experimentalmachines/Qwen3-4B-ExecuTorch

Qwen3-4B for ExecuTorch

ExecuTorch exports of Qwen/Qwen3-4B (revision 1cfa9a720891) for on-device inference with the openweights Android app or any ExecuTorch 1.4.0 runtime.

Files

Windows in this repo: XNNPACK (CPU) at 2k to 32k; Vulkan (GPU) at 2k to 32k; MediaTek NeuroPilot MT6991 (Dimensity 9400) at 2k to 4k. The window is fixed inside the file: the runtime allocates the whole KV cache at load, so pick the largest window the device can hold (fits_phone_budget in each folder's config.json is the estimate against a 5 GB budget).

Backend	Target	File	Window	Size	Smoke test
XNNPACK (CPU)	any arm64	xnnpack/Qwen3-4B-8da4w-gptq-2k.pte	2,048 tokens	2.66 GB	passed ("Paris")
XNNPACK (CPU)	any arm64	xnnpack/Qwen3-4B-8da4w-gptq-4k.pte	4,096 tokens	2.66 GB	passed ("Paris")
XNNPACK (CPU)	any arm64	xnnpack/Qwen3-4B-8da4w-gptq-8k.pte	8,192 tokens	2.67 GB	passed ("Paris")
XNNPACK (CPU)	any arm64	xnnpack/Qwen3-4B-8da4w-gptq-16k.pte	16,384 tokens	2.69 GB	passed ("Paris")
XNNPACK (CPU)	any arm64	xnnpack/Qwen3-4B-8da4w-gptq-32k.pte	32,768 tokens	2.72 GB	passed ("Paris")
Vulkan (GPU)	any arm64	vulkan/Qwen3-4B-vulkan-8da4w-2k.pte	2,048 tokens	3.42 GB	structure checked (no host NPU runtime)
Vulkan (GPU)	any arm64	vulkan/Qwen3-4B-vulkan-8da4w-4k.pte	4,096 tokens	3.43 GB	structure checked (no host NPU runtime)
Vulkan (GPU)	any arm64	vulkan/Qwen3-4B-vulkan-8da4w-8k.pte	8,192 tokens	3.46 GB	structure checked (no host NPU runtime)
Vulkan (GPU)	any arm64	vulkan/Qwen3-4B-vulkan-8da4w-16k.pte	16,384 tokens	3.51 GB	structure checked (no host NPU runtime)
Vulkan (GPU)	any arm64	vulkan/Qwen3-4B-vulkan-8da4w-32k.pte	32,768 tokens	3.61 GB	structure checked (no host NPU runtime)
MediaTek NeuroPilot	MT6991 (Dimensity 9400)	mtk/mt6991/Qwen3-4B-neuropilot-a16w8-2k-chunk1of4.pte	2,048 tokens	1.10 GB	structure checked (no host NPU runtime)
MediaTek NeuroPilot	MT6991 (Dimensity 9400)	mtk/mt6991/Qwen3-4B-neuropilot-a16w8-2k-chunk2of4.pte	2,048 tokens	1.10 GB	structure checked (no host NPU runtime)
MediaTek NeuroPilot	MT6991 (Dimensity 9400)	mtk/mt6991/Qwen3-4B-neuropilot-a16w8-2k-chunk3of4.pte	2,048 tokens	1.10 GB	structure checked (no host NPU runtime)
MediaTek NeuroPilot	MT6991 (Dimensity 9400)	mtk/mt6991/Qwen3-4B-neuropilot-a16w8-2k-chunk4of4.pte	2,048 tokens	1.49 GB	structure checked (no host NPU runtime)
MediaTek NeuroPilot	MT6991 (Dimensity 9400)	mtk/mt6991/Qwen3-4B-neuropilot-a16w8-4k-chunk1of4.pte	4,096 tokens	1.10 GB	structure checked (no host NPU runtime)
MediaTek NeuroPilot	MT6991 (Dimensity 9400)	mtk/mt6991/Qwen3-4B-neuropilot-a16w8-4k-chunk2of4.pte	4,096 tokens	1.10 GB	structure checked (no host NPU runtime)
MediaTek NeuroPilot	MT6991 (Dimensity 9400)	mtk/mt6991/Qwen3-4B-neuropilot-a16w8-4k-chunk3of4.pte	4,096 tokens	1.10 GB	structure checked (no host NPU runtime)
MediaTek NeuroPilot	MT6991 (Dimensity 9400)	mtk/mt6991/Qwen3-4B-neuropilot-a16w8-4k-chunk4of4.pte	4,096 tokens	1.49 GB	structure checked (no host NPU runtime)

MediaTek folders also hold the token embedding table the NeuroPilot runner reads from disk, shared by every window: mtk/mt6991/Qwen3-4B-neuropilot-embedding-fp32.bin.

