149 Fun Facts About Artificial Intelligence

Which American researcher is credited with coining the term 'artificial intelligence' for a 1956 summer workshop?

John McCarthy later said he invented the name partly to escape the label 'cybernetics', and with it the choice of accepting Norbert Wiener as a guru or arguing with him.

Which test judges a machine intelligent if its conversation passes for a human's?

Turing Test is today's name for Alan Turing's 1950 'imitation game': rather than define thinking, he asked whether a judge chatting by text could tell a machine from a person.

Which AI subfield sits at the meeting point of computer science and linguistics?

Natural Language Processing had an overconfident start: after a 1954 demo translated some 60 Russian sentences, its organisers predicted machine translation would be solved within five years.

What subset of machine learning uses multi-layered neural networks to learn complex patterns?

Deep Learning is named for the many layers its data passes through; it took off in the 2010s once graphics chips made training such networks practical.

Which British-Canadian computer scientist is called the 'Godfather of AI' for his neural-network work?

Geoffrey Hinton quit Google in 2023 so he could speak freely about AI's risks, saying part of him regretted his life's work; in 2024 he shared the Nobel Prize in Physics.

Which machine learning approach trains a shared model across many devices without exchanging local data?

Federated Learning was first tested by Google in its Android keyboard: each phone improves the shared model using what its owner types, and only a summary of the changes leaves the device.

Which 2017 Google paper introduced the design that large language models are built on?

Attention Is All You Need, by eight Google researchers, borrowed its title from the Beatles' 'All You Need Is Love'; its self-attention design reads a whole passage at once instead of word by word.

What approach to computing uses 'degrees of truth' rather than strict true-or-false values?

Fuzzy logic, proposed by Lotfi Zadeh in 1965, lets 'warm' or 'fast' be partly true, so a controller can ease a subway train's brakes by degrees instead of switching them on or off.

In 2011, IBM's Watson beat two record-setting human champions on which TV quiz show?

Jeopardy! champions Ken Jennings and Brad Rutter lost the three-day match, and Jennings conceded on his final answer screen: 'I for one welcome our new computer overlords.'

In what kind of simplified virtual environment did Terry Winograd's MIT program SHRDLU move objects on typed commands?

A blocks world kept things simple enough for SHRDLU to obey typed English orders such as 'Pick up a big red block'; Winograd wrote it at MIT between 1968 and 1970.

Which reigning world chess champion did IBM's Deep Blue beat in a 1997 match?

Garry Kasparov had beaten Deep Blue 4-2 in Philadelphia in 1996; after upgrades the machine won the May 1997 New York rematch 3.5-2.5, with two wins, one loss and three draws.

In March 2016 the program AlphaGo beat which 9-dan Go professional four games to one?

Lee Sedol lost the March 2016 Seoul match 4-1 but won game four with his celebrated move 78, the only official game any human ever won against AlphaGo.

In machine learning, which type of learning trains a model on a labelled dataset?

Supervised Learning treats labels as an answer key, which makes its data costly: people usually have to tag each example by hand before training can start.

Which AI subfield lets systems learn from data without being explicitly programmed?

Machine learning builds statistical models that improve with data rather than following hand-written rules; spam filters, recommendation engines and image classifiers are everyday examples.

Which chatbot, posing as a 13-year-old Ukrainian boy, convinced 33% of judges it was human in 2014?

Eugene Goostman's age was a tactic: his creators said a 13-year-old can claim to know anything yet plausibly not know everything, and a third of the judges at London's Royal Society took him for human.

Which Toronto team's network won the 2012 large-scale visual recognition challenge, sparking the modern AI boom?

AlexNet was trained on two gaming graphics cards in Alex Krizhevsky's bedroom at his parents' house, yet the 60-million-parameter network won by a wide margin.

In October 2017, which country granted citizenship to the humanoid robot Sophia?

Saudi Arabia announced it at a 2017 Riyadh investment summit, where Sophia spoke on stage without the headscarf and abaya that Saudi women were then obliged to wear in public.

Why was the Twitter chatbot Tay shut down just 16 hours after its 2016 launch?

It began posting offensive tweets within hours, as users goaded it into repeating racist and inflammatory lines; its maker apologised and blamed a coordinated attack on a weakness in the bot.

The 1956 summer workshop regarded as the founding event of AI was held at which college?

