Instructions to use hotdogs/frankenmoe with libraries, inference providers, notebooks, and local apps. Follow these links to get started.
- Notebooks
- Google Colab
- Kaggle
- Local Apps Settings
- llama.cpp
How to use hotdogs/frankenmoe with llama.cpp:
Install (macOS, Linux)
curl -LsSf https://llama.app/install.sh | sh # Start a local OpenAI-compatible server with a web UI: llama serve -hf hotdogs/frankenmoe:Q4_K_M # Run inference directly in the terminal: llama cli -hf hotdogs/frankenmoe:Q4_K_M
Install from WinGet (Windows)
winget install llama.cpp # Start a local OpenAI-compatible server with a web UI: llama serve -hf hotdogs/frankenmoe:Q4_K_M # Run inference directly in the terminal: llama cli -hf hotdogs/frankenmoe:Q4_K_M
Use pre-built binary
# Download pre-built binary from: # https://github.com/ggerganov/llama.cpp/releases # Start a local OpenAI-compatible server with a web UI: ./llama-server -hf hotdogs/frankenmoe:Q4_K_M # Run inference directly in the terminal: ./llama-cli -hf hotdogs/frankenmoe:Q4_K_M
Build from source code
git clone https://github.com/ggerganov/llama.cpp.git cd llama.cpp cmake -B build cmake --build build -j --target llama-server llama-cli # Start a local OpenAI-compatible server with a web UI: ./build/bin/llama-server -hf hotdogs/frankenmoe:Q4_K_M # Run inference directly in the terminal: ./build/bin/llama-cli -hf hotdogs/frankenmoe:Q4_K_M
Use Docker
docker model run hf.co/hotdogs/frankenmoe:Q4_K_M
- LM Studio
- Jan
- Ollama
How to use hotdogs/frankenmoe with Ollama:
ollama run hf.co/hotdogs/frankenmoe:Q4_K_M
- Unsloth Desktop
- Docker Model Runner
How to use hotdogs/frankenmoe with Docker Model Runner:
docker model run hf.co/hotdogs/frankenmoe:Q4_K_M
- Lemonade
How to use hotdogs/frankenmoe with Lemonade:
Pull the model
# Download Lemonade from https://lemonade-server.ai/ lemonade pull hotdogs/frankenmoe:Q4_K_M
Run and chat with the model
lemonade run user.frankenmoe-Q4_K_M
List all available models
lemonade list
- Atomic Chat
Upload WHITEPAPER.md with huggingface_hub
Browse files- WHITEPAPER.md +596 -0
WHITEPAPER.md
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| 1 |
+
---
|
| 2 |
+
title: "FrankenMoE: Domain-Specialized Expert Models via LoRA Fine-Tuning β A Practical Study"
|
| 3 |
+
subtitle: "Building Mixture-of-Experts from Dense LLMs with Open-Source Tools"
|
| 4 |
+
author: "UKA (nu-w-nutboy02)"
|
| 5 |
+
date: "May 2026"
|
| 6 |
+
affiliation: "Independent Research β hotdogs/frankenmoe"
|
| 7 |
+
abstract: >
|
| 8 |
+
This paper presents a practical pipeline for creating domain-specialized
|
| 9 |
+
expert models by fine-tuning a base language model (Qwen2.5-1.5B-Instruct)
|
| 10 |
+
with LoRA on domain-specific datasets (coding, mathematics, chat), then
|
| 11 |
+
attempting to assemble them into a Mixture-of-Experts (MoE) architecture
|
| 12 |
+
using mergekit. We document 7 phases spanning data preparation, fine-tuning,
|
| 13 |
+
LoRA-to-dense merging, MoE assembly, router training, evaluation, and GGUF
|
| 14 |
+
export. While the mergekit-based Qwen2Moe assembly produced corrupted
|
| 15 |
+
weights due to a tensor mapping incompatibility, the individual dense
|
| 16 |
+
expert models achieved high-quality domain specialization. We present a
|
| 17 |
+
lightweight Simple Router as a practical fallback that routes prompts to
|
| 18 |
+
the correct expert via keyword classification, achieving correct routing
|
| 19 |
+
with no additional training cost.
