Web search is the quintessential large-data problem. Given an information need expressed as a short query consisting of a few terms, the system s task is to retrieve relevant web objects (web pages, PDF documents, PowerPoint slides, etc.) and present them to the user. How large is the web? It is dicult to compute exactly, but even a conservative estimate would place the size at several tens of billions of pages, totaling hundreds of terabytes (considering text alone). In real-world applications, users demand results quickly from a search engine|query latencies longer than a few hundred milliseconds will try a user s patience. Fullling these requirements is quite an engineering feat, considering the amounts of data involved!

Inverted Indexing for Text retrieval.pdf

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