loom-fun/bartowski-LFM3-1.7B-loom

LFM3-1.7B (Q4_K_M) for AMD Loom

A Loom package (.loom programs and a model.json card) for the unmodified GGUF checkpoint bartowski/LFM3-1.7B-GGUF (LFM3-1.7B-Q4_K_M.gguf), generated on an AMD Ryzen AI Max+ 395 "Strix Halo" with the loom-skills workflow.

Quick start

pip install "hrx-loom[hf]"
loom-fetch https://huggingface.co/loom-fun/bartowski-LFM3-1.7B-loom/resolve/main/model.json --materialize=copy --output=LFM3-1.7B
loom-serve --model=LFM3-1.7B/model.json --device=amdgpu

The server listens on 127.0.0.1:8080 and answers OpenAI-style /v1/chat/completions requests.

Performance vs llama.cpp

metric	llama.cpp	Loom	margin	roofline	Loom % of roofline	DevLab llama.cpp	DevLab Loom	local ÷ DevLab (llama.cpp, Loom)
decode tok/s, short prompt	100.9	148.3	+47 %	204.8	72 %	125.5	137.5 ¹	0.80, 1.08
decode tok/s, 2k context	108.7	152.4	+40 %	217.4	70 %	121.8	146.0 ¹	0.89, 1.04
decode tok/s, 32k context	85.9	102.3	+19 %	155.8	66 %	100.5	100.9 ¹	0.85, 1.01
prefill tok/s, 1k document	3346.6	6553.5	+96 %	19878.9	33 %	4921.8	5764.4 ¹	0.68, 1.14
prefill tok/s, 2k document	3558.6	6600.4	+85 %	19715.6	33 %	4843.1	5669.9 ¹	0.73, 1.16
prefill tok/s, 8k document	4406.0	6152.6	+40 %	18789.8	33 %	4985.1	5785.7 ¹	0.88, 1.06
prefill tok/s, 16k document	3747.1	6053.0	+62 %	17682.6	34 %	4064.6	4840.4 ¹	0.92, 1.25
prefill tok/s, 32k document	3077.1	5482.1	+78 %	15818.4	35 %	3307.6	4046.2 ¹	0.93, 1.35
4 streams, aggregate decode tok/s	279.8	398.7	+42 %	814.8	49 %	273.5	320.7 ¹	1.02, 1.24
speculative decoding, drafted tokens accepted	—	11 % ²	—	n/a	n/a	n/a	n/a	n/a

• llama.cpp: build llamacpp-rocm/b1370, server arguments -ngl 99 -cram 0 -c 35024 -kvu -np 4.
• Loom: speculative decoding on (n-gram prompt lookup, depth 2).
• Same GGUF on both engines, tokens per second. Loom: client-side timing; llama.cpp: server-side timings. Runs per value: decode and prefill 2 (mean), 4 streams 3 (median).
• Measured 2026-11-07; device AMD RYZEN AI MAX+ 395 w/ Radeon 8060S, AMD Radeon 8060S Graphics, Ubuntu 26.04; hrx-loom 0.1.0 (hrx-system d01d1c1); source: local run.
• ¹ Measured 2026-11-07; device AMD RYZEN AI MAX+ 395 w/ Radeon 8060S, AMD Radeon 8060S Graphics, Ubuntu 24.04; hrx-loom 0.1.0 (hrx-system d01d1c1); source: DevLab Dispatch run 42400660629.
• ² Measured 2026-11-07; device AMD RYZEN AI MAX+ 395 w/ Radeon 8060S, AMD Radeon 8060S Graphics, Ubuntu 24.04; hrx-loom 0.1.0 (hrx-system d01d1c1); source: DevLab Dispatch run 42412313298.
• DevLab: the same measurement on an AMD DevLab Dispatch Strix Halo runner; local ÷ DevLab is the local value over the DevLab value of each engine, recorded for comparison, not a verdict.
• Drafted tokens accepted: the share of the drafter's proposed tokens the model accepted during the spec gate's requests.
• Roofline: the hardware ceiling for this GGUF on AMD Ryzen AI Max+ 395 "Strix Halo" (gfx1151) at 216 GB/s and 59 TFLOP/s, from loom-roofline roofline.py (loom-skills a05730e); decode and 4 streams with speculative decoding: verify passes × (1 + acceptance × depth 2) tokens per pass, the drafter's cost not counted; acceptance measured in the row's own session: decode 2 %, decode at 2k 7 %, decode at 32k 4 %, 4 streams 4 %.
• — not measured; n/a not applicable.