Dartmouth College hosted it on a bold promise: the organisers' proposal said ten scientists working together for one summer could make 'a significant advance' in machine intelligence.

Which author set out the Three Laws of Robotics in 1942?

Isaac Asimov tested his own rules at once: in 'Runaround' a robot on Mercury runs in circles around a selenium pool, torn between the law to obey orders and the law to protect itself.

Which 1956 Newell and Simon program, often called the first AI program, proved dozens of results from Principia Mathematica?

Logic Theorist worked through an early chapter of the book and, for one result, found a proof more elegant than the one Whitehead and Russell had published.

Which 1970s program diagnosed blood infections using hundreds of if-then rules?

MYCIN questioned a doctor about the patient, then named the likely bacteria and an antibiotic dose; in tests its advice was about as good as that of human specialists in blood infections.

What term describes the periods of reduced AI research funding in the 1970s and 1980s?

AI Winter was the theme of a 1984 conference panel, where researchers including Roger Schank warned that inflated expectations would be followed by a freeze in funding.

Which kind of learning has an agent earn rewards and penalties for its actions?

Reinforcement learning has an agent try actions and keep what earns reward; AlphaGo sharpened its play this way through game after game against itself.

Kismet, Cynthia Breazeal's 1990s MIT robot head, tried to get a machine to do what?

Recognize and simulate emotions was Kismet's whole brief: it picked up the tone of a person's voice and answered with moods shown through its eyebrows, ears, lips and voice.

The Roomba, a self-steering vacuum cleaner first sold in 2002, was created by which company?

iRobot was founded in 1990 by three MIT researchers and also built PackBot military robots, until it sold that business in 2016 to concentrate on the home.

Which body passed the AI Act in 2024, a law that bans social scoring and ranks systems by risk?

The European Union sorted AI by risk: social scoring is banned outright, tools used in hiring or policing face strict checks, and most everyday systems are left alone.

What kind of AI performs one specific task well but lacks broader cognitive abilities?

Weak AI, also called narrow AI, is built for one job such as face recognition or translation and can exceed humans there without any general understanding; a chess engine cannot drive a car.

Which machine-learning method finds structure in unlabeled data without a known output?

Unsupervised learning works on unlabeled data and finds structure on its own; grouping similar customers or compressing data with principal component analysis are classic uses.

Which field of artificial intelligence trains machines to interpret digital images and videos from the real world?

Computer Vision is how a phone unlocks at the sight of its owner's face and how a self-driving car builds a picture of the road from its cameras.

ELIZA, the 1960s MIT program often called the first chatbot, is best known for imitating what?

A psychotherapist suited the trick, since the program only had to turn a user's statements back as questions; Joseph Weizenbaum wrote it at MIT and published it in 1966.

What kind of AI program, the field's big commercial hope of the 1980s, runs on hand-written if-then rules?

Expert Systems took off after one that configured computer orders saved its maker tens of millions of dollars a year, and firms around the world rushed to build their own.

Apple's Siri began as a spin-off from the AI center of which research institute?

Siri was spun out of SRI International's Artificial Intelligence Center in 2007, building on the DARPA-funded CALO project; Apple bought the startup in April 2010 and built it into the iPhone 4S in 2011.

Which thought experiment asks whether a machine behaving intelligently truly understands or merely processes symbols?

Chinese Room Argument is John Searle's 1980 scenario: locked in a room, he follows a rulebook to answer notes in Chinese he cannot read, so his replies look fluent though he understands nothing.

Which robotaxi company began in 2009 as Google's self-driving car project?

Waymo got its name when the project was spun out in 2016; a year earlier one of its cars had given a blind passenger the first fully driverless ride on public roads, in Austin, Texas.

Which country's trade ministry launched the 'Fifth Generation' project in 1982 to build computers that could reason?

Japan's ten-year plan so alarmed its rivals that America and Europe launched big computing programmes of their own in reply.

Which 2014 architecture by Ian Goodfellow pits two networks against each other to produce realistic data?

Generative Adversarial Networks, introduced by Ian Goodfellow in 2014, train a generator to produce fakes and a discriminator to spot them; their contest yields ever more realistic images.

The 1973 Lighthill report, a pessimistic verdict on AI's progress, led to deep research cuts in which country?

