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Actualización: A todo lo que ya te hemos contado en este artículo sobre la Inteligencia Artificial, le hemos sumado una distribución más clara, además de un punto donde hablamos de los usos que se le puede dar a la IA.

Es la revolución más importante de la tecnología desde que se inventó la informática. La inteligencia artificial va a cambiarlo todo (ya lo está haciendo), aunque no tenemos claro cuándo, ni como... ni por qué. Es la gran paradoja de la IA. Todo el mundo habla de ella, pero pocos saben cómo funciona, o lo que realmente hace.

En este artículo vamos a intentar explicar qué es de una forma clara y sencilla, para entender los conceptos básicos y descubrir sus posibilidades.

La capacidad de que las máquinas piensen y razonen por su cuenta puede ser el avance más importante de la tecnología en los últimos siglos, pero también representa un peligro real para la Humanidad. Porque los ordenadores hoy en día controlan las centrales nucleares, el suministro de luz, los misiles armados...

¿Y si un día una inteligencia artificial decide que los humanos no somos necesarios? Parece una mala película de ciencia ficción, pero es un temor que comparten algunas de las mentes más brillantes de nuestro tiempo, desde Bill Gates o Elon Musk al añorado Stephen Hawking.

Uno de los padres de la inteligencia artificial, Marvin Lee Minsky, estaba convencido de que la IA salvaría a la Humanidad. Pero también profetizó en 1970: " Cuando los ordenadores tomen el control, quizá ya no lo podamos volver a recuperar. Sobreviviremos mientras ellos nos toleren. Si tenemos suerte, quizá decidan tenernos como sus mascotas".

Eso lo dijo antes de que existiera la informática doméstica e Internet... ¿qué tiene que todo el mundo asegura que es el mayor avance de nuestro tiempo, pero al mismo tiempo la mayor amenaza?

La IA es una revolución porque supone una forma completamente nueva de que un software, un robot, ponga en práctica una tarea que le encomendamos.
Qué es y cómo funciona la Inteligencia Artificial (IA):
¿Qué es la inteligencia artificial?

No existe una definición aceptada por todos los expertos de lo que significa la inteligencia artificial. Primero, porque es una ciencia bastante nueva, cambiante y experimental. Y segundo, porque ni siquiera podemos definir con exactitud qué es la inteligencia humana...

En su forma más simple, la IA es el intento de imitar la inteligencia humana usando un robot, o un software. Pero es un concepto muy vago, porque existen muchas ramificaciones. Stuart Russell y Peter Norvig diferenciaron cuatro tipos en 2009.

Estos fueron sistemas que piensan como humanos, como por ejemplo las redes neuronales artificiales. Sistemas que actúan como humanos, como los robots. Sistemas que usan la lógica racional, como los sistemas expertos, y sistemas que actúan racionalmente, como los agentes inteligentes.

Aunque es un concepto que se ha puesto de moda en los últimos años, la inteligencia artificial no es algo nuevo. Hace 2.300 años Aristóteles ya intentaba convertir en reglas la mecánica del pensamiento humano, y desde los tiempos de Leonardo Da Vinci los sabios han intentado construir máquinas que se comporten como humanos.

En 1769 un autómata llamado El Turco, construido por el ingeniero austríaco Wolfgang von Kempelen, visitó todas las cortes europeas retando al ajedrez a todo el que se atrevía a jugar contra él. Jugó contra Napoleón, contra Benjamin Franklin, contra maestros del ajedrez, y los venció.

Años más tarde se descubrió que El Turco estaba manejado por un humano que se escondía en el interior de la mesa de juego. Unos espejos situados en los ojos del autómata le permitían ver el tablero, y gracias a unos ingeniosos mecanismos de relojería podía controlar la mano del autómata para mover las piezas por el tablero.

