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Artificial intelligence(AI), in its broadest sense, isintelligenceexhibited bymachines,particularlycomputer systems.It is afield of researchincomputer sciencethat develops and studies methods andsoftwarethat enable machines toperceive their environmentand uselearningand intelligence to take actions that maximize their chances of achieving defined goals.[1]Such machines may be called AIs.

Some high-profileapplications of AIinclude advancedweb search engines(e.g.,Google Search);recommendation systems(used byYouTube,Amazon,andNetflix); interactingvia human speech(e.g.,Google Assistant,Siri,andAlexa);autonomous vehicles(e.g.,Waymo);generativeandcreativetools (e.g.,ChatGPT,Apple Intelligence,andAI art); andsuperhumanplay and analysis instrategy games(e.g.,chessandGo).[2]However, many AI applications are not perceived as AI: "A lot of cutting edge AI has filtered into general applications, often without being called AI because once something becomes useful enough and common enough it'snot labeled AI anymore."[3][4]

Alan Turingwas the first person to conduct substantial research in the field that he called machine intelligence.[5]Artificial intelligence was founded as an academic discipline in 1956,[6]by those now considered the founding fathers of AI,John McCarthy,Marvin Minksy,Nathaniel Rochester,andClaude Shannon.[7][8]The field went through multiple cycles of optimism,[9][10]followed by periods of disappointment and loss of funding, known asAI winter.[11][12]Funding and interest vastly increased after 2012 whendeep learningsurpassed all previous AI techniques,[13]and after 2017 with thetransformer architecture.[14]This led to theAI boomof the early 2020s, with companies, universities, and laboratories overwhelmingly based in the United States pioneering significantadvances in artificial intelligence.[15]

The growing use of artificial intelligence in the 21st century is influencing a societal and economic shift towards increasedautomation,data-driven decision-making,and theintegration of AI systemsinto various economic sectors and areas of life,impacting job markets,healthcare,government,industry,education,propaganda,anddisinformation.This raises questions aboutthe long-term effects,ethical implications,andrisks of AI,prompting discussions aboutregulatory policiesto ensure thesafety and benefits of the technology.

The various subfields of AI research are centered around particular goals and the use of particular tools. The traditional goals of AI research includereasoning,knowledge representation,planning,learning,natural language processing,perception, and support forrobotics.[a]General intelligence—the ability to complete any task performable by a human on an at least equal level—is among the field's long-term goals.[16]

To reach these goals, AI researchers have adapted and integrated a wide range of techniques, includingsearchandmathematical optimization,formal logic,artificial neural networks,and methods based onstatistics,operations research,andeconomics.[b]AI also draws uponpsychology,linguistics,philosophy,neuroscience,and other fields.[17]

Goals

The general problem of simulating (or creating) intelligence has been broken into subproblems. These consist of particular traits or capabilities that researchers expect an intelligent system to display. The traits described below have received the most attention and cover the scope of AI research.[a]

Reasoning and problem-solving

Early researchers developed algorithms that imitated step-by-step reasoning that humans use when they solve puzzles or make logicaldeductions.[18]By the late 1980s and 1990s, methods were developed for dealing withuncertainor incomplete information, employing concepts fromprobabilityandeconomics.[19]

Many of these algorithms are insufficient for solving large reasoning problems because they experience a "combinatorial explosion": They become exponentially slower as the problems grow.[20]Even humans rarely use the step-by-step deduction that early AI research could model. They solve most of their problems using fast, intuitive judgments.[21]Accurate and efficient reasoning is an unsolved problem.

Knowledge representation

An ontology represents knowledge as a set of concepts within a domain and the relationships between those concepts

Knowledge representationandknowledge engineering[22]allow AI programs to answer questions intelligently and make deductions about real-world facts. Formal knowledge representations are used in content-based indexing and retrieval,[23]scene interpretation,[24]clinical decision support,[25]knowledge discovery (mining "interesting" and actionable inferences from largedatabases),[26]and other areas.[27]

Aknowledge baseis a body of knowledge represented in a form that can be used by a program. Anontologyis the set of objects, relations, concepts, and properties used by a particular domain of knowledge.[28]Knowledge bases need to represent things such as objects, properties, categories, and relations between objects;[29]situations, events, states, and time;[30]causes and effects;[31]knowledge about knowledge (what we know about what other people know);[32]default reasoning(things that humans assume are true until they are told differently and will remain true even when other facts are changing);[33]and many other aspects and domains of knowledge.

Among the most difficult problems in knowledge representation are the breadth of commonsense knowledge (the set of atomic facts that the average person knows is enormous);[34]and the sub-symbolic form of most commonsense knowledge (much of what people know is not represented as "facts" or "statements" that they could express verbally).[21]There is also the difficulty ofknowledge acquisition,the problem of obtaining knowledge for AI applications.[c]

Planning and decision-making

An "agent" is anything that perceives and takes actions in the world. Arational agenthas goals or preferences and takes actions to make them happen.[d][37]Inautomated planning,the agent has a specific goal.[38]Inautomated decision-making,the agent has preferences—there are some situations it would prefer to be in, and some situations it is trying to avoid. The decision-making agent assigns a number to each situation (called the "utility") that measures how much the agent prefers it. For each possible action, it can calculate the"expected utility":theutilityof all possible outcomes of the action, weighted by the probability that the outcome will occur. It can then choose the action with the maximum expected utility.[39]

Inclassical planning,the agent knows exactly what the effect of any action will be.[40]In most real-world problems, however, the agent may not be certain about the situation they are in (it is "unknown" or "unobservable" ) and it may not know for certain what will happen after each possible action (it is not "deterministic" ). It must choose an action by making a probabilistic guess and then reassess the situation to see if the action worked.[41]

In some problems, the agent's preferences may be uncertain, especially if there are other agents or humans involved. These can be learned (e.g., withinverse reinforcement learning), or the agent can seek information to improve its preferences.[42]Information value theorycan be used to weigh the value of exploratory or experimental actions.[43]The space of possible future actions and situations is typicallyintractablylarge, so the agents must take actions and evaluate situations while being uncertain of what the outcome will be.

AMarkov decision processhas atransition modelthat describes the probability that a particular action will change the state in a particular way and areward functionthat supplies the utility of each state and the cost of each action. Apolicyassociates a decision with each possible state. The policy could be calculated (e.g., byiteration), beheuristic,or it can be learned.[44]

Game theorydescribes the rational behavior of multiple interacting agents and is used in AI programs that make decisions that involve other agents.[45]

Learning

Machine learningis the study of programs that can improve their performance on a given task automatically.[46]It has been a part of AI from the beginning.[e]

There are several kinds of machine learning.Unsupervised learninganalyzes a stream of data and finds patterns and makes predictions without any other guidance.[49]Supervised learningrequires a human to label the input data first, and comes in two main varieties:classification(where the program must learn to predict what category the input belongs in) andregression(where the program must deduce a numeric function based on numeric input).[50]

Inreinforcement learning,the agent is rewarded for good responses and punished for bad ones. The agent learns to choose responses that are classified as "good".[51]Transfer learningis when the knowledge gained from one problem is applied to a new problem.[52]Deep learningis a type of machine learning that runs inputs through biologically inspiredartificial neural networksfor all of these types of learning.[53]

Computational learning theorycan assess learners bycomputational complexity,bysample complexity(how much data is required), or by other notions ofoptimization.[54]

Natural language processing

Natural language processing(NLP)[55]allows programs to read, write and communicate in human languages such asEnglish.Specific problems includespeech recognition,speech synthesis,machine translation,information extraction,information retrievalandquestion answering.[56]

Early work, based onNoam Chomsky'sgenerative grammarandsemantic networks,had difficulty withword-sense disambiguation[f]unless restricted to small domains called "micro-worlds"(due to the common sense knowledge problem[34]).Margaret Mastermanbelieved that it was meaning and not grammar that was the key to understanding languages, and thatthesauriand not dictionaries should be the basis of computational language structure.

