Table 1 20 input features used for Sigma-RF are listed along with their importance estimates

F1

|I−J|

7.51

F2

|I−J|/N _{r e s,t a r g e t}

2.91

F3

d _template

9.43

F4

m _I,K m _J,L

2.55

F5

\(\sum _{\substack {I \leq i \leq J\\ K \leq j \leq L}} m_{i,j}\delta (i,j)/\sum _{\substack {I \leq i \leq J\\ K \leq j \leq L}}\delta (i,j)\)

16.81

F6

\(N_{\textit {gap}}^{IJ}\)

1.91

F7

\(N_{\textit {gap}}^{IJ}/|I-J|\)

1.36

F8

1/|I ^′−I|

0.12

F9

1/|J ^′−J|

0.20

F10

\(N_{\textit {gap}}^{KL}\)

0.37

F11

\(N_{\textit {gap}}^{KL}/|K-L|\)

0.32

F12

1/|K ^′−K|

0.23

F13

1/|L ^′−L|

0.49

F14

\(\sum _{s=H,E,C} p(s)\delta (s_{I},s_{K})\)

0.16

F15

\(\sum _{s=H,E,C} p(s)\delta (s_{J},s_{L})\)

0.88

F16

\(\sum _{acc=B,E} p(acc)\delta (acc_{I},acc_{K})\)

0.53

F17

\(\sum _{acc=B,E} p(acc)\delta (acc_{J},acc_{L})\)

0.58

F18

F ₄ F ₁₄ F ₁₅ F ₁₆ F ₁₇

3.62

F19

\(\frac {F_{18}}{1+F_{6}+F_{10}}\)

3.02

F20

\(\frac {F_{19}}{1+F_{8}+F_{9}+F_{12}+F_{13}}\)

4.22