Unloading vision model of VLMs for Exllamav3 backend #393
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This change ensures that when unloading vlm their vision part is also unloaded.
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This is a small PR that ensures that vision model of a VLM is unloaded and doesn't stay in VRAM indefinitely.
I've used a few exl3 VLMs and noticed that after unloading them a noticeable amount of VRAM was kept reserved by TabbyAPI.
Exl3 backend unload function was missing code to unload the vision part.