Upload sa_finetune_hrnet_w32.pt

Checkpoint: sa_finetune_hrnet_w32.pt

Training setup:
- Backbone: HRNet-W32, initialized from SuperAnimal-Quadruped pretrained weights
- Head: randomly initialized (SA-Quadruped head weights were NOT used)
- Fine-tuned end-to-end on the Animal3D dataset

The released file contains both the fine-tuned backbone and head, and can be loaded directly for inference.

sa_finetune_hrnet_w32.pt

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