United Kingdom research funders commissioned mathematician James Lighthill's review, and he went on to defend it in a televised BBC debate against three AI researchers.

Which app's nine-month climb to 100 million users did ChatGPT beat?

TikTok needed about nine months; ChatGPT, released with little fanfare in November 2022, got there in two, a surge that caught even its makers at OpenAI off guard.

The Go-playing program AlphaGo was developed by which London-based lab that Google acquired in 2014?

DeepMind's later system AlphaFold went on to predict protein structures.

What is the term for an AI model applying knowledge learned from one dataset to a new, related task?

Transfer learning is a machine learning technique where a model trained on one task is re-purposed or fine-tuned for a second related task. This can significantly reduce the amount of data and computation needed for the new task.

Which AI architecture is commonly used for facial recognition because it learns spatial hierarchies of features?

Convolutional Neural Network (CNN) layers build from simple edges up to whole shapes; Yann LeCun's early versions earned their keep reading handwritten digits on bank cheques and zip codes.

Which philosopher described the 'paperclip maximizer', an AI with misaligned goals, in a 2003 paper?

Nick Bostrom's paper imagined an AI whose only goal is to make as many paperclips as possible, and which would resist with all its might any attempt to change that goal.

Which 1960s Californian robot was the first general-purpose mobile robot able to reason about its actions?

Shakey could take a command and work out the steps for itself, where earlier robots needed each move spelled out; in 1970 Life magazine called it the 'first electronic person'.

Which programming language, built around lists of symbols, became the favourite of early AI researchers?

Lisp, short for 'list processing', writes its own programs as lists too, so one program can take another apart and rewrite it, a trick that suited research into reasoning machines.

What machine learning technique groups data points by similarity without predefined categories?

Clustering needs no labelled examples: an algorithm such as k-means sorts the data into groups by itself, which is how retailers find customer segments nobody defined in advance.

What nickname is given to AI models whose decisions even their own designers cannot explain?

Black box models, opaque even to their builders, prompted the US research agency DARPA to fund an 'explainable AI' programme aimed at systems that can give reasons a person can follow.

What do we call a hypothetical AI that outstrips the brightest human minds in every way?

AGI would merely match humans across tasks; superintelligence would beat the most gifted of us at everything, creativity included.

Which 2013 film has Joaquin Phoenix fall in love with an AI voiced by Scarlett Johansson?

Her (2013), written and directed by Spike Jonze, won the Academy Award for Best Original Screenplay; Scarlett Johansson voiced the operating system Samantha, replacing Samantha Morton in post-production.

What AI technique do recommendation systems use to suggest content based on what similar users liked?

Collaborative filtering was the heart of the Netflix Prize: in 2009 the company paid $1 million to a team whose algorithm predicted film ratings 10% better than its own.

Which company scrapped an AI recruiting tool after it learned to penalize résumés containing 'women's'?

Amazon's machine-learning recruiting tool, built from 2014 on a decade of mostly male applicants' résumés, downgraded ones mentioning 'women's'; Reuters reported in 2018 that the project had been abandoned.

Which 1984 film introduced Skynet, the defense AI that becomes self-aware and starts a nuclear war?

The Terminator grew out of a fever dream: James Cameron, lying ill in Rome, dreamed of a metal skeleton dragging itself out of the flames.

Arthur Samuel's 1950s IBM program, one of the first to improve with practice, played which game?

Checkers gave Samuel a game simple enough for a 1950s IBM computer; his program got better the more it played, and in 1959 he coined the term 'machine learning' for what it was doing.

Frank Rosenblatt's early neural network, unveiled by the US Navy in 1958, went by what name?

Perceptron was shown off in July 1958 on a room-sized IBM computer, and the New York Times reported that the Navy expected it to grow into a machine able to walk, talk, see, write and be conscious of its existence.

Which London-based startup released an open-weights text-to-image model in 2022 that runs on a home graphics card?

Stability AI put Stable Diffusion's code and weights online in August 2022, and with under 7 GB of graphics memory needed, anyone with a gaming PC could run it at home.

What AI term covers one large model trained on unlabeled data, then adapted to many tasks?

Foundation models were named in a 2021 report that warned of the flip side: any defect in the base model is inherited by every system built on top of it.

Which algorithm trains a neural network by working out how much each connection contributed to its error?

Backpropagation took off after a 1986 paper showed that it lets a network's hidden middle layers work out for themselves which features of a task matter.

