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Old 06-10-2013, 06:08 AM
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yaser yaser is offline
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Join Date: Aug 2009
Location: Pasadena, California, USA
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Default Re: Failed to find the bias term for Q15

Quote:
Originally Posted by skwong View Post
For Q15, I coded to find the K centers for the RBF. Then use pseudo-inverse to find the w_k. Then have difficulty to find the b. I think it should be calculated by picking any point, and substitute into the formula for x and y:

y - \sum_{k=1}^{K}w_k exp(-\gamma \|x - \mu_{k}\|^2)

But, when I try it for all 100 points, all calculated b are different. Am I mis-understand something ? Or simply my program bug ? I read through all posts in the forum but cannot figure out any hints.
bargava is correct. This was discussed in a post that is buried in another thread:

http://book.caltech.edu/bookforum/sh...40&postcount=7
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