Towards Effective Network Intrusion Detection: A Hybrid Model Integrating Gini Index and GBDT with PSO

Algorithm 2

PSO algorithm.

1. for each do

2.  Randomly initialize the position and velocity of current particle.

3.  Mark the position of current particle as its best-known position, .

4. end for

5. Calculate the global best known position .

6. for each do

7.  for each do

8.   Update the position and velocity of the ith particle based on (9) and (10).

9.   iffitness > fitness then

10.    

11.   end if

12.   iffitness > fitness then

13.    

14.   end if

15. end for

16. end for