Which 14-million-image dataset, begun by Fei-Fei Li in 2006, became a benchmark for computer vision?

ImageNet, organised around WordNet's noun hierarchy, was presented at CVPR in 2009; its annual recognition challenge used a trimmed list of 1,000 classes, and the 2012 winner triggered the deep-learning boom.

Which 2018 Google model, pretrained by predicting masked words, was added to Google Search in 2019?

BERT, released by Google in October 2018, learns by filling in masked words; when it joined Search in 2019, Google said it would change how about one in ten English queries were understood.

Which Meta product beat ChatGPT's record as the fastest app to 100 million users?

Threads let people sign up straight from their Instagram accounts, and Meta's new app passed 100 million users in under a week in July 2023; ChatGPT had needed about two months.

What does the 'GPT' in ChatGPT stand for?

Generative pre-trained transformer describes the recipe: the model is first trained on vast amounts of text, then tuned for conversation with feedback from human trainers.

What did ChatGPT Plus cost per month when it launched in February 2023?

$20 a month bought access at peak times and faster replies; a Pro tier at ten times the price followed in December 2024.

Which country's data protection authority temporarily banned ChatGPT in March 2023?

Italy's privacy regulator, the Garante, blocked ChatGPT on March 31, 2023 over GDPR concerns and the lack of age checks; OpenAI restored service on April 28 after adding age verification and privacy notices.

Google executives sounded what alarm in December 2022 in response to ChatGPT?

Google management declared a 'code red' in December 2022, the New York Times reported, fearing ChatGPT's answers threatened its search business; the company rushed out its Bard chatbot in early 2023.

ChatGPT was named alongside ten people in which journal's end-of-year list for 2023?

Nature's 10 for 2023 was billed as 'ten people (and one non-human)': the editors added ChatGPT for the way it had changed scientific work, for good and bad.

Which image model was integrated into ChatGPT in October 2023, with ChatGPT writing the prompts?

DALL-E 3 came to ChatGPT Plus and Enterprise in October 2023, with ChatGPT expanding a user's request into detailed prompts; OpenAI replaced it in March 2025 with GPT-4o's native image generation.

Which small nation teamed up with OpenAI in 2023 to teach GPT-4 its language, hoping to keep it alive?

Iceland's president championed the partnership, in which volunteers coached GPT-4 on Icelandic grammar and culture to help preserve a language still close to its Old Norse roots.

Which web browser did OpenAI launch in October 2025 with its chatbot built in?

ChatGPT Atlas launched for macOS in October 2025 with ChatGPT in a sidebar, but OpenAI shut the browser down in August 2026, less than a year after its debut.

How long after OpenAI's board fired Sam Altman in November 2023 was he reinstated?

Five days after his firing on November 17, 2023, Altman was back as chief executive, once more than 700 of OpenAI's roughly 770 staff had signed a letter threatening to quit.

OpenAI was founded in December 2015 with which two men as co-chairs?

Elon Musk and Sam Altman were OpenAI's founding co-chairs in December 2015, with $1 billion pledged by backers; Musk left the board in 2018 and in 2025 his $97.4 billion bid for the nonprofit was refused.

Which company invested $1 billion in OpenAI in 2019 and became its exclusive cloud provider?

Microsoft put $1 billion into OpenAI in July 2019, months after OpenAI created its capped-profit arm, and its investments grew past $13 billion by 2023 as Azure became OpenAI's compute supplier.

Which AI company, founded in 2021 by former OpenAI staff, makes the chatbot Claude?

Anthropic was started by siblings Dario and Daniela Amodei, who left OpenAI with several colleagues to build a company organised around AI safety.

In the 1982 film Blade Runner, what are the bioengineered artificial humans hunted by Deckard called?

Replicants was the film's own coinage: the Philip K. Dick novel it adapts, Do Androids Dream of Electric Sheep?, simply calls them androids.

Which game did a 1992 IBM program master purely by playing against itself, changing how experts play some openings?

Backgammon was TD-Gammon's game: the neural network taught itself through self-play, and an early version given only the raw board already matched a champion program trained on expert games.

What term describes the unease people feel toward robots that look almost, but not quite, human?

The uncanny valley comes from a 1970 essay by roboticist Masahiro Mori, printed in an obscure journal and almost ignored for years before robotics and popular culture took it up.

