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Wyświetlanie 1-2 z 2
Tytuł:
Stochastic schemata exploiter-based optimization of hyper-parameters for XGBoost
Autorzy:
Makino, Hiroya
Kita, Eisuke
Powiązania:
https://bibliotekanauki.pl/articles/38707755.pdf
Data publikacji:
2024
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
evolutionary computation
Stochastic Schemata Exploiter
hyperparameter optimization
XGBoost
obliczenia ewolucyjne
eksplorator schematów stochastycznych
optymalizacja hiperparametrów
Opis:
XGBoost is well-known as an open-source software library that provides a regularizing gradient boosting framework. Although it is widely used in the machine learning field, its performance depends on the determination of hyper-parameters. This study focuses on the optimization algorithm for hyper-parameters of XGBoost by using Stochastic Schemata Exploiter (SSE). SSE, which is one of Evolutionary Algorithms, is successfully applied to combinatorial optimization problems. SSE is applied for optimizing hyper-parameters of XGBoost in this study. The original SSE algorithm is modified for hyper-parameter optimization. When comparing SSE with a simple Genetic Algorithm, there are two interesting features: quick convergence and a small number of control parameters. The proposed algorithm is compared with other hyper-parameter optimization algorithms such as Gradient Boosted Regression Trees (GBRT), Tree-structured Parzen Estimator (TPE), Covariance Matrix Adaptation Evolution Strategy (CMA-ES), and Random Search in order to confirm its validity. The numerical results show that SSE has a good convergence property, even with fewer control parameters than other methods.
Źródło:
Computer Assisted Methods in Engineering and Science; 2024, 31, 1; 113-132
2299-3649
Pojawia się w:
Computer Assisted Methods in Engineering and Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Classification of cognitive states using clustering-split time series framework
Autorzy:
Ramakrishna, J. Siva
Ramasangu, Hariharan
Powiązania:
https://bibliotekanauki.pl/articles/38708362.pdf
Data publikacji:
2024
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
functional MRI data
classification
consensus clustering
SVM classifier
GNB classifier
XGBoost
funkcjonalne dane MRI
klasyfikacja
grupowanie konsensusu
klasyfikator SVM
klasyfikator GNB
Opis:
Over the last two decades, functional Magnetic Resonance Imaging (fMRI) has provided immense data about the dynamics of the brain. Ongoing developments in machine learning suggest improvements in the performance of fMRI data analysis. Clustering is one of the critical techniques in machine learning. Unsupervised clustering techniques are utilized to partition the data objects into different groups. Supervised classification techniques applied to fMRI data facilitate the decoding of cognitive states while a subject is engaged in a cognitive task. Due to the high dimensional, sparse, and noisy nature of fMRI data, designing a classifier model for estimating cognitive states becomes challenging. Feature selection and feature extraction techniques are critical aspects of fMRI data analysis. In this work, we present one such synergy, a combination of Hierarchical Consensus Clustering (HCC) and the Statistics of Split Timeseries (SST) framework to estimate cognitive states. The proposed HCC-SST model’s performance has been verified on StarPlus fMRI data. The obtained experimental results show that the proposed classifier model achieves 99% classification accuracy with a smaller number of voxels and lower computational cost.
Źródło:
Computer Assisted Methods in Engineering and Science; 2024, 31, 2; 241-260
2299-3649
Pojawia się w:
Computer Assisted Methods in Engineering and Science
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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