Hyperparameters in Deep Learning Models using Bayesian Optimization

Abstract

Hyperparameter optimization is a crucial aspect of deep learning, as the choice of hyperparameters significantly influences model performance. Finding the optimal set of hyperparameters can be a time-consuming and computationally expensive process. Traditional techniques, such as grid search and random search, often fail to efficiently explore the vast hyperparameter space, especially for deep learning models with numerous parameters. In this paper, we propose Bayesian Optimization (BO) as an effective approach for hyperparameter optimization in deep learning models. Bayesian Optimization is a global optimization technique that is particularly suitable for optimizing complex, expensive- to-evaluate functions. Unlike grid search or random search, BO builds a probabilistic model of the objective function and uses this model to make informed decisions about where to search next in the hyperparameter space. This approach reduces the number of evaluations required to find optimal or near-optimal hyperparameters, making it computationally efficient and well-suited for deep learning applications.The paper presents a detailed overview of Bayesian Optimization, its working principles, and how it can be applied to deep learning hyperparameter tuning. We explore the use of Gaussian Processes (GP) as surrogate models for BO and highlight the benefits of using acquisition functions to balance exploration and exploitation. Additionally, we compare BO with traditional methods, evaluating its performance in various deep learning tasks such as image classification, natural language processing, and time-series forecasting.Finally, we discuss the challenges and limitations of using Bayesian Optimization for hyperparameter tuning and offer insights into future directions for improving its efficiency and applicability in large-scale deep learning models.