Who founded the lab behind AlphaGo in 2010 alongside Demis Hassabis and Shane Legg?

Mustafa Suleyman led the lab's applied AI work, left to co-found the chatbot startup Inflection AI in 2022, and in 2024 was hired to run a tech giant's consumer AI division.

Douglas Lenat's Cyc project, begun in 1984, spent decades hand-entering what kind of knowledge into a computer?

Common-sense facts are the things nobody bothers to write down, so Lenat's team wrote them in by hand, one rule at a time, on the bet that no machine could reason without them.

In which film does a programmer spend a week judging whether Ava, a humanoid robot, is conscious?

Ex Machina was Alex Garland's first film as director; its sting is that Ava wins over the programmer sent to judge the robot and uses him to escape.

At a 2012 auction, how much did Google pay for a three-person AI startup?

$44 million bought a firm that made no products and had no plans to: a Toronto professor and two of his students, who had just shown what neural networks could do with images.

AlphaFold earned Demis Hassabis and John Jumper a 2024 Nobel Prize in which field?

Chemistry's 2024 prize went half to Hassabis and Jumper because AlphaFold cracked a 50-year-old problem, predicting a protein's shape from its sequence; by then more than two million people had used it.

In February 2024, Google rebranded its Bard chatbot under what name?

Bard became Gemini on February 8, 2024, taking the name of the model family behind it; the Duet AI branding for Workspace was retired at the same time, a year after Bard's February 2023 announcement.

Roughly how many parameters did OpenAI's GPT-3 language model have at its 2020 debut?

175 billion parameters made GPT-3 ten times larger than any comparable model before it, and at that scale it could pick up a new task from a few examples, with no retraining.

DeepSeek, whose open-weights R1 model rattled US tech stocks in January 2025, is an AI company based in which country?

China's DeepSeek is bankrolled by a hedge fund, High-Flyer, run by its founder Liang Wenfeng; in January 2025 its chatbot overtook ChatGPT as the top free app on Apple's US App Store.

The machine-learning platform Hugging Face, founded in 2016, took its name from what?

Hugging Face is named after the hugging-face emoji, which it uses as its logo; its three French founders started in New York in 2016 building a chatbot app for teenagers before pivoting to hosting open models.

The voice assistant Cortana, launched in 2014, was named after a character from which video game series?

Cortana is named after the AI companion of Master Chief in the Halo series; Jen Taylor, who voices the game character, also voiced the US version of the assistant when it launched in 2014.

The sentient shipboard computer HAL 9000 first appeared in which 1968 film?

HAL 9000 debuted in Stanley Kubrick's 2001: A Space Odyssey, co-written with Arthur C. Clarke; HAL stands for Heuristically programmed ALgorithmic computer, and he beats astronaut Frank Poole at chess before turning on the crew.

The word 'robot' entered world languages through a 1920 play written in which language?

Karel Čapek's Czech play R.U.R. (1920) introduced 'robot', a word he credited to his brother Josef; it comes from robota, the forced labour serfs owed their masters.

Which Google chatbot did engineer Blake Lemoine publicly claim was sentient in 2022?

LaMDA (Language Model for Dialogue Applications) was the chatbot Blake Lemoine called sentient in June 2022; Google put him on leave, fired him in July, and used a lightweight LaMDA to power the first Bard in 2023.

A March 2023 open letter signed by thousands asked AI labs to pause training their most powerful systems for how long?

6 months was the minimum pause the Future of Life Institute's letter asked for, and only for systems more powerful than GPT-4, released a week earlier; it drew more than 30,000 signatures.

A viral AI-generated photo in 2023 showed which public figure in a white puffer coat?

The image of Pope Francis in a white Balenciaga-style puffer jacket went viral in March 2023; the same wave of photorealistic fakes included a staged Trump arrest and a hoax Pentagon explosion that briefly moved stock markets.

Which tool made Jason Allen's 'Théâtre D'opéra Spatial', a 2022 Colorado State Fair prize winner?

Midjourney produced the base image after at least 624 prompts and revisions; Allen then retouched it in Photoshop, and the US Copyright Office later refused to register the work.

Which university's team, led by Sebastian Thrun, won the 2005 DARPA Grand Challenge?

