SVM feature and value pair

Hi,
I think I am a new comer here.
I am trying to use svm_light software. From the example, I can see that
the training data is in pairs. feature and value related to it. I have
a question about the value, how is the value computed? Is there a
special system to calculate the value ? In other words, how can I find
the value associated with the feature?

I will be very appreciated if someone has experiences on this.

Thanks
zhenyu

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