---

EKA-1 is a decoder-only Transformer with 109,529,856 parameters, trained entirely from scratch on classical texts from Project Gutenberg. It features a modern architecture — RMSNorm, Rotary Position Embeddings (RoPE), SwiGLU activation, multi-head causal attention via PyTorch SDPA, and weight tying — packed into a library with a clean, one-line API.

---

Table of Contents

• Features
• Installation
• Quick Start
• API Reference
• Model Architecture
• Model Configuration
• Examples
• Development
• Publishing to PyPI
• License

---

Features

Feature	Status
Automatic model & tokenizer download	✅
CPU inference	✅
CUDA inference	✅
Text generation	✅
Chat interface (single & multi-turn)	✅
Streaming generation	✅
Temperature sampling	✅
Top-k sampling	✅
Top-p (nucleus) sampling	✅
Repetition penalty	✅
Context truncation	✅
PEP 561 typed package	✅

---

Installation

From PyPI (recommended):

pip install eka-ai

From source:

git clone https://github.com/eka-ai/eka-ai.git
cd eka-ai
pip install -e ".[dev]"

Requirements:

• Python ≥ 3.9
• PyTorch ≥ 2.1
• sentencepiece ≥ 0.1.99
• gdown ≥ 4.7.3

[!IMPORTANT] System Requirements & Recommendations:

• Memory (RAM): We recommend a minimum of 8 GB RAM overall, with at least 3 GB of free RAM dedicated to model execution.
• Hardware Acceleration: For faster response times and better usage, it is highly recommended to run this package on a GPU.
• Cloud Notebooks: We strongly recommend running this package in Google Colab or Kaggle Notebooks with GPU acceleration enabled for the fastest speeds.

On first use, EKA() automatically downloads eka_model.pt (~424 MB) and tokenizer.model (~768 KB) to ~/.cache/eka_ai/.

Custom cache location: Set the EKA_CACHE_DIR environment variable to override the default cache directory.

---

Quick Start

from eka_ai import EKA

# Loads model on first call — downloads files automatically
model = EKA()

# ── Text generation ────────────────────────────────────────
print(
    model.generate(
        "Tell me about the Roman Empire",
        max_new_tokens=128,
    )
)

# ── Single-turn chat ───────────────────────────────────────
print(
    model.chat(
        "Who was Ashoka?"
    )
)

# ── Streaming generation ───────────────────────────────────
for token in model.stream(
    "Tell me a story"
):
    print(token, end="", flush=True)

---

API Reference

EKA(...) — constructor

model = EKA(
    device=None,           # "cpu" | "cuda" | torch.device — auto-detected
    dtype=None,            # torch.bfloat16 on CPU by default
    model_path=None,       # override cached model path
    tokenizer_path=None,   # override cached tokenizer path
    auto_download=True,    # download files if not cached
    system_prompt=None,    # custom system prompt for chat()
    verbose=True,          # print loading progress
)

---

model.generate(prompt, ...) → str

Generate a text continuation for a plain prompt.

text = model.generate(
    prompt,
    max_new_tokens=256,        # int   — max tokens to generate
    temperature=0.8,           # float — sampling temperature (> 0)
    top_k=50,                  # int   — top-k cutoff (0 = disabled)
    top_p=0.95,                # float — nucleus threshold (1.0 = disabled)
    repetition_penalty=1.1,    # float — penalty for repeated tokens (1.0 = disabled)
    return_result=False,       # bool  — return GenerationResult with metadata
)

When return_result=True, returns a GenerationResult with attributes:

• .text — the generated text
• .tokens_generated — number of new tokens
• .tokens_per_second — generation throughput
• .device — device used

---

model.chat(message, ...) → str

Single-turn or multi-turn chat using the built-in chat template.

reply = model.chat(
    message,
    history=None,              # list of (user, assistant) tuples
    system_prompt=None,        # override instance system prompt
    max_new_tokens=256,
    temperature=0.8,
    top_k=50,
    top_p=0.95,
    repetition_penalty=1.1,
)

Multi-turn example:

history = []
reply1 = model.chat("Who was Julius Caesar?")
history.append(("Who was Julius Caesar?", reply1))

reply2 = model.chat("What were his greatest conquests?", history=history)

---

model.stream(prompt, ...) → Iterator[str]

Streaming generation — yields one decoded token piece at a time.

for piece in model.stream(
    "The ancient library of",
    max_new_tokens=128,
    temperature=0.8,
):
    print(piece, end="", flush=True)

