# Speeding up the Hyperparameter Optimization of Deep Convolutional Neural Networks

International Journal of Computational Intelligence and Applications,
Volume 17,
Number 2,
pages 1--15,
doi: 10.1142/S1469026818500086
- Jun 2018

Most learning algorithms require the practitioner to manually set the values of many hyperparameters before the learning process can begin. However, with modern algorithms, the
evaluation of a given hyperparameter setting can take a considerable amount of time and the
search space is often very high-dimensional. We suggest using a lower-dimensional representation of the original data to quickly identify promising areas in the hyperparameter space. This
information can then be used to initialize the optimization algorithm for the original, higherdimensional data. We compare this approach with the standard procedure of optimizing the
hyperparameters only on the original input.
We perform experiments with various state-of-the-art hyperparameter optimization algorithms such as random search, the tree of parzen estimators (TPEs), sequential model-based
algorithm con¯guration (SMAC), and a genetic algorithm (GA). Our experiments indicate that
it is possible to speed up the optimization process by using lower-dimensional data representations at the beginning, while increasing the dimensionality of the input later in the optimization process. This is independent of the underlying optimization procedure, making the
approach promising for many existing hyperparameter optimization algorithms.

@Article{HNMW18, author = {Hinz, Tobias and Navarro-Guerrero, Nicolás and Magg, Sven and Wermter, Stefan}, title = {Speeding up the Hyperparameter Optimization of Deep Convolutional Neural Networks}, journal = {International Journal of Computational Intelligence and Applications}, number = {2}, volume = {17}, pages = {1--15}, year = {2018}, month = {Jun}, publisher = {World Scientific Publishing}, doi = {10.1142/S1469026818500086}, }