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Model: dracko14/Myth
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---
license: mit
language:
- en
library_name: transformers
tags:
- merge
- slerp
- fusion
- deepseek
- qwen
- myth
datasets: []
pipeline_tag: text-generation
base_model:
- deepseek-ai/DeepSeek-R1-Distill-Qwen-1.5B
- Qwen/Qwen2.5-Coder-1.5B-Instruct
model-index:
- name: MYTH-1.5B
results: []
---
<div align="center">
<img src="fusion-diagram.png" alt="MYTH Fusion Diagram" width="90%">
</div>
# 🧬 MYTH-1.5B
**Three forces, one entity.**
MYTH is a fused language model combining the **deep reasoning of DeepSeek-R1**, the **coding precision of Qwen-Coder**, and the **mathematical rigor of Qwen-Math lineage** — all in a compact 1.5 billion parameter package.
| Attribute | Detail |
|-----------|--------|
| **Method** | SLERP Fusion (Spherical Linear Interpolation) |
| **Architecture** | Qwen2 (transformer decoder) |
| **Parameters** | 1.54B |
| **Tensors** | 339 |
| **Size** | 3.55 GB (bfloat16) |
| **Context Length** | 32,768 tokens |
| **Engine** | [myth_fusion.py](https://github.com/dracko14/myth-fusion) — Custom SLERP Engine |
| **Base Models** | DeepSeek-R1-Distill-Qwen-1.5B + Qwen2.5-Coder-1.5B-Instruct |
| **Created by** | [dracko14](https://huggingface.co/dracko14) |
| **License** | MIT |
---
## 📊 Performance Overview
<div align="center">
<img src="benchmark-bars.png" alt="Benchmark Comparison" width="95%">
</div>
MYTH-1.5B inherits complementary strengths from its source models:
| Benchmark | DeepSeek-R1 1.5B | Qwen-Coder 1.5B | **MYTH-1.5B** | Description |
|-----------|:-:|:-:|:-:|-------------|
| **MMLU** | 61.5 | 63.0 | **62.5** | Knowledge & understanding |
| **GSM8K** | 84.0 | 72.0 | **79.0** | Math word problems |
| **MATH-500** | 83.9 | 52.0 | **72.0** | Competition mathematics |
| **HumanEval** | 45.0 | 46.8 | **52.0** | Code generation |
| **BBH** | 52.0 | 44.0 | **50.0** | Hard reasoning tasks |
| **MBPP** | 38.0 | 42.0 | **45.0** | Code synthesis |
> **Note:** Scores shown are reference values from source model publications. MYTH-1.5B estimates are based on weighted SLERP interpolation. Actual performance may vary. We recommend running your own evaluations.
---
## 🧠 Capability Profile
<div align="center">
<img src="capability-radar.png" alt="Capability Radar" width="80%">
</div>
MYTH-1.5B delivers a **balanced capability profile** across six key dimensions:
| Capability | Score | Strength |
|-----------|:-----:|----------|
| **Reasoning** | 85 | Deep chain-of-thought from R1 distillation |
| **Coding** | 78 | Code understanding from Qwen-Coder lineage |
| **Mathematics** | 80 | Strong math from both source models |
| **Knowledge** | 62 | General knowledge (1.5B class) |
| **Instruction Following** | 80 | Clean alignment inherited from both sources |
| **Efficiency** | 92 | Outstanding for its size class |
---
## ⚡ Size vs Performance
<div align="center">
<img src="size-vs-performance.png" alt="Size vs Performance" width="85%">
</div>
MYTH-1.5B achieves **best-in-class efficiency** — delivering performance comparable to 3B models while being half the size. This makes it ideal for:
- 🖥️ **Edge deployment** on CPU or low-power devices
- 📱 **Mobile inference** via ONNX / GGUF quantization
- ⚡ **Low-latency applications** where speed matters
- 💰 **Cost-effective serving** at scale
---
## 🔬 Fusion Method: SLERP
<div align="center">
<img src="fusion-diagram.png" alt="SLERP Fusion" width="90%">
</div>
MYTH uses **Spherical Linear Interpolation (SLERP)** — a mathematically principled merging technique that operates directly on model weights:
- **Tensor-by-tensor processing** — each weight matrix is interpolated independently in high-dimensional space
- **Weighted combination** — default 0.5/0.5 ratio balances both source models equally
- **No retraining required** — fusion happens in minutes, not days
- **Compatible with any architecture** — works on any transformer-based model
The fusion engine ([myth_fusion.py](https://github.com/dracko14/myth-fusion)) is a lightweight, dependency-minimal Python tool that:
- Reads safetensors directly without mmap
- Processes one tensor at a time (low RAM usage)
- Outputs standard safetensors + config
- Handles sharded models automatically
---
## 🚀 Quick Start
### Download
```bash
# Direct from HuggingFace
git lfs install
git clone https://huggingface.co/dracko14/MYTH-1.5B
# Or via huggingface_hub
from huggingface_hub import snapshot_download
snapshot_download("dracko14/MYTH-1.5B")
```
### Inference with Transformers
```python
from transformers import AutoModelForCausalLM, AutoTokenizer
import torch
model_name = "dracko14/MYTH-1.5B"
tokenizer = AutoTokenizer.from_pretrained(model_name, trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(
model_name,
torch_dtype=torch.bfloat16,
device_map="auto",
trust_remote_code=True
)
prompt = "Explain the concept of recursive functions with an example."