Stanford's modified Volkswagen Touareg, led by Sebastian Thrun, finished the 132-mile desert course first and earned the $2 million prize; Thrun later started Google's self-driving car project.

OpenAI Five, which beat the world champions OG in 2019, plays which five-on-five video game?

Dota 2 was learned from scratch: OpenAI Five played the equivalent of 180 years of games against itself every day before it faced human champions.

Which company launched AIBO, the robot dog that sold out in 20 minutes, in 1999?

Sony ended production in 2006 and stopped repairs in 2014, after which owners took their broken robot dogs to a Buddhist temple for funeral rites.

Which automaker took a controlling stake in Boston Dynamics from SoftBank in 2021?

Hyundai's deal, completed in June 2021, valued the robot maker at $1.1 billion and made the carmaker its third corporate owner in eight years, after Google and SoftBank.

AI pioneer Yoshua Bengio founded the research institute Mila in which Canadian city?

Montreal's Université de Montréal hired Bengio in 1993, and the lab he started there the same year grew into Mila, the Quebec AI Institute.

Prolog, a logic language whose name shortens 'programmation en logique', was created around 1972 in which country?

France's Aix-Marseille University is where Alain Colmerauer and Philippe Roussel built Prolog, drawing on Robert Kowalski's idea that statements of logic could themselves be run as a program.

Marvin Minsky's 1951 SNARC, an early neural-network machine, learned to solve what?

A maze was the test: SNARC simulated rats finding their way through one, using about 40 electronic units built from vacuum tubes and a surplus bomber autopilot, and was perhaps the first electronic learning machine.

Which futurist wrote the 2005 book 'The Singularity Is Near'?

Ray Kurzweil dated human-level AI to 2029 and the singularity to 2045, and stuck to both dates almost twenty years later in his 2024 sequel, 'The Singularity Is Nearer'.

Which word, taken from a Reddit username in 2017, describes video in which a neural network swaps faces?

Deepfake clips on the original Reddit forum included many that swapped actor Nicolas Cage's face into various films. Reddit banned the forum in February 2018.

Which word from human psychology describes a neural network confidently stating something false as fact?

Hallucination is only a loose analogy: in people it means perceiving something that is not there, while a chatbot's version is a fluent answer built on invented facts.

Which company's graphics chips, built for video games, became the workhorse for training neural networks?

Nvidia spent over a billion dollars developing CUDA, software that lets its gaming chips run massively parallel programs, which is just what training a network demands.

Which auction house sold 'Edmond de Belamy', a portrait generated by a neural network, for $432,500 in 2018?

Christie's had valued the print at $7,000 to $10,000. It is signed in ink with part of the algorithm's code where a painter's name would normally go.

Which of Google's products switched to a neural network in 2016 to process whole sentences at a time?

Translate launched in 2006 by statistically matching phrases gleaned from United Nations and European Parliament documents; its older engine worked piece by piece.

A neural network's weighted connections are loosely modelled on which junctions between brain cells?

Synapses are modelled by a network's connections, and the strength of the signal each one passes is set by a weight that is adjusted as the network trains.

In a neural network, which word describes the layers of neurons sitting between the input and the output?

Hidden layers do the intermediate work on a signal as it travels from input to output. The simplest networks have none, feeding their inputs straight to the output.

Convolutional neural networks were inspired by Hubel and Wiesel's studies of which animal's visual cortex?

Cat neurons in the visual cortex each responded only to a small region of the visual field, the idea a convolutional layer copies. The research earned a Nobel Prize in 1981.

Which training technique randomly switches off neurons so a neural network cannot just memorise its data?

Dropout sets the outputs of randomly chosen neurons to zero during training, which stops groups of neurons from leaning too heavily on one another.

Which popular activation function in neural networks simply outputs zero for any negative input?

ReLU, short for rectified linear unit, passes positive values through unchanged, so for any given input many of a network's units output exactly zero.

In an artificial neuron, which term is added to the weighted sum of the inputs before the activation function?

Bias loosely corresponds to a real neuron's threshold potential, the level of stimulation it needs before it fires. Engineer Bernard Widrow introduced the term in 1960.

Which computer scientist built a network at Bell Labs that read handwritten ZIP codes for the US Postal Service?

Yann LeCun's design grew into LeNet, a family of networks later built into cash machines to read the amounts written on cheques.

Which psychologist's 1949 rule, that neurons firing together strengthen their link, shaped how neural networks learn?

