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Gemma 4 QAT Q4_0 MTP Assistants for ik_llama

This repo contains ik_llama-compatible GGUF assistant/draft models converted from Google's Gemma 4 QAT Q4_0 assistant checkpoints.

These are not standalone chat models. Use them as --model-draft files next to the matching Google Gemma 4 QAT Q4_0 target GGUF.

Do not load this repository as the primary model. Hugging Face may show generic GGUF usage snippets for this repo, but these files are assistant/draft GGUFs only.

Important E2B/E4B Caveat

The E2B and E4B files are experimental edge-model assistants. They converted and smoke-tested successfully with matched QAT targets after an ik_llama shared-KV target loader fix.

Current ik_llama main includes that loader fix via PR #1927. Older builds may fail before draft loading with errors such as:

E2B: missing blk.15.attn_k.weight
E4B: missing blk.24.attn_k.weight

Those target tensors appear intentionally absent in Google's QAT edge GGUFs: the E2B/E4B targets advertise shared-KV tail layers.

E4B has an additional runtime caveat. On current ik_llama main, local tests could load E4B QAT + matched E4B assistant and generate in a small CPU/offload smoke path. The longer full-GPU flash-attention path was still unstable before acceptance counters in our RTX 4070 test. Treat E4B as experimental until the remaining runtime/FA path is resolved upstream.

Use matched pairs only. The E2B assistant is not expected to work with the E4B target, and the E4B assistant is not expected to work with the E2B target.

Files

Model Q4_0 assistant
Gemma 4 E2B IT QAT Q4_0 gemma-4-E2B-it-qat-q4_0-MTP-ik_llama-Q4_0.gguf
Gemma 4 E4B IT QAT Q4_0 gemma-4-E4B-it-qat-q4_0-MTP-ik_llama-Q4_0.gguf
Gemma 4 12B IT QAT Q4_0 gemma-4-12B-it-qat-q4_0-MTP-ik_llama-Q4_0.gguf
Gemma 4 26B-A4B IT QAT Q4_0 gemma-4-26B-A4B-it-qat-q4_0-MTP-ik_llama-Q4_0.gguf
Gemma 4 31B IT QAT Q4_0 gemma-4-31B-it-qat-q4_0-MTP-ik_llama-Q4_0.gguf

BF16 conversion intermediates and Q8_0 reference variants are intentionally not published here. The Q4_0 files are the intended pairing for Google's QAT Q4_0 target GGUFs.

Matching Target Repos

Use the assistants with Google's official target GGUFs:

  • google/gemma-4-E2B-it-qat-q4_0-gguf
  • google/gemma-4-E4B-it-qat-q4_0-gguf
  • google/gemma-4-12B-it-qat-q4_0-gguf
  • google/gemma-4-26B-A4B-it-qat-q4_0-gguf
  • google/gemma-4-31B-it-qat-q4_0-gguf

Example

llama-server \
  -m /path/to/gemma-4-12b-it-qat-q4_0.gguf \
  --model-draft /path/to/gemma-4-12B-it-qat-q4_0-MTP-ik_llama-Q4_0.gguf \
  --spec-type mtp:n_max=4,p_min=0.0 \
  --jinja

Use a current ik_llama build with Gemma 4 MTP support. Reproducing these conversions from Google's safetensors currently requires convert_hf_to_gguf.py to recognize Gemma4UnifiedAssistantForCausalLM as the existing Gemma 4 MTP assistant converter path.

Validation

Local conversion metadata checks:

Model Tensors Backbone Centroid tensors
E2B 50 1536 yes
E4B 50 2560 yes
12B 48 3840 no, metadata only
26B-A4B 48 2816 no, metadata only
31B 48 5376 no, metadata only

All published files report general.architecture=gemma4_mtp.

Historical runtime smoke on an RTX 4070 with ik_llama build 4561 (6b9de3dba):

Target + Q4_0 draft Status Notes
E2B passed on shared-KV branch MTP context ready; raw completion generated; 37/92 draft tokens accepted
E4B passed on shared-KV branch MTP context ready; raw completion generated; 33/116 draft tokens accepted
12B passed MTP context ready; raw completion generated
26B-A4B passed MTP context ready; raw completion generated with CPU/system-RAM offload
31B passed MTP context ready; raw completion generated with CPU/system-RAM offload

Additional current-main check with ik_llama bbe1a511e:

Target + Q4_0 draft Status Notes
E2B passed full-GPU flash-attention direct-server request completed
E4B partial small CPU/offload -c 512 raw completion smoke passed; local full-GPU flash-attention path failed before acceptance counters

Conversion Notes

Source assistant repos:

  • google/gemma-4-E2B-it-qat-q4_0-unquantized-assistant
  • google/gemma-4-E4B-it-qat-q4_0-unquantized-assistant
  • google/gemma-4-12B-it-qat-q4_0-unquantized-assistant
  • google/gemma-4-26B-A4B-it-qat-q4_0-unquantized-assistant
  • google/gemma-4-31B-it-qat-q4_0-unquantized-assistant

The assistants were converted through ik_llama's Gemma 4 MTP assistant converter, then quantized with llama-quantize to Q4_0.

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