Modern deep learning techniques for NLP includeword embedding(representing words, typically asvectorsencoding their meaning),[57]transformers(a deep learning architecture using anattentionmechanism),[58]and others.[59]In 2019,generative pre-trained transformer(or "GPT" ) language models began to generate coherent text,[60][61]and by 2023 these models were able to get human-level scores on thebar exam,SATtest,GREtest, and many other real-world applications.[62]

Perception

Machine perceptionis the ability to use input from sensors (such as cameras, microphones, wireless signals, activelidar,sonar, radar, andtactile sensors) to deduce aspects of the world.Computer visionis the ability to analyze visual input.[63]

The field includesspeech recognition,[64]image classification,[65]facial recognition,object recognition,[66]object tracking,[67]androbotic perception.[68]

Social intelligence

Kismet,a robot head which was made in the 1990s; a machine that can recognize and simulate emotions[69]

Affective computingis an interdisciplinary umbrella that comprises systems that recognize, interpret, process, or simulate humanfeeling, emotion, and mood.[70]For example, somevirtual assistantsare programmed to speak conversationally or even to banter humorously; it makes them appear more sensitive to the emotional dynamics of human interaction, or to otherwise facilitatehuman–computer interaction.

However, this tends to give naïve users an unrealistic conception of the intelligence of existing computer agents.[71]Moderate successes related to affective computing include textualsentiment analysisand, more recently,multimodal sentiment analysis,wherein AI classifies the affects displayed by a videotaped subject.[72]

General intelligence

A machine withartificial general intelligenceshould be able to solve a wide variety of problems with breadth and versatility similar to human intelligence.[16]

Techniques

AI research uses a wide variety of techniques to accomplish the goals above.[b]

Search and optimization

AI can solve many problems by intelligently searching through many possible solutions.[73]There are two very different kinds of search used in AI:state space searchandlocal search.

State space search

State space searchsearches through a tree of possible states to try to find a goal state.[74]For example,planningalgorithms search through trees of goals and subgoals, attempting to find a path to a target goal, a process calledmeans-ends analysis.[75]

Simple exhaustive searches[76]are rarely sufficient for most real-world problems: thesearch space(the number of places to search) quickly grows toastronomical numbers.The result is a search that istoo slowor never completes.[20]"Heuristics"or" rules of thumb "can help prioritize choices that are more likely to reach a goal.[77]

Adversarial searchis used forgame-playingprograms, such as chess or Go. It searches through atreeof possible moves and counter-moves, looking for a winning position.[78]

Local search

Illustration ofgradient descentfor 3 different starting points; two parameters (represented by the plan coordinates) are adjusted in order to minimize theloss function(the height)

Local searchusesmathematical optimizationto find a solution to a problem. It begins with some form of guess and refines it incrementally.[79]

Gradient descentis a type of local search that optimizes a set of numerical parameters by incrementally adjusting them to minimize aloss function.Variants ofgradient descentare commonly used to train neural networks.[80]

Another type of local search isevolutionary computation,which aims to iteratively improve a set of candidate solutions by "mutating" and "recombining" them,selectingonly the fittest to survive each generation.[81]

Distributed search processes can coordinate viaswarm intelligencealgorithms. Two popular swarm algorithms used in search areparticle swarm optimization(inspired by birdflocking) andant colony optimization(inspired byant trails).[82]

Logic

Formallogicis used forreasoningandknowledge representation.[83] Formal logic comes in two main forms:propositional logic(which operates on statements that are true or false and useslogical connectivessuch as "and", "or", "not" and "implies" )[84]andpredicate logic(which also operates on objects, predicates and relations and usesquantifierssuch as "EveryXis aY"and" There aresomeXs that areYs ").[85]

Deductive reasoningin logic is the process ofprovinga new statement (conclusion) from other statements that are given and assumed to be true (thepremises).[86]Proofs can be structured as prooftrees,in which nodes are labelled by sentences, and children nodes are connected to parent nodes byinference rules.

Given a problem and a set of premises, problem-solving reduces to searching for a proof tree whose root node is labelled by a solution of the problem and whoseleaf nodesare labelled by premises oraxioms.In the case ofHorn clauses,problem-solving search can be performed by reasoningforwardsfrom the premises orbackwardsfrom the problem.[87]In the more general case of the clausal form offirst-order logic,resolutionis a single, axiom-free rule of inference, in which a problem is solved by proving a contradiction from premises that include the negation of the problem to be solved.[88]

Inference in both Horn clause logic and first-order logic isundecidable,and thereforeintractable.However, backward reasoning with Horn clauses, which underpins computation in thelogic programminglanguageProlog,isTuring complete.Moreover, its efficiency is competitive with computation in othersymbolic programminglanguages.[89]

Fuzzy logicassigns a "degree of truth" between 0 and 1. It can therefore handle propositions that are vague and partially true.[90]

Non-monotonic logics,including logic programming withnegation as failure,are designed to handledefault reasoning.[33] Other specialized versions of logic have been developed to describe many complex domains.

Probabilistic methods for uncertain reasoning

A simpleBayesian network,with the associatedconditional probability tables

Many problems in AI (including in reasoning, planning, learning, perception, and robotics) require the agent to operate with incomplete or uncertain information. AI researchers have devised a number of tools to solve these problems using methods fromprobabilitytheory and economics.[91]Precise mathematical tools have been developed that analyze how an agent can make choices and plan, usingdecision theory,decision analysis,[92]andinformation value theory.[93]These tools include models such asMarkov decision processes,[94]dynamicdecision networks,[95]game theoryandmechanism design.[96]

Bayesian networks[97]are a tool that can be used forreasoning(using theBayesian inferencealgorithm),[g][99]learning(using theexpectation–maximization algorithm),[h][101]planning(usingdecision networks)[102]andperception(usingdynamic Bayesian networks).[95]

Probabilistic algorithms can also be used for filtering, prediction, smoothing, and finding explanations for streams of data, thus helpingperceptionsystems analyze processes that occur over time (e.g.,hidden Markov modelsorKalman filters).[95]

Expectation–maximizationclusteringofOld Faithfuleruption data starts from a random guess but then successfully converges on an accurate clustering of the two physically distinct modes of eruption

Classifiers and statistical learning methods

The simplest AI applications can be divided into two types: classifiers (e.g., "if shiny then diamond" ), on one hand, and controllers (e.g., "if diamond then pick up" ), on the other hand.Classifiers[103]are functions that usepattern matchingto determine the closest match. They can be fine-tuned based on chosen examples usingsupervised learning.Each pattern (also called an "observation") is labeled with a certain predefined class. All the observations combined with their class labels are known as adata set.When a new observation is received, that observation is classified based on previous experience.[50]

There are many kinds of classifiers in use. Thedecision treeis the simplest and most widely used symbolic machine learning algorithm.[104]K-nearest neighboralgorithm was the most widely used analogical AI until the mid-1990s, andKernel methodssuch as thesupport vector machine(SVM) displaced k-nearest neighbor in the 1990s.[105] Thenaive Bayes classifieris reportedly the "most widely used learner"[106]at Google, due in part to its scalability.[107] Neural networksare also used as classifiers.[108]

Artificial neural networks

A neural network is an interconnected group of nodes, akin to the vast network ofneuronsin thehuman brain

An artificial neural network is based on a collection of nodes also known asartificial neurons,which loosely model theneuronsin a biological brain. It is trained to recognise patterns; once trained, it can recognise those patterns in fresh data. There is an input, at least one hidden layer of nodes and an output. Each node applies a function and once theweightcrosses its specified threshold, the data is transmitted to the next layer. A network is typically called a deep neural network if it has at least 2 hidden layers.[108]

Learning algorithms for neural networks uselocal searchto choose the weights that will get the right output for each input during training. The most common training technique is thebackpropagationalgorithm.[109] Neural networks learn to model complex relationships between inputs and outputs andfind patternsin data. In theory, a neural network can learn any function.[110]

Infeedforward neural networksthe signal passes in only one direction.[111]Recurrent neural networksfeed the output signal back into the input, which allows short-term memories of previous input events.Long short term memoryis the most successful network architecture for recurrent networks.[112] Perceptrons[113] use only a single layer of neurons, deep learning[114]uses multiple layers. Convolutional neural networksstrengthen the connection between neurons that are "close" to each other—this is especially important inimage processing,where a local set of neurons mustidentify an "edge"before the network can identify an object.[115]

Deep learning

Deep learning[114] uses several layers of neurons between the network's inputs and outputs. The multiple layers can progressively extract higher-level features from the raw input. For example, inimage processing,lower layers may identify edges, while higher layers may identify the concepts relevant to a human such as digits, letters, or faces.[116]

