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Extension: 3-level model
3-level model
Whole collection model (Mc)
Specific-topic model; relevant-documents model (Mt)
Individual-document model (Md)
Relevance hypothesis
A request(query; topic) is generated from a specific-topic model { Mc, Mt}.
Iff a document is relevant to the topic, the same model will apply to the document.
It will replace part of the individual-document model in explaining the document.
The probability of relevance of a document
The probability that this model explains part of the document
The probability that the {Mc ,Mt ,Md } combination is better than the {Mc ,Md } combination
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