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Implementation of Quantization Support

Following the maintainers' guidance to contribute code rather than documentation, this PR implements the quantization feature discussed previously.

Problem: VibeVoice requires 20GB VRAM, blocking 90% of users
Solution: Optional quantization via --quantization parameter (8bit/4bit)
Result: Reduces VRAM to 12GB (8-bit) or 7GB (4-bit) with minimal quality loss

Key Features:

  • Selective quantization (only LLM, audio components at full precision)
  • VRAM detection with automatic recommendations
  • Backward compatible (defaults to fp16)
  • Based on proven approaches (FabioSarracino Q8, ComfyUI wrapper)

Ready for testing and feedback. Happy to make adjustments as needed!

@maitrisavaliya
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This PR addresses the CUDA Out of Memory issue discussed in #152

Following the maintainers' feedback that the project needs code-based solutions rather than documentation, I've implemented optional quantization support to directly solve the VRAM limitation problem.

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Pay attention to your code agent. DO NOT introduce bugs like this.

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@maitrisavaliya maitrisavaliya Dec 10, 2025

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Will pay attention to this, and I have corrected it.
What are your thoughts on the quantization approach? Is it going in right direction or Should I change something?

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