Deep learning has profoundly improved the performance of programs in many important subfields of artificial intelligence, includingcomputer vision,speech recognition,natural language processing,image classification,[117]and others. The reason that deep learning performs so well in so many applications is not known as of 2023.[118] The sudden success of deep learning in 2012–2015 did not occur because of some new discovery or theoretical breakthrough (deep neural networks andbackpropagationhad been described by many people, as far back as the 1950s)[i] but because of two factors: the incredible increase in computer power (including the hundred-fold increase in speed by switching toGPUs) and the availability of vast amounts of training data, especially the giantcurated datasetsused for benchmark testing, such asImageNet.[j]

GPT

Generative pre-trained transformers(GPT) arelarge language modelsthat are based on the semantic relationships between words in sentences (natural language processing). Text-based GPT models are pre-trained on a largecorpus of textwhich can be from the internet. The pre-training consists in predicting the nexttoken(a token being usually a word, subword, or punctuation). Throughout this pre-training, GPT models accumulate knowledge about the world, and can then generate human-like text by repeatedly predicting the next token. Typically, a subsequent training phase makes the model more truthful, useful and harmless, usually with a technique calledreinforcement learning from human feedback(RLHF). Current GPT models are still prone to generating falsehoods called "hallucinations",although this can be reduced with RLHF and quality data. They are used inchatbots,which allow you to ask a question or request a task in simple text.[127][128]

Current models and services include:Gemini(formerly Bard),ChatGPT,Grok,Claude,CopilotandLLaMA.[129]MultimodalGPT models can process different types of data (modalities) such as images, videos, sound, and text.[130]

Specialized hardware and software

In the late 2010s,graphics processing units(GPUs) that were increasingly designed with AI-specific enhancements and used with specializedTensorFlowsoftware had replaced previously usedcentral processing unit(CPUs) as the dominant means for large-scale (commercial and academic)machine learningmodels' training.[131]Specializedprogramming languagessuch asPrologwere used in early AI research,[132]butgeneral-purpose programming languageslikePythonhave become predominant.[133]

Applications

AI and machine learning technology is used in most of the essential applications of the 2020s, including:search engines(such asGoogle Search),targeting online advertisements,recommendation systems(offered byNetflix,YouTubeorAmazon), drivinginternet traffic,targeted advertising(AdSense,Facebook),virtual assistants(such asSiriorAlexa),autonomous vehicles(includingdrones,ADASandself-driving cars),automatic language translation(Microsoft Translator,Google Translate),facial recognition(Apple'sFace IDorMicrosoft'sDeepFaceandGoogle'sFaceNet) andimage labeling(used byFacebook,Apple'siPhotoandTikTok). The deployment of AI may be overseen by aChief automation officer(CAO).

Health and medicine

The application of AI inmedicineandmedical researchhas the potential to increase patient care and quality of life.[134]Through the lens of theHippocratic Oath,medical professionals are ethically compelled to use AI, if applications can more accurately diagnose and treat patients.

For medical research, AI is an important tool for processing and integratingbig data.This is particularly important fororganoidandtissue engineeringdevelopment which usemicroscopyimaging as a key technique in fabrication.[135]It has been suggested that AI can overcome discrepancies in funding allocated to different fields of research.[135]New AI tools can deepen the understanding of biomedically relevant pathways. For example,AlphaFold 2(2021) demonstrated the ability to approximate, in hours rather than months, the 3Dstructure of a protein.[136]In 2023, it was reported that AI-guided drug discovery helped find a class of antibiotics capable of killing two different types of drug-resistant bacteria.[137]In 2024, researchers used machine learning to accelerate the search forParkinson's diseasedrug treatments. Their aim was to identify compounds that block the clumping, or aggregation, ofalpha-synuclein(the protein that characterises Parkinson's disease). They were able to speed up the initial screening process ten-fold and reduce the cost by a thousand-fold.[138][139]

Games

Game playingprograms have been used since the 1950s to demonstrate and test AI's most advanced techniques.[140]Deep Bluebecame the first computer chess-playing system to beat a reigning world chess champion,Garry Kasparov,on 11 May 1997.[141]In 2011, in aJeopardy!quiz showexhibition match,IBM'squestion answering system,Watson,defeated the two greatestJeopardy!champions,Brad RutterandKen Jennings,by a significant margin.[142]In March 2016,AlphaGowon 4 out of 5 games ofGoin a match with Go championLee Sedol,becoming the firstcomputer Go-playing system to beat a professional Go player withouthandicaps.Then in 2017 itdefeated Ke Jie,who was the best Go player in the world.[143]Other programs handleimperfect-informationgames, such as thepoker-playing programPluribus.[144]DeepMinddeveloped increasingly generalisticreinforcement learningmodels, such as withMuZero,which could be trained to play chess, Go, orAtarigames.[145]In 2019, DeepMind's AlphaStar achieved grandmaster level inStarCraft II,a particularly challenging real-time strategy game that involves incomplete knowledge of what happens on the map.[146]In 2021, an AI agent competed in a PlayStationGran Turismocompetition, winning against four of the world's best Gran Turismo drivers using deep reinforcement learning.[147]

Finance

Finance is one of the fastest growing sectors where applied AI tools are being deployed: from retail online banking to investment advice and insurance, where automated "robot advisers" have been in use for some years. [148]

World Pensionsexperts like Nicolas Firzli insist it may be too early to see the emergence of highly innovative AI-informed financial products and services: "the deployment of AI tools will simply further automatise things: destroying tens of thousands of jobs in banking, financial planning, and pension advice in the process, but I’m not sure it will unleash a new wave of [e.g., sophisticated] pension innovation."[149]

Military

Various countries are deploying AI military applications.[150]The main applications enhancecommand and control,communications, sensors, integration and interoperability.[151]Research is targeting intelligence collection and analysis, logistics, cyber operations, information operations, and semiautonomous andautonomous vehicles.[150]AI technologies enable coordination of sensors and effectors, threat detection and identification, marking of enemy positions,target acquisition,coordination and deconfliction of distributedJoint Firesbetween networked combat vehicles involving manned and unmanned teams.[151]AI was incorporated into military operations in Iraq and Syria.[150]

In November 2023, US Vice PresidentKamala Harrisdisclosed a declaration signed by 31 nations to set guardrails for the military use of AI. The commitments include using legal reviews to ensure the compliance of military AI with international laws, and being cautious and transparent in the development of this technology.[152]

Generative AI

Vincent van Gogh in watercolour created by generative AI software

In the early 2020s,generative AIgained widespread prominence. In March 2023, 58% of U.S. adults had heard aboutChatGPTand 14% had tried it.[153]The increasing realism and ease-of-use of AI-basedtext-to-imagegenerators such asMidjourney,DALL-E,andStable Diffusionsparked a trend ofviralAI-generated photos. Widespread attention was gained by a fake photo ofPope Franciswearing a white puffer coat, the fictional arrest ofDonald Trump,and a hoax of an attack on thePentagon,as well as the usage in professional creative arts.[154][155]

Other industry-specific tasks

There are also thousands of successful AI applications used to solve specific problems for specific industries or institutions. In a 2017 survey, one in five companies reported having incorporated "AI" in some offerings or processes.[156]A few examples areenergy storage,medical diagnosis, military logistics, applications that predict the result of judicial decisions,foreign policy,or supply chain management.

AI applications for evacuation anddisastermanagment are growing. AI has been used to investigate if and how people evacuated in large scale and small scale evacuations using historical data from GPS, videos or social media. Further, AI can provide real time information on the real time evacuation conditions.[157][158][159]

In agriculture, AI has helped farmers identify areas that need irrigation, fertilization, pesticide treatments or increasing yield. Agronomists use AI to conduct research and development. AI has been used to predict the ripening time for crops such as tomatoes, monitor soil moisture, operate agricultural robots, conduct predictive analytics, classify livestock pig call emotions, automate greenhouses, detect diseases and pests, and save water.

Artificial intelligence is used in astronomy to analyze increasing amounts of available data and applications, mainly for "classification, regression, clustering, forecasting, generation, discovery, and the development of new scientific insights" for example for discovering exoplanets, forecasting solar activity, and distinguishing between signals and instrumental effects in gravitational wave astronomy. It could also be used for activities in space such as space exploration, including analysis of data from space missions, real-time science decisions of spacecraft, space debris avoidance, and more autonomous operation.

