The range of values we select from is: C ∈ 10 −3 , 10 −2 , 10 −1 , 1, 10, 10 2 , 10 3 and γ ∈ 2 −6 , 2 −5 , 2 −4 , ..., 2 4 , 2 6 and for each possible value we perform five-fold cross validation.
we ran the algorithm five times for the 91 = 7 × 13 parameter settings.