Hy-MT2-1.8B-SpecDraft-30B

Experimental Speculative Decoding Draft Model for Hy-MT2-30B-A3B

This is an experimental project that modifies Hy-MT2-1.8B into a speculative decoding draft model for Hy-MT2-30B-A3B.

Acceleration is not guaranteed. This project is mainly for users who want to explore speculative decoding on MoE models.

Technical Details

The original vocabularies are different:

• Hy-MT2-1.8B: 120818 tokens
• Hy-MT2-30B-A3B: 120832 tokens

The model was modified by:

1. Replacing tokenizer with the Hy-MT2-30B-A3B tokenizer.
2. Expanding embedding and lm_head weights:
   • [120818, 2048] -> [120832, 2048]
3. Initializing new token embeddings with mean padding.

In speculative decoding, the draft model only proposes candidate tokens. The target model Hy-MT2-30B-A3B always performs final verification, so final output quality is not affected.

Usage

llama-server ^
  -m Hy-MT2-30B-A3B-APEX-Imatrix-I-Quality.gguf ^
  --spec-type draft-simple ^
  --spec-draft-model Hy-MT2-1.8B-SpecDraft-30B-Q4_K_M.gguf ^
  --spec-draft-ngl 999 ^
  --spec-draft-n-max 4 ^
  --spec-draft-n-min 3 ^
  --flash-attn on ^
  --gpu-layers 999

Performance Notes

Hy-MT2-30B-A3B is a MoE model with around 3B active parameters.

Because its decoding speed is already very high, speculative decoding may not always improve performance.

Possible results:

• faster
• similar speed
• slightly slower

depending on hardware and llama.cpp scheduling behavior.

This project is intended for: - llama.cpp enthusiasts - large VRAM users - MoE speculative decoding experiments

License

Follows the original Hy-MT2 license. For research and experimental use only.