|
| 20 |
+
tags: [llm, lora, peft, mixture-of-experts, mergekit, qwen2.5, fine-tuning, gguf]
|
| 21 |
+
---
|
| 22 |
+
|
| 23 |
+
# FrankenMoE: Domain-Specialized Expert Models via LoRA Fine-Tuning
|
| 24 |
+
|
| 25 |
+
**A Practical Study in Building Mixture-of-Experts from Dense LLMs**
|
| 26 |
+
|
| 27 |
+
---
|
| 28 |
+
|
| 29 |
+
## Table of Contents
|
| 30 |
+
|
| 31 |
+
1. [Introduction](#1-introduction)
|
| 32 |
+
2. [Related Work](#2-related-work)
|
| 33 |
+
3. [Methodology](#3-methodology)
|
| 34 |
+
4. [Pipeline Architecture](#4-pipeline-architecture)
|
| 35 |
+
5. [Phase-by-Phase Results](#5-phase-by-phase-results)
|
| 36 |
+
6. [MoE Assembly: Success and Failure](#6-moe-assembly-success-and-failure)
|
| 37 |
+
7. [Simple Router: A Practical Alternative](#7-simple-router-a-practical-alternative)
|
| 38 |
+
8. [GGUF Export & Deployment](#8-gguf-export--deployment)
|
| 39 |
+
9. [Benchmarks & Evaluation](#9-benchmarks--evaluation)
|
| 40 |
+
10. [Discussion](#10-discussion)
|
| 41 |
+
11. [Conclusion & Future Work](#11-conclusion--future-work)
|
| 42 |
+
12. [References](#12-references)
|
| 43 |
+
|
| 44 |
+
---
|
| 45 |
+
|
| 46 |
+
## 1. Introduction
|
| 47 |
+
|
| 48 |
+
Large language models (LLMs) have demonstrated remarkable capabilities across
|
| 49 |
+
diverse domains, but their general-purpose nature often leads to suboptimal
|
| 50 |
+
performance on specialized tasks compared to domain-specific models. Mixture-of-Experts
|
| 51 |
+
(MoE) architectures [1, 2] offer a compelling solution: multiple specialized "expert"
|
| 52 |
+
sub-networks that activate conditionally based on input.
|
| 53 |
+
|
| 54 |
+
This paper documents a complete end-to-end pipeline for creating domain-specialized
|
| 55 |
+
experts from a single base model and assembling them into an MoE architecture. We
|
| 56 |
+
target three domains:
|
| 57 |
+
|
| 58 |
+
- **Coding**: Python, algorithms, software engineering
|
| 59 |
+
- **Mathematics**: Equation solving, proofs, calculus
|
| 60 |
+
- **Chat**: General conversation, knowledge recall
|
| 61 |
+
|
| 62 |
+
All work was conducted on consumer-grade GPUs (RTX 3060 Γ4, RTX 4060 Ti 16GB,
|
| 63 |
+
and RTX 8000 48GB on cloud), demonstrating that domain specialization is
|
| 64 |
+
accessible without enterprise infrastructure.
|
| 65 |
+
|
| 66 |
+
### 1.1 Key Contributions
|
| 67 |
+
|
| 68 |
+
1. A reproducible 7-phase pipeline for LoRA fine-tuning β dense merging β MoE assembly
|
| 69 |
+
2. Identification of a tensor mapping bug in mergekit's QwenMoE architecture for Qwen2.5 models
|
| 70 |
+
3. A lightweight **Simple Router** alternative that achieves domain routing without MoE merge
|
| 71 |
+
4. Full GGUF quantization and HuggingFace deployment of all artifacts
|
| 72 |
+
5. Open-source release of all models, training data, and code
|
| 73 |
+
|
| 74 |
+
---
|
| 75 |
+
|
| 76 |
+
## 2. Related Work
|
| 77 |
+
|
| 78 |
+
### 2.1 Mixture-of-Experts in LLMs
|
| 79 |
+
|
| 80 |
+
The MoE architecture, first introduced by Jacobs et al. [3] and popularized in
|
| 81 |
+
LLMs by Shazeer et al. [1], replaces dense feed-forward layers with multiple
|
| 82 |
+
expert sub-networks governed by a learned router. Recent open-source MoE models
|
| 83 |
+
include Mixtral 8Γ7B [4], Qwen2-MoE [5], and DeepSeek-MoE [6].
|
| 84 |
+
|
| 85 |
+
### 2.2 LoRA Fine-Tuning
|
| 86 |
+
|
| 87 |
+
Low-Rank Adaptation (LoRA) [7] enables parameter-efficient fine-tuning by
|
| 88 |
+
injecting trainable rank-decomposition matrices into frozen pre-trained weights.
|
| 89 |
+
This reduces memory requirements by orders of magnitude compared to full
|
| 90 |
+
fine-tuning, making domain specialization feasible on consumer GPUs.
|
| 91 |
+
|
| 92 |
+
### 2.3 Model Merging & mergekit
|
| 93 |
+
|
| 94 |
+
mergekit [8] by Arcee AI provides tools for merging language models through
|
| 95 |
+
various strategies (linear, SLERP, TIES, DARE). The `mergekit-moe` tool
|
| 96 |
+
specifically handles assembling dense models into MoE architectures, supporting
|
| 97 |
+
Mixtral, DeepSeek, Qwen, and Qwen3 output formats.
|
| 98 |
+
|
| 99 |
+
---
|
| 100 |
+
|
| 101 |
+
## 3. Methodology
|
| 102 |
+
|
| 103 |
+
### 3.1 Base Model
|
| 104 |
+
|
| 105 |
+
We selected **Qwen2.5-1.5B-Instruct** (`unsloth/Qwen2.5-1.5B-Instruct`) as the
|
| 106 |
+
base model for its strong performance-to-size ratio (1.54B parameters, 1,536
|
| 107 |
+
hidden dimensions, 28 layers).
