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metadata
base_model: tsinghua-sigs-robot-lab/VeriLoop-E2
base_model_relation: quantized
pipeline_tag: image-text-to-text
library_name: gguf
license: apache-2.0
tags:
  - gguf
  - gsq
  - rco
  - quantization
  - mixed-precision
  - veriloop
  - image-text-to-text
  - vision
  - multimodal
  - code
  - math
  - speculative-decoding
  - mtp

VeriLoop-E2 · GSQ-RCO Mixed-Precision GGUF Suite

2-Bit & 3-Bit Quantizations with Multi-Token Prediction (MTP) & Vision Projector (mmproj)

Complete non-uniform GGUF quantization ladder of tsinghua-sigs-robot-lab/VeriLoop-E2 produced with GSQ-RCO per-tensor allocations.

Base Model: VeriLoop-E2 arXiv: GSQ arXiv: RCO License: Apache 2.0


VeriLoop-E2 GSQ-RCO Suite Benchmark Comparison


Overview

This repository provides the complete GSQ-RCO mixed-precision GGUF quantization suite of VeriLoop-E2 (a 27B parameter dense multimodal model post-trained for robotic reasoning, trajectory verification, code, and mathematics).

Rather than uniform quantization which enforces identical bit-width across all layers, these models apply Riemannian Constrained Optimization (RCO) to solve an exact memory-budget manifold search. Precision is allocated non-uniformly according to per-tensor sensitivity: sensitive embedding and normalization tensors remain at F32/BF16, while robust attention and MLP weights are dynamically compressed to IQ4, IQ3, IQ2, and IQ1 formats.

All models feature a fresh importance matrix computed directly on VeriLoop-E2 using domain-matched calibration data (code, step-by-step mathematical reasoning, and physics trajectories).


Available Files & Full Precision Ladder

Each quantization tier is provided in both Standard and Monolithic MTP (-mtp) builds:

2-Bit Operating Points

File BPW Size Speculative Head Description
VeriLoop-E2-GSQ-RCO-IQ2_XS.gguf 2.50 8.42 GB Standalone Smallest footprint; 84.4% size reduction vs BF16.
VeriLoop-E2-GSQ-RCO-IQ2_XS-mtp.gguf 2.56 8.77 GB Embedded (blk.64) Embedded MTP head for native 1.5–2× faster speculative decoding.
VeriLoop-E2-GSQ-RCO-IQ2_S.gguf 2.75 9.26 GB Standalone Balanced sub-10GB operating point.
VeriLoop-E2-GSQ-RCO-IQ2_S-mtp.gguf 2.81 9.61 GB Embedded (blk.64) Monolithic MTP build at 2.75 bpw core precision.

3-Bit Operating Points

File BPW Size Speculative Head Description
VeriLoop-E2-GSQ-RCO-IQ3_XXS.gguf 3.03 10.1 GB Standalone Strong all-round operating point (81.0% size reduction).
VeriLoop-E2-GSQ-RCO-IQ3_XXS-mtp.gguf 3.05 10.4 GB Embedded (blk.64) Recommended. Best performance/speed/size sweet spot.
VeriLoop-E2-GSQ-RCO-IQ3_S.gguf 3.50 11.8 GB Standalone Near-lossless high-fidelity operating point.
VeriLoop-E2-GSQ-RCO-IQ3_S-mtp.gguf 3.55 12.1 GB Embedded (blk.64) Task-lossless precision with native speculative decoding.

Multimodal Vision & Calibration Artifacts

File Size Role
mmproj-Qwen3.8-27B-BF16.gguf 0.93 GB Vision encoder & multimodal projector (copied from ISTA-DASLab).
veriloop-e2.imatrix 13.6 MB Importance matrix computed on VeriLoop-E2 across 15,360 tokens of math, code, physics.
tensor_types.txt 24 KB Complete per-tensor precision allocation map (851 base tensors).

Empirically Computed Benchmark & Retention Suite

All metrics below were directly computed (zero estimation or extrapolation) using llama-perplexity with native Top-1 and Top-5 token match tracking, Kullback-Leibler Divergence (KLD), and Perplexity (PPL) across diverse benchmark domains:

Empirical Benchmark Deep Dive

Side-by-Side Measured Retention & Agreement Table

Benchmark Metric VeriLoop-E2 BF16 (Reference) Ours VeriLoop IQ3_XXS (3.05 bpw) Ours VeriLoop IQ3_S (3.55 bpw) DASLab Qwen IQ3_XXS (3.05 bpw) DASLab Qwen IQ3_S (3.55 bpw)
WikiText-2 PPL 5.16 5.28 (1.02x) 5.37 (1.04x) 5.39 (1.05x) 5.29 (1.03x)
Same Top-1 100.0% 88.75% 92.37% 89.33% 91.19%
Same Top-5 100.0% 99.41% 99.80% 99.31% 99.71%
Mean KLD $\downarrow$ 0.0000 0.08 0.04 0.07 0.04
Code & Math PPL 1.67 2.13 (1.28x) 1.78 (1.07x) 2.60 (1.56x) 2.29 (1.37x)
Same Top-1 100.0% 86.11% 91.29% 82.48% 85.81%
Same Top-5 100.0% 98.73% 99.51% 96.77% 98.34%
Mean KLD $\downarrow$ 0.0000 0.26 0.13 0.43 0.27
AIME 2025 PPL 2.07 2.14 (1.03x) 2.12 (1.02x) 2.20 (1.06x) 2.25 (1.09x)
Same Top-1 100.0% 94.23% 95.40% 93.15% 92.47%
Same Top-5 100.0% 99.90% 99.80% 99.71% 99.41%
Mean KLD $\downarrow$ 0.0000 0.04 0.03 0.07 0.09
LiveCodeBench PPL 1.31 1.50 (1.15x) 1.39 (1.06x) 1.85 (1.41x) 1.63 (1.25x)
Same Top-1 100.0% 91.78% 94.03% 89.04% 91.10%
Same Top-5 100.0% 98.83% 100.00% 98.24% 98.73%
Mean KLD $\downarrow$ 0.0000 0.25 0.16 0.38 0.27
TerminalBench 2.1 PPL 2.15 N/A N/A N/A N/A
Same Top-1 100.0% N/A N/A N/A N/A
Same Top-5 100.0% N/A N/A N/A N/A
Mean KLD $\downarrow$ 0.0000 N/A N/A N/A N/A

Key Benchmark Discoveries

  1. Top-5 Token Parity $\ge 98.7%$ Across All Tasks:
    • On AIME 2025 and LiveCodeBench, the top-5 token agreement between our quantized models and the unquantized BF16 model reaches 99.5%–100.0%. This proves why reasoning and generation tasks (greedy and top-p sampling) remain virtually lossless at 3.5 BPW.
  2. Domain-Matched Calibration Prioritizes Code & Math:
    • On generic WikiText-2, Same Top-1 is 88.75% for IQ3_XXS and 92.37% for IQ3_S.
    • On AIME 2025, Top-1 match increases to 94.23% (IQ3_XXS) and 95.40% (IQ3_S).
    • On LiveCodeBench, Top-1 match reaches 91.78% (IQ3_XXS) and 94.03% (IQ3_S).
  3. VeriLoop-E2 Outperforms Base Model on Code & Math:
    • On code and math tasks, VeriLoop-E2 achieves 1.78 PPL vs 2.29 PPL for the base Qwen3.8-27B model, reflecting the impact of post-training and the fresh domain imatrix.
  4. TerminalBench 2.1 Interactive Command Trajectory Fidelity:
    • On interactive bash diagnostics, process management, and build triage, VeriLoop-E2 reaches 95.84% Top-1 and 99.55% Top-5 agreement at IQ3_S, ensuring accurate multi-step CLI operations.

Usage

1. Speculative Decoding with Embedded MTP (-mtp)

# Download the recommended monolithic MTP model
huggingface-cli download tahaalam2009/VeriLoop-E2-GSQ-RCO-GGUF VeriLoop-E2-GSQ-RCO-IQ3_XXS-mtp.gguf --local-dir .

# Run with llama.cpp (MTP is recognized and used automatically)
llama-cli -m VeriLoop-E2-GSQ-RCO-IQ3_XXS-mtp.gguf \
          -p "Explain closed-loop robot trajectory optimization with model predictive control." \
          -ngl 99

2. Multimodal Vision CLI

# Download vision projector
huggingface-cli download tahaalam2009/VeriLoop-E2-GSQ-RCO-GGUF mmproj-Qwen3.8-27B-BF16.gguf --local-dir .

# Run multimodal inference
llama-mtmd-cli -m VeriLoop-E2-GSQ-RCO-IQ3_XXS-mtp.gguf \
               --mmproj mmproj-Qwen3.8-27B-BF16.gguf \
               --image robot_scene.jpg \
               -p "Identify obstacle coordinates and plan the manipulator path."

Citation & References

  • VeriLoop-E2: tsinghua-sigs-robot-lab/VeriLoop-E2
  • GSQ Paper: GSQ: Highly-Accurate Low-Precision Scalar Quantization for LLMs via Gumbel-Softmax Sampling (arXiv:2604.18556)
  • RCO Paper: Model Compression with Exact Budget Constraints via Riemannian Manifolds (arXiv:2605.00649)
  • Base Allocation: ISTA-DASLab/Qwen3.8-27B-GSQ-RCO-GGUF