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Table 4 

Hyperparameters for the RBF, polynomial, and sigmoid kernels.

RBFpolynomialsigmoid
Function exp(−γ∥xixj2xiTxj + c) dtanhxiTxj + c)) 
 
Parameters free parameter γ: vary between 2−14 and 24, stepping by factor 4 
 (default = 3
 
 d: vary between 2 and 5 
 (default = 1/number of features
 
  c (constant trading off): fix to default of 0 
RBFpolynomialsigmoid
Function exp(−γ∥xixj2xiTxj + c) dtanhxiTxj + c)) 
 
Parameters free parameter γ: vary between 2−14 and 24, stepping by factor 4 
 (default = 3
 
 d: vary between 2 and 5 
 (default = 1/number of features
 
  c (constant trading off): fix to default of 0 
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