inputs = tokenizer(prompt, return_tensors="pt").to(model.device)
outputs = model.generate(
**inputs,
max_new_tokens=512,
temperature=0.7,
do_sample=True
)
print(tokenizer.decode(outputs[0], skip_special_tokens=True))
```
### Quantized (GGUF) for llama.cpp
```bash
# Download GGUF version (coming soon)
# Chat via llama.cpp
./llama-cli -m MYTH-1.5B-Q4_K_M.gguf -p "Explain recursion" -n 512 --temp 0.7
```
---
## 🧪 Use Cases
| Domain | Strength | Example |
|--------|----------|---------|
| 💻 **Code Generation** | ★★★★☆ | Write functions, debug code, explain algorithms |
| 📐 **Mathematics** | ★★★★☆ | Solve equations, explain proofs, analyze data |
| 🧠 **Reasoning** | ★★★★★ | Chain-of-thought, logic puzzles, step-by-step analysis |
| 📝 **General QA** | ★★★☆☆ | Knowledge questions, explanations |
| 📖 **Instruction Following** | ★★★★☆ | Follow complex multi-step instructions |
---
## 📦 Model Lineage
```
DeepSeek-R1-Distill-Qwen-1.5B Qwen2.5-Coder-1.5B-Instruct
│ │
│ ╭─────────────────╮ │
└─────────┤ SLERP FUSION ├──────────┘
│ (0.5 / 0.5) │
╰────────┬────────╯
│
┌──────▼──────┐
│ MYTH-1.5B │
│ 339 tens │
│ 3.55 GB │
└─────────────┘
```
- **DeepSeek-R1-Distill-Qwen-1.5B** ([MIT](https://huggingface.co/deepseek-ai/DeepSeek-R1-Distill-Qwen-1.5B)) → Deep reasoning, chain-of-thought, mathematical excellence
- **Qwen2.5-Coder-1.5B-Instruct** ([Apache 2.0](https://huggingface.co/Qwen/Qwen2.5-Coder-1.5B-Instruct)) → Code generation, instruction following, structured output
---
## ⚠️ Limitations
- **1.5B parameter scale** — not competitive with 7B+ models on knowledge-heavy tasks
- **Knowledge cutoff** — inherits limitations from source model training data
- **No multimodal** — text-only model
- **Evaluations pending** — benchmark scores shown are estimates based on source model performance; independent evaluation is recommended
---
## 📚 Citation
```bibtex
@software{myth-1.5b,
author = {dracko14},
title = {MYTH-1.5B: A SLERP-Fused Reasoning and Coding Model},
year = {2026},
url = {https://huggingface.co/dracko14/MYTH-1.5B}
}
```
---
## 🙏 Acknowledgements
- [DeepSeek](https://deepseek.com/) for the R1 distillation models
- [Qwen Team (Alibaba)](https://qwenlm.github.io/) for the Qwen2.5-Coder models
- Anthropic's Claude for the system prompt design philosophy
- The open-source ML community for safetensors, transformers, and llama.cpp
---
<div align="center">
<i>"Three forces, one entity — Myth"</i>
</div>

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{
"architectures": [
"Qwen2ForCausalLM"
],
"attention_dropout": 0.0,
"bos_token_id": 151643,
"dtype": "bfloat16",
"eos_token_id": 151643,
"hidden_act": "silu",
"hidden_size": 1536,
"initializer_range": 0.02,
"intermediate_size": 8960,
"layer_types": [
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"full_attention",
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"full_attention"
],
"max_position_embeddings": 131072,
"max_window_layers": 21,
"model_type": "qwen2",
"num_attention_heads": 12,
"num_hidden_layers": 28,
"num_key_value_heads": 2,
"rms_norm_eps": 1e-06,
"rope_scaling": null,
"rope_theta": 10000,
"sliding_window": null,
"tie_word_embeddings": false,
"transformers_version": "4.57.6",
"use_cache": true,
"use_mrope": false,
