Yousef Saad Department Of Computer Science And Engineering
Yousef Saad Department Of Computer Science And Engineering
Yousef Saad Department Of Computer Science And Engineering
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Common approach: Use the SVD<br />
➤ Need to extract intrinsic information – or underlying “semantic”<br />
information –<br />
➤ LSI: replace A by a low rank approximation [from SVD]<br />
A = UΣV T → Ak = UkΣkV T<br />
k<br />
➤ Uk : term space, Vk: document space.<br />
➤ New similarity vector: sk = A T k q = VkΣkU T k<br />
➤ Main issues: 1) computational cost 2) Updates<br />
CSE Colloquium 11/09/09 p. 45
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