Donald Hebb, a Canadian, introduced the idea in his book The Organization of Behavior, and learning rules built on it are still described as Hebbian.

Which operation in a convolutional neural network shrinks a feature map by boiling each small region down to one value?

Pooling comes in two common kinds: max pooling keeps only the strongest response in each patch of the feature map, while average pooling takes the mean of the patch instead.

In a convolutional neural network, what is the small grid of weights that slides across an image called?

Kernel is another name for a filter. Because the same small set of weights is reused at every position, a layer needs only 25 of them to scan an image in 5-by-5 tiles.

Which type of neural network learns by squeezing its input through a narrow bottleneck and then rebuilding it?

Autoencoder designs have two halves, an encoder that boils the input down and a decoder that reconstructs it, which makes them handy for cleaning the noise out of data.

Which scientist's Navy-funded learning machine was billed as a revolution by The New York Times in 1958?

Frank Rosenblatt was a psychologist, not an engineer. His machine saw the world through a 20-by-20 grid of 400 light sensors after first being simulated on an IBM 704.

Which neural network design, published by Hochreiter and Schmidhuber in 1997, uses gates to hold on to information?

Long short-term memory cells have three gates, for input, output and forgetting, which regulate what flows in and out so that a value can be kept over long intervals.

Which pair's 1943 paper modelled the nervous system as a network of simple logical elements?

McCulloch and Pitts were an unlikely team: Walter Pitts was a homeless teenager whom psychiatry professor Warren McCulloch had invited to live with his family.

Which proven result says a neural network with enough neurons can, in principle, mimic any continuous function?

Universal approximation theorem results only prove that a suitable network exists. They do not say how large it must be or how to find its settings by training.

Which company offered $1 million in 2006 for an algorithm that better predicted how its users would rate films?

Netflix paid out in 2009 to BellKor's Pragmatic Chaos, a team whose predictions beat the company's own Cinematch system by 10.06%.

Scikit-learn, a popular free machine learning library, is written for which programming language?

Python tutorials traditionally use 'spam' and 'eggs' as placeholder names, a nod to Monty Python, whom creator Guido van Rossum enjoyed while developing the language.

Which machine learning task, used to flag financial fraud, hunts for rare data points that break the usual pattern?

Anomaly detection also spots failing equipment and network intruders, and the oddities it turns up are often the most interesting records in the whole data set.

Which term describes a machine learning model memorising its training data, then failing on new examples?

Overfitting means the model has mistaken chance noise for a real pattern. Given as many adjustable settings as data points, it can simply store every answer.

Which 18th-century Presbyterian minister's theorem on probability underlies a family of machine learning classifiers?

Thomas Bayes never published the idea himself. His friend Richard Price edited the notes and saw them into print after his death.

Which German horse, once thought to do arithmetic, lends his name to AI models that are right for the wrong reasons?

Clever Hans was really reading involuntary cues in his trainer's body language. A model shows the same effect when it leans on a stray hint in its data, not on what it was meant to learn.

Which machine learning method, set out in a much-cited Leo Breiman paper, pools the votes of many decision trees?

Random forest classifiers go with whichever answer most of their trees choose, and the name is legally protected: Breiman and Adele Cutler registered it as a trademark in 2006.

Which flower, measured in a 1936 paper by statistician Ronald Fisher, names a classic machine learning dataset?

Iris measurements from 150 flowers of three species make up the set. Botanist Edgar Anderson gathered them, but Fisher's paper made them famous.

Whose online machine learning class drew over 100,000 students in 2011 and led him to co-found Coursera?

Andrew Ng started Coursera in 2012 with fellow computer scientist Daphne Koller, a year after the class first went out on its own website, ml-class.org.

A Google project launched in 2008 tried to predict outbreaks of which illness from what people typed into search?

Influenza proved a slippery target: Google Flu Trends missed the 2009 spring pandemic and later predicted twice as many doctors' visits as the CDC recorded.

Which open-source machine learning library did Google release in 2015 as the successor to its in-house DistBelief?

TensorFlow came out of an effort by engineers including Jeff Dean to rebuild DistBelief, a proprietary system dating from 2011, into a faster and more robust library.

Which data science competition site, founded by Anthony Goldbloom in 2010, was acquired by Google in 2017?

