LFM ONNX HF Library

Install

pip install lfm-onnx-hf

Python Usage

Basic Prompt (sync, stream=False)

from lfm_onnx_hf import LFMOnnxEngine, GenerationConfig

engine = LFMOnnxEngine()

text = engine.basic_prompt(
    "What is the capital of France?",
    stream=False,
    generation=GenerationConfig(
        max_new_tokens=64,
        temperature=0.0,
        top_k=50,
        repetition_penalty=1.05,
        seed=42,
    ),
)
print(text)

Basic Prompt (sync, stream=True)

from lfm_onnx_hf import LFMOnnxEngine

engine = LFMOnnxEngine()

for chunk in engine.basic_prompt("Write a one-line poem about the sea.", stream=True):
    print(chunk, end="", flush=True)
print()

Basic Prompt + Assistant Prefill

from lfm_onnx_hf import LFMOnnxEngine

engine = LFMOnnxEngine()

text = engine.basic_prompt(
    "Return strict JSON with fields city and country.",
    assistant_prefill="```json\n",
    stop_tokens=["```"],
    stream=False,
)
print(text)

Chat Input (sync, stream=False)

from lfm_onnx_hf import LFMOnnxEngine

engine = LFMOnnxEngine()

turns = [
    {"role": "user", "content": "My name is Ana."},
    {"role": "user", "content": "What is my name?"},
]

text = engine.chat_input(turns, stream=False)
print(text)

Chat Input (sync, stream=True)

from lfm_onnx_hf import LFMOnnxEngine

engine = LFMOnnxEngine()

turns = [{"role": "user", "content": "Give me 3 short productivity tips."}]

for chunk in engine.chat_input(turns, stream=True):
    print(chunk, end="", flush=True)
print()

Full Generate API (sync)

from lfm_onnx_hf import LFMOnnxEngine

engine = LFMOnnxEngine()

messages = [{"role": "user", "content": "Explain recursion in 2 sentences."}]
text, stats = engine.generate(
    messages=messages,
    max_new_tokens=80,
    temperature=0.1,
    top_k=50,
    repetition_penalty=1.05,
    seed=7,
    assistant_prefill="",
    stop_tokens=["```"],
)

print(text)
print(stats)

Async Usage (stream=False and stream=True)

import asyncio
from lfm_onnx_hf import LFMOnnxEngine


async def main():
    engine = LFMOnnxEngine()

    # async non-stream
    text = await engine.basic_prompt_async(
        "One word for water in French?",
        stream=False,
        stop_tokens=["```"],
    )
    print(text)

    # async stream
    stream_iter = await engine.chat_input_async(
        [{"role": "user", "content": "List 5 planets."}],
        stream=True,
    )
    async for chunk in stream_iter:
        print(chunk, end="", flush=True)
    print()


asyncio.run(main())

Hugging Face Source

By default, first use downloads from:

• Repo: cnmoro/LFM-Q4-GGUFS
• Subfolder: 2_5_350m
• Model: model_q4.slim.spec.strip.min.onnx

CLI Usage

Basic

lfm-onnx-hf \
  --prompt "What is the capital of France?" \
  --max-new-tokens 64 \
  --temperature 0.0

Stream Output

lfm-onnx-hf \
  --prompt "Write a short haiku about rain" \
  --stream

Assistant Prefill

lfm-onnx-hf \
  --prompt "Return strict JSON with fields city and country" \
    --assistant-prefill '```json\n' \
    --stop-token '```'

Multi-turn Messages

lfm-onnx-hf \
  --messages-json '[{"role":"system","content":"Be concise."},{"role":"user","content":"Summarize photosynthesis in one paragraph."}]'

HF Options

lfm-onnx-hf \
  --repo-id cnmoro/LFM-Q4-GGUFS \
  --subfolder 2_5_350m \
  --model model_q4.slim.spec.strip.min.onnx \
  --download-max-retries 8 \
  --download-initial-backoff 1.5

Common CLI Options

• --repo-id
• --subfolder
• --model
• --revision
• --token
• --cache-root
• --prompt
• --system
• --messages-json
• --max-new-tokens
• --temperature
• --top-k
• --repetition-penalty
• --seed
• --stream
• --assistant-prefill
• --stop-token (repeatable)
• --benchmark-runs
• --provider
• --intra-op-threads
• --inter-op-threads
• --download-max-retries
• --download-initial-backoff