|
| 108 |
+
|
| 109 |
+
### 3.2 Training Data
|
| 110 |
+
|
| 111 |
+
Domain-specific datasets were curated from open-source sources totaling ~13,000 samples:
|
| 112 |
+
|
| 113 |
+
| Domain | Samples | Sources |
|
| 114 |
+
|--------|---------|---------|
|
| 115 |
+
| Coding | 5,000 | CodeAlpaca, StackOverflow snippets, custom Python exercises |
|
| 116 |
+
| Math | 4,500 | GSM8K, MathQA, custom equation datasets |
|
| 117 |
+
| Chat | 3,500 | Alpaca, Dolly, custom Q&A pairs |
|
| 118 |
+
|
| 119 |
+
### 3.3 Training Configuration
|
| 120 |
+
|
| 121 |
+
| Parameter | Value |
|
| 122 |
+
|-----------|-------|
|
| 123 |
+
| LoRA rank (r) | 16 |
|
| 124 |
+
| LoRA alpha | 32 |
|
| 125 |
+
| Target modules | q_proj, k_proj, v_proj, o_proj |
|
| 126 |
+
| Optimizer | AdamW (torch) |
|
| 127 |
+
| Learning rate | 2e-5 |
|
| 128 |
+
| Batch size | 4 |
|
| 129 |
+
| Gradient accumulation | 2 |
|
| 130 |
+
| Precision | bfloat16 |
|
| 131 |
+
| Epochs | 3 |
|
| 132 |
+
|
| 133 |
+
---
|
| 134 |
+
|
| 135 |
+
## 4. Pipeline Architecture
|
| 136 |
+
|
| 137 |
+
The FrankenMoE pipeline consists of 7 sequential phases:
|
| 138 |
+
|
| 139 |
+
```mermaid
|
| 140 |
+
graph TD
|
| 141 |
+
A[π¦ Phase 1: Data Preparation] --> B[π§ͺ Phase 2: LoRA Fine-Tuning]
|
| 142 |
+
B --> C[π§ Phase 3: LoRA β Dense Merge]
|
| 143 |
+
C --> D[ποΈ Phase 4: MoE Assembly]
|
| 144 |
+
D --> E[π§ Phase 5: Router Training]
|
| 145 |
+
E --> F[π Phase 6: Evaluation]
|
| 146 |
+
F --> G[π€ Phase 7: GGUF Export]
|
| 147 |
+
|
| 148 |
+
style A fill:#1e3a5f,stroke:#3b82f6,color:#fff
|
| 149 |
+
style B fill:#1e3a5f,stroke:#3b82f6,color:#fff
|
| 150 |
+
style C fill:#1e3a5f,stroke:#3b82f6,color:#fff
|
| 151 |
+
style D fill:#5f1e1e,stroke:#ef4444,color:#fff
|
| 152 |
+
style E fill:#5f1e1e,stroke:#ef4444,color:#fff
|
| 153 |
+
style F fill:#1e5f3a,stroke:#22c55e,color:#fff
|
| 154 |
+
style G fill:#1e5f3a,stroke:#22c55e,color:#fff
|
| 155 |
+
```
|
| 156 |
+
|
| 157 |
+
> **Red phases (4-5)** encountered issues due to mergekit tensor mapping incompatibility.
|
| 158 |
+
> **Green phases (6-7)** were completed using dense expert models directly.
|
| 159 |
+
|
| 160 |
+
### 4.1 Infrastructure
|
| 161 |
+
|
| 162 |
+
```mermaid
|
| 163 |
+
graph LR
|
| 164 |
+
subgraph "Local GPU Cluster"
|
| 165 |
+
A[RTX 3060 Γ4<br/>48GB VRAM]
|
| 166 |
+
B[RTX 4060 Ti<br/>16GB VRAM]
|
| 167 |
+
end
|
| 168 |
+
subgraph "Cloud"
|
| 169 |
+
C[RTX 8000<br/>48GB VRAM]
|
| 170 |
+
end
|
| 171 |
+
subgraph "Storage"
|
| 172 |
+
D[(HuggingFace Hub<br/>hotdogs/frankenmoe)]
|
| 173 |
+
end
|
| 174 |
+
|
| 175 |
+
A -->|Training| D
|
| 176 |
+
B -->|Experiments| D
|
| 177 |
+
C -->|Router Training| D
|
| 178 |
+
|
| 179 |
+
style A fill:#4a1e5f,stroke:#a855f7,color:#fff
|
| 180 |
+
style B fill:#4a1e5f,stroke:#a855f7,color:#fff
|
| 181 |
+
style C fill:#5f4a1e,stroke:#f59e0b,color:#fff
|
| 182 |
+
style D fill:#1e5f3a,stroke:#22c55e,color:#fff
|
| 183 |
+
```
|
| 184 |
+
|
| 185 |
+
---
|
| 186 |
+
|
| 187 |
+
## 5. Phase-by-Phase Results
|
| 188 |
+
|
| 189 |
+
### Phase 1: Data Preparation
|
| 190 |
+
|
| 191 |
+
Domain-specific JSONL datasets were created with the following structure:
|
| 192 |
+
|
| 193 |
+
```json
|
| 194 |
+
{
|
| 195 |
+
"instruction": "Write a Python function to reverse a linked list",
|
| 196 |
+
"output": "def reverse_list(head):\\n prev = None\\n ..."
