Table 4.

Mutation operator for neutrality analysis

Operator	Description
Change activation function	It replaces the value of the hyperparameter of the given model with other pre-defined values from Keras.
Change kernel initialisers
Change bias initialisers
Change loss function
Change optimiser
Change learning rate	It changes the learning rate by either multiplying it by ten or dividing it by ten.
Change epochs	It changes the epochs by either multiplying it by two or dividing it by two.
Change batch size	It replaces the batch size with other pre-defined values of 16, 32, 64, 128, 256, 512.
Change layer	It either duplicates or deletes the given layer.
Change the number of neurons in a given dense layer	It changes the number of neurons by either multiplying its number by two or dividing it by two.