A Modified Horse Herd Optimization Algorithm and Its Application in the Program Source Code Clustering

Table 1

Prior methods and tools and their specification.

Reference	Method	Fitness function
[5]	PSO	Single objective
[6]	Firefly	Single objective
[7]	Hill climbing	Single objective
[8]	GA	Single objective
[9]	Two-archive genetic	Multiobjective
[10]	PSO-GA	Single objective
[11]	ACO	Single objective
[12]	SFLA-GA	Single objective
[13]	Hybrid gray wolf	Hybrid single objective
[14]	Chaos-based metaheuristic method	Chaos-based single objective
[15]	PESA-GA	Multiobjective
[17]	Java reverse engineering tool	Single objective
[18]	Hyper-heuristic method	Multiobjective
[19]	Object-oriented method	Multiobjective
[20]	Two-archive ACO	Multiobjective
[21]	Sand Cat swarm	Single objective