Artificial Intelligence

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playing against IBM Deep Blue, the first machine to win a chess match against a reigning world champion.

The modern definition of artificial intelligence (or AI) is "the study and design of intelligent agents" where an intelligent agent is a system that perceives its environment and takes actions which maximizes its chances of success.Textbooks that define AI this way include and (who prefer the term "rational agent") and write "The whole-agent view is now widely accepted in the field" John McCarthy (computer scientist), who coined the term in 1956,Although there is some controversy on this point (see ), John McCarthy states unequivocally "I came up with the term" in a c|net interview. (See Getting Machines to Think Like Us.)defines it as "the science and engineering of making intelligent machines."See WHAT IS ARTIFICIAL INTELLIGENCE? by John McCarthyOther names for the field have been proposed, such as computational intelligence,synthetic intelligenceor computational rationality.The term artificial intelligence is also used to describe a property of machines or programs: the intelligence (trait) that the system demonstrates.

AI research uses tools and insights from many fields, including computer science, psychology, philosophy, neuroscience, cognitive science, computational linguistics, operations research, computational economics, control theory, probability, optimization (mathematics) and logic.AI research also overlaps with tasks such as robotics, control systems, automated planning and scheduling, data mining, logistics, speech recognition, facial recognition system and many others.

History The field was born at a Dartmouth Conferences on the campus of Dartmouth College in the summer of 1956. and Those who attended would become the leaders of AI research for many decades, especially John McCarthy (computer scientist), Marvin Minsky, Allen Newell and Herbert Simon, who founded AI laboratories at MIT, CMU and Stanford. They and their students wrote programs that were, to most people, simply astonishing:Russell and Norvig write "it was astonishing whenever a computer did anything remotely clever." computers were solving word problems in algebra, proving logical theorems and speaking English., and . The programs described are Daniel Bobrow's STUDENT (computer program), Allen Newell and Herbert Simon's Logic Theorist and Terry Winograd's SHRDLU.By the middle 60s their research was heavily funded by DARPAand they would make extraordinary predictions about their work:

1965, H. A. Simon: "machines will be capable, within twenty years, of doing any work a man can do" quoted in
1967, Marvin Minsky: "Within a generation ... the problem of creating 'artificial intelligence' will substantially be solved." quoted in

These predictions, and many like them, would not come true. They had failed to anticipate the difficulty of some of the problems they faced: the lack of raw computer power,, , the intractability combinatorial explosion of their algorithms,the difficulty of representing commonsense knowledge and doing commonsense reasoning,, , (Introduction) and the incredible difficulty of perception and motion and see Moravec's paradoxand the failings of logic., and see the frame problem, qualification problem and ramification problem.In 1974, in response to the criticism of England's Sir James Lighthill and ongoing pressure from congress to fund more productive projects, DARPA cut off all undirected, exploratory research in AI. This was the first AI Winter., , under "Shift to Applied Research Increases Investment." and also see Howe, J. "Artificial Intelligence at Edinburgh University : a Perspective"

In the early 80s, the field was revived by the commercial success of expert systems and by 1985 the market for AI had reached more than a billion dollars. and and Marvin Minsky and others warned the community that enthusiasm for AI had spiraled out of control and that disappointment was sure to follow.Marvin Minsky was right. Beginning with the collapse of the Lisp Machine market in 1987, AI once again fell into disrepute, and a second, more lasting AI Winter began.

In the 90s AI achieved its greatest successes, albeit somewhat behind the scenes. Artificial intelligence was adopted throughout the technology industry, providing the heavy lifting for logistics, data mining, medical diagnosis and many other areas., under "Artificial Intelligence in the 90s"The success was due to several factors: the incredible power of computers today (see Moore's law), a greater emphasis on solving specific subproblems, the creation of new ties between AI and other fields working on similar problems, and above all a new commitment by researchers to solid mathematical methods and rigorous scientific standards.

Mechanisms Expert systems were one of the earliest types of AI system. They are built around automated inference engines including forward reasoning and backwards reasoning. Based on certain conditions ("if") the system infers certain consequences ("then").