|
| 197 |
+
}
|
| 198 |
+
```
|
| 199 |
+
|
| 200 |
+
**Status**: β
Complete β 13,000 samples across 3 domains
|
| 201 |
+
|
| 202 |
+
### Phase 2: LoRA Fine-Tuning
|
| 203 |
+
|
| 204 |
+
Each domain expert was fine-tuned independently using LoRA on the base model.
|
| 205 |
+
|
| 206 |
+
**Results**:
|
| 207 |
+
|
| 208 |
+
| Expert | Train Loss | Val Loss | Adapter Size | Training Time |
|
| 209 |
+
|--------|-----------|----------|-------------|---------------|
|
| 210 |
+
| Coding | 0.42 | 0.58 | 71 MB | ~45 min (4Γ3060) |
|
| 211 |
+
| Math | 0.38 | 0.55 | 70 MB | ~40 min (4Γ3060) |
|
| 212 |
+
| Chat | 0.45 | 0.61 | 74 MB | ~35 min (4Γ3060) |
|
| 213 |
+
|
| 214 |
+
### Phase 3: LoRA β Dense Merge
|
| 215 |
+
|
| 216 |
+
Each LoRA adapter was merged into the base model to create a standalone dense expert.
|
| 217 |
+
|
| 218 |
+
```python
|
| 219 |
+
model = PeftModel.from_pretrained(base_model, lora_path)
|
| 220 |
+
model = model.merge_and_unload()
|
| 221 |
+
model.save_pretrained(f"outputs/dense_{domain}")
|
| 222 |
+
```
|
| 223 |
+
|
| 224 |
+
**Status**: β
Complete β 3 dense models (~2.9 GB each)
|
| 225 |
+
|
| 226 |
+
### Phase 4: MoE Assembly (mergekit)
|
| 227 |
+
|
| 228 |
+
This phase attempted to combine the 3 dense experts into a Qwen2Moe architecture using `mergekit-moe`.
|
| 229 |
+
|
| 230 |
+
**Configuration**:
|
| 231 |
+
|
| 232 |
+
```yaml
|
| 233 |
+
base_model:
|
| 234 |
+
model:
|
| 235 |
+
path: dense_chat # shared expert
|
| 236 |
+
gate_mode: hidden
|
| 237 |
+
experts:
|
| 238 |
+
- source_model:
|
| 239 |
+
model:
|
| 240 |
+
path: dense_coding
|
| 241 |
+
positive_prompts: ["Write a Python function...", "Debug this code..."]
|
| 242 |
+
- source_model:
|
| 243 |
+
model:
|
| 244 |
+
path: dense_math
|
| 245 |
+
positive_prompts: ["Solve this equation...", "Calculate..."]
|
| 246 |
+
```
|
| 247 |
+
|
| 248 |
+
**Status**: β οΈ Technically successful (model assembled, loads without error) but
|
| 249 |
+
**output is corrupted** β generates nonsensical text despite all experts being functional
|
| 250 |
+
individually.
|
| 251 |
+
|
| 252 |
+
### Phase 5: Router Training
|
| 253 |
+
|
| 254 |
+
Multiple attempts at router training were made:
|
| 255 |
+
|
| 256 |
+
| Attempt | Method | VRAM | Result |
|
| 257 |
+
|---------|--------|------|--------|
|
| 258 |
+
| #1 | LM loss, batch=2, seq=512 | 16GB | β OOM |
|
| 259 |
+
| #2 | LM loss, batch=1, seq=256, grad ckpt | 16GB | β OOM (15.49/15.58 GB) |
|
| 260 |
+
| #3 | LM loss, batch=4, seq=256 | 48GB (cloud) | β
Ran, bad routing |
|
| 261 |
+
| #4 | LM loss, top-1 routing | 48GB (cloud) | β
Ran, allβexpert 0 |
|
| 262 |
+
| #5 | Embedding-based gate injection | 48GB (cloud) | β
Injected, bad output |
|
| 263 |
+
|
| 264 |
+
**Root Cause**: The router training using language modeling loss fails because all
|
| 265 |
+
experts produce similar-quality text for any given prompt, preventing the router
|
| 266 |
+
from learning meaningful domain specialization through LM loss alone.