Features

feature	status	detail
API	✅	OpenAI-style /v1/chat/completions
tool calling	✅	OpenAI-style tools and tool_calls
reasoning / thinking	✅	on by default; chat_template_kwargs: {"enable_thinking": false} turns it off
reasoning effort	❌	not supported
speculative decoding	✅	n-gram prompt lookup, depth 2, on by default
image input	❌	not supported
audio input / output	❌	not supported
sampling	✅	temperature, top_p, top_k, seed
context size	✅	262,144 tokens per request
concurrency	✅	4 concurrent requests
max output tokens	✅	4,096 (preset max_tokens)

Correctness

gate	description	result
kernel_tests	Unit tests of the generated kernels against reference implementations	✅ pass (60/60) ¹
golden	llama.cpp reference recorded on the same GGUF: greedy tokens and top-5 log-probs, short prompts and 1k-32k documents	✅ pass ²
compare	Greedy output vs the llama.cpp reference, token by token; every divergence is a near-tie	✅ pass ²
vision	Image input vs llama.cpp with the same projector: identical prompt tokens, replies equal up to near-ties	— not applicable
consistency	Concurrent requests give the same output as the same requests run alone	✅ pass ²
spec	Speculative decoding on gives exactly the output of speculative decoding off	✅ pass ²
agent	Multi-turn tool-calling loop: exact prompt rendering, history reuse, valid tool calls, output vs llama.cpp	✅ pass ²
agent_think_off	The tool-calling loop with thinking off	✅ pass ²
sampling	temperature, top_k and seed behave as specified; first-token distribution matches llama.cpp	✅ pass ²
needle	Needle-in-a-haystack prompt at up to half the context, compared with llama.cpp; over-capacity prompt refused	✅ pass ³
needle_full	Needle-in-a-haystack prompt at the full context is served	✅ pass ²
decision	Decision answers (choice, score, noul probabilities) vs llama.cpp on the same prompts	— not applicable

• ¹ DevLab Dispatch run 42400660629, 2026-11-07; device AMD RYZEN AI MAX+ 395 w/ Radeon 8060S, AMD Radeon 8060S Graphics, Ubuntu 24.04; hrx-loom 0.1.0 (hrx-system d01d1c1).
• ² DevLab Dispatch run 42412313298, LEVEL=full, 2026-11-07; device AMD RYZEN AI MAX+ 395 w/ Radeon 8060S, AMD Radeon 8060S Graphics, Ubuntu 24.04; hrx-loom 0.1.0 (hrx-system d01d1c1).
• ³ DevLab Dispatch run 42400660629, LEVEL=full, 2026-11-07; device AMD RYZEN AI MAX+ 395 w/ Radeon 8060S, AMD Radeon 8060S Graphics, Ubuntu 24.04; hrx-loom 0.1.0 (hrx-system d01d1c1).
• Gates are the loom-benchmark correctness gates (gates.sh); a gate without a recorded run shows no evidence.

Files

• model.json / model.json.lock: the card and the pinned source files (sha256 checked by loom-fetch).
• program/*.loom, weights.loom: the generated Loom programs.
• tokenizer.json: the tokenizer.
• llm_config.json: the configuration the programs were generated from.
• info.json: the measurements, gate evidence and versions this card shows; everything else comes from the files above.
• REPORT.md: how the values above were measured: setup, commands and the value of every run.

Versions: card schema loom-card/2; loom-skills e66eebd; hrx-loom 0.1.0 (hrx-system d01d1c1); card generator fc6b3b1.

Source files, fetched by loom-fetch from their own repositories:

• checkpoint: bartowski/LFM3-1.7B-GGUF @ 9693095, LFM3-1.7B-Q4_K_M.gguf