Hybrid Deep-Learning and Machine-Learning Models for Predicting COVID-19

Table 3

Types and descriptions of the examined models.

Model	Description
Baseline	ConvNet#4: the best model proposed by Sekeroglu and Ozsahin in [6]
Model 1	The proposed CNN model
Model 2a	The proposed TL model with VGG16
Model 2b	The proposed TL model with VGG19
Model 3a	The proposed hybrid model of CNN with ML where the features are extracted from the flatten layer
Model 3b	The proposed hybrid model of CNN with ML where the features are extracted from the first hidden layer
Model 4a	The proposed hybrid model of VGG16 with ML where the features are extracted from the flatten layer
Model 4b	The proposed hybrid model of VGG16 with ML where the features are extracted from the first hidden layer