Model Details of gemma-4-26B-A4B-it-assistant-GGUF
Gemma 4 26B-A4B Assistant — GGUF (Atomic Chat)
GGUF builds of
google/gemma-4-26B-A4B-it-assistant
— the official Gemma 4
Multi-Token Prediction (MTP)
drafter for
google/gemma-4-26B-A4B-it
. Use it as a speculative-decoding
draft model alongside the matching Gemma 4 target to get a meaningful decoding
speedup at zero quality loss.
These GGUFs use the custom
gemma4_assistant
architecture and
will not
load in stock
llama.cpp
. They require the
atomic-llama-cpp-turboquant
fork, which adds:
the
gemma4_assistant
MTP drafter arch (incl. the centroid LM head for E2B/E4B),
A ready-made launcher lives at
scripts/run-gemma4-26b-a4b-mtp-server.sh
in the fork (
MTP_PRESET=throughput|lift|balanced|quality
).
How MTP works here
Gemma 4 ships with a small "assistant" head that predicts several future tokens
from the target model's last hidden state. In
atomic-llama-cpp-turboquant
it
is loaded as a separate GGUF via
--mtp-head
and drives a custom speculative
decoder (block_size 3, draft_max 16 for quality preset). The verifier runs the target model in
parallel, guaranteeing the same output distribution as plain greedy/sampled
decoding.
TurboQuant KV cache
turbo3
is the KV-cache quantization scheme used in this fork; it significantly
reduces KV memory and bandwidth at long contexts with no measurable quality
regression on Gemma 4. Apply it to both target and drafter via
-ctk turbo3 -ctv turbo3 -ctkd turbo3 -ctvd turbo3
.
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