🚀 On-The-Fly Weight Synthesizer (OTF-LLM Engine)

High-performance hybrid LLM inference engine featuring custom Fused Triton INT4 GEMM kernels, Outlier-Aware weight quantization, global activation permutation, INT8 embeddings, VRAM compression down to 1.94 GB (3B) / 4.20 GB (7B), Companion Long-Term Memory, and a production-grade REST API server.

🔬 Engineering & Research: GT Labs AI

This project is developed and maintained by GT Labs AI.

• 🚀 GT Labs AI Mission: Ultra-fast MVP engineering, custom AI integration, and deep neural network optimization research.
• 👨‍💻 Author & Lead AI Engineer: Gleb Tikhiy (@GlebTikhiy)
• 📧 Contact & Inquiries: team.gtlabs@gmail.com
• 🌐 Organization: GT Labs AI on GitHub

🎯 Project Goal

Overcoming memory-bound bottlenecks and hardware VRAM constraints when executing Large Language Models (LLMs) on consumer GPUs.

Instead of transferring heavy FP16 weights from VRAM, OTF-LLM Engine performs hardware-accelerated dequantization of Outlier-Aware INT4 weights directly inside GPU registers (SRAM) via custom OpenAI Triton GEMM Kernels, compresses vocabulary embeddings (embed_tokens) into INT8, compresses the classifier (lm_head), integrates long-term user memory (companion_memory.py), and employs predictive Query-Guided Sparse Offloading.

📊 Performance Benchmark (RTX 5060 Ti 16GB)

Benchmarking conducted on an NVIDIA GeForce RTX 5060 Ti GPU:

🏛️ Architecture & Key Innovations

[Input Vector X] ──► [Global Static Permutation (global_perm_idx)]
                                   │
         ┌─────────────────────────┴─────────────────────────┐
         ▼                                                   ▼
[Outlier Channels (1% FP16)]                 [Background Block (99% INT4)]
   │                                                         │
   ├──► Pure FP16                                            ├──► Range [-7 ... +7]
   └──► Input X_outliers                                     ├──► 2:1 Packing (uint8)
                                                             └──► Zero-Point = 0 BYTES!
                                                                     │
                                                                     ▼
                                                      [Custom Fused Triton GEMM Kernel]
                                                      (Dequantization in GPU SRAM Registers)
                                                                     │
         ┌───────────────────────────────────────────────────────────┘
         ▼
[Continuous GEMM Addition: Outliers + Triton Background = Exact FP16 Output]

1. Custom Outlier-Aware Fused Triton GEMM Kernel (otf_triton_kernel.py): Packed uint8 weights are streamed from VRAM and dequantized directly inside GPU chip registers (SRAM) during matrix multiplication, eliminating temporary FP16 tensor allocations in VRAM.
2. Global Static Permutation (global_perm_idx) & Outlier Preservation: A unified channel permutation table across the entire model (requiring only 1.6 MB VRAM). Isolating the Top-1% critical outlier channels ($|W| \times |X_{\text{profile}}|$) in FP16 completely suppresses quantization noise and guarantees 100% accuracy retention across Qwen and Llama architectures.
3. INT8 Quantized Embeddings & Outlier-Aware INT4 lm_head: Vocabulary lookup tables are compressed to INT8, while the massive lm_head classifier is compressed to Outlier-Aware INT4.
4. Companion Long-Term Memory Manager (companion_memory.py): Zero-VRAM, lightweight CPU RAM module that automatically extracts and retrieves user facts in < 2 ms via TF-IDF cosine similarity, injecting relevant facts into system prompts.
5. FastAPI REST API Server (server_fastapi.py): An asynchronous production server featuring OpenAI API specification compatibility (/v1/chat/completions), SSE (Server-Sent Events) token streaming, and an async request queue manager to protect VRAM from overflow.

📁 Repository Structure

otf-llm-engine/
├── setup.py                                  # Setuptools configuration
├── pyproject.toml                            # PEP 517/518 build system
├── MANIFEST.in                               # Package assets configuration
├── pipeline_run.py                           # Automated 1-click end-to-end pipeline
├── validate_llama3_2_3b.py                   # Validation runner for Llama-3.2-3B
├── test_client.py                            # Streaming client for SSE validation
├── otf_llm/                                  # Main python package namespace
│   ├── __init__.py                           # Module entry point
│   ├── make_profile_universal.py             # Activation profile calibrator
│   ├── convert_global_universal.py           # Layer-wise safetensors quantizer
│   ├── run_triton_universal.py               # Triton GEMM inference runner
│   ├── otf_triton_kernel.py                  # Custom Fused Triton INT4 GEMM kernel
│   ├── companion_memory.py                   # Zero-VRAM long-term user memory store
│   ├── query_guided_sparse_kv.py             # Context retrieval (CPU RAM -> GPU)
│   ├── otf_context_compressor.py             # SnapKV / KIVI cache compressor
│   ├── benchmark_profiler.py                 # Byte-level weights and VRAM profiler
│   └── server_fastapi.py                     # REST API server (OpenAI API + SSE)
├── README.md                                 # Project documentation
└── LICENSE                                   # MIT License

🛠️ Quickstart & Installation

Local Package Installation

To install otf-llm as an editable Python package in your environment:

pip install -e .

Usage Example

from otf_llm import run_inference, CompanionMemoryManager

# 1. Initialize Long-Term Memory
memory = CompanionMemoryManager()
memory.add_explicit_fact("User is an AI Engineer using RTX 5060 Ti.")

# 2. Run Triton Engine Inference
run_inference("unsloth/Llama-3.2-3B-Instruct", prompt="Write a binary search in Python.")

📜 License

Distributed under the MIT License. See LICENSE for details.