10k-epoch_120.pth

Update README.md

initial commit