Ethics

AI has potential benefits and potential risks. AI may be able to advance science and find solutions for serious problems:Demis HassabisofDeep Mindhopes to "solve intelligence, and then use that to solve everything else".[160]However, as the use of AI has become widespread, several unintended consequences and risks have been identified.[161]In-production systems can sometimes not factor ethics and bias into their AI training processes, especially when the AI algorithms are inherently unexplainable in deep learning.[162]

Risks and harm

Privacy and copyright

Machine-learning algorithms require large amounts of data. The techniques used to acquire this data have raised concerns aboutprivacy,surveillanceandcopyright.

Technology companies collect a wide range of data from their users, including online activity, geolocation data, video and audio.[163] For example, in order to buildspeech recognitionalgorithms,Amazonhas recorded millions of private conversations and allowedtemporary workersto listen to and transcribe some of them.[164]Opinions about this widespreadsurveillancerange from those who see it as anecessary evilto those for whom it is clearlyunethicaland a violation of theright to privacy.[165]

AI developers argue that this is the only way to deliver valuable applications. and have developed several techniques that attempt to preserve privacy while still obtaining the data, such asdata aggregation,de-identificationanddifferential privacy.[166]Since 2016, some privacy experts, such asCynthia Dwork,have begun to view privacy in terms offairness.Brian Christianwrote that experts have pivoted "from the question of 'what they know' to the question of 'what they're doing with it'."[167]

Generative AI is often trained on unlicensed copyrighted works, including in domains such as images or computer code; the output is then used under the rationale of "fair use".Experts disagree about how well and under what circumstances this rationale will hold up in courts of law; relevant factors may include" the purpose and character of the use of the copyrighted work "and" the effect upon the potential market for the copyrighted work ".[168][169]Website owners who do not wish to have their content scraped can indicate it in a "robots.txt"file.[170]In 2023, leading authors (includingJohn GrishamandJonathan Franzen) sued AI companies for using their work to train generative AI.[171][172]Another discussed approach is to envision a separatesui generissystem of protection for creations generated by AI to ensure fair attribution and compensation for human authors.[173]

Misinformation

YouTube,Facebookand others userecommender systemsto guide users to more content. These AI programs were given the goal ofmaximizinguser engagement (that is, the only goal was to keep people watching). The AI learned that users tended to choosemisinformation,conspiracy theories,and extremepartisancontent, and, to keep them watching, the AI recommended more of it. Users also tended to watch more content on the same subject, so the AI led people intofilter bubbleswhere they received multiple versions of the same misinformation.[174]This convinced many users that the misinformation was true, and ultimately undermined trust in institutions, the media and the government.[175]The AI program had correctly learned to maximize its goal, but the result was harmful to society. After the U.S. election in 2016, major technology companies took steps to mitigate the problem[citation needed].

In 2022,generative AIbegan to create images, audio, video and text that are indistinguishable from real photographs, recordings, films, or human writing. It is possible for bad actors to use this technology to create massive amounts of misinformation or propaganda.[176]AI pioneerGeoffrey Hintonexpressed concern about AI enabling "authoritarian leaders to manipulate their electorates" on a large scale, among other risks.[177]

Algorithmic bias and fairness

Machine learning applications will be biased if they learn from biased data.[178]The developers may not be aware that the bias exists.[179] Bias can be introduced by the waytraining datais selected and by the way a model is deployed.[180][178]If a biased algorithm is used to make decisions that can seriouslyharmpeople (as it can inmedicine,finance,recruitment,housingorpolicing) then the algorithm may causediscrimination.[181] Fairnessin machine learning is the study of how to prevent the harm caused by algorithmic bias. It has become serious area of academic study within AI. Researchers have discovered it is not always possible to define "fairness" in a way that satisfies all stakeholders.[182]

On June 28, 2015,Google Photos's new image labeling feature mistakenly identified Jacky Alcine and a friend as "gorillas" because they were black. The system was trained on a dataset that contained very few images of black people,[183]a problem called "sample size disparity".[184]Google "fixed" this problem by preventing the system from labellinganythingas a "gorilla". Eight years later, in 2023, Google Photos still could not identify a gorilla, and neither could similar products from Apple, Facebook, Microsoft and Amazon.[185]

COMPASis a commercial program widely used byU.S. courtsto assess the likelihood of adefendantbecoming arecidivist. In 2016,Julia AngwinatProPublicadiscovered that COMPAS exhibited racial bias, despite the fact that the program was not told the races of the defendants. Although the error rate for both whites and blacks was calibrated equal at exactly 61%, the errors for each race were different—the system consistently overestimated the chance that a black person would re-offend and would underestimate the chance that a white person would not re-offend.[186]In 2017, several researchers[k]showed that it was mathematically impossible for COMPAS to accommodate all possible measures of fairness when the base rates of re-offense were different for whites and blacks in the data.[188]

A program can make biased decisions even if the data does not explicitly mention a problematic feature (such as "race" or "gender" ). The feature will correlate with other features (like "address", "shopping history" or "first name" ), and the program will make the same decisions based on these features as it would on "race" or "gender".[189] Moritz Hardt said "the most robust fact in this research area is that fairness through blindness doesn't work."[190]

Criticism of COMPAS highlighted that machine learning models are designed to make "predictions" that are only valid if we assume that the future will resemble the past. If they are trained on data that includes the results of racist decisions in the past, machine learning models must predict that racist decisions will be made in the future. If an application then uses these predictions asrecommendations,some of these "recommendations" will likely be racist.[191]Thus, machine learning is not well suited to help make decisions in areas where there is hope that the future will bebetterthan the past. It is descriptive rather than prescriptive.[l]

Bias and unfairness may go undetected because the developers are overwhelmingly white and male: among AI engineers, about 4% are black and 20% are women.[184]

At its 2022Conference on Fairness, Accountability, and Transparency(ACM FAccT 2022), theAssociation for Computing Machinery,in Seoul, South Korea, presented and published findings that recommend that until AI and robotics systems are demonstrated to be free of bias mistakes, they are unsafe, and the use of self-learning neural networks trained on vast, unregulated sources of flawed internet data should be curtailed.[193]

Lack of transparency

Many AI systems are so complex that their designers cannot explain how they reach their decisions.[194]Particularly withdeep neural networks,in which there are a large amount of non-linearrelationships between inputs and outputs. But some popular explainability techniques exist.[195]

It is impossible to be certain that a program is operating correctly if no one knows how exactly it works. There have been many cases where a machine learning program passed rigorous tests, but nevertheless learned something different than what the programmers intended. For example, a system that could identify skin diseases better than medical professionals was found to actually have a strong tendency to classify images with aruleras "cancerous", because pictures of malignancies typically include a ruler to show the scale.[196]Another machine learning system designed to help effectively allocate medical resources was found to classify patients with asthma as being at "low risk" of dying from pneumonia. Having asthma is actually a severe risk factor, but since the patients having asthma would usually get much more medical care, they were relatively unlikely to die according to the training data. The correlation between asthma and low risk of dying from pneumonia was real, but misleading.[197]

People who have been harmed by an algorithm's decision have a right to an explanation.[198]Doctors, for example, are expected to clearly and completely explain to their colleagues the reasoning behind any decision they make. Early drafts of the European Union'sGeneral Data Protection Regulationin 2016 included an explicit statement that this right exists.[m]Industry experts noted that this is an unsolved problem with no solution in sight. Regulators argued that nevertheless the harm is real: if the problem has no solution, the tools should not be used.[199]

DARPAestablished theXAI( "Explainable Artificial Intelligence" ) program in 2014 to try and solve these problems.[200]

There are several possible solutions to the transparency problem. SHAP tried to solve the transparency problems by visualising the contribution of each feature to the output.[201]LIME can locally approximate a model with a simpler, interpretable model.[202]Multitask learningprovides a large number of outputs in addition to the target classification. These other outputs can help developers deduce what the network has learned.[203]Deconvolution,DeepDreamand othergenerativemethods can allow developers to see what different layers of a deep network have learned and produce output that can suggest what the network is learning.[204]

Bad actors and weaponized AI

Artificial intelligence provides a number of tools that are useful tobad actors,such asauthoritarian governments,terrorists,criminalsorrogue states.

