machine-learning - liblinear one vs rest learn parameters

Question

Liblinear (http://www.csie.ntu.edu.tw/~cjlin/liblinear/) does not support for probability estimates.

Say I have three classes C1, C2 and C3. I want to learn the model paramters for each 'one vs rest' cases:

           C1 vs C2&C3, 
           c2 vs C1&C3 and
           C3 vs C1&C2

How can I do it?

Answer 1

在 lr 中，对于 -b 1 参数，它实际上并没有给出 p(c1) 值。它给

P(c1)=p(c1)/(p(c1)+p(c2)+p(c3)) 

在输出文件中。因此，当您只有 1 个类时，它会输出 1。