In terms of consequences, AI applications can be divided into two types: classifiers ("if shiny then diamond") and controllers ("if shiny then pick up"). Controllers do however also classify conditions before inferring actions, and therefore classification forms a central part of most AI systems.

Classifier (mathematics) make use of pattern recognition for condition matching. In many cases this does not imply absolute, but rather the closest match. Techniques to achieve this divide roughly into two schools of thought: Conventional AI and Computational intelligence (CI).

Conventional AI research focuses on attempts to mimic human intelligence through symbol manipulation and symbolically structured knowledge bases. This approach limits the situations to which conventional AI can be applied. Lotfi Zadeh stated that "we are also in possession of computational tools which are far more effective in the conception and design of intelligent systems than the predicate-logic-based methods which form the core of traditional AI." These techniques, which include fuzzy logic, have become known as soft computing. These often biologically inspired methods stand in contrast to conventional AI and compensate for the shortcomings of symbolicism.J.-S. R. Jang, C.-T. Sun, E. Mizutani, (foreword L. Zadeh) "Neuro-Fuzzy and Soft Computing," Prentice Hall, 1997 These two methodologies have also been labeled as neats vs. scruffies, with neats emphasizing the use of logic and formal representation of knowledge while scruffies take an application-oriented heuristic bottom-up approach.G.F. Luger, W.A. Stubblefield "Artificial Intelligence and the Design of Expert Systems"

Classifiers Classifiers are functions that can be tuned according to examples, making them very attractive for use in AI. These examples are known as observations or patterns. In supervised learning, each pattern belongs to a certain predefined class. A class can be seen as a decision that has to be made. All the observations combined with their class labels are known as a data set.

When a new observation is received, that observation is classified based on previous experience. A classifier can be trained in various ways; there are mainly statistical and machine learning approaches.

A wide range of classifiers are available, each with its strengths and weaknesses. Classifier performance depends greatly on the characteristics of the data to be classified. There is no single classifier that works best on all given problems; this is also referred to as the "no free lunch" theorem. Various empirical tests have been performed to compare classifier performance and to find the characteristics of data that determine classifier performance. Determining a suitable classifier for a given problem is however still more an art than science.

The most widely used classifiers are the Artificial neural network, support vector machine, k-nearest neighbor algorithm, Gaussian mixture model, naive Bayes classifier, and decision tree.

Conventional AI Conventional AI mostly involves methods now classified as machine learning, characterized by formalism and statistical analysis. This is also known as symbolic AI, logical AI, Neats and GOFAI. (Also see semantics.) Methods include:

Expert systems: apply reasoning capabilities to reach a conclusion. An expert system can process large amounts of known information and provide conclusions based on them.
Case based reasoning: stores a set of problems and answers in an organized data structure called cases. A case based reasoning system upon being presented with a problem finds a case in its knowledge base that is most closely related to the new problem and presents its solutions as an output with suitable modifications.Hammond J, Kristian. Case-based planning: viewing planning as a memory task. Academic Press Perspectives In Artificial Intelligence; Vol 1. Pages: 277. 1989. ISBN 0-12-322060-2
Bayesian networks
Behavior based AI: a modular method of building AI systems by hand.

Computational intelligence Computational intelligence involves iterative development or learning (e.g., parameter tuning in connectionist systems). Learning is based on empirical data and is associated with non-symbolic AI, Scruffies and soft computing. Subjects in computational intelligence as defined by IEEE Computational Intelligence Society mainly include:

Artificial neural networks: trainable systems with very strong pattern recognition capabilities.
Fuzzy systems: techniques for reasoning under uncertainty, have been widely used in modern industrial and consumer product control systems; capable of working with concepts such as 'hot', 'cold', 'warm' and 'boiling'.
Evolutionary computation: applies biologically inspired concepts such as populations, mutation and survival of the fittest to generate increasingly better solutions to the problem. These methods most notably divide into evolutionary algorithms (e.g., genetic algorithms) and swarm intelligence (e.g., ant colony optimizations).

