پاورپوینت کامل Modern Information Retrieval 47 اسلاید در PowerPoint

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پاورپوینت کامل Modern Information Retrieval 47 اسلاید در PowerPoint

اسلاید ۴: Purposes of the CourseTo impart a basic theoretical understanding of IR models Boolean Vector SpaceProbabilistic (including Language Models)To examine major application areas of IR including:Web SearchText categorization and clusteringCross language retrievalText summarizationDigital LibrariesMarjan Ghazvininejad4Sharif University Spring 2012

اسلاید ۵: Purposes of the Course …To understand how IR performance is measured:Recall/PrecisionStatistical significanceGain hands-on experience with IR systemsMarjan Ghazvininejad5Sharif University Spring 2012

اسلاید ۶: Lecture OverviewIntroduction to the CourseIntroduction to Information RetrievalThe Information Seeking ProcessInformation Retrieval History and DevelopmentsDiscussionReferencesMarjan Ghazvininejad6Sharif University Spring 2012

اسلاید ۷: IntroductionGoal of IR is to retrieve all and only the “relevant” documents in a collection for a particular user with a particular need for informationRelevance is a central concept in IR theoryHow does an IR system work when the “collection” is all documents available on the WebWeb search engines are stress-testing the traditional IR modelsMarjan Ghazvininejad7Sharif University Spring 2012

اسلاید ۸: Information RetrievalThe goal is to search large document collections (millions of documents) to retrieve small subsets relevant to the user’s information need Examples are:Internet search enginesDigital library cataloguesMarjan Ghazvininejad8Sharif University Spring 2012

اسلاید ۹: Information Retrieval …Some application areas within IRCross language retrievalSpeech/broadcast retrievalText categorizationText summarizationSubject to objective testing and evaluationhundreds of queriesmillions of documents Marjan Ghazvininejad9Sharif University Spring 2012

اسلاید ۱۰: OriginsCommunication theory revisitedProblems with transmission of meaningNoiseSourceDecodingEncodingDestinationMessageMessageChannelStorageSourceDecoding(Retrieval/Reading)Encoding(writing/indexing)DestinationMessageMessageMarjan Ghazvininejad10Sharif University Spring 2012

اسلاید ۱۱: Components of an IR SystemDocumentsAuthoritativeIndexing RulesIndexing Process Index Records &Document SurrogatesRetrieval ProcessRetrieval Rules User’s Information Need QuerySpecification ProcessQueryList of DocumentsRelevant to User’sInformation NeedMarjan Ghazvininejad11Sharif University Spring 2012Severe Information Loss

اسلاید ۱۲: Lecture OverviewIntroduction to the CourseIntroduction to Information RetrievalThe Information Seeking ProcessInformation Retrieval History and DevelopmentsDiscussionReferencesMarjan Ghazvininejad12Sharif University Spring 2012

اسلاید ۱۳: Review: Information Overload“The worlds total yearly production of print, film, optical, and magnetic content would require roughly 1.5 billion gigabytes of storage. This is the equivalent of 250 megabytes per person for each man, woman, and child on earth.” (Varian & Lyman)“The greatest problem of today is how to teach people to ignore the irrelevant, how to refuse to know things, before they are suffocated. For too many facts are as bad as none at all.” (W.H. Auden)Marjan Ghazvininejad13Sharif University Spring 2012

اسلاید ۱۴: The Standard Retrieval Interaction ModelMarjan Ghazvininejad14Sharif University Spring 2012

اسلاید ۱۵: Standard Model of IRAssumptions:The goal is maximizing precision and recall simultaneouslyThe information need remains staticThe value is in the resulting document setMarjan Ghazvininejad15Sharif University Spring 2012

اسلاید ۱۶: Problems with Standard ModelUsers learn during the search process:Scanning titles of retrieved documentsReading retrieved documentsViewing lists of related topics/thesaurus termsNavigating hyperlinksSome users don’t like long (apparently) disorganized lists of documentsMarjan Ghazvininejad16Sharif University Spring 2012

اسلاید ۱۷: IR is an Iterative ProcessRepositoriesWorkspaceGoalsMarjan Ghazvininejad17Sharif University Spring 2012

اسلاید ۱۸: IR is a DialogThe exchange doesn’t end with first answerUsers can recognize elements of a useful answer, even when incompleteQuestions and understanding changes as the pr