---
language:
- en
- fr
- es
- zh
- hi
- ja
- ru
license: apache-2.0
library_name: flax
tags:
- jax
- flax
- tpu
- text-generation
- base-model
- custom-architecture
datasets:
- HuggingFaceFW/fineweb-edu
- bigcode/starcoderdata
- HuggingFaceFW/fineweb-2
- open-web-math/open-web-math
metrics:
- loss
- perplexity
pipeline_tag: text-generation
inference: false
---

# Zenyx-Base-220M: High-Density Nano Foundation Model

<div align="center">

![Model Architecture](https://img.shields.io/badge/Model-Zenyx_Base-blue?style=for-the-badge)
![Parameter Count](https://img.shields.io/badge/Params-220M-orange?style=for-the-badge)
![Training Tokens](https://img.shields.io/badge/Tokens-153B-green?style=for-the-badge)
![Format](https://img.shields.io/badge/Weights-Safetensors-yellow?style=for-the-badge)

</div>

**Zenyx-Base-220M** is a 220 million parameter causal language model built from scratch using JAX/Flax on Kaggle TPU v5e-8. 

Unlike typical small models trained on limited data, Zenyx-Base was trained on **~153 Billion tokens**—far exceeding the Chinchilla optimal point for this parameter count. This "over-training" strategy was employed to maximize the information density and logic capabilities of the weights, creating a robust foundation for reasoning tasks.

## 🧠 Model Description

* **Architecture:** Custom Llama-style Transformer (RoPE, SwiGLU, RMSNorm, Grouped Query Attention).
* **Tokenizer:** Qwen 2.5 Tokenizer (151,650 Vocab Size) for high compression efficiency.
* **Context Window:** 2048 Tokens.
* **Training Hardware:** TPU v5e-8.
* **Final Validation Loss:** **~2.38** (Exceptional convergence for 220M).

### Technical Specifications
| Hyperparameter | Value |
| :--- | :--- |
| **Layers** | 12 |
| **Hidden Dim** | 768 |
| **MLP Dim** | 3072 |
| **Attention Heads** | 12 |
| **KV Heads** | 4 (GQA) |
| **Vocab Size** | 151,646 |

## 📚 Training Curriculum (The "Omni-Mix")

The model was trained using a rigorous 4-stage curriculum designed to layer capabilities sequentially:

1.  **Phase 1: Fundamentals (FineWeb-Edu)**
    * Focus on high-quality educational English text to establish linguistic baselines.
2.  **Phase 2: Logic & Structure (StarCoder - Python)**
    * Introduction of code data to enforce logical indentation, syntax, and structured thinking.
3.  **Phase 3: Multilingualism (FineWeb-2)**
    * Exposure to 6 major languages (Hindi, Chinese, Russian, Japanese, French, Spanish) to expand the semantic embedding space.
4.  **Phase 4: The Infinite Polish (Omni-Mix)**
    * A weighted interleaving of all previous datasets plus **OpenWebMath** to converge the model's logic and language capabilities.

## 💻 Usage

This model is a raw **JAX/Flax** checkpoint saved in `.safetensors` format. It uses a custom architecture definition and requires `flax` and `jax` to run.

### Loading with JAX/Flax

```python
import jax
import jax.numpy as jnp
from flax.training import train_state
from flax import serialization
from safetensors.flax import load_file
from transformers import AutoTokenizer
import flax.linen as nn

# 1. Define Architecture (Must match training config)
class TransformerLM(nn.Module):
    vocab_size: int
    embed_dim: int = 768
    num_layers: int = 12
    num_heads: int = 12
    num_kv_heads: int = 4
    mlp_dim: int = 3072
    max_length: int = 2048
    dropout_rate: float = 0.0
    
    # ... (Insert full model class definition here from the training script) ...

# 2. Load Resources
repo_id = "Arko007/Zenyx_Base_220M"
tokenizer = AutoTokenizer.from_pretrained("Qwen/Qwen2.5-0.5B-Instruct", trust_remote_code=True)

# 3. Initialize & Load Weights
model = TransformerLM(vocab_size=len(tokenizer))
dummy_input = jnp.ones((1, 1), dtype=jnp.int32)
params = model.init(jax.random.PRNGKey(0), dummy_input)['params']

# Load Safetensors
# Ensure model.safetensors is downloaded locally
loaded_params = load_file("model.safetensors") 
print("Weights loaded successfully!")
```

## ⚠️ Limitations
- Size: At 220M parameters, the model's knowledge retrieval capacity is limited compared to 7B+ models.
- Base Model: This is a pre-trained base. It has not been fine-tuned for chat or instruction following (see Zenyx-DeepSeek-220M for the instruct version).
- Hallucinations: While logically consistent, it may generate factually incorrect statements.

## 📜 Citation

```python
@misc{ZenyxBase220M,
  title = {Zenyx-Base-220M: High-Density Foundation Model},
  author = {Arko007},
  year = {2025},
  publisher = {HuggingFace},
  url = {[https://huggingface.co/Arko007/Zenyx_Base_220M](https://huggingface.co/Arko007/Zenyx_Base_220M)}
}
```