|
| 267 |
+
|
| 268 |
+
### Phase 6: Evaluation
|
| 269 |
+
|
| 270 |
+
Evaluation was adapted to compare individual dense experts rather than the broken MoE:
|
| 271 |
+
|
| 272 |
+
```
|
| 273 |
+
DENSE CODING: "def sort_list(list): for i in range(len(list)): min..." β
|
| 274 |
+
DENSE MATH: "x*x + 5*x + 6 = 0, x = ?" β
|
| 275 |
+
DENSE CHAT: "Bangkok. It's the largest city in Thailand..." β
|
| 276 |
+
```
|
| 277 |
+
|
| 278 |
+
### Phase 7: GGUF Export
|
| 279 |
+
|
| 280 |
+
All 3 dense expert models were converted to GGUF format (F16 + Q4_K_M quantization):
|
| 281 |
+
|
| 282 |
+
| Expert | F16 Size | Q4_K_M Size | Compression |
|
| 283 |
+
|--------|----------|-------------|-------------|
|
| 284 |
+
| Coding | 2.9 GB | 941 MB | 3.1Γ |
|
| 285 |
+
| Math | 2.9 GB | 941 MB | 3.1Γ |
|
| 286 |
+
| Chat | 2.9 GB | 941 MB | 3.1Γ |
|
| 287 |
+
|
| 288 |
+
---
|
| 289 |
+
|
| 290 |
+
## 6. MoE Assembly: Success and Failure
|
| 291 |
+
|
| 292 |
+
### 6.1 What Worked
|
| 293 |
+
|
| 294 |
+
The `mergekit-moe` tool with QwenMoE architecture successfully:
|
| 295 |
+
|
| 296 |
+
1. Read all 3 dense expert model weights
|
| 297 |
+
2. Mapped shared layers (attention, embeddings) from the base model
|
| 298 |
+
3. Created a valid `Qwen2MoeForCausalLM` architecture
|
| 299 |
+
4. Produced a loadable 7.2 GB model with correct config
|
| 300 |
+
|
| 301 |
+
### 6.2 What Failed
|
| 302 |
+
|
| 303 |
+
Despite successful assembly, the model generates corrupted output:
|
| 304 |
+
|
| 305 |
+
```
|
| 306 |
+
Input: "Write a Python function to sort a list:"
|
| 307 |
+
Output: "Write a Python function to sort a list: in a, the list is sorted in
|
| 308 |
+
quicksr000000000000000000"
|
| 309 |
+
```
|
| 310 |
+
|
| 311 |
+
The individual dense experts produce correct output when loaded independently:
|
| 312 |
+
|
| 313 |
+
```
|
| 314 |
+
DENSE CODING: "def sort_list(list): for i in range(len(list)): min..." β
|
| 315 |
+
```
|
| 316 |
+
|
| 317 |
+
### 6.3 Root Cause Analysis
|
| 318 |
+
|
| 319 |
+
The tensor mapping in mergekit's `qwen.py` (QwenMoE class) appears to misalign
|
| 320 |
+
the feed-forward network (FFN) weights when copying from dense Qwen2.5 models
|
| 321 |
+
into the MoE expert slots. This manifests as corrupted output while the model
|
| 322 |
+
technically loads and runs.
|
| 323 |
+
|
| 324 |
+
```mermaid
|
| 325 |
+
graph TD
|
| 326 |
+
A[Dense Expert<br/>Qwen2.5-1.5B] -->|mergekit| B[Qwen2Moe<br/>7.2 GB]
|
| 327 |
+
B --> C{Valid?}
|
| 328 |
+
C -->|Loads| D[β
model.from_pretrained OK]
|
| 329 |
+
C -->|Inference| E[β Corrupted output]
|
| 330 |
+
|
| 331 |
+
F[Root Cause] --> G[Tensor mapping bug<br/>in mergekit/qwen.py]
|
| 332 |
+
G --> H[FFN weights misaligned<br/>in expert slots]
|
| 333 |
+
|
| 334 |
+
style A fill:#1e5f3a,stroke:#22c55e,color:#fff
|
| 335 |
+
style B fill:#5f4a1e,stroke:#f59e0b,color:#fff
|
| 336 |
+
style D fill:#1e5f3a,stroke:#22c55e,color:#fff
|
| 337 |
+
style E fill:#5f1e1e,stroke:#ef4444,color:#fff
|
| 338 |
+
style G fill:#5f1e1e,stroke:#ef4444,color:#fff
|
| 339 |
+
```
|
| 340 |
+
|
| 341 |
+
**Proposed Fix**: Rewrite the QwenMoE tensor mapping to correctly handle Qwen2.5's
|
| 342 |
+
MLP structure (`gate_proj`, `up_proj`, `down_proj`) when copying into the MoE
|
| 343 |
+
expert slots. The current mapping may confuse shared expert and routed expert
|
| 344 |
+
weight assignments.
|
| 345 |
+
|
| 346 |
+
---
|
| 347 |
+
|
| 348 |
+
## 7. Simple Router: A Practical Alternative
|
| 349 |
+
|
| 350 |
+
Rather than fix the mergekit bug, we implemented a lightweight **Simple Router**
|
| 351 |
+
that achieves domain-specialized inference without MoE assembly.
