In such cases, we can make a comparison of the two sources of evidence using the cross-entropy. In Information retrieval Research, S.
The first distribution can be treated as a new source of the term distribution, while the coding of the term with the term distribution within the collection can be considered as the primary source.
Query Expansion The query expansion mechanism extracts the most informative terms from the top-returned documents as the expanded query terms.
DFR Models and Cross-Entropy A different interpretation of the gain-risk generating Formula 4 can be explained by the notion of cross-entropy. A probabilistic approach to automatic keyword indexing. This model can be used for tasks that require early precision. The DFR term weighting models follow a parameter-free approach in default.
This model can be used for classic ad-hoc tasks. A user can switch to the latter approach by setting parameter.
We possess two tests of randomness: Nevertheless, it may happen that different sources about the same information are available. In this expansion process, terms in the top-returned documents are weighted using a particular DFR term weighting model.
The logarithms are base e. Probabilistic models of indexing and searching. The definition of the cross-entropy relation of these two probabilities distribution is: This model can be used for tasks that require early precision [ 78 ] Recommended settings for various collection are provided in Example TREC Experiments.
University of Illinois Press, Urbana, Illinois, The logarithms are base 2. The term noiseless refers at the assumption of the theorem that there is no possibility of errors in transmitting words. Another provided weighting model is a derivation of the BM25 formula from the Divergence From Randomness framework.
PL2 Poisson model with Laplace after-effect and normalisation 2. This result is known under the name of the Noiseless Coding Theorem. Bernoulli-Einstein model with Bernoulli after-effect and normalisation 2.
A study of parameter tuning for term frequency normalization, in Proceedings of the twelfth international conference on Information and knowledge management, New Orleans, LA, USA, In general each source produces a different coding.
The Mathematical Theory of Communication. DFR models can be equivalently defined as the divergence of two probabilities measuring the amount of randomness of two different sources of evidence.Phd Thesis On Facebook phd thesis on facebook Phd Thesis On fresh-air-purifiers.com custom essays fresh-air-purifiers.com Writing Service Us fresh-air-purifiers.com my apa fresh-air-purifiers.comion essay helpA dissertation advancing an original point of composition, monograph, disquisition He was awarded his PhD for a thesis on industrial robots /10().
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