Table 4.

Hybrid Models: DCDNN (deep convolutional denoising neural network), BGRU (bidirectional gated recurrent unit), SVR (support vector regression).

Hybrid models	n.
BiLSTM + CNN	2
CNN-XGboost	1
DCDNN + CNN	1
CNN + LSTM	1
CNN + LRCN	1
CNN + RNN	1
CNN + BGRU	1
CNN + SVR	1
Random Forest + SVM	1
SVM + XGBoost + Linear regression	1