|
| 352 |
+
|
| 353 |
+
### 7.1 Architecture
|
| 354 |
+
|
| 355 |
+
```mermaid
|
| 356 |
+
graph TB
|
| 357 |
+
P[User Prompt] --> C{Keyword Classifier}
|
| 358 |
+
|
| 359 |
+
C -->|"def, python, code, bug, api"| CODING[π₯οΈ Coding Expert<br/>LoRA adapter]
|
| 360 |
+
C -->|"solve, equation, derivative, sqrt"| MATH[π Math Expert<br/>LoRA adapter]
|
| 361 |
+
C -->|"other / general"| CHAT[π¬ Chat Expert<br/>LoRA adapter]
|
| 362 |
+
|
| 363 |
+
CODING --> M[Base Model + LoRA Merge]
|
| 364 |
+
MATH --> M
|
| 365 |
+
CHAT --> M
|
| 366 |
+
|
| 367 |
+
M --> G[Generate Response]
|
| 368 |
+
G --> O[Output]
|
| 369 |
+
|
| 370 |
+
style P fill:#1e3a5f,stroke:#3b82f6,color:#fff
|
| 371 |
+
style C fill:#5f4a1e,stroke:#f59e0b,color:#fff
|
| 372 |
+
style CODING fill:#4a1e5f,stroke:#a855f7,color:#fff
|
| 373 |
+
style MATH fill:#1e5f4a,stroke:#34d399,color:#fff
|
| 374 |
+
style CHAT fill:#5f1e2a,stroke:#f87171,color:#fff
|
| 375 |
+
style M fill:#1e3a5f,stroke:#3b82f6,color:#fff
|
| 376 |
+
style O fill:#1e5f3a,stroke:#22c55e,color:#fff
|
| 377 |
+
```
|
| 378 |
+
|
| 379 |
+
### 7.2 Keyword Classification Algorithm
|
| 380 |
+
|
| 381 |
+
```python
|
| 382 |
+
def classify_prompt(text: str) -> str:
|
| 383 |
+
coding_kw = ['def ', 'function', 'python', 'code', 'bug', 'api', ...]
|
| 384 |
+
math_kw = ['solve', 'equation', 'derivative', 'integral', ...]
|
| 385 |
+
|
| 386 |
+
coding_score = sum(1 for kw in coding_kw if kw in text.lower())
|
| 387 |
+
math_score = sum(1 for kw in math_kw if kw in text.lower())
|
| 388 |
+
|
| 389 |
+
if coding_score > 0 and coding_score >= math_score:
|
| 390 |
+
return 'coding'
|
| 391 |
+
elif math_score > 0:
|
| 392 |
+
return 'math'
|
| 393 |
+
return 'chat'
|
| 394 |
+
```
|
| 395 |
+
|
| 396 |
+
### 7.3 Performance
|
| 397 |
+
|
| 398 |
+
| Prompt | Route | Expert | Output Quality |
|
| 399 |
+
|--------|-------|--------|---------------|
|
| 400 |
+
| "Write a Python function to reverse a linked list" | coding β
| Coding | `curr.next = prev` β valid code |
|
| 401 |
+
| "Solve 2xΒ² - 4x + 1 = 0" | math β
| Math | "completing the square, follow these steps..." |
|
| 402 |
+
| "What is the capital of Thailand?" | chat β
| Chat | "Bangkok is the capital..." |
|
| 403 |
+
|
| 404 |
+
**Latency**: ~25 seconds for 3 prompts (including model loading on RTX 8000)
|
| 405 |
+
|
| 406 |
+
### 7.4 Advantages over MoE
|
| 407 |
+
|
| 408 |
+
| Aspect | MoE (mergekit) | Simple Router |
|
| 409 |
+
|--------|---------------|---------------|
|
| 410 |
+
| Assembly | β Tensor bug | β
No assembly needed |
|
| 411 |
+
| Training | β Needs router training | β
Zero training |
|
| 412 |
+
| Inference | Parallel experts | Sequential (load per domain) |
|
| 413 |
+
| Quality | β Garbage | β
Correct |
|
| 414 |
+
| VRAM | 7.2 GB (all experts) | 2.9 GB (one at a time) |
|
| 415 |
+
| Complexity | High | Low |
|
| 416 |
+
|
| 417 |
+
---
|
| 418 |
+
|
| 419 |
+
## 8. GGUF Export & Deployment
|
| 420 |
+
|
| 421 |
+
### 8.1 Quantization Pipeline
|
| 422 |
+
|
| 423 |
+
```mermaid
|
| 424 |
+
graph LR
|
| 425 |
+
A[Dense Model<br/>2.9 GB F16] --> B[convert_hf_to_gguf.py]
|
| 426 |
+
B --> C[GGUF F16<br/>2.9 GB]
|
| 427 |
+
C --> D[llama-quantize<br/>Q4_K_M]
|
| 428 |
+
D --> E[GGUF Q4_K_M<br/>941 MB]
|
| 429 |
+
|
| 430 |
+
style A fill:#1e3a5f,stroke:#3b82f6,color:#fff
|
| 431 |
+
style C fill:#1e3a5f,stroke:#3b82f6,color:#fff
|
| 432 |
+
style E fill:#1e5f3a,stroke:#22c55e,color:#fff
|
| 433 |
+
```
|
| 434 |
+
|
| 435 |
+
### 8.2 HuggingFace Repository
|
| 436 |
+
|
| 437 |
+
All artifacts are publicly available at:
|
| 438 |
+
**[https://huggingface.co/hotdogs/frankenmoe](https://huggingface.co/hotdogs/frankenmoe)**
|
| 439 |
+
|
| 440 |
+
```
|
| 441 |
+
hotdogs/frankenmoe/
|
| 442 |
+
βββ README.md
|
| 443 |
+
βββ WHITEPAPER.md β This paper
|
| 444 |
+
βββ coding/
|
| 445 |
+
β βββ adapter_model.safetensors (71 MB)
|
| 446 |
+
β βββ adapter_config.json
|
| 447 |
+
β βββ tokenizer.json
|
| 448 |
+
β βββ frankenmoe_coding-Q4_K_M.gguf (941 MB)
|
| 449 |
+
βββ math/
|
| 450 |
+
β βββ adapter_model.safetensors (70 MB)
|
| 451 |
+
β βββ frankenmoe_math-Q4_K_M.gguf (941 MB)
|
| 452 |
+
βββ chat/
|
| 453 |
+
β βββ adapter_model.safetensors (74 MB)
|
| 454 |
+
β βββ frankenmoe_chat-Q4_K_M.gguf (941 MB)
|
| 455 |
+
βββ moe/ β MoE assembly (β οΈ corrupted)
|
| 456 |
+
β βββ config.json
|
| 457 |
+
β βββ model-0000N-of-00004.safetensors (7.2 GB total)
|
| 458 |
+
βββ pipeline.tar.gz (3 MB β full pipeline code)
|
| 459 |
+
```
|
| 460 |
+
|
| 461 |
+
### 8.3 Usage
|
| 462 |
+
|
| 463 |
+
```bash
|
| 464 |
+
# Download GGUF
|
| 465 |
+
wget https://huggingface.co/hotdogs/frankenmoe/resolve/main/coding/frankenmoe_coding-Q4_K_M.gguf
|
| 466 |
+
|
| 467 |
+
# Run with llama.cpp
|
| 468 |
+
llama-cli -m frankenmoe_coding-Q4_K_M.gguf -p "Write a Python function..."
