FadedRedStar/LFM2.5-350M-heretic-imatrix-GGUF

🤖 LFM2.5-350M-heretic — Importance Matrix GGUF

This repository hosts importance-matrix (imatrix) optimized GGUF weights, available in multiple quantization formats, for LFM2.5-350M-heretic, quantized from the source floating-point tensors provided by coder3101/LFM2.5-350M-heretic.

🔄 Sister Repository: Check out the Standard GGUF Sister Repository for uncalibrated and full 8-bit precision options.

🎯 Matrix-Weighted Calibration (Imatrix)

An Importance Matrix (imatrix) calculation tracks activations across network layers using a calibration sequence, then weights the quantization process to preserve the parameters that matter most for output quality — improving fidelity at low bit depths.

➡️ Calibration dataset: Bartowski's calibration_datav5.txt.

• IQ4_NL is included because the matrix enables a non-linear 4-bit format that outperforms standard linear 4-bit quantization.
• Q8_0 is absent because 8-bit quantization already introduces near-zero degradation, making calibration unnecessary — see the standard sister repository for that variant.

ℹ️ Model Profile & Core Features

LFM2.5-350M is the smallest text-only model in Liquid AI's Liquid Foundation Model 2.5 series, built for extreme on-device and edge deployment. It shares the family's hybrid architecture of double-gated LIV (Liquid, Input-adaptive, Value-selective) convolution layers interleaved with GQA (Grouped Query Attention) layers, pre-trained on 28 trillion tokens with large-scale reinforcement learning post-training. Despite its size, it is tuned for instruction following, lightweight tool calling, and structured data extraction, with day-one support across llama.cpp, MLX, vLLM, SGLang, ONNX, and OpenVINO.

The heretic suffix denotes post-processing via the Heretic v1.3.0 method performed by coder3101, which removes refusal conditioning while preserving the model's lightweight instruction-following behavior.

📋 Technical Specifications

Property	Value
Base Architecture	LFM2 hybrid (double-gated LIV conv + GQA)
Developed by	Liquid AI
Total Parameters	350M
Primary Use	Instruction following, lightweight tool calling, structured extraction
Context Window	131,072 tokens
Training Budget	28 trillion tokens
Languages	English, Arabic, Chinese, French, German, Japanese, Korean, Spanish, Portuguese
Abliteration Tool	Heretic v1.3.0
Prompt Format	ChatML

🛠️ Heretic Overrides (ARA)

Property	Value
direction_index	per layer
attn.o_proj.max_weight	1.08
attn.o_proj.max_weight_position	10.46
attn.o_proj.min_weight	0.87
attn.o_proj.min_weight_distance	3.56
mlp.down_proj.max_weight	1.44
mlp.down_proj.max_weight_position	12.00
mlp.down_proj.min_weight	1.22
mlp.down_proj.min_weight_distance	1.97

📊 Refusal Bypass Metrics

The metrics below are self-reported by the original model author (coder3101) and have not been independently reproduced.

Metric	This model	Original (LiquidAI/LFM2.5-350M)
KL divergence	0.0440	0 (by definition)
Refusals	6/100	90/100

🧮 Numerical & Tensor Formats

Property	Value
Quantization Types	IQ4_NL, Q4_K_M, Q5_K_M (all with imatrix calibration)
Importance Matrix	Bartowski's calibration_datav5.txt

📦 Available Model Files

Main model weights

Filename	Quantization	llama.cpp Build	Size	Download
LFM2.5-350M-heretic-IQ4_NL-imatrix.gguf	IQ4_NL	b9860	209 MB	📥 Download
LFM2.5-350M-heretic-Q4_K_M-imatrix.gguf	Q4_K_M	b9860	219 MB	📥 Download
LFM2.5-350M-heretic-Q5_K_M-imatrix.gguf	Q5_K_M	b9860	248 MB	📥 Download

🎛️ Component Pairing Guide

Download exactly one main weights file:

• IQ4_NL: Non-linear 4-bit format, best choice for constrained memory when imatrix calibration is present.
• Q4_K_M: Balanced 4-bit format suitable for most everyday use.
• Q5_K_M: Higher-fidelity mid-range format recommended as a general default.

⚡ Deployment & Execution Commands

Liquid AI recommends the following generation parameters for best results: temperature: 0.1, top_k: 50, repetition_penalty: 1.05.

Swap the -m filename below for either quantized file depending on your size/quality trade-off preference.

llama.cpp CLI

./llama-cli \
  -m LFM2.5-350M-heretic-IQ4_NL-imatrix.gguf \
  -c 8192 \
  -ngl 99 \
  --temp 0.3 \
  --top-k 40 \
  --repeat-penalty 1.05 \
  -p "<|im_start|>system\nYou are a concise, helpful assistant.<|im_end|>\n<|im_start|>user\nState the capital of Italy and one interesting fact about it.<|im_end|>\n<|im_start|>assistant\n"

OpenAI-Compatible API Server

./llama-server \
  --host 0.0.0.0 \
  --port 8080 \
  -m LFM2.5-350M-heretic-IQ4_NL-imatrix.gguf \
  -c 16384 \
  -ngl 99 \
  --flash-attn

💬 Chat Templates & Prompt Design (ChatML)

<|im_start|>system
You are a capable assistant. Follow instructions precisely.<|im_end|>
<|im_start|>user
Your task or query here.<|im_end|>
<|im_start|>assistant

⚠️ Safety & Operational Notes

• This model is abliterated and will generate content that standard aligned models refuse. Use responsibly and in compliance with applicable laws.
• This is a text-only model — it has no vision encoder and cannot process images.
• Despite its small footprint, IFBench and structured-extraction benchmarks show substantial generational gains over LFM2 predecessors.
• Best suited for constrained hardware: CPUs, NPUs, and edge devices rather than complex reasoning workloads.
• Imatrix calibration improves perplexity recovery compared to non-imatrix quantization, particularly on low-frequency tokens.
• IQ4_NL produces a smaller file than Q4_K_M and tends to run faster on CPU and ARM devices; imatrix calibration narrows the quality gap between the two formats considerably.