A lethal autonomous weapon is a machine that locates, selects and engages human targets without human supervision.[n]Widely available AI tools can be used by bad actors to develop inexpensive autonomous weapons and, if produced at scale, they are potentiallyweapons of mass destruction.[206]Even when used in conventional warfare, it is unlikely that they will be unable to reliably choose targets and could potentiallykill an innocent person.[206]In 2014, 30 nations (including China) supported a ban on autonomous weapons under theUnited Nations'Convention on Certain Conventional Weapons,however theUnited Statesand others disagreed.[207]By 2015, over fifty countries were reported to be researching battlefield robots.[208]

AI tools make it easier forauthoritarian governmentsto efficiently control their citizens in several ways.Faceandvoice recognitionallow widespreadsurveillance.Machine learning,operating this data, canclassifypotential enemies of the state and prevent them from hiding.Recommendation systemscan precisely targetpropagandaandmisinformationfor maximum effect.Deepfakesandgenerative AIaid in producing misinformation. Advanced AI can make authoritariancentralized decision makingmore competitive than liberal and decentralized systems such asmarkets.It lowers the cost and difficulty ofdigital warfareandadvanced spyware.[209]All these technologies have been available since 2020 or earlier—AIfacial recognition systemsare already being used formass surveillancein China.[210][211]

There many other ways that AI is expected to help bad actors, some of which can not be foreseen. For example, machine-learning AI is able to design tens of thousands of toxic molecules in a matter of hours.[212]

Reliance on industry giants

Training AI systems requires an enormous amount of computing power. Usually onlyBig Techcompanies have the financial resources to make such investments. Smaller startups such asCohereandOpenAIend up buying access todata centersfromGoogleandMicrosoftrespectively.[213]

Technological unemployment

Economists have frequently highlighted the risks of redundancies from AI, and speculated about unemployment if there is no adequate social policy for full employment.[214]

In the past, technology has tended to increase rather than reduce total employment, but economists acknowledge that "we're in uncharted territory" with AI.[215]A survey of economists showed disagreement about whether the increasing use of robots and AI will cause a substantial increase in long-termunemployment,but they generally agree that it could be a net benefit ifproductivitygains areredistributed.[216]Risk estimates vary; for example, in the 2010s, Michael Osborne andCarl Benedikt Freyestimated 47% of U.S. jobs are at "high risk" of potential automation, while an OECD report classified only 9% of U.S. jobs as "high risk".[o][218]The methodology of speculating about future employment levels has been criticised as lacking evidential foundation, and for implying that technology, rather than social policy, creates unemployment, as opposed to redundancies.[214]In April 2023, it was reported that 70% of the jobs for Chinese video game illustrators had been eliminated by generative artificial intelligence.[219][220]

Unlike previous waves of automation, many middle-class jobs may be eliminated by artificial intelligence;The Economiststated in 2015 that "the worry that AI could do to white-collar jobs what steam power did to blue-collar ones during the Industrial Revolution" is "worth taking seriously".[221]Jobs at extreme risk range fromparalegalsto fast food cooks, while job demand is likely to increase for care-related professions ranging from personal healthcare to the clergy.[222]

From the early days of the development of artificial intelligence, there have been arguments, for example, those put forward byJoseph Weizenbaum,about whether tasks that can be done by computers actually should be done by them, given the difference between computers and humans, and between quantitative calculation and qualitative, value-based judgement.[223]

Existential risk

It has been argued AI will become so powerful that humanity may irreversibly lose control of it. This could, as physicistStephen Hawkingstated, "spell the end of the human race".[224]This scenario has been common in science fiction, when a computer or robot suddenly develops a human-like "self-awareness" (or "sentience" or "consciousness" ) and becomes a malevolent character.[p]These sci-fi scenarios are misleading in several ways.

First, AI does not require human-like "sentience"to be an existential risk. Modern AI programs are given specific goals and use learning and intelligence to achieve them. PhilosopherNick Bostromargued that if one givesalmost anygoal to a sufficiently powerful AI, it may choose to destroy humanity to achieve it (he used the example of apaperclip factory manager).[226]Stuart Russellgives the example of household robot that tries to find a way to kill its owner to prevent it from being unplugged, reasoning that "you can't fetch the coffee if you're dead."[227]In order to be safe for humanity, asuperintelligencewould have to be genuinelyalignedwith humanity's morality and values so that it is "fundamentally on our side".[228]

Second,Yuval Noah Harariargues that AI does not require a robot body or physical control to pose an existential risk. The essential parts of civilization are not physical. Things likeideologies,law,government,moneyand theeconomyare made oflanguage;they exist because there are stories that billions of people believe. The current prevalence ofmisinformationsuggests that an AI could use language to convince people to believe anything, even to take actions that are destructive.[229]

The opinions amongst experts and industry insiders are mixed, with sizable fractions both concerned and unconcerned by risk from eventual superintelligent AI.[230]Personalities such asStephen Hawking,Bill Gates,andElon Musk,[231]as well as AI pioneers such asGeoffrey Hinton,Yoshua Bengio,Demis Hassabis,andSam Altman,have expressed concerns about existential risk from AI.

In 2023, many leading AI experts issuedthe joint statementthat "Mitigating the risk of extinction from AI should be a global priority alongside other societal-scale risks such as pandemics and nuclear war".[232]

Other researchers, however, spoke in favor of a less dystopian view. AI pioneerJuergen Schmidhuberdid not sign the joint statement, emphasising that in 95% of all cases, AI research is about making "human lives longer and healthier and easier."[233]While the tools that are now being used to improve lives can also be used by bad actors, "they can also be used against the bad actors."[234][235]Andrew Ngalso argued that "it's a mistake to fall for the doomsday hype on AI—and that regulators who do will only benefit vested interests."[236]Yann LeCun"scoffs at his peers' dystopian scenarios of supercharged misinformation and even, eventually, human extinction."[237]In the early 2010s, experts argued that the risks are too distant in the future to warrant research or that humans will be valuable from the perspective of a superintelligent machine.[238]However, after 2016, the study of current and future risks and possible solutions became a serious area of research.[239]

Ethical machines and alignment

Friendly AI are machines that have been designed from the beginning to minimize risks and to make choices that benefit humans.Eliezer Yudkowsky,who coined the term, argues that developing friendly AI should be a higher research priority: it may require a large investment and it must be completed before AI becomes an existential risk.[240]

Machines with intelligence have the potential to use their intelligence to make ethical decisions. The field of machine ethics provides machines with ethical principles and procedures for resolving ethical dilemmas.[241] The field of machine ethics is also called computational morality,[241] and was founded at anAAAIsymposium in 2005.[242]

Other approaches includeWendell Wallach's "artificial moral agents"[243]andStuart J. Russell'sthree principlesfor developing provably beneficial machines.[244]

Open source

Active organizations in the AI open-source community includeHugging Face,[245]Google,[246]EleutherAIandMeta.[247]Various AI models, such asLlama 2,MistralorStable Diffusion,have been made open-weight,[248][249]meaning that their architecture and trained parameters (the "weights" ) are publicly available. Open-weight models can be freelyfine-tuned,which allows companies to specialize them with their own data and for their own use-case.[250]Open-weight models are useful for research and innovation but can also be misused. Since they can be fine-tuned, any built-in security measure, such as objecting to harmful requests, can be trained away until it becomes ineffective. Some researchers warn that future AI models may develop dangerous capabilities (such as the potential to drastically facilitatebioterrorism), and that once released on the Internet, they can't be deleted everywhere if needed. They recommend pre-release audits and cost-benefit analyses.[251]

Frameworks

Artificial Intelligence projects can have their ethical permissibility tested while designing, developing, and implementing an AI system. An AI framework such as the Care and Act Framework containing the SUM values—developed by theAlan Turing Institutetests projects in four main areas:[252][253]

  • Respectthe dignity of individual people
  • Connectwith other people sincerely, openly, and inclusively
  • Carefor the wellbeing of everyone
  • Protectsocial values, justice, and the public interest

Other developments in ethical frameworks include those decided upon during theAsilomar Conference,the Montreal Declaration for Responsible AI, and the IEEE's Ethics of Autonomous Systems initiative, among others;[254]however, these principles do not go without their criticisms, especially regards to the people chosen contributes to these frameworks.[255]

Promotion of the wellbeing of the people and communities that these technologies affect requires consideration of the social and ethical implications at all stages of AI system design, development and implementation, and collaboration between job roles such as data scientists, product managers, data engineers, domain experts, and delivery managers.[256]

