Table 3. Sensitivity rank of top 10 input variables in support vector regression (SVR).

BOD		SS		TN
Input	Variation range	Input	Variation range	Input	Variation range
OTU1	0.78%	OTU6	2.54%	OTU1	1.77%
OTU6	0.56%	OTU3	2.03%	OTU6	0.89%
OTU12	0.32%	OTU4	1.81%	OTU12	0.71%
OTU7	0.21%	OTU1	1.06%	OTU4	0.52%
OTU9	0.11%	OTU7	0.92%	OTU10	0.22%
OTU17	0.08%	OTU5	0.86%	OTU5	0.18%
OTU11	0.07%	OTU14	0.81%	OTU14	0.17%
OTU13	0.06%	OTU2	0.72%	OTU3	0.16%
OTU5	0.06%	OTU10	0.55%	OTU20	0.16%
OTU3907	0.05%	OTU9	0.55%	OTU18	0.15%