In many pattern classification problems óné pattern to one of c classes, or to reject it as being unrecognizable. If the cost for rejects is not too high, rejection may be a desirable action. Let i, j = 1, ..., c i = j i =c+1 otherwise, %3D

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1. Duda, problem 2.13.
Secion 4.4
13. In many pattern classification problems one has the option either to assign the
pattern to one of c classes, or to reject it as being unrecognizable. If the cost for
rejects is not too high, rejection may be a desirable action. Let
i, j = 1,..., c
{
i = j
i =c+1
otherwise,
%3D
where , is the loss incurred for choosing the (c + 1)th action, rejection, and
is the loss incurred for making any substitution error. Show that the minimum
risk is obtained if we decide wi if P (w,\x) > P(wj|x) for all j and if P(@\x) Z
1- 1,/A,, and reject otherwise. What happens if 2, = 0? What happens if
1, > 1,?
%3D
Transcribed Image Text:1. Duda, problem 2.13. Secion 4.4 13. In many pattern classification problems one has the option either to assign the pattern to one of c classes, or to reject it as being unrecognizable. If the cost for rejects is not too high, rejection may be a desirable action. Let i, j = 1,..., c { i = j i =c+1 otherwise, %3D where , is the loss incurred for choosing the (c + 1)th action, rejection, and is the loss incurred for making any substitution error. Show that the minimum risk is obtained if we decide wi if P (w,\x) > P(wj|x) for all j and if P(@\x) Z 1- 1,/A,, and reject otherwise. What happens if 2, = 0? What happens if 1, > 1,? %3D
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