Information retrieval Information retrieval is the activity of obtaining information resources relevant to an information need from a collection of information resources. Searches can be based on metadata or on full-text (or other content-based) indexing. Automated information retrieval systems are used to reduce what has been called "information overload". Many universities and public libraries use IR systems to provide access to books, journals and other documents. Web search engines are the most visible IR applications. Overview[edit] An information retrieval process begins when a user enters a query into the system. An object is an entity that is represented by information in a database. Most IR systems compute a numeric score on how well each object in the database matches the query, and rank the objects according to this value. History[edit] Model types[edit] For effectively retrieving relevant documents by IR strategies, the documents are typically transformed into a suitable representation. Recall[edit]
Elasticsearch: Getting Started Elasticsearch is on a mission to organize data and make it easily accessible. In this webinar, we plan to provide a solid foundation on using Elasticsearch. By the end of the webinar, you should have an understanding of what Elasticsearch is capable of, how to implement basic functionality, and where to find more resources. Hosted Elasticsearch with Elastic Cloud 14 day trial. This webinar will cover: Downloading, prerequisites, and running Elasticsearch Adding, updating, retrieving and deleting data through CRUD REST APIs Basic text analysis, including tokenization and filtering Basic search queries Aggregations: the faceting and analytics workhorse of Elasticsearch Additional Resources: Running an older version of Elasticsearch? Watch Getting Started with Elasticsearch 1.7
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API In computer programming, an application programming interface (API) specifies how some software components should interact with each other. Detailed explanation[edit] API in procedural languages[edit] In most procedural languages, an API specifies a set of functions or routines that accomplish a specific task or are allowed to interact with a specific software component. This specification is presented in a human readable format in paper books, or in electronic formats like ebooks or as man pages. The Unix command man 3 sqrt presents the signature of the function sqrt in the form: SYNOPSIS #include <math.h> double sqrt(double X); float sqrtf(float X); DESCRIPTION sqrt computes the positive square root of the argument. ... This description means that sqrt() function returns the square root of a positive floating point number (single or double precision), as another floating point number. $ perldoc -f sqrt sqrt EXPR sqrt #Return the square root of EXPR. API in object-oriented languages[edit]
A brief introduction to Search Engines Search Engines- Helping us since ages! There are thousands of millions of pages on the web, all ready to present the information on a variety of interesting and amusing topics. The Search Engines are the messengers of the same information at your disposal whenever you need them. Well, the bad news is that there are thousands of millions of pages ready to fool you with inaccurate information shaped by the whim and fancy of the author. What exactly are Search Engines? Well, if you go by the technical definition as quoted by Wikipedia:“A web search engine is a software system that is designed to search for information on the World Wide Web. Concept of SERPs: SERPs is simply an acronym for Search Engine Result Pages. I had entered ‘does jogging help you lose weight’ (Because I guess this inhibition is plaguing everybody) and the Search Engines come back with a list of websites as shown in the screenshot. Are you aware of the top 15 Search Engines? Google- 1,100,000,000 visitors.
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