The AI Safety Institute in the UK has released a testing toolset called 'Inspect' for AI safety evaluations available under a MIT open-source licence which is freely available on GitHub and can be improved with third-party packages. It can be used to evaluate AI models in a range of areas including core knowledge, ability to reason, and autonomous capabilities.[257]

Voicing concerns about issues including theexistential risk from artificial general intelligence,[258]in May 2023, Geoffrey Hinton announced his resignation from Google in order to be able to "freely speak out about the risks of A.I."[259]He stressed that in order to avoid the worst outcomes, establishing safety guidelines will require cooperation among those competing in use of A.I.[260]

Regulation

AI Safety Summit
The first globalAI Safety Summitwas held in 2023 with a declaration calling for international co-operation

The regulation of artificial intelligence is the development of public sector policies and laws for promoting and regulating artificial intelligence (AI); it is therefore related to the broader regulation of algorithms.[261]The regulatory and policy landscape for AI is an emerging issue in jurisdictions globally.[262]According to AI Index atStanford,the annual number of AI-related laws passed in the 127 survey countries jumped from one passed in 2016 to 37 passed in 2022 alone.[263][264]Between 2016 and 2020, more than 30 countries adopted dedicated strategies for AI.[265]Most EU member states had released national AI strategies, as had Canada, China, India, Japan, Mauritius, the Russian Federation, Saudi Arabia, United Arab Emirates, U.S., and Vietnam. Others were in the process of elaborating their own AI strategy, including Bangladesh, Malaysia and Tunisia.[265]TheGlobal Partnership on Artificial Intelligencewas launched in June 2020, stating a need for AI to be developed in accordance with human rights and democratic values, to ensure public confidence and trust in the technology.[265]Henry Kissinger,Eric Schmidt,andDaniel Huttenlocherpublished a joint statement in November 2021 calling for a government commission to regulate AI.[266]In 2023, OpenAI leaders published recommendations for the governance of superintelligence, which they believe may happen in less than 10 years.[267]In 2023, the United Nations also launched an advisory body to provide recommendations on AI governance; the body comprises technology company executives, governments officials and academics.[268]

In a 2022Ipsossurvey, attitudes towards AI varied greatly by country; 78% of Chinese citizens, but only 35% of Americans, agreed that "products and services using AI have more benefits than drawbacks".[263]A 2023Reuters/Ipsos poll found that 61% of Americans agree, and 22% disagree, that AI poses risks to humanity.[269]In a 2023Fox Newspoll, 35% of Americans thought it "very important", and an additional 41% thought it "somewhat important", for the federal government to regulate AI, versus 13% responding "not very important" and 8% responding "not at all important".[270][271]

In November 2023, the first globalAI Safety Summitwas held inBletchley Parkin the UK to discuss the near and far term risks of AI and the possibility of mandatory and voluntary regulatory frameworks.[272]28 countries including the United States, China, and the European Union issued a declaration at the start of the summit, calling for international co-operation to manage the challenges and risks of artificial intelligence.[273][274]In May 2024 at theAI Seoul Summit,16 global AI tech companies agreed to safety commitments on the development of AI.[275][276]

History

The study of mechanical or "formal" reasoning began with philosophers and mathematicians in antiquity. The study of logic led directly toAlan Turing'stheory of computation,which suggested that a machine, by shuffling symbols as simple as "0" and "1", could simulate any conceivable form of mathematical reasoning.[277][5]This, along with concurrent discoveries incybernetics,information theoryandneurobiology,led researchers to consider the possibility of building an "electronic brain".[q] They developed several areas of research that would become part of AI,[279] such asMcCullouchandPittsdesign for "artificial neurons" in 1943,[280]and Turing's influential 1950 paper 'Computing Machinery and Intelligence', which introduced theTuring testand showed that "machine intelligence" was plausible.[281][5]

The field of AI research was founded ata workshopatDartmouth Collegein 1956.[r][6]The attendees became the leaders of AI research in the 1960s.[s]They and their students produced programs that the press described as "astonishing":[t]computers were learningcheckersstrategies, solving word problems in algebra, provinglogical theoremsand speaking English.[u][9]Artificial intelligence laboratories were set up at a number of British and U.S. Universities in the latter 1950s and early 1960s.[5]

Researchers in the 1960s and the 1970s were convinced that their methods would eventually succeed in creating a machine withgeneral intelligenceand considered this the goal of their field.[285]Herbert Simonpredicted, "machines will be capable, within twenty years, of doing any work a man can do".[286]Marvin Minskyagreed, writing, "within a generation... the problem of creating 'artificial intelligence' will substantially be solved".[287]They had, however, underestimated the difficulty of the problem.[v]In 1974, both the U.S. and British governments cut off exploratory research in response to thecriticismofSir James Lighthill[289]and ongoing pressure from the U.S. Congress tofund more productive projects.[290]Minsky's andPapert's bookPerceptronswas understood as proving thatartificial neural networkswould never be useful for solving real-world tasks, thus discrediting the approach altogether.[291]The "AI winter",a period when obtaining funding for AI projects was difficult, followed.[11]

In the early 1980s, AI research was revived by the commercial success ofexpert systems,[292]a form of AI program that simulated the knowledge and analytical skills of human experts. By 1985, the market for AI had reached over a billion dollars. At the same time, Japan'sfifth generation computerproject inspired the U.S. and British governments to restore funding foracademic research.[10]However, beginning with the collapse of theLisp Machinemarket in 1987, AI once again fell into disrepute, and a second, longer-lasting winter began.[12]

Up to this point, most of AI's funding had gone to projects that used high-levelsymbolsto representmental objectslike plans, goals, beliefs, and known facts. In the 1980s, some researchers began to doubt that this approach would be able to imitate all the processes of human cognition, especiallyperception,robotics,learningandpattern recognition,[293]and began to look into "sub-symbolic" approaches.[294]Rodney Brooksrejected "representation" in general and focussed directly on engineering machines that move and survive.[w]Judea Pearl,Lofti Zadehand others developed methods that handled incomplete and uncertain information by making reasonable guesses rather than precise logic.[91][299]But the most important development was the revival of "connectionism",including neural network research, byGeoffrey Hintonand others.[300]In 1990,Yann LeCunsuccessfully showed thatconvolutional neural networkscan recognize handwritten digits, the first of many successful applications of neural networks.[301]

AI gradually restored its reputation in the late 1990s and early 21st century by exploiting formal mathematical methods and by finding specific solutions to specific problems. This "narrow"and" formal "focus allowed researchers to produce verifiable results and collaborate with other fields (such asstatistics,economicsandmathematics).[302]By 2000, solutions developed by AI researchers were being widely used, although in the 1990s they were rarely described as "artificial intelligence".[303] However, several academic researchers became concerned that AI was no longer pursuing its original goal of creating versatile, fully intelligent machines. Beginning around 2002, they founded the subfield ofartificial general intelligence(or "AGI" ), which had several well-funded institutions by the 2010s.[16]

Deep learningbegan to dominate industry benchmarks in 2012 and was adopted throughout the field.[13] For many specific tasks, other methods were abandoned.[x] Deep learning's success was based on both hardware improvements (faster computers,[305]graphics processing units,cloud computing[306]) and access tolarge amounts of data[307](including curated datasets,[306]such asImageNet). Deep learning's success led to an enormous increase in interest and funding in AI.[y]The amount of machine learning research (measured by total publications) increased by 50% in the years 2015–2019.[265]

In 2016, issues offairnessand the misuse of technology were catapulted into center stage at machine learning conferences, publications vastly increased, funding became available, and many researchers re-focussed their careers on these issues. Thealignment problembecame a serious field of academic study.[239]

In the late teens and early 2020s,AGIcompanies began to deliver programs that created enormous interest. In 2015,AlphaGo,developed byDeepMind,beat the world championGo player.The program was taught only the rules of the game and developed strategy by itself.GPT-3is alarge language modelthat was released in 2020 byOpenAIand is capable of generating high-quality human-like text.[308]These programs, and others, inspired an aggressiveAI boom,where large companies began investing billions in AI research. According to AI Impacts, about $50 billion annually was invested in "AI" around 2022 in the U.S. alone and about 20% of the new U.S. Computer Science PhD graduates have specialized in "AI".[309] About 800,000 "AI" -related U.S. job openings existed in 2022.[310]

