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How to Perform Hyperparameter Optimization in PyTorch Using Optuna
Data Science   Latest   Machine Learning

How to Perform Hyperparameter Optimization in PyTorch Using Optuna

Last Updated on September 27, 2024 by Editorial Team

Author(s): Benjamin Bodner

Originally published on Towards AI.

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All neural networks require hyperparameters to be selected as part of the training process, and they can have very significant effects on the speed of convergence and final performance.

These hyperparameters require special tuning to maximize the potential of your model properly. This hyperparameter tuning process is an integral part of neural network training, and it is, in a sense, the β€œgradient-free” component in a mostly β€œgradient-based” optimization problem.

In this post, we will explore one of the leading libraries in hyperparameter optimization, Optuna, which makes the process super simple and highly effective. We’ll break down the process into 5 simple steps.

We’ll start by importing the relevant packages and creating a simple, fully-connected neural network using PyTorch. A fully connected neural network is defined with one hidden layer.

For reproducibility, we also set a manual random seed.

Next, we’ll set up the standard components we will need for hyperparameter optimization. We’ll perform the following steps:

1. Download the FashionMNIST dataset.

2. Define the hyperparameter search space: We define (a) which hyperparameters we want to optimize and (b) what values we want to allow them to take. In… Read the full blog for free on Medium.

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