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EvoMerge: Neuroevolution for Large Language Models (2402.00070v1)

Published 30 Jan 2024 in cs.NE, cs.AI, cs.CL, and cs.LG

Abstract: Extensive fine-tuning on LLMs does not always yield better results. Oftentimes, models tend to get better at imitating one form of data without gaining greater reasoning ability and may even end up losing some intelligence. Here I introduce EvoMerge, a systematic approach to LLM training and merging. Leveraging model merging for weight crossover and fine-tuning for weight mutation, EvoMerge establishes an evolutionary process aimed at pushing models beyond the limits of conventional fine-tuning.

Citations (1)

Summary

  • The paper demonstrates that combining weight crossover with fine-tuning significantly enhances large language model performance.
  • The methodology employs a six-phase evolutionary framework, including initialization, evaluation, crossover, selection, mutation, and repetition.
  • Exploratory experiments show promising improvements, paving the way for future research in dynamic LLM enhancement techniques.

EvoMerge: Pioneering Neuroevolution Strategies for Enhancing LLMs

Introduction to EvoMerge

The notion of applying neuroevolution methodologies to the development and training of LLMs presents a compelling proposition in the field of artificial intelligence research. The paper introduces EvoMerge, a conceptual framework that amalgamates model merging for weight crossover with fine-tuning for weight mutation into an evolutionary process. This innovative approach aims at transcending the conventional fine-tuning limitations, potentially enabling LLMs to achieve refinements in performance and reasoning capabilities without succumbing to the pitfalls of overfitting or intelligence degradation.

The Evolutionary Concept

EvoMerge draws inspiration from neuroevolution algorithms such as NEAT and empirical observations from successful model merges, particularly highlighting the progressive improvements seen with methodologies like mlabonne/NeuralBeagle14-7B. The fundamental proposition revolves around the iterative training, merging, and re-merging of model variants to explore an expansive parameter and data set space, governed by the Darwinian principle of "survival of the fittest". This approach is speculated not only to enhance model performance iteratively but also to potentially uncover novel intricacies in LLM training dynamics.

Methodological Framework

The EvoMerge concept is structured around six critical phases characteristic of a neuroevolutionary process: Initialization, Evaluation, Crossover, Selection, Mutation, and Repetition. Each phase contributes uniquely to the evolutionary cycle, facilitating the systematic exploration and exploitation of the model landscape. Importantly, the framework emphasizes the necessity for diversified and meticulous evaluation metrics to avoid overfitting and ensure balanced improvements across various intelligence facets of LLMs.

Exploratory Experiments

To substantiate the feasibility of EvoMerge, a series of preliminary experiments were conducted, showcasing the potential benefits of adopting a neuroevolution system for LLM enhancement. The experiments operated on a small scale, utilizing a selected mix of datasets for evaluation and employing techniques such as SLERP for crossover and DPO fine-tuning for mutation. While the experimental results demonstrated modest improvements in model performance across different metrics, they underscore the initiative's exploratory stage and the extensive scope for future research and optimization.

Implications and Future Directions

The introduction of EvoMerge opens up new vistas for research in the domain of LLM development. By integrating evolutionary principles with state-of-the-art AI model training methodologies, this approach holds promise for substantial advancements in model intelligence and versatility. Future research directions could involve refining the evolutionary process, expanding the experimental scale, and exploring a wider array of dataset and parameter configurations. Moreover, investigating the impact of high-quality data and the potential benefits of cross-breeding models originating from disparate bases could further enhance our understanding and capabilities in neuroevolutionary LLM development.

EvoMerge presents an encouraging step forward in the pursuit of more dynamic and intelligent artificial LLMs. The paper sets the stage for a collaborative effort within the research community to delve into uncharted territories of AI development, holding the potential to shape the future trajectory of LLM advancements.

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