Philosophy

Defining artificial intelligence

Alan Turingwrote in 1950 "I propose to consider the question 'can machines think'?"[311]He advised changing the question from whether a machine "thinks", to "whether or not it is possible for machinery to show intelligent behaviour".[311]He devised the Turing test, which measures the ability of a machine to simulate human conversation.[281]Since we can only observe the behavior of the machine, it does not matter if it is "actually" thinking or literally has a "mind". Turing notes thatwe can not determine these things about other peoplebut "it is usual to have a polite convention that everyone thinks."[312]

RussellandNorvigagree with Turing that intelligence must be defined in terms of external behavior, not internal structure.[1]However, they are critical that the test requires the machine to imitate humans. "Aeronautical engineeringtexts, "they wrote," do not define the goal of their field as making 'machines that fly so exactly likepigeonsthat they can fool other pigeons.'"[313]AI founderJohn McCarthyagreed, writing that "Artificial intelligence is not, by definition, simulation of human intelligence".[314]

McCarthy defines intelligence as "the computational part of the ability to achieve goals in the world".[315]Another AI founder,Marvin Minskysimilarly describes it as "the ability to solve hard problems".[316]The leading AI textbook defines it as the study of agents that perceive their environment and take actions that maximize their chances of achieving defined goals.[1]These definitions view intelligence in terms of well-defined problems with well-defined solutions, where both the difficulty of the problem and the performance of the program are direct measures of the "intelligence" of the machine—and no other philosophical discussion is required, or may not even be possible.

Another definition has been adopted by Google,[317]a major practitioner in the field of AI. This definition stipulates the ability of systems to synthesize information as the manifestation of intelligence, similar to the way it is defined in biological intelligence.

Evaluating approaches to AI

No established unifying theory orparadigmhas guided AI research for most of its history.[z]The unprecedented success of statistical machine learning in the 2010s eclipsed all other approaches (so much so that some sources, especially in the business world, use the term "artificial intelligence" to mean "machine learning with neural networks" ). This approach is mostlysub-symbolic,softandnarrow.Critics argue that these questions may have to be revisited by future generations of AI researchers.

Symbolic AI and its limits

Symbolic AI(or "GOFAI")[319]simulated the high-level conscious reasoning that people use when they solve puzzles, express legal reasoning and do mathematics. They were highly successful at "intelligent" tasks such as algebra or IQ tests. In the 1960s, Newell and Simon proposed thephysical symbol systems hypothesis:"A physical symbol system has the necessary and sufficient means of general intelligent action."[320]

However, the symbolic approach failed on many tasks that humans solve easily, such as learning, recognizing an object or commonsense reasoning.Moravec's paradoxis the discovery that high-level "intelligent" tasks were easy for AI, but low level "instinctive" tasks were extremely difficult.[321]PhilosopherHubert Dreyfushadarguedsince the 1960s that human expertise depends on unconscious instinct rather than conscious symbol manipulation, and on having a "feel" for the situation, rather than explicit symbolic knowledge.[322]Although his arguments had been ridiculed and ignored when they were first presented, eventually, AI research came to agree with him.[aa][21]

The issue is not resolved:sub-symbolicreasoning can make many of the same inscrutable mistakes that human intuition does, such asalgorithmic bias.Critics such asNoam Chomskyargue continuing research into symbolic AI will still be necessary to attain general intelligence,[324][325]in part because sub-symbolic AI is a move away fromexplainable AI:it can be difficult or impossible to understand why a modern statistical AI program made a particular decision. The emerging field ofneuro-symbolic artificial intelligenceattempts to bridge the two approaches.

Neat vs. scruffy

"Neats" hope that intelligent behavior is described using simple, elegant principles (such aslogic,optimization,orneural networks). "Scruffies" expect that it necessarily requires solving a large number of unrelated problems. Neats defend their programs with theoretical rigor, scruffies rely mainly on incremental testing to see if they work. This issue was actively discussed in the 1970s and 1980s,[326]but eventually was seen as irrelevant. Modern AI has elements of both.

Soft vs. hard computing

Finding a provably correct or optimal solution isintractablefor many important problems.[20]Soft computing is a set of techniques, includinggenetic algorithms,fuzzy logicand neural networks, that are tolerant of imprecision, uncertainty, partial truth and approximation. Soft computing was introduced in the late 1980s and most successful AI programs in the 21st century are examples of soft computing with neural networks.

Narrow vs. general AI

AI researchers are divided as to whether to pursue the goals of artificial general intelligence andsuperintelligencedirectly or to solve as many specific problems as possible (narrow AI) in hopes these solutions will lead indirectly to the field's long-term goals.[327][328]General intelligence is difficult to define and difficult to measure, and modern AI has had more verifiable successes by focusing on specific problems with specific solutions. The experimental sub-field of artificial general intelligence studies this area exclusively.

Machine consciousness, sentience, and mind

Thephilosophy of minddoes not know whether a machine can have amind,consciousnessandmental states,in the same sense that human beings do. This issue considers the internal experiences of the machine, rather than its external behavior. Mainstream AI research considers this issue irrelevant because it does not affect the goals of the field: to build machines that can solve problems using intelligence.RussellandNorvigadd that "[t]he additional project of making a machine conscious in exactly the way humans are is not one that we are equipped to take on."[329]However, the question has become central to the philosophy of mind. It is also typically the central question at issue inartificial intelligence in fiction.

Consciousness

David Chalmersidentified two problems in understanding the mind, which he named the "hard" and "easy" problems of consciousness.[330]The easy problem is understanding how the brain processes signals, makes plans and controls behavior. The hard problem is explaining how thisfeelsor why it should feel like anything at all, assuming we are right in thinking that it truly does feel like something (Dennett's consciousness illusionism says this is an illusion). While humaninformation processingis easy to explain, humansubjective experienceis difficult to explain. For example, it is easy to imagine a color-blind person who has learned to identify which objects in their field of view are red, but it is not clear what would be required for the person toknow what red looks like.[331]

Computationalism and functionalism

Computationalism is the position in thephilosophy of mindthat the human mind is an information processing system and that thinking is a form of computing. Computationalism argues that the relationship between mind and body is similar or identical to the relationship between software and hardware and thus may be a solution to themind–body problem.This philosophical position was inspired by the work of AI researchers and cognitive scientists in the 1960s and was originally proposed by philosophersJerry FodorandHilary Putnam.[332]

PhilosopherJohn Searlecharacterized this position as "strong AI":"The appropriately programmed computer with the right inputs and outputs would thereby have a mind in exactly the same sense human beings have minds. "[ab]Searle counters this assertion with his Chinese room argument, which attempts to show that, even if a machine perfectly simulates human behavior, there is still no reason to suppose it also has a mind.[336]

AI welfare and rights

It is difficult or impossible to reliably evaluate whether an advancedAI is sentient(has the ability to feel), and if so, to what degree.[337]But if there is a significant chance that a given machine can feel and suffer, then it may be entitled to certain rights or welfare protection measures, similarly to animals.[338][339]Sapience(a set of capacities related to high intelligence, such as discernment orself-awareness) may provide another moral basis for AI rights.[338]Robot rightsare also sometimes proposed as a practical way to integrate autonomous agents into society.[340]

In 2017, the European Union considered granting "electronic personhood" to some of the most capable AI systems. Similarly to the legal status of companies, it would have conferred rights but also responsibilities.[341]Critics argued in 2018 that granting rights to AI systems would downplay the importance ofhuman rights,and that legislation should focus on user needs rather than speculative futuristic scenarios. They also noted that robots lacked the autonomy to take part to society on their own.[342][343]

Progress in AI increased interest in the topic. Proponents of AI welfare and rights often argue that AI sentience, if it emerges, would be particularly easy to deny. They warn that this may be amoral blind spotanalogous toslaveryorfactory farming,which could lead tolarge-scale sufferingif sentient AI is created and carelessly exploited.[339][338]

Future

Superintelligence and the singularity

Asuperintelligenceis a hypothetical agent that would possess intelligence far surpassing that of the brightest and most gifted human mind.[328]

If research intoartificial general intelligenceproduced sufficiently intelligent software, it might be able toreprogram and improve itself.The improved software would be even better at improving itself, leading to whatI. J. Goodcalled an "intelligence explosion"andVernor Vingecalled a "singularity".[344]

However, technologies cannot improve exponentially indefinitely, and typically follow anS-shaped curve,slowing when they reach the physical limits of what the technology can do.[345]

