[Retracted] Prediction of Chemical Corrosion Rate and Remaining Life of Buried Oil and Gas Pipelines in Changqing Gas Field

Table 3

Comparison of each cross-validation with green synthesis and metal oxide composites.

Number of cross-validations	Convergence status		RMSE		Smoothing factor
	Standard PSO	Improved PSO	Standard PSO	Improved PSO	Standard PSO	Improved PSO
1	65	54	0.0353	0.0303	0.933	1.251
2	90	68	0.0349	0.0332	0.853	1.284
3	121	78	0.0335	0.0309	0.763	1.182
4	97	62	0.0315	0.0306	0.821	1.243
Mean	93.25	65.5	0.0338	0.03125	0.8425	1.24