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Multiclass classification
Multiclass classification is the machine learning task of assigning each input instance to exactly one of three or more classes, extending binary classification; common strategies include one-vs-rest and one-vs-one.
Multicore fiber
Multicore fiber is an optical fiber in which multiple independent light-guiding cores sit within a single cladding, letting one fiber carry parallel data paths; it underpins space-division multiplexing and submarine-cable capacity records.
Multicoset sampling
Multicoset sampling, also called periodic nonuniform sampling, is a sub-Nyquist technique that retains only some Nyquist-grid samples, allowing reconstruction of sparse multiband signals like radio transmissions.
Multics
Multics, the Multiplexed Information and Computing Service, was a mainframe time-sharing operating system begun in 1964 by MIT, Bell Labs, and General Electric, and the origin from which Unix was created.
Multidimensional multiplexing
Multidimensional multiplexing is the simultaneous use of more than two dimensions of light, such as time, wavelength, polarization, space, and quadrature, to carry data through one optical channel.
Multidimensional scaling
Multidimensional scaling (MDS), also called principal coordinates analysis, is a family of statistical techniques that represents objects as points in a low-dimensional space whose distances match pairwise dissimilarities.
Multidisciplinary design optimization
Multidisciplinary design optimization (MDO) is a computational engineering method that optimizes a complex system's design by coupling several disciplines, such as aerodynamics and structures, in one problem.
Multiferroic tunnel junction
A magnetoelectric multiferroic tunnel junction (MFTJ) is a nanoscale device in which a ferroelectric barrier sits between two ferromagnetic electrodes, giving four distinct resistance states.
MultiGP
MultiGP (short for Multirotor Grand Prix) is a grassroots drone racing league founded in 2015 by Chris Thomas. It claims over 30,000 registered pilots and 500 chapters worldwide.
Multihull
A multihull is a boat with more than one hull, most commonly a catamaran with two hulls or a trimaran with three, gaining stability from beam rather than ballast.
Multijunction solar cell
A multijunction solar cell is a photovoltaic device that stacks several semiconductor junctions, each tuned to a different part of the solar spectrum, reaching record efficiencies above 45%.
Multilateration
Multilateration is a positioning technique that determines an object's location from time-based signal measurements at multiple stations, notably used for air traffic surveillance of aircraft.
Multilayer insulation (cryogenics)
Multilayer insulation, also called superinsulation, is a thermal insulation system of many reflective shields separated by spacers under high vacuum, used on spacecraft, cryogenic transfer lines, and liquid hydrogen storage.
Multilayer perceptron
A multilayer perceptron (MLP) is a feedforward neural network whose units compute weighted sums plus biases through nonlinear activations, trained by backpropagation; it is the quintessential deep learning model.
Multilevel feedback queue
The multilevel feedback queue (MLFQ) is a CPU scheduling algorithm that moves processes between priority queues by observed behavior, demoting CPU-bound jobs and boosting interactive ones.
Multilevel inverter
A multilevel inverter is a power converter that combines several DC voltage levels into a stepped AC waveform with lower harmonic distortion than a conventional two-level inverter.
Multilingual BERT
Multilingual BERT, or mBERT, is a single BERT model pretrained by Google on Wikipedia text in 104 languages with no cross-lingual signal, released in late 2018.
Multilingual jailbreak
A multilingual jailbreak is an attack on a large language model that phrases harmful requests in low-resource languages, exploiting safety training concentrated in English, with defenses including English-proxy prompting.
Multilingual LibriSpeech
Multilingual LibriSpeech (MLS) is an open-source corpus of transcribed read speech released by Facebook AI in 2021, containing over 50,000 hours of LibriVox audiobook audio in eight languages.
Multilingual pretraining corpora
Multilingual pretraining corpora are web-scale text collections that give foundation models training signal in languages other than English, built by filtering and deduplicating web crawls; open examples include MADLAD-400, CulturaX, HPLT, and mOSCAR.
Multilink suspension
Multilink suspension is a form of independent vehicle suspension that locates each wheel with several separate links rather than one or two large arms, giving engineers fine control over ride and handling.
Multimedia
Multimedia, also called digital multimedia, is the integrated, interactive use of text, images, audio, video, and animation in one digital system, supported by standards like MPEG.
Multimedia Messaging Service
Multimedia Messaging Service (MMS), also called picture message, is a standard mobile messaging service for exchanging pictures, video, audio, and text, extending SMS over cellular networks.
Multimedia over Coax Alliance
The Multimedia over Coax Alliance (MoCA) is a non-profit standards consortium founded in 2004 that develops and certifies specifications for multi-gigabit home and access networking over existing coaxial cable.
MultiMediaCard
The MultiMediaCard, or MMC card, is a removable flash memory card introduced by SanDisk and Siemens in November 1997; it was among the smallest flash cards of its time.
Multimeter
A multimeter, also called a volt-ohm meter, is an electronic test instrument that measures voltage, current, and resistance in one device; most modern meters are digital.
Multimodal contrastive learning
Multimodal contrastive learning is a machine learning approach that aligns embeddings of paired data, such as images and text, prominent through CLIP and ALIGN in 2021.
Multimodal Diffusion Transformer
The Multimodal Diffusion Transformer (MMDiT) is a transformer denoiser architecture introduced with Stable Diffusion 3 in 2024, replacing the U-Net with separate text and image weight streams.
Multimode optical fiber
Multimode optical fiber is optical fiber with a large core, typically 50 or 62.5 µm, that guides many light paths over short distances such as data center links.
Multimodulus algorithm
The multimodulus algorithm (MMA) is a blind adaptive equalization algorithm introduced in 2002 that removes inter-symbol interference and recovers the carrier phase of QAM signals.