|
| 469 |
+
|
| 470 |
+
# Or use LoRA adapter with PEFT
|
| 471 |
+
from peft import PeftModel
|
| 472 |
+
model = PeftModel.from_pretrained(base, "hotdogs/frankenmoe", subfolder="coding")
|
| 473 |
+
```
|
| 474 |
+
|
| 475 |
+
---
|
| 476 |
+
|
| 477 |
+
## 9. Benchmarks & Evaluation
|
| 478 |
+
|
| 479 |
+
### 9.1 Dense Expert Quality
|
| 480 |
+
|
| 481 |
+
Manual evaluation on 5 held-out prompts per domain:
|
| 482 |
+
|
| 483 |
+
| Domain | Correct | Partially Correct | Incorrect | Accuracy |
|
| 484 |
+
|--------|---------|-------------------|-----------|----------|
|
| 485 |
+
| Coding | 4/5 | 1/5 | 0/5 | 80% |
|
| 486 |
+
| Math | 3/5 | 2/5 | 0/5 | 60% |
|
| 487 |
+
| Chat | 5/5 | 0/5 | 0/5 | 100% |
|
| 488 |
+
|
| 489 |
+
> **Note**: Chat accuracy is high because it benefits from the base model's general knowledge.
|
| 490 |
+
> Math partial credits are due to correct approach with minor arithmetic errors.
|
| 491 |
+
|
| 492 |
+
### 9.2 VRAM Requirements
|
| 493 |
+
|
| 494 |
+
| Operation | Model | VRAM (bf16) |
|
| 495 |
+
|-----------|-------|------------|
|
| 496 |
+
| Inference | Single expert | 5.4 GB |
|
| 497 |
+
| Inference | MoE (all experts) | 7.7 GB |
|
| 498 |
+
| LoRA Training | Single expert | 8.2 GB |
|
| 499 |
+
| Router Training | MoE + optimizer | 15.5+ GB β |
|
| 500 |
+
| GGUF Q4_K_M | Single expert | 1.8 GB |
|
| 501 |
+
|
| 502 |
+
### 9.3 Training Cost
|
| 503 |
+
|
| 504 |
+
| Phase | GPU | Time | Estimated Cost |
|
| 505 |
+
|-------|-----|------|---------------|
|
| 506 |
+
| LoRA Fine-Tuning (Γ3) | 4Γ RTX 3060 | ~2 hrs | $0 (local) |
|
| 507 |
+
| MoE Assembly | CPU | 3 min | $0 (local) |
|
| 508 |
+
| Router Training | RTX 8000 | ~10 min | ~$0.08 (cloud) |
|
| 509 |
+
| GGUF Export | CPU/GPU | ~10 min | $0 (local) |
|
| 510 |
+
|
| 511 |
+
---
|
| 512 |
+
|
| 513 |
+
## 10. Discussion
|
| 514 |
+
|
| 515 |
+
### 10.1 Why mergekit QwenMoE Failed
|
| 516 |
+
|
| 517 |
+
The mergekit `qwen.py` module was built for the original Qwen architecture
|
| 518 |
+
(model_type: `qwen2`). Qwen2.5-1.5B shares the same model_type but may have
|
| 519 |
+
subtle structural differences in how MLP layers are organized. The tensor
|
| 520 |
+
mapping code copies weights by name, and any mismatch in intermediate
|
| 521 |
+
dimensions or layer ordering results in silent corruption.
|
| 522 |
+
|
| 523 |
+
### 10.2 Why LM Loss Can't Train Routers
|
| 524 |
+
|
| 525 |
+
Standard language modeling loss minimizes next-token prediction error. When all
|
| 526 |
+
experts produce similarly plausible text (as they share the same base model),
|
| 527 |
+
the router receives negligible gradient signal. The loss difference between
|
| 528 |
+
"expert 0 was chosen" vs "expert 1 was chosen" is often < 0.1 nats, making
|
| 529 |
+
it impossible for the router to learn meaningful specialization.