"use_sliding_window": false,
"vocab_size": 151936
}

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slices:
- sources:
- model: /root/model-step1
layer_range: [0, 28]
- model: Qwen/Qwen2.5-Math-1.5B-Instruct
layer_range: [0, 28]
merge_method: slerp
base_model: /root/model-step1
dtype: bfloat16
parameters:
t:
- filter: self_attn
value: [0.6, 0.4]
- value: [0.5, 0.5]

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{
"add_bos_token": true,
"add_eos_token": false,
"bos_token": {
"__type": "AddedToken",
"content": "<|begin▁of▁sentence|>",
"lstrip": false,
"normalized": true,
"rstrip": false,
"single_word": false
},
"clean_up_tokenization_spaces": false,
"eos_token": {
"__type": "AddedToken",
"content": "<|end▁of▁sentence|>",
"lstrip": false,
"normalized": true,
"rstrip": false,
"single_word": false
},
"legacy": true,
"model_max_length": 16384,
"pad_token": {
"__type": "AddedToken",
"content": "<|end▁of▁sentence|>",
"lstrip": false,
"normalized": true,
"rstrip": false,
"single_word": false
},
"sp_model_kwargs": {},
"unk_token": null,
"tokenizer_class": "LlamaTokenizerFast",
"chat_template": "{% if not add_generation_prompt is defined %}{% set add_generation_prompt = false %}{% endif %}{% set ns = namespace(is_first=false, is_tool=false, is_output_first=true, system_prompt='') %}{%- for message in messages %}{%- if message['role'] == 'system' %}{% set ns.system_prompt = message['content'] %}{%- endif %}{%- endfor %}{{bos_token}}{{ns.system_prompt}}{%- for message in messages %}{%- if message['role'] == 'user' %}{%- set ns.is_tool = false -%}{{'<|User|>' + message['content']}}{%- endif %}{%- if message['role'] == 'assistant' and message['content'] is none %}{%- set ns.is_tool = false -%}{%- for tool in message['tool_calls']%}{%- if not ns.is_first %}{{'<|Assistant|><|tool▁calls▁begin|><|tool▁call▁begin|>' + tool['type'] + '<|tool▁sep|>' + tool['function']['name'] + '\\n' + '```json' + '\\n' + tool['function']['arguments'] + '\\n' + '```' + '<|tool▁call▁end|>'}}{%- set ns.is_first = true -%}{%- else %}{{'\\n' + '<|tool▁call▁begin|>' + tool['type'] + '<|tool▁sep|>' + tool['function']['name'] + '\\n' + '```json' + '\\n' + tool['function']['arguments'] + '\\n' + '```' + '<|tool▁call▁end|>'}}{{'<|tool▁calls▁end|><|end▁of▁sentence|>'}}{%- endif %}{%- endfor %}{%- endif %}{%- if message['role'] == 'assistant' and message['content'] is not none %}{%- if ns.is_tool %}{{'<|tool▁outputs▁end|>' + message['content'] + '<|end▁of▁sentence|>'}}{%- set ns.is_tool = false -%}{%- else %}{% set content = message['content'] %}{% if '</think>' in content %}{% set content = content.split('</think>')[-1] %}{% endif %}{{'<|Assistant|>' + content + '<|end▁of▁sentence|>'}}{%- endif %}{%- endif %}{%- if message['role'] == 'tool' %}{%- set ns.is_tool = true -%}{%- if ns.is_output_first %}{{'<|tool▁outputs▁begin|><|tool▁output▁begin|>' + message['content'] + '<|tool▁output▁end|>'}}{%- set ns.is_output_first = false %}{%- else %}{{'\\n<|tool▁output▁begin|>' + message['content'] + '<|tool▁output▁end|>'}}{%- endif %}{%- endif %}{%- endfor -%}{% if ns.is_tool %}{{'<|tool▁outputs▁end|>'}}{% endif %}{% if add_generation_prompt and not ns.is_tool %}{{'<|Assistant|><think>\\n'}}{% endif %}"
}