COD Optimization Prediction Model Based on CAWOA-ELM in Water Ecological Environment

Table 2

Performance comparison of 4 algorithms.

Sample	True data	CAWOA-ELM			PSO-ELM			BBO-ELM			WOA-ELM
		PV	ER	RE (%)	PV	ER	RE (%)	PV	ER	RE (%)	PV	ER	RE (%)
1	1.766	1.84	0.07	3.96	2.02	0.25	14.16	1.85	0.08	4.53	2.05	0.28	15.86
2	1.895	2.01	0.11	5.80	2.13	0.23	12.14	2.11	0.21	11.08	2.19	0.29	15.30
3	1.543	1.75	0.21	13.61	1.92	0.38	24.63	1.81	0.27	17.50	1.81	0.27	17.50