entropy History of engineering & technology 9 Technology: general issues 9 machine learning 9 Research & information: general 8 information theory 7 deep learning 6 complex systems 4 optimization 4 robustness 4 thermodynamics 4 EEG 3 Gaussian mixture model 3 Kullback–Leibler divergence 3 Tsallis entropy 3 chaos 3 complexity 3 cross-entropy 3 ensembles 3 feature selection 3 heart rate variability 3 image encryption 3 information 3 information entropy 3 longitudinal study 3 multivariate analysis 3 permutation entropy 3 sample entropy 3 uncertainty 3 Kolmogorov complexity 2