---

model.stream_chat(message, ...) → Iterator[str]

Like stream() but uses the chat template.

for piece in model.stream_chat("Tell me about Socrates"):
    print(piece, end="", flush=True)

---

model.info() → dict

info = model.info()
# {
#   "version": "1.0.0",
#   "parameters": 109529856,
#   "device": "cpu",
#   "dtype": "torch.bfloat16",
#   "vocab_size": 32000,
#   "n_layers": 12,
#   "n_heads": 12,
#   "d_model": 768,
#   "context_length": 512,
# }

---

Model Architecture

EKA-1 is a decoder-only Transformer with the following design choices:

Component	Implementation
Normalisation	RMSNorm (no bias, no mean subtraction)
Position encoding	Rotary Position Embeddings (RoPE) — no learned position table
Feed-forward	SwiGLU — down(silu(gate(x)) ⊙ up(x))
Attention	Multi-Head Causal Attention via PyTorch scaled_dot_product_attention
Weight sharing	Weight tying — embedding and LM-head share parameters
Architecture	Pre-norm residual blocks
Bias	None (all linear layers are bias-free)

The attention implementation uses PyTorch's built-in SDPA which automatically selects the optimal kernel: FlashAttention 2 (when available), memory-efficient attention, or the reference implementation.

---

Model Configuration

{
  "vocab_size": 32000,
  "n_layers": 12,
  "n_heads": 12,
  "n_kv_heads": 12,
  "d_model": 768,
  "d_ffn": 3072,
  "context_length": 512,
  "dropout": 0.0,
  "bias": false
}

Parameter	Value
Total parameters	109,529,856
Embedding dimension	768
Attention heads	12 × 64-dim heads
Transformer layers	12
FFN hidden dim	2048 (after SwiGLU 2/3 ratio)
Vocabulary	32,000 BPE tokens (SentencePiece)
Context length	512 tokens
Training data	Project Gutenberg

---

Examples

Run the provided example scripts from the repository root:

# Interactive text generation
python examples/generation.py --prompt "The fall of Rome" --max_tokens 200

# Interactive chat REPL
python examples/chat.py
python examples/chat.py --stream       # streaming mode
python examples/chat.py --device cuda  # GPU

# Throughput benchmark
python examples/benchmark.py --runs 10 --max_tokens 256
python examples/benchmark.py --device cuda

---

Development

# Clone and install in editable mode with dev extras
git clone https://github.com/eka-ai/eka-ai.git
cd eka-ai
pip install -e ".[dev]"

# Run the full test suite
pytest tests/ -v

# Run specific test file
pytest tests/test_model.py -v

# Lint
ruff check eka_ai/ tests/
black --check eka_ai/ tests/ examples/

# Auto-format
black eka_ai/ tests/ examples/
isort eka_ai/ tests/

# Type check
mypy eka_ai/

Project Structure

eka-ai/
│
├── eka_ai/
│   ├── __init__.py       # Public API exports
│   ├── config.py         # EKAConfig dataclass
│   ├── model.py          # EKA1Model architecture
│   ├── tokenizer.py      # EKATokenizer (SentencePiece wrapper)
│   ├── downloader.py     # Automatic model/tokenizer download
│   ├── generation.py     # EKA high-level API
│   ├── utils.py          # Sampling utilities
│   └── py.typed          # PEP 561 marker
│
├── examples/
│   ├── chat.py           # Interactive chat REPL
│   ├── generation.py     # Text generation demo
│   └── benchmark.py      # Throughput benchmark
│
├── tests/
│   ├── test_config.py    # Config unit tests
│   ├── test_model.py     # Architecture unit tests
│   ├── test_utils.py     # Sampling utility tests
│   └── test_generation.py# API integration tests
│
├── .github/workflows/
│   ├── publish.yml       # PyPI publishing workflow
│   └── tests.yml         # CI test matrix
│
├── README.md
├── LICENSE               # Apache 2.0
├── setup.py
├── pyproject.toml
├── requirements.txt
└── MANIFEST.in

Citation

If you use EKA-1 in your research, please cite:

@misc{eka1_2024,
  title  = {{EKA-1}: A 109M Parameter Historical Language Model},
  author = {chvkrsubhash},
  year   = {2026},
  url    = {https://github.com/eka-ai/eka-ai},
  note   = {Trained from scratch on Project Gutenberg}
}

---

License

This project is licensed under the Apache License 2.0 — see LICENSE for details.

The training data is sourced from Project Gutenberg, which consists of public-domain works.