Transhumanism

Robot designerHans Moravec,cyberneticistKevin Warwick,and inventorRay Kurzweilhave predicted that humans and machines will merge in the future intocyborgsthat are more capable and powerful than either. This idea, called transhumanism, has roots inAldous HuxleyandRobert Ettinger.[346]

Edward Fredkinargues that "artificial intelligence is the next stage in evolution", an idea first proposed bySamuel Butler's "Darwin among the Machines"as far back as 1863, and expanded upon byGeorge Dysonin his 1998 bookDarwin Among the Machines: The Evolution of Global Intelligence.[347]

In fiction

The word "robot" itself was coined byKarel Čapekin his 1921 playR.U.R.,the title standing for "Rossum's Universal Robots"

Thought-capable artificial beings have appeared as storytelling devices since antiquity,[348]and have been a persistent theme inscience fiction.[349]

A commontropein these works began withMary Shelley'sFrankenstein,where a human creation becomes a threat to its masters. This includes such works asArthur C. Clarke'sandStanley Kubrick's2001: A Space Odyssey(both 1968), withHAL 9000,the murderous computer in charge of theDiscovery Onespaceship, as well asThe Terminator(1984) andThe Matrix(1999). In contrast, the rare loyal robots such as Gort fromThe Day the Earth Stood Still(1951) and Bishop fromAliens(1986) are less prominent in popular culture.[350]

Isaac Asimovintroduced theThree Laws of Roboticsin many stories, most notably with the "Multivac"super-intelligent computer. Asimov's laws are often brought up during lay discussions of machine ethics;[351]while almost all artificial intelligence researchers are familiar with Asimov's laws through popular culture, they generally consider the laws useless for many reasons, one of which is their ambiguity.[352]

Several works use AI to force us to confront the fundamental question of what makes us human, showing us artificial beings that havethe ability to feel,and thus to suffer. This appears inKarel Čapek'sR.U.R.,the filmsA.I. Artificial IntelligenceandEx Machina,as well as the novelDo Androids Dream of Electric Sheep?,byPhilip K. Dick.Dick considers the idea that our understanding of human subjectivity is altered by technology created with artificial intelligence.[353]

See also

Explanatory notes

  1. ^abThis list of intelligent traits is based on the topics covered by the major AI textbooks, including:Russell & Norvig (2021),Luger & Stubblefield (2004),Poole, Mackworth & Goebel (1998)andNilsson (1998)
  2. ^abThis list of tools is based on the topics covered by the major AI textbooks, including:Russell & Norvig (2021),Luger & Stubblefield (2004),Poole, Mackworth & Goebel (1998)andNilsson (1998)
  3. ^It is among the reasons thatexpert systemsproved to be inefficient for capturing knowledge.[35][36]
  4. ^ "Rational agent" is general term used ineconomics,philosophyand theoretical artificial intelligence. It can refer to anything that directs its behavior to accomplish goals, such as a person, an animal, a corporation, a nation, or in the case of AI, a computer program.
  5. ^Alan Turingdiscussed the centrality of learning as early as 1950, in his classic paper "Computing Machinery and Intelligence".[47]In 1956, at the original Dartmouth AI summer conference,Ray Solomonoffwrote a report on unsupervised probabilistic machine learning: "An Inductive Inference Machine".[48]
  6. ^SeeAI winter § Machine translation and the ALPAC report of 1966
  7. ^ Compared with symbolic logic, formal Bayesian inference is computationally expensive. For inference to be tractable, most observations must beconditionally independentof one another.AdSenseuses a Bayesian network with over 300 million edges to learn which ads to serve.[98]
  8. ^Expectation–maximization, one of the most popular algorithms in machine learning, allows clustering in the presence of unknownlatent variables.[100]
  9. ^ Some form of deep neural networks (without a specific learning algorithm) were described by: Alan Turing(1948);[119] Frank Rosenblatt(1957);[119] Karl SteinbuchandRoger David Joseph(1961).[120] Deep or recurrent networks that learned (or used gradient descent) were developed by: Ernst IsingandWilhelm Lenz(1925);[121] Oliver Selfridge(1959);[120] Alexey IvakhnenkoandValentin Lapa(1965);[121] Kaoru Nakano(1977);[122] Shun-Ichi Amari(1972);[122] John Joseph Hopfield(1982).[122] Backpropagation was independently discovered by: Henry J. Kelley(1960);[119] Arthur E. Bryson(1962);[119] Stuart Dreyfus(1962);[119] Arthur E. BrysonandYu-Chi Ho(1969);[119] Seppo Linnainmaa(1970);[123] Paul Werbos(1974).[119] In fact, backpropagation and gradient descent are straight forward applications ofGottfried Leibniz'chain rulein calculus (1676),[124]and is essentially identical (for one layer) to themethod of least squares,developed independently byJohann Carl Friedrich Gauss(1795) andAdrien-Marie Legendre(1805).[125]There are probably many others, yet to be discovered by historians of science.
  10. ^Geoffrey Hintonsaid, of his work on neural networks in the 1990s, "our labeled datasets were thousands of times too small. [And] our computers were millions of times too slow"[126]
  11. ^IncludingJon Kleinberg(Cornell University), Sendhil Mullainathan (University of Chicago), Cynthia Chouldechova (Carnegie Mellon) and Sam Corbett-Davis (Stanford)[187]
  12. ^Moritz Hardt (a director at theMax Planck Institute for Intelligent Systems) argues that machine learning "is fundamentally the wrong tool for a lot of domains, where you're trying to design interventions and mechanisms that change the world."[192]
  13. ^When the law was passed in 2018, it still contained a form of this provision.
  14. ^This is theUnited Nations' definition, and includes things likeland minesas well.[205]
  15. ^See table 4; 9% is both the OECD average and the U.S. average.[217]
  16. ^Sometimes called a "robopocalypse".[225]
  17. ^"Electronic brain" was the term used by the press around this time.[277][278]
  18. ^ Daniel Crevier wrote, "the conference is generally recognized as the official birthdate of the new science."[282]RussellandNorvigcalled the conference "the inception of artificial intelligence."[280]
  19. ^ RussellandNorvigwrote "for the next 20 years the field would be dominated by these people and their students."[283]
  20. ^ RussellandNorvigwrote "it was astonishing whenever a computer did anything kind of smartish".[284]
  21. ^ The programs described areArthur Samuel's checkers program for theIBM 701,Daniel Bobrow'sSTUDENT,NewellandSimon'sLogic TheoristandTerry Winograd'sSHRDLU.
  22. ^RussellandNorvigwrite: "in almost all cases, these early systems failed on more difficult problems"[288]
  23. ^ Embodiedapproaches to AI[295]were championed byHans Moravec[296]andRodney Brooks[297]and went by many names:Nouvelle AI.[297]Developmental robotics,[298]
  24. ^Matteo Wong wrote inThe Atlantic:"Whereas for decades, computer-science fields such as natural-language processing, computer vision, and robotics used extremely different methods, now they all use a programming method called" deep learning. "As a result, their code and approaches have become more similar, and their models are easier to integrate into one another."[304]
  25. ^Jack Clark wrote inBloomberg:"After a half-decade of quiet breakthroughs in artificial intelligence, 2015 has been a landmark year. Computers are smarter and learning faster than ever", and noted that the number of software projects that use machine learning atGoogleincreased from a "sporadic usage" in 2012 to more than 2,700 projects in 2015.[306]
  26. ^Nils Nilssonwrote in 1983: "Simply put, there is wide disagreement in the field about what AI is all about."[318]
  27. ^ Daniel Crevier wrote that "time has proven the accuracy and perceptiveness of some of Dreyfus's comments. Had he formulated them less aggressively, constructive actions they suggested might have been taken much earlier."[323]
  28. ^ Searle presented this definition of "Strong AI" in 1999.[333]Searle's original formulation was "The appropriately programmed computer really is a mind, in the sense that computers given the right programs can be literally said to understand and have other cognitive states."[334]Strong AI is defined similarly byRussellandNorvig:"Stong AI – the assertion that machines that do so areactuallythinking (as opposed tosimulatingthinking). "[335]

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AI textbooks

The two most widely used textbooks in 2023. (See theOpen Syllabus).

These were the four of the most widely used AI textbooks in 2008:

Later editions.

History of AI

Other sources

Further reading

External links