Substring indices | Search algorithms

Inverted index

In computer science, an inverted index (also referred to as a postings list, postings file, or inverted file) is a database index storing a mapping from content, such as words or numbers, to its locations in a table, or in a document or a set of documents (named in contrast to a forward index, which maps from documents to content). The purpose of an inverted index is to allow fast full-text searches, at a cost of increased processing when a document is added to the database. The inverted file may be the database file itself, rather than its index. It is the most popular data structure used in document retrieval systems, used on a large scale for example in search engines. Additionally, several significant general-purpose mainframe-based database management systems have used inverted list architectures, including ADABAS, DATACOM/DB, and Model 204. There are two main variants of inverted indexes: A record-level inverted index (or inverted file index or just inverted file) contains a list of references to documents for each word. A word-level inverted index (or full inverted index or inverted list) additionally contains the positions of each word within a document. The latter form offers more functionality (like phrase searches), but needs more processing power and space to be created. (Wikipedia).

Video thumbnail

Overview of inverses

πŸ‘‰ Learn how to find the inverse of a linear function. A linear function is a function whose highest exponent in the variable(s) is 1. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that whe

From playlist Find the Inverse of a Function

Video thumbnail

Learn how to identify the inverse of a function and graph

πŸ‘‰ Learn how to find the inverse of a linear function. A linear function is a function whose highest exponent in the variable(s) is 1. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that whe

From playlist Find the Inverse of a Function

Video thumbnail

How does the graph of a function compare to it's inverse

πŸ‘‰ Learn how to find the inverse of a linear function. A linear function is a function whose highest exponent in the variable(s) is 1. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that whe

From playlist Find the Inverse of a Function

Video thumbnail

Learn how to find inverse of a function and determine if the inverse is a function or not

πŸ‘‰ Learn how to find the inverse of a linear function. A linear function is a function whose highest exponent in the variable(s) is 1. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that whe

From playlist Find the Inverse of a Function

Video thumbnail

Crash Course IR - Fundamentals

In this lecture we explore two fundamental building blocks of information retrieval (IR): indexing and ranked retrieval with TF-IDF and BM25 scoring models. Slides & transcripts are available at: https://github.com/sebastian-hofstaetter/teaching πŸ“– Check out Youtube's CC - we added our hig

From playlist Advanced Information Retrieval 2021 - TU Wien

Video thumbnail

Finding the inverse of a function- Free Online Tutoring

πŸ‘‰ Learn how to find the inverse of a linear function. A linear function is a function whose highest exponent in the variable(s) is 1. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that whe

From playlist Find the Inverse of a Function

Video thumbnail

How to find the inverse of a linear equation domain and range

πŸ‘‰ Learn how to find the inverse of a linear function. A linear function is a function whose highest exponent in the variable(s) is 1. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that whe

From playlist Find the Inverse of a Function

Video thumbnail

Inverse of a linear equation with fraction

πŸ‘‰ Learn how to find the inverse of a linear function. A linear function is a function whose highest exponent in the variable(s) is 1. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that whe

From playlist Find the Inverse of a Function

Video thumbnail

Zhizhang Xie: A relative index theorem for incomplete manifolds and Gromov’s conjectures on PSC

Talk by Zhizhang Xie in the Global Noncommutative Geometry Seminar (Americas) https://globalncgseminar.org/talks/a-relative-index-theorem-for-incomplete-manifolds-and-gromovs-conjectures-on-positive-scalar-curvature/ on May 7, 2021.

From playlist Global Noncommutative Geometry Seminar (Americas)

Video thumbnail

Use the inverse of a function to determine the domain and range

πŸ‘‰ Learn how to find the inverse of a linear function. A linear function is a function whose highest exponent in the variable(s) is 1. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that whe

From playlist Find the Inverse of a Function

Video thumbnail

DjangoCon 2014- From __icontains to search

By, Honza KrΓ‘l Good search experience for your users is about more than just a more efficient way to find models containing certain word or phrase. In this talk we'll go through what are the relevant parts of search and how to best implement them (we'll use Elasticsearch for actual example

From playlist DjangoCon 2014

Video thumbnail

Guoliang Yu - The Novikov conjecture and scalar curvature

I will discuss some connections between the Novikov conjecture and scalar curvature. Guoliang Yu (Texas A&M University)

From playlist Not Only Scalar Curvature Seminar

Video thumbnail

Guoliang Yu: Higher invariants in noncommutative geometry

Talk by Guoliang Yu in Global Noncommutative Geometry Seminar (Europe) http://www.noncommutativegeometry.nl/ncgseminar/ on November 30, 2020

From playlist Global Noncommutative Geometry Seminar (Europe)

Video thumbnail

Indexing 12: expected cost of execution

We compare three different ways to match a set of queries to a set of documents in terms of their expected computational cost: brute-force, index with doc-at-a-time and index with term-at-a-time.

From playlist IR7 Inverted Indexing

Video thumbnail

How to find the inverse of a linear function

πŸ‘‰ Learn how to find the inverse of a linear function. A linear function is a function whose highest exponent in the variable(s) is 1. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that whe

From playlist Find the Inverse of a Function

Video thumbnail

How to find the inverse of a linear function

πŸ‘‰ Learn how to find the inverse of a linear function. A linear function is a function whose highest exponent in the variable(s) is 1. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that whe

From playlist Find the Inverse of a Function

Related pages

Document retrieval | Search engine indexing | Bitmap index | Phrase search