Coal Mine Gas Safety Evaluation Based on Adaptive Weighted Least Squares Support Vector Machine and Improved Dempster–Shafer Evidence Theory

Algorithm 1

Algorithm steps.

	Step 1. Based on the modeled sample data, determine the fitting residual of each sample using least squares support vector machine regression
	Step 2. Initialize the weight using equations (6), (8), and (9)
	Step 3. Perform weighted least squares support vector machine regression on the sample data to obtain a regression model
	Step 4. According to the regression model, calculate the residual error ξ of each sample data and recalculate the weight using equations (6), (8), and (9)