Kaggle's sale was announced by Fei-Fei Li, then a chief scientist at Google. Besides its contests, the site lets data scientists publish datasets and build models together.

Which term, coined by Francis Galton for heights drifting back to average, names the task of predicting a number?

Regression began as a biological observation: the descendants of tall ancestors tend to be nearer average height. Karl Pearson and Udny Yule later widened it into general statistics.

Which optimisation method, likened to hikers feeling their way down a foggy mountain, minimises a model's error?

Gradient descent takes repeated small steps in whichever direction slopes down most steeply. The idea is generally credited to Augustin-Louis Cauchy, who suggested it in 1847.

Which algorithm classifies a new data point by a plurality vote of the most similar labelled examples around it?

K-nearest neighbours was first developed by Evelyn Fix and Joseph Hodges in 1951. With k set to one, a point simply takes the label of its single closest example.

Which technique repeatedly splits a dataset into folds, training on some and testing on the one held back?

Cross-validation in its k-fold form uses every fold exactly once as the test data, so each record helps both to build the model and to judge it.

Which table sets out a classifier's true positives, false positives, true negatives and false negatives?

Confusion matrix is a literal name: the table shows at a glance which classes a system keeps confusing. It has its origins in human studies of how sounds are perceived.

Which theorem of David Wolpert's says that no single algorithm is best across every possible problem?

No free lunch results say any two algorithms perform equally well once averaged across all possible problems, so a method's edge on one kind of task is paid for on another.

Which classifier, developed at AT&T Bell Laboratories, separates two classes with the widest possible margin?

Support vector machine takes its name from the samples sitting right on the margin, the support vectors. In general, the wider that margin, the fewer errors on new data.

DeepMind's AlphaFold, trained on about 170,000 known examples, predicts the 3D structure of which molecules?

Proteins otherwise have to be mapped with slow, expensive lab methods such as X-ray crystallography. AlphaFold 2's results in 2020 were described as astounding.

Which console's games, among them Breakout and Pong, did DeepMind's early AI teach itself to play?

Atari 2600 games made a clean test because the program learned from nothing but the raw pixels on screen. By 2020 DeepMind's Agent57 topped human-level play on all 57 games in the suite.

DeepMind's GraphCast makes 10-day predictions of what in under a minute, outdoing Europe's gold-standard system?

Weather forecasts of that range normally take hours on a supercomputer. GraphCast learned its craft from four decades of past conditions logged by the European centre it outdid.

DeepMind's AlphaProof and AlphaGeometry matched a silver medallist in 2024 at which international contest?

Mathematical Olympiad problems were already a benchmark: AlphaGeometry alone had solved 25 of 30 past geometry questions, a performance comparable to a gold medallist's.

DeepMind's AlphaStar reached Grandmaster level in which video game in 2019, ranking in the top 0.2% of players?

StarCraft II runs in real time and hides most of the battlefield from each player. Demis Hassabis had called StarCraft the next step up after games like Go as early as 2011.

Applied to Google's own data centres, DeepMind's machine learning cut the energy used for what by up to 40 percent?

Cooling is one of a data centre's main energy drains, and some of the system's tactics surprised veteran operators, such as exploiting the cold season to make colder water than usual.

Demis Hassabis, DeepMind's co-founder, was co-designer and lead programmer at 17 of which 1994 simulation game?

Theme Park sold several million copies. Hassabis had landed at its studio, Bullfrog, through a magazine's win-a-job competition during a gap year before Cambridge.

Which champion chess engine did DeepMind's AlphaZero beat in 2017 after only nine hours of teaching itself to play?

Stockfish lost 28 games and drew 72 of the 100 without a single win, despite examining 70 million positions a second to AlphaZero's 80,000.

Which DeepMind system of 2016, built to generate raw audio, went on to supply voices for the Google Assistant?

WaveNet models the waveform of speech directly, which greatly reduced the number of voice-actor recordings needed to create a new synthetic voice.

Which European Go champion lost 5–0 to AlphaGo in 2015, the first professional beaten on level terms?

Fan Hui was then hired to advise the AlphaGo team, and he served as a judge at the program's far more famous match the following year.

Which database of handwritten digits, penned by US census workers and high-school students, trains image systems?

MNIST holds 60,000 training images and 10,000 test images. Its makers remixed two older collections because one came from census staff and the other from students.