Fix SyntaxError in YOLOWorldDetector.reparameterize

[amrutur]

Summary

yolo_world/models/detectors/yolo_world.py:61 contains a literal SyntaxError:

self.text_feats, None = self.backbone.forward_text(texts)

None is a Python keyword and cannot appear on the left-hand side of an
assignment. Importing the package fails immediately with:

SyntaxError: cannot assign to None

Introduced in commit 1f12bca ("add mask"), 2025-02-27.

Fix

Both forward_text() implementations in yolo_world/models/backbones/mm_backbone.py
return a single tensor, not a tuple:

• PseudoLanguageBackbone.forward_text at L172 returns text_embeds
• MultiModalYOLOBackbone.forward_text at L234 returns txt_feats

The other two call sites at L163 and L168 treat the return value as a
single value. The tuple-unpack here was spurious.

Fix by dropping the unpack:

self.text_feats = self.backbone.forward_text(texts)

This is a one-line, one-file change.

Test plan

• python -c "import yolo_world" succeeds
• from yolo_world.models.detectors import YOLOWorldDetector succeeds
• demo/image_demo.py completes end-to-end with V2.1 L checkpoints (verified locally against both l_stage1-7d280586.pth at 640 resolution and l_stage2-b3e3dc3f.pth at 1280 resolution, since image_demo.py calls model.reparameterize(texts) at runtime)

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