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Project Description 3 Latent Semantic Index

Project Description 3 Latent Semantic Index. Compute TFIDF(token_i, document_j) = TF( ti ; dj) log |Tr |/|Tr(ti)| The token in each file is sorted and attached the TFIDF value. TFIDF. 1. Tr ( ti )= the # of documents in Tr in which ti occurs at least once,

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Project Description 3 Latent Semantic Index

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  1. Project Description 3Latent Semantic Index

  2. Compute TFIDF(token_i, document_j) = TF(ti; dj)log |Tr|/|Tr(ti)| The token in each file is sorted and attached the TFIDF value

  3. TFIDF 1. Tr(ti)= the # of documents in Tr in which ti occurs at least once, =1 +log(N(ti; dj))if N(ti; dj)> 0 2. TF(ti; dj)  =0 otherwise 3. N(ti, dj) = the frequency(# OF OCCURRENCES OF ti / # OF TOKENs indj of ti in dj.

  4. Important point about Token • TFIDF(token_i, document_j) = tf(ti; dj)log |Tr|/|Tr(ti)| Correction(only consider (threshold2??) >=|Tr(ti)| >= threshold1 Discuss come properties about this numerical values (Tr set of the documents; Tr(ti) the set of documents containing ti)

  5. LSI example

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