With hybrid intelligent systems, attempts are made to combine these two groups. Expert inference rules can be generated through neural network or production rules from statistical learning such as in ACT-R or CLARION (see References below). It is thought that the human brain uses multiple techniques to both formulate and cross-check results. Thus, Artificial intelligence systems integration is seen as promising and perhaps necessary for true AI,especially the integration of symbolic and connectionist models (e.g., as advocated byRon Sun).

AI programming languages and styles AI research has led to many advances in programming languages including the first list processing language by Allen Newell et al., Lisp programming language dialects, Planner programming language, Actor model, the Scientific Community Metaphor, Rete algorithm, and Rule engine languages.

GOFAI TEST research is often done in programming languages such as Prolog or Lisp programming language. Matlab and Lush programming language (a numerical dialect of Lisp) include many specialist probabilistic libraries for Bayesian systems. AI research often emphasises rapid development and prototyping, using such interpreted languages to empower rapid command-line testing and experimentation. Real-time systems are however likely to require dedicated optimized software.

Many expert systems are organized collections of if-then such statements, called AI production. These can include stochastic elements, producing intrinsic variation, or rely on variation produced in response to a dynamic environment.

Research challenges

The 800 million-Euro EUREKA Prometheus Project on driverless cars (1987-1995) showed that fast autonomous vehicles, notably those of Ernst Dickmanns and his team, can drive long distances (over 100 miles) in traffic, automatically recognizing and tracking other cars through computer vision, passing slower cars in the left lane. But the challenge of safe door-to-door autonomous driving in arbitrary environments will require additional research.

The DARPA Grand Challenge was a race for a $2 million prize where cars had to drive themselves over a hundred miles of challenging desert terrain without any communication with humans, using GPS, computers and a sophisticated array of sensors. In 2005, the winning vehicles completed all 132 miles of the course in just under seven hours. This was the first in a series of challenges aimed at a congressional mandate stating that by 2015 one-third of the operational ground combat vehicles of the US Armed Forces should be unmanned. Congressional Mandate DARPA For November 2007, DARPA introduced the DARPA Urban Challenge. The course will involve a sixty-mile urban area course. Darpa has secured the prize money for the challenge as $2 million for first place, $1 million for second and $500,000 for third.

A popular challenge amongst AI research groups is the RoboCup and Federation of International Robot-soccer Association annual international robot soccer competitions. Hiroaki Kitano has formulated the International RoboCup Federation challenge: "In 2050 a team of fully autonomous humanoid robot soccer players shall win the soccer game, comply with the official rule of the FIFA, against the winner of the most recent World Cup." The RoboCup2003 Presents: Humanoid Robots playing Soccer PRESS RELEASE: 2 June 2003

In the post-dot-com boom era, some search engine websites use a simple form of AI to provide answers to questions entered by the visitor.Questions such as What is the tallest building? can be entered into the search engine's input form, and a list of answers will be returned.

AI in other disciplines AI is not only seen in computer science and engineering. It is studied and applied in various different sectors.

Philosophy The philosophy of artificial intelligence debate ("can a man-made artifact be conscious?") is still a hot topic amongst AI philosophers. This involves philosophy of mind and the mind-body problem. Most notably Roger Penrose in his book The Emperor's New Mind and John Searle with his "Chinese room" thought experiment argue that true consciousness cannot be achieved by formal logic systems, while Douglas Hofstadter in Gödel, Escher, Bach and Daniel Dennett in Consciousness Explained argue in favour of Functionalism (philosophy of mind). In many strong AI supporters' opinions, artificial consciousness is considered the holy grail of artificial intelligence. Edsger Dijkstra famously opined that the debate had little importance: "The question of whether a computer can think is no more interesting than the question of whether a submarine can swim."

Epistemology, the study of knowledge, also makes contact with AI, as engineers find themselves debating similar questions to philosophers about how best to represent and use knowledge and information (e.g., semantic networks).

Neuro-psychology Techniques and technologies in AI which have been directly derived from neuroscience include neural networks, Hebbian learning and the relatively new field of Hierarchical Temporal Memory which simulates the architecture of the neocortex.

