Download e-book for iPad: Mastering Information Retrieval and Probabilistic Decision by Daniel Brown (Auth.)

By Daniel Brown (Auth.)

ISBN-10: 1843340798

ISBN-13: 9781843340799

Aimed toward details managers in enterprises together with local/state executive, libraries and fiscal prone. getting to know info Retrieval and Probabilistic determination Intelligence expertise stories the administration of data and its concentration to humans empowered to make judgements. It offers managers and scholars of knowledge with the assets to appreciate and begin to install info retrieval platforms all through their employer and the instruments to reply successfully to the big advancements in new technologies.

  • Written through knowledgeable practitioner within the field
  • Helps to summarise and clarify the elemental issues
  • Covers either merits and demanding situations more likely to be encountered in enforcing a data Retrieval system

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Extra info for Mastering Information Retrieval and Probabilistic Decision Intelligence Technology

Example text

2. See Glossary. 3. In fact it is a particular type of law called a scale-free or power law (with an exponent of 1) where the scale is invariant no matter what level it is looked at. 53 5 The sea of data The available data include documents, PowerPoints, e-mails, books, articles, news feeds, product offers, TV programmes, music, advertisements, voicemails, phone calls: we are deluged by information – and most of it is irrelevant or distracting to our needs of the moment. By way of example, in 1998 there were 440 million pages of information on the Web.

Calculate a weight for each index word in the document. 3. Index words not in the document get zero weight. 4. These weights give us a vector which we use to represent the document. We can then represent the query as a vector where relevant documents are likely to point in the same direction as the query. One simple score is defined as the dot product (a vector multiplication) of the vectors: Then (q · d) is 0 if q and d are perpendicular Maximum if q and d point in the same direction In a 3D example this is simply score = q1 * d1 + q2 * d2 + q3 * d3.

In many practical purposes, however, it is impossible to predict in advance the exact outcome of applying an arbitrary action to an arbitrary state. These methods enable us to learn about individual people’s preferences and to classify textual documents. Having discussed these learning techniques, we can also look at some straightforward mechanics for document indexing and retrieval. Since information retrieval operates on textual documents, we should note some features of text itself. A notable text heuristic is Zipf’s Law which states that the i th most frequent word occurs with frequency Constant/i.

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Mastering Information Retrieval and Probabilistic Decision Intelligence Technology by Daniel Brown (Auth.)

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