Table 9 Multiclass confusion matrix accuracy by attack type (%).

From: (IoT) Network intrusion detection system using optimization algorithms

Attack type

WOA-GWO + LSTM

LSTM-RNN

InfoGain Feature Sel

Multiclass SVM

Normal

99.1

97.3

95.8

96.0

DoS

98.5

96.2

94.7

93.9

Probe

97.8

94.5

92.1

91.4

R2L

93.4

88.7

85.3

84.6

U2R

89.7

76.4

73.9

71.2