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ex7_slides - CS221 Discussion Section November 15, 2007...

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Unformatted text preview: CS221 Discussion Section November 15, 2007 November 15, 2007 1 Bayes Ball: A different view Variable type From Parent From Child Unobserved Passes through to children Passes through and bounces back to children Observed Bounces back to parents Blocks balls Visit to Asia Smoking Tuberculosis Lung Cancer Bronchitis Abnormality in Chest X-ray Dyspnea November 15, 2007 2 Variable elimination P (V )P (T | V )P (S )P (L | S )P (B | S ) P (A | L, T )P (X | A)P (D | A, B ) P (D ) = A,B,L,T,S,X,V November 15, 2007 3 Naive Bayes log(P (d1)) − log(P (d0)) + i log(P (xi | d1)) − log(P (xi | d0)) > 0 w0 = log(P (d1)) − log(P (d0)) + i log(P (x0 | d1)) − log(P (x0 | d0)) i i wi = log(P (x1 | d1)) − log(P (x1 | d0)) − (log(P (x0 | d1)) − log(P (x0 | d0))) i i i i November 15, 2007 4 ...
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This note was uploaded on 11/30/2009 for the course CS 221 taught by Professor Koller,ng during the Winter '09 term at Stanford.

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ex7_slides - CS221 Discussion Section November 15, 2007...

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