Problem with Precision floating point operation in C

Question

For one of my course project I started implementing \"Naive Bayesian classifier\" in C. My project is to implement a document classifier application (especially Spam) using huge

Answer 1

This happens often in machine learning. AFAIK, there's nothing you can do about the loss in precision. So to bypass this, we use the log function and convert divisions and multiplications to subtractions and additions, resp.

SO I decided to do the math,

The original equation is:

I slightly modify it:

Taking logs on both sides:

Let,

Substituting,

Hence the alternate formula for computing the combined probability:

If you need me to expand on this, please leave a comment.