---
license: mit
language:
  - zh
  - en
tags:
  - stellarai
  - multimodal
  - tiny-llm
  - causal-lm
  - text-generation
  - vision
  - cpu-friendly
library_name: transformers
pipeline_tag: text-generation
widget:
  - text: "Artificial intelligence is"
    example_title: "English Generation"
  - text: "人工智能是一种"
    example_title: "Chinese Generation"
---

# StellarAI-Tiny

**A lightweight multimodal language model trained from scratch — ~50M parameters (0.05B), runs on CPU with 4GB RAM.**

[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
[![PyTorch](https://img.shields.io/badge/PyTorch-2.0+-ee4c2c)](https://pytorch.org/)
[![Model Size](https://img.shields.io/badge/Size-~93MB-blue)](#)
[![Parameters](https://img.shields.io/badge/Params-50M-green)](#)

---

## Overview

StellarAI-Tiny is a from-scratch, bilingual (Chinese + English) causal language model with multimodal vision support. Designed for educational and prototyping purposes, it requires minimal hardware and ships with a built-in plugin system for tool calling.

| Feature | Description |
|---------|-------------|
| Lightweight | 50M parameters, ~93MB weights |
| CPU-friendly | Runs smoothly on CPU with 4GB RAM |
| Transformer | 4-layer text encoder + RoPE positional encoding |
| Multimodal | CNN + ViT hybrid vision encoder + cross-attention fusion |
| Bilingual | Chinese + English mixed tokenization & generation |
| License | MIT — fully permissive for commercial use |
| Plugins | Built-in calculator, knowledge base, translator, text tools, time queries |

---

## Architecture

```
StellarAI-Tiny (~50M Parameters)
├── Embedding          vocab(32000) x d_model(384)
├── Text Transformer (4 layers)
│   ├── Multi-Head Self-Attention (6 heads, RoPE)
│   └── FFN (GELU, intermediate=1536)
├── Vision Encoder (CNN + ViT)
│   ├── CNN Feature Extractor (4 layers: 24→48→96→192 channels)
│   └── ViT Transformer (2 layers, 6 heads)
├── Fusion Block (1 layer)
│   ├── Self-Attention + Cross-Attention
│   └── FFN (1536)
└── LM Head (tied weights)
```

| Config | Value |
|--------|-------|
| `d_model` | 384 |
| `num_hidden_layers` | 4 |
| `num_attention_heads` | 6 |
| `intermediate_size` | 1536 |
| `vocab_size` | 32000 |
| `max_position_embeddings` | 1024 |
| `vision_num_layers` | 2 |
| `fusion_num_layers` | 1 |
| Total parameters | ~50M (0.05B) |

---

## Quick Start

### Requirements

```bash
pip install torch transformers safetensors
```

### Text Generation

```python
from transformers import AutoModelForCausalLM, AutoConfig, AutoTokenizer
import torch

model_name = "amtstudio/stellarai-tiny"  # or your local path

config = AutoConfig.from_pretrained(model_name, trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(
    model_name,
    config=config,
    trust_remote_code=True,
    torch_dtype=torch.float32,
)
tokenizer = AutoTokenizer.from_pretrained(model_name, trust_remote_code=True)

# Generate
prompt = "Artificial intelligence is"
inputs = tokenizer(prompt, return_tensors="pt")

output_ids = model.generate(
    **inputs,
    max_new_tokens=64,
    temperature=0.7,
    top_k=40,
    do_sample=True,
    pad_token_id=tokenizer.pad_token_id,
    eos_token_id=tokenizer.eos_token_id,
)

print(tokenizer.decode(output_ids[0], skip_special_tokens=True))
```

### Using `generate_text` Convenience Method

```python
result = model.generate_text(
    prompt="Artificial intelligence is",
    tokenizer=tokenizer,
    max_new_tokens=100,
    temperature=0.8,
)
print(result)
```

---

## Training Details

| Item | Detail |
|------|--------|
| Training steps | 12,000 (5,000 base + 7,000 general training) |
| Corpus | 19,846 lines of bilingual data (AI, CS, NLP, math, programming, reasoning, dialogue, plugins) |
| Optimizer | AdamW (lr=3e-4, wd=0.01) |
| LR Schedule | Cosine annealing + Warmup (100 steps) |
| Batch size | 4 |
| Sequence length | 128 |
| Gradient clipping | 1.0 |
| Final loss | 4.06 (ppl ≈ 58) |
| Vocabulary size | 11,030 |
| Device | CPU |
| Training time | ~3.2 hours |

The training corpus was built from a mix of hand-crafted bilingual data, synthetic instruction-tuning data, and Chinese NLP datasets across 10+ domains. The model was trained with a next-token-prediction objective using the custom `SimpleTokenizer` (BPE).

---

## File Structure

```
├── config.json                    # HF model configuration
├── configuration_stellarai.py     # Custom PretrainedConfig class
├── modeling_stellarai.py          # Custom PreTrainedModel class
├── tokenization_stellarai.py      # Custom PreTrainedTokenizer class
├── model.safetensors              # Safetensors weights (93.6 MB)
├── pytorch_model.bin              # PyTorch weights (93.6 MB)
├── tokenizer_config.json          # Tokenizer configuration
├── special_tokens_map.json        # Special token mappings
├── tokenizer.json                 # HF tokenizer definition (BPE)
├── backend_tokenizer.json         # Original backend tokenizer
├── vocab.json                     # BPE vocabulary (11,030 tokens)
├── merges.txt                     # BPE merge rules
├── README.md                      # This file
└── LICENSE                        # MIT License
```

---

## Limitations

> **Important**: This is a lightweight educational / prototyping model.

1. **Limited knowledge**: Trained on ~19K lines of curated data. Knowledge coverage is narrow.
2. **Factual accuracy**: May produce inaccurate, nonsensical, or hallucinated content.
3. **Generation quality**: Suitable for demonstrating basic language modeling — not production-level dialogue.
4. **Vision capability**: The vision encoder is pre-trained on text-only data. VQA requires additional fine-tuning with image-text pairs.
5. **Plugin calling**: The model learned the `[TOOL:xxx]` format but calling accuracy needs improvement.
6. **Not suitable for**: Production environments, medical/legal/financial domains.

### Suggested Improvements

- [ ] Expand corpus to 50K+ lines or use public datasets (WikiText, C4, Oscar)
- [ ] Increase training to 50K+ steps
- [ ] Add real dialogue data (ShareGPT, Alpaca format) for SFT
- [ ] Collect image-text pairs (e.g., COCO captions) to fine-tune multimodal capability
- [ ] Try larger config: 6 layers / 512d / 8 heads (~0.1B)

---

## License

[MIT License](LICENSE) — fully permissive for personal and commercial use.

---

## Acknowledgements

- Architecture inspired by GPT-2, LLaMA, ViT, and BLIP-2
- Built with Hugging Face `transformers`
- RoPE: *RoFormer: Enhanced Transformer with Rotary Position Embedding*

---

**StellarAI** — Exploring AI, one star at a time.