Suppose there are C classes, and the i-th class has Ni
number of training examples. Let Cost[i, c] (i, c ∈ {1..C})
denote the cost of misclassifying an example of the i-th class to
the c-th class (Cost[i, i] = 0), and Cost[i] (i ∈ {1..C}) denote
the cost of the i-th class. Moreover, suppose the classes are
ordered such that for the i-th class and the j-th class, if i < j
then (Cost[i] < Cost[j]) or (Cost[i] = Cost[j] and Ni ≥
Nj ). Cost[i] is usually derived from Cost[i, c]. There are
many possible rules for the derivation, among which a popular
one is Cost[i] = P
C
c=1
Cost[i, c]
Suppose there are C classes, and the i-th class has Ninumber of training examples. Let Cost[i, c] (i, c ∈ {1..C})denote the cost of misclassifying an example of the i-th class tothe c-th class (Cost[i, i] = 0), and Cost[i] (i ∈ {1..C}) denotethe cost of the i-th class. Moreover, suppose the classes areordered such that for the i-th class and the j-th class, if i < jthen (Cost[i] < Cost[j]) or (Cost[i] = Cost[j] and Ni ≥Nj ). Cost[i] is usually derived from Cost[i, c]. There aremany possible rules for the derivation, among which a popularone is Cost[i] = PCc=1Cost[i, c]
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