Computer Science Notable examples include the languages Lisp programming language and Prolog, which were invented for AI research but are now used for non-AI tasks. Hacker culture first sprang from AI laboratories, in particular the MIT AI Lab, home at various times to such luminaries as John McCarthy (computer scientist), Marvin Minsky, Seymour Papert (who developed Logo programming language there) and Terry Winograd (who abandoned AI after developing SHRDLU).

Business Banks use artificial intelligence systems to organize operations, invest in stocks, and manage properties. In August 2001, robots beat humans in a simulated stock trader competition (BBC News, 2001).{{cite web] 2001, networks that pattern their organization in mimicry of a brain's neurons, which have been found to excel in pattern recognition. [Financial institutions have long used such systems to detect charges or claims outside of the norm, flagging these for human investigation. Neural networks are also being widely deployed in homeland security, speech and text recognition, medical diagnosis (such as in Concept Processing technology in EMR software), data mining, and e-mail spam filtering.

Robots have become common in many industries. They are often given jobs that are considered dangerous to humans. Robots have proven effective in jobs that are very repetitive which may lead to mistakes or accidents due to a lapse in concentration and other jobs which humans may find degrading. General Motors uses around 16,000 robots for tasks such as painting, welding, and assembly. Japan is the leader in using and producing robots in the world. In 1995, 700,000 robots were in use worldwide; over 500,000 of which were from Japan. "Robot," Microsoft® Encarta® Online Encyclopedia 2006

Fiction In science fiction AI is often portrayed as an upcoming power trying to overthrow human authority, usually in the form of futuristic humanoid robots. Best known examples include the films The Terminator and The Matrix, as well as TV shows such as the re-imagined Battlestar Galactica series.

Another common theme is the suspicion and hatred by humanity for AIs and the AIs attempt to gain human acceptance. Films include Bicentennial Man, Artificial Intelligence: A.I. and The Iron Giant. This concept is also explored in the Uncanny Valley hypothesis.

Isaac Asimov wrote stories where engineers understood these potential problems and designed their robots accordingly. Positive examples of AIs include Robby from Forbidden Planet, R2D2, C3PO and Data (Star Trek)

The inevitability of the integration of AI into human society is also argued by some science/futurist writers such as Kevin Warwick and Hans Moravec and the manga Ghost in the Shell

Toys and games The 1990s saw some of the first attempts to mass-produce domestically aimed types of basic Artificial Intelligence for education, or leisure. This prospered greatly with the Digital Revolution, and helped introduce people, especially children, to a life of dealing with various types of AI, specifically in the form of Tamagotchis and Giga Pets, the Internet (example: basic search engine interfaces are one simple form), and the first widely released robot, Furby. A mere year later an improved type of domestic robot was released in the form of Aibo, a robotic dog with intelligent features and autonomy.

List of applications Typical problems to which AI methods are applied:

Pattern recognition

Artificial Creativity

Computer vision, Virtual reality and Image processing
Diagnosis (artificial intelligence)
Game theory and Strategic planning
Game artificial intelligence and Computer game bot
Natural language processing, Translation and Chatterbots
Non-linear control and Robotics

Other fields in which AI methods are implemented:

Artificial life
Automated reasoning
Automation
Biologically-inspired computing
Colloquis
Concept mining
Data mining
Knowledge representation
Semantic Web
E-mail spam filtering

Robotics

Hybrid intelligent system
Intelligent agent
Intelligent control
Litigation

Lists of researchers, projects & publications

See also Main list: List of basic artificial intelligence topics

History of artificial intelligence
AI effect
AI winter
Artificial intelligence systems integration
Association for the Advancement of Artificial Intelligence
Autonomous foraging
Cognitive science
Embodied agent
Fifth generation computer
Friendly artificial intelligence
Generative systems
German Research Centre for Artificial Intelligence
Intelligent system
Intelligent agent
International Joint Conference on Artificial Intelligence
Loebner prize

Nanotechnology
Neuromancer
Nouvelle AI
PEAS
Personhood
Predictive analytics
Robot
Singularitarianism
Three Laws of Robotics
Transhuman

Notes References