Tokenizer: tokenizer.json, copied unchanged from the source repo. Each backend folder has a config.json listing every window as a variant with the metadata the .pte reports, and an export-report-<window>.json per file with the full export record.

Memory

• XNNPACK (CPU) at 2,048 tokens: the KV cache costs 294,912 bytes per token (fp32), 603,979,776 bytes for the whole window, allocated in full when the model loads.
• XNNPACK (CPU) at 4,096 tokens: the KV cache costs 294,912 bytes per token (fp32), 1,207,959,552 bytes for the whole window, allocated in full when the model loads.
• XNNPACK (CPU) at 8,192 tokens: the KV cache costs 294,912 bytes per token (fp32), 2,415,919,104 bytes for the whole window, allocated in full when the model loads.
• XNNPACK (CPU) at 16,384 tokens: the KV cache costs 294,912 bytes per token (fp32), 4,831,838,208 bytes for the whole window, allocated in full when the model loads.
• XNNPACK (CPU) at 32,768 tokens: the KV cache costs 294,912 bytes per token (fp32), 9,663,676,416 bytes for the whole window, allocated in full when the model loads.
• Vulkan (GPU) at 2,048 tokens: the KV cache costs 294,912 bytes per token (fp32), 603,979,776 bytes for the whole window, allocated in full when the model loads.
• Vulkan (GPU) at 4,096 tokens: the KV cache costs 294,912 bytes per token (fp32), 1,207,959,552 bytes for the whole window, allocated in full when the model loads.
• Vulkan (GPU) at 8,192 tokens: the KV cache costs 294,912 bytes per token (fp32), 2,415,919,104 bytes for the whole window, allocated in full when the model loads.
• Vulkan (GPU) at 16,384 tokens: the KV cache costs 294,912 bytes per token (fp32), 4,831,838,208 bytes for the whole window, allocated in full when the model loads.
• Vulkan (GPU) at 32,768 tokens: the KV cache costs 294,912 bytes per token (fp32), 9,663,676,416 bytes for the whole window, allocated in full when the model loads.

How it was made

• XNNPACK (CPU) any arm64: ExecuTorch 1.4.0 export_llm: 8-bit dynamic activations and 4-bit weights in groups of 32, int8 per-channel embeddings, XNNPACK with extended ops, prefill chunk 2048, fp32 KV cache. Built by run 1.
• Vulkan (GPU) any arm64: ExecuTorch 1.4.0 export_llm: 8-bit dynamic activations and 4-bit weights in groups of 32, int8 per-channel embeddings, the Vulkan delegate, prefill chunk 2048, fp32 KV cache. Built by run 1.
• MediaTek NeuroPilot MT6991 (Dimensity 9400): ExecuTorch 1.4.0 MediaTek LLM export (examples/mediatek, qwen.py): A16W8 (16-bit activations, 8-bit weights) calibrated on MediaTek's alpaca.txt prompts (9 of 9) in the qwen3.json chat template, cut into 4 chunks, with a 128-token prompt graph and a one-token generation graph over a 2048-token cache, compiled with MediaTek NeuroPilot Express SDK (mtk_converter 8.13.0+public, mtk_neuron 8.2.23) for MT6991 (Dimensity 9400). Built by run 1.
• MediaTek NeuroPilot MT6991 (Dimensity 9400): ExecuTorch 1.4.0 MediaTek LLM export (examples/mediatek, qwen.py): A16W8 (16-bit activations, 8-bit weights) calibrated on MediaTek's alpaca.txt prompts (9 of 9) in the qwen3.json chat template, cut into 4 chunks, with a 128-token prompt graph and a one-token generation graph over a 4096-token cache, compiled with MediaTek NeuroPilot Express SDK (mtk_converter 8.13.0+public, mtk_neuron 8.2.23) for MT6991 (Dimensity 9400). Built by run 1.

License

A quantized derivative of Qwen/Qwen3-4B, distributed under the same terms (apache-2.0). The upstream license files are included unchanged: LICENSE.

The mtk/ folders hold model binaries compiled with the MediaTek NeuroPilot Express SDK 8.0.8-build20250925 (mtk_converter 8.13.0+public, mtk_neuron 8.2.23) from MediaTek Inc., used under MediaTek's license terms for that SDK. No MediaTek SDK or runtime library is included. They run on MediaTek's LLM runner from ExecuTorch (examples/mediatek/executor_runner) with the device's NeuroPilot runtime; the settings it needs are in each folder's config.json, under each variant's runner.