README.md

metadata

license: mit
language:
  - en
base_model:
  - mistralai/Mistral-7B-Instruct-v0.3
pipeline_tag: text-generation

ALCCA: Adaptive Large Chunk Context Attention Model Card

NOTE: The model architecture was changed to this new attention mechanism and was not trained to adapt its weights to it, so it might not be very efficient.

Introduction

The Adaptive Large Chunk Context Attention (ALCCA) model represents a significant advancement in the field of natural language processing, designed to address the challenges of processing long sequences in large language models. Developed at BootCode I.T Hub, under the leadership of Prince Mawuko Dzorkpe, ALCCA introduces an innovative attention mechanism that balances computational efficiency with model performance.

BootCode I.T Hub, a cutting-edge technology company based in Ghana, has been at the forefront of developing solutions that push the boundaries of AI and machine learning. Under the visionary guidance of Prince Mawuko Dzorkpe, the team at BootCode (https://bootcode-gh.com) has created ALCCA as a response to the growing need for more efficient and scalable language models.

Model Overview

ALCCA is built upon the foundation of the Mistral-7B-v0.3 model, enhancing its capabilities through a novel attention mechanism inspired by the Barnes-Hut algorithm. This approach allows ALCCA to process longer sequences more efficiently than traditional attention methods, opening up new possibilities for applications in natural language understanding and generation.

Base Architecture

• Foundation: Mistral-7B-v0.3
• Parameters: 7 billion
• Attention Mechanism: ALCCA (replacing standard attention)
• Quantization: 8-bit using BitsAndBytes

ALCCA Mechanism Explained

The core innovation of ALCCA lies in its attention mechanism, which utilizes a tree-based structure to approximate attention computations. This approach combines the benefits of sparse attention with adaptive computation, resulting in a more efficient processing of long sequences.

Key Components:

1. Spatial partitioning of key vectors using FAISS
2. Adaptive computation based on query-key distances
3. GPU-accelerated operations

Mathematical Formulation

For each query vector q_i:

1. Compute distance to key vectors' center of mass: d_i = ||q_i - CoM||
2. If d_i < θ (threshold): attention_i = mean(V)
3. Else:
   • Find k nearest neighbors using FAISS
   • Compute weights: w_j = 1 / (d_ij + ε)
   • Normalize: w'_j = w_j / Σ(w_j)
   • attention_i = Σ(w'_j * v_j)

Final output: O = W_o * concat(O_1, O_2, ..., O_h)

Where:

• θ: approximation threshold
• k: number of nearest neighbors
• ε: small constant (e.g., 1e-8)
• W_o: output projection matrix

Comparative Analysis

ALCCA's performance is compared with full attention, sliding window attention, and sparse attention for a sequence of 1000 tokens. We'll exclude the embedding dimension d and only focus on the sequence length n = 1000.

1. Full Attention

• Computation: O(n^2)
• Memory: O(n^2)
• Example (1000 tokens):
  • Computations: 1000^2 = 1,000,000
  • Memory usage: 1000^2 = 1,000,000 units

2. Sliding Window Attention (window size w = 100)

• Computation: O(n · w)
• Memory: O(n · w)
• Example (1000 tokens, w = 100):
  • Computations: 1000 · 100 = 100,000
  • Memory usage: 1000 · 100 = 100,000 units

3. Sparse Attention (sparsity factor s = 0.1)

• Computation: O(s · n^2)
• Memory: O(s · n^2)
• Example (1000 tokens, s = 0.1):
  • Computations: 0.1 · 1000^2 = 100,000
  • Memory usage: 0.1 · 1000^2 = 100,000 units

4. ALCCA (k = 8 nearest neighbors)

• Computation: O(n · log(n) + k · n)
• Memory: O(n)
• Example (1000 tokens, k = 8):
  • Computations: 1000 · log(1000) + 8 · 1000 ≈ 3000 + 8,000 = 11,000
  • Memory usage: 1000 units

Advantages of ALCCA

1. Scalability: Efficiently handles long sequences with sub-quadratic complexity
2. Adaptive Computation: Balances speed and accuracy based on input complexity
3. Memory Efficiency: Linear memory usage in sequence length
4. GPU Optimization: Leverages GPU acceleration for key operations
5. Flexibility: Adjustable parameters (θ, k) for fine-tuning performance

Limitations and Considerations

1. Approximation Trade-off: May sacrifice some accuracy for efficiency
2. Parameter Sensitivity: Requires careful tuning of θ and k
3. Implementation Complexity: More complex than standard attention mechanisms
4. Task Dependency: Performance may vary across different NLP tasks

Usage Guide

from transformers import AutoTokenizer, AutoModelForCausalLM

# Load model and tokenizer
model_name = "path/to/alcca_model"
tokenizer = AutoTokenizer.from_pretrained(model_name)
model = AutoModelForCausalLM.from_pretrained(model_name)

# Generate text
input_text = "Analyze the impact of artificial intelligence on modern healthcare systems:"
input_ids = tokenizer.encode(input_text, return_tensors="pt")
output = model.generate(input_ids, max_length=500, temperature=0.7)
generated_text = tokenizer.decode(output[0], skip_special_tokens=True)

print(generated_text)

Ethical Considerations

• Inherits biases from the base Mistral-7B-v0.3 model
• Potential for generating misleading or biased content
• Not suitable for critical decision-making without human oversight
• Users should implement appropriate content filtering and bias detection

Future Research Directions

1. Extensive benchmarking across various NLP tasks and sequence lengths
2. Exploration of dynamic threshold and neighbor selection techniques
3. Integration with other efficient attention mechanisms (e.g., linear attention)
4. Development of task-specific fine-tuning strategies
5. Investigation of interpretability methods for ALCCA

Performance Implications

ALCCA demonstrates significant computational efficiency gains:

• 98.7% reduction in computations compared to full attention
• 87% reduction compared to both sliding window and sparse attention

These improvements allow for:

1. Processing longer sequences with the same computational resources
2. Reduced inference time for language tasks
3. Lower energy consumption, contributing to more environmentally friendly AI applications

Implementation Details

ALCCA is implemented by replacing standard attention layers in Mistral-7B-v0.3 with custom ALCCA layers, featuring:

1. FAISS integration for efficient nearest neighbor search
2. GPU-optimized operations for tree construction and traversal
3. Adaptive thresholding mechanism
4. 8-bit quantization using BitsAndBytes

Citation

If you use ALCCA in your research or applications, please cite:

@misc{alcca2024,
  title={ALCCA: Adaptive Large Chunk Context Attention for Efficient Language Modeling},
  author={Dzorkpe, Prince Mawuko and BootCode I.T Hub Team},
  year={2024},
  howpublished={\url{https://bootcode-gh.com}},
}

Acknowledgments

We thank the Mistral AI team for their work on the Mistral-7B-v0.3 model. We also acknowledge the contributions of the open-source community in developing efficient attention mechanisms that inspired this work. Special thanks to Prince Mawuko Dzorkpe and the entire team at BootCode I.T Hub for their innovative approach and dedication to advancing the field of AI and machine learning.