GPT-MoE-MCTS: GPT with Mixture of Experts and Monte Carlo Tree Search

Table of Contents

1. Introduction
2. Key Features
3. Model Architecture
4. Installation
5. Usage
6. Training
7. Evaluation
8. MCTS Decoding
9. Contributing

Introduction

GPT-MoE-MCTS is an advanced language model that combines the power of GPT (Generative Pre-trained Transformer) with Mixture of Experts (MoE) and Monte Carlo Tree Search (MCTS) decoding. This model is designed to provide high-quality text generation with improved efficiency and performance.

Key Features

• GPT-based Architecture: Utilizes the powerful GPT architecture for language modeling.
• Mixture of Experts: Incorporates a dynamic routing system to specialize different parts of the network for different inputs.
• FlashAttention3: Implements an optimized attention mechanism for improved efficiency.
• Monte Carlo Tree Search Decoding: Uses MCTS during inference for higher quality text generation.
• Hugging Face Compatible: Easily integrates with the Hugging Face Transformers library.

Model Architecture

The GPT-MoE-MCTS model consists of the following key components:

1. Token and Positional Embeddings: Converts input tokens into embeddings and adds positional information.
2. Transformer Blocks with MoE: Multiple layers of transformer blocks, each incorporating:
   • FlashAttention3: An optimized attention mechanism.
   • Mixture of Experts Layer: A dynamic routing system for specialized processing.
   • Feed-Forward Network: Standard MLP for additional processing.
3. Output Layer: Final layer normalization and projection to vocabulary logits.

Installation

To install the GPT-MoE-MCTS model, follow these steps:

git clone https://github.com/yourusername/gpt-moe-mcts.git
cd gpt-moe-mcts
pip install -r requirements.txt

Usage

Here's a basic example of how to use the GPT-MoE-MCTS model:

from transformers import GPT2Tokenizer
from modeling_gpt_moe_mcts import GPTMoEMCTSModel
from configuration_gpt_moe_mcts import GPTMoEMCTSConfig

# Initialize configuration and model
config = GPTMoEMCTSConfig()
model = GPTMoEMCTSModel(config)

# Initialize tokenizer (using GPT2Tokenizer as a base)
tokenizer = GPT2Tokenizer.from_pretrained("gpt2")

# Prepare input
text = "Hello, how are you?"
inputs = tokenizer(text, return_tensors="pt")

# Forward pass
outputs = model(**inputs)

# Get the predicted next token
next_token_logits = outputs.logits[0, -1, :]
next_token = next_token_logits.argmax()

# Decode the predicted token
predicted_text = tokenizer.decode(next_token)

print(f"Input: {text}")
print(f"Predicted next token: {predicted_text}")

Training

To train the GPT-MoE-MCTS model on your own data:

1. Prepare your dataset in the format of tokenized .npy files.
2. Adjust the hyperparameters in the train_model() function in train.py.
3. Run the training script:

python train.py

The script will automatically save checkpoints and display training progress.

Evaluation

To evaluate the model's performance:

from eval_utils import evaluate_model

perplexity, accuracy = evaluate_model(model, eval_dataloader)
print(f"Perplexity: {perplexity}, Accuracy: {accuracy}")

MCTS Decoding

The GPT-MoE-MCTS model uses Monte Carlo Tree Search for decoding during inference. To use MCTS decoding:

from mcts_decode import mcts_decode

generated_text = mcts_decode(model, input_text, max_length=50, num_simulations=100)
print(f"Generated text: {generated_text}")

Contributing

We welcome contributions to the GPT-MoE-MCTS project! If you're interested in contributing, please visit our GitHub repository for more information on how to get involved. You can submit issues, feature requests, or pull requests there.

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For more detailed information about the model architecture, training process, and advanced usage, please refer to our documentation.

If you use GPT-MoE-MCTS in your research, please cite:

@misc{GPT-MoE-MCTS,
  author = {Robbie Pasquale},
  title = {GPT-MoE-MCTS: GPT with Mixture of Experts and Monte Carlo Tree Search},
  year = {2024},
  publisher = {GitHub},
  journal = {GitHub repository},
  howpublished = {\url{https://github.com/RPasquale/gpt-moe-mcts}},
  version = {1.0.0},
  note = {This project is currently in development.}
}