Backpropagation 18 Neural networks 17 Back-propagation neural networks 12 Forecasting 6 Mean square error 6 article 6 back propagation 6 human 5 Back Propagation 4 Neural network model 4 Optimization 4 back propagation neural network 4 nonlinear system 4 Algorithms 3 BP neural network 3 Decision trees 3 E-learning 3 Multilayer neural networks 3 Neural-networks 3 Particle swarm optimization (PSO) 3 Performance 3 Students 3 algorithm 3 artificial neural network 3 machine learning 3 Auto-regressive 2 BP neural networks 2 Back propagation (Artificial intelligence) 2 Back propagation neural networks 2 Back-propagation 2