Qwen3.6-35B-A3B-Heretic — REAP-pruned (30%, 256→180 experts)

This is a REAP (Router-weighted Expert Activation Pruning) compressed version of a Qwen3.5/3.6-35B-A3B hybrid linear-attention MoE (Heretic variant). 30% of the routed experts were pruned (256 → 180 per layer) using the Cerebras REAP saliency criterion.

Base This model
Routed experts / layer 256 180
Active experts / token 8 8
Decoder layers 40 (30 linear-attn + 10 full-attn) same
Hidden size 2048 2048
Size (BF16) ~70 GB ~50 GB

Pruning was performed with the layer-wise (block-wise) calibration observer on a c4 calibration set, reap saliency, seed 42. The model is text-only (the multimodal vision tower of the base Omni model was dropped during pruning).

Evaluation

Measured with lm-evaluation-harness against this model served on vLLM (pipeline-parallel, BF16):

Benchmark Setup Score
MMLU 5-shot, acc 73.25%
  – STEM 69.11%
  – Humanities 67.46%
  – Social Sciences 82.97%
  – Other 76.60%
HellaSwag 0-shot, acc_norm 82.55%
HellaSwag 0-shot, acc 63.06%

(30% of experts pruned; these scores indicate the model retains strong general knowledge and commonsense after compression.)

Architecture note (hybrid linear attention)

This is a hybrid model: 30/40 layers use Gated-DeltaNet linear attention (Mamba-style recurrent conv+SSM state) and 10/40 use full attention. Two consequences:

  • Hugging Face transformers: loads and generates correctly on a single device. Do not use device_map="auto" to split it across multiple GPUs — splitting the recurrent linear-attention state across devices produces garbage. Use one GPU (if it fits) or CPU.
  • vLLM: serve with pipeline parallelism across GPUs (--pipeline-parallel-size N --tensor-parallel-size 1). vLLM provides its own GatedDeltaNet kernels.

Method

REAP selects experts to prune that contribute minimally to the layer output by considering both the router gate-values and the average activation norm of the experts, preserving the router's independent control over the remaining experts (avoiding the functional-subspace collapse of expert merging).

Reproduce with cerebras/reap.

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