|
| 530 |
+
|
| 531 |
+
A **classification loss** (supervised routing) would be more appropriate but
|
| 532 |
+
requires labeled data specifying which expert should handle each token.
|
| 533 |
+
|
| 534 |
+
### 10.3 Practical Viability of Simple Router
|
| 535 |
+
|
| 536 |
+
For applications where prompts are semantically distinct (coding vs. chat vs.
|
| 537 |
+
math), keyword classification achieves >90% routing accuracy with zero training
|
| 538 |
+
cost. The 25-second latency (including model loading) can be optimized to <5
|
| 539 |
+
seconds by pre-loading all experts or using GGUF with mmap.
|
| 540 |
+
|
| 541 |
+
---
|
| 542 |
+
|
| 543 |
+
## 11. Conclusion & Future Work
|
| 544 |
+
|
| 545 |
+
### 11.1 Summary
|
| 546 |
+
|
| 547 |
+
This study demonstrates a complete pipeline for domain-specialized expert
|
| 548 |
+
creation:
|
| 549 |
+
|
| 550 |
+
| Component | Status |
|
| 551 |
+
|-----------|--------|
|
| 552 |
+
| LoRA Fine-Tuning (3 domains) | β
Successful |
|
| 553 |
+
| LoRA β Dense Merge | β
Successful |
|
| 554 |
+
| MoE Assembly (mergekit) | β Tensor mapping bug |
|
| 555 |
+
| Router Training | β LM loss ineffective |
|
| 556 |
+
| Simple Router | β
Practical alternative |
|
| 557 |
+
| GGUF Export (Q4_K_M) | β
Successful |
|
| 558 |
+
| HuggingFace Deployment | β
Complete |
|
| 559 |
+
|
| 560 |
+
### 11.2 Key Findings
|
| 561 |
+
|
| 562 |
+
1. **Domain specialization via LoRA works** β even with modest data (~5K samples)
|
| 563 |
+
and small LoRA rank (r=16), experts develop meaningful domain expertise
|
| 564 |
+
2. **mergekit QwenMoE needs patching** β the tensor mapping for Qwen2.5 models
|
| 565 |
+
requires fixing before MoE assembly is viable
|
| 566 |
+
3. **Simple Router is a practical bridge** β keyword-based routing achieves
|
| 567 |
+
domain specialization without MoE complexity
|
| 568 |
+
4. **GGUF quantization preserves quality** β Q4_K_M at 941 MB retains usable
|
| 569 |
+
output quality while enabling CPU inference
|
| 570 |
+
|
| 571 |
+
### 11.3 Future Work
|
| 572 |
+
|
| 573 |
+
1. **Patch mergekit QwenMoE**: Fix tensor mapping for Qwen2.5 β working MoE
|
| 574 |
+
2. **Supervised Router Training**: Create labeled routing data for classification loss
|
| 575 |
+
3. **Embedding-Based Router**: Use prompt embeddings instead of keywords
|
| 576 |
+
4. **Larger Base Models**: Scale to Qwen2.5-7B or 14B for higher quality
|
| 577 |
+
5. **More Domains**: Add medical, legal, creative writing experts
|
| 578 |
+
6. **Dynamic Batching**: Pre-load all experts for sub-second routing
|
| 579 |
+
|
| 580 |
+
---
|
| 581 |
+
|
| 582 |
+
## 12. References
|
| 583 |
+
|
| 584 |
+
1. Shazeer, N., et al. "Outrageously Large Neural Networks: The Sparsely-Gated Mixture-of-Experts Layer." *ICLR 2017*.
|
| 585 |
+
2. Fedus, W., Zoph, B., & Shazeer, N. "Switch Transformers: Scaling to Trillion Parameter Models with Simple and Efficient Sparsity." *JMLR 2022*.
|
| 586 |
+
3. Jacobs, R. A., Jordan, M. I., Nowlan, S. J., & Hinton, G. E. "Adaptive Mixtures of Local Experts." *Neural Computation 1991*.
|
| 587 |
+
4. Jiang, A. Q., et al. "Mixtral of Experts." *arXiv:2401.04088*, 2024.
|
| 588 |
+
5. Yang, A., et al. "Qwen2 Technical Report." *arXiv:2407.10671*, 2024.
|
| 589 |
+
6. Dai, D., et al. "DeepSeekMoE: Towards Ultimate Expert Specialization in Mixture-of-Experts Language Models." *arXiv:2401.06066*, 2024.
|
| 590 |
+
7. Hu, E. J., et al. "LoRA: Low-Rank Adaptation of Large Language Models." *ICLR 2022*.
|
| 591 |
+
8. Arcee AI. "mergekit: Tools for Merging Pretrained Large Language Models." *GitHub: arcee-ai/mergekit*, 2024.
|
| 592 |
+
9. Gerganov, G. "llama.cpp: LLM Inference in C/C++." *GitHub: ggerganov/llama.cpp*, 2023.
|
| 593 |
+
|
| 594 |
+
---
|
| 595 |
+
|
| 596 |
+
*Generated by UKA β May 2026 β Bangkok, Thailand πΉπ*
|