Storage Retrieval

Download Language Modeling for Information Retrieval by W. Bruce Croft, John Lafferty PDF

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By W. Bruce Croft, John Lafferty

A statisticallanguage version, or extra easily a language version, is a prob­ abilistic mechanism for producing textual content. Such adefinition is common adequate to incorporate an unending number of schemes. even though, a contrast might be made among generative types, which could in precept be used to synthesize man made textual content, and discriminative concepts to categorise textual content into predefined cat­ egories. the 1st statisticallanguage modeler was once Claude Shannon. In exploring the appliance of his newly based concept of data to human language, Shannon thought of language as a statistical resource, and measured how weH uncomplicated n-gram versions anticipated or, equivalently, compressed average textual content. to do that, he predicted the entropy of English via experiments with human topics, and in addition envisioned the cross-entropy of the n-gram types on traditional 1 textual content. the power of language types to be quantitatively evaluated in tbis approach is one in every of their vital virtues. after all, estimating the real entropy of language is an elusive objective, aiming at many relocating objectives, due to the fact language is so diverse and evolves so quick. but fifty years after Shannon's learn, language versions stay, by means of all measures, faraway from the Shannon entropy liInit by way of their predictive strength. even though, tbis has no longer saved them from being invaluable for quite a few textual content processing projects, and in addition may be considered as encouragement that there's nonetheless nice room for development in statisticallanguage modeling.

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3 English processing. Prior to any experiments, each dataset was processed as follows. Both documents and queries were tokenized on whitespace and punctuation characters. Tokens with fewer than two characters were discarded. , 2001) stemmer, which combines morphological mIes with a large dictionary of special cases and exceptions. , 2001) stop-list were removed. All of the remaining tokens were used for indexing, and no other form of processing was used on either the queries or the documents. 4 Chinese Resources.

Without experimental evidence, it would be difficult to guess which ranking prineiple would perform better. Is it preferable to favor a few highly-relevant words, as done by the probability ratio, or many possiblyrelevant words, as favored by cross-entropy? 7 suggest that rankings based on cross-entropy are noticeably better. However, it is important to realize that our experiments do not contradict the arguments of Robertson (Robertson, 1977), and do not diminish the importance ofthe probability ranking prineiple.

We used query number 58 from the cross-language retrieval task of TREC-9. The English query was: "environmental protection laws". We show 20 tokens with highest probability under the model. It is evident that many stop-words and punctuation characters are assigned high probabilities. This is not surprising, since these characters were not removed during pre-processing, and we naturally expect these characters to occur frequently in the documents that discuss any topic. However, the model also assigns high probabilities to words that one would consider highly relevant to the topic of environmental protection.

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