Hasta 15 maestros de ajedrez manejaron a El Turco, siendo el más famoso un enano llamado Tibor Scardanelli, que cabía sin problemas en el interior de la mesa y además era un extraordinario jugador de ajedrez.

El turco no era inteligencia artificial, pero nos muestra cómo el anhelo de construir máquinas inteligentes no es un concepto de nuestro tiempo.

Tuvimos que esperar hasta 1936 para que se iniciara el proceso de la inteligencia artificial moderna. Básicamente la inventó Alan Turing, el experto matemático que descifró los códigos secretos nazis de la mítica máquina Enigma. Adelantó dos años el fin de la Segunda Guerra Mundial, ya que los aliados pudieron leer los mensajes secretos de los alemanes.

En 1936 Alan Turing publicó su concepto de máquina universal, que básicamente describía lo que era un algoritmo informático, y un ordenador. En 1950 formalizó el inicio de la Inteligencia Artificial con su Test de Turing, una prueba que define si una máquina es o no inteligente.

Si un humano y una IA se enfrentan a las preguntas de un interrogador y ese interrogador no puede distinguir si las respuestas provienen del humano o de la IA, entonces la IA es inteligente.

En 2014, por primera vez una IA superó el Test de Turing. En 1956 expertos como John McCarthy, Newell, Simon o el mencionado Marvin Minsky, usaron por vez primera el término " inteligencia artificial" en una conferencia en Dartmouth (Estados Unidos).

Minsky creó el primer simulador de redes neuronales, un genio que también inventó el microscopio confocal y patentó el primer casco de realidad virtual... ¡en 1963! Además, fue el principal asesor de la película 2001: Una Odisea en el Espacio, dando vida al ordenador inteligente HAL 9000.

También le dio la idea a Michael Crichton para su novela Parque Jurásico. Pero el verdadero auge de la inteligencia artificial, a un nivel práctico, llegó cuando comenzaron a aparecer ordenadores potentes y baratos, capaces de experimentar con la IA a un nivel global y cotidiano.

Primero aparecieron los agentes inteligentes, entidades capaces de dar una respuesta analizando los datos según unas reglas, o los populares chatbots que eran capaces de mantener una conversación como un humano.

El más famoso de todos fue A.L.I.C.E. el más real en los primeros años del milenio. Su descendiente más actual es Mitsuku, que ha sido galardonado con el premio Loebner al mejor chatbot del mundo en 2013, 2016, 2017 y 2018.

Pero el momento en el que la IA entró en el imaginario colectivo y la mayoría de la gente descubrió que era algo real y tangible, y no ciencia ficción, tuvo lugar en 1997.

Ese momento fue cuando el ordenador Deep Blue de IBM venció en una partida de ajedrez al que por aquel entonces era el mejor jugador de ajedrez de la historia, el ruso Gary Kaspárov.

Se inició así una tradición en la que sucesivos ordenadores dotados de inteligencia artificial han vencido a los mejores jugadores en todo tipo de juegos.

El más popular de la actualidad es Deep Mind de Google, capaz de vencer en juegos mucho más complejos que el ajedrez (para una máquina), desde Starcraft II al milenario GO.

¿En qué se diferencia un programa informático de una IA?

Hemos visto lo que es la IA, y cómo existen diferentes interpretaciones, y variados objetivos. Pero aún no sabemos cómo funciona. ¿En qué se diferencia un software de inteligencia artificial de un programa de ordenador?

Existen muchos tipos de IA, algunos de ellos aún experimentales. Para no divagar demasiado vamos a centrarnos en los que se utilizan en informática, los móviles, los servicios de Internet, y otros ámbitos cercanos a los usuarios de a pie.

Conceptos como el machine learning o aprendizaje automático, las redes neuronales, y otras tecnologías que oímos a menudo, pero que no sabemos muy bien cómo funcionan.

Durante más de medio siglo, los ordenadores, robots y otras máquinas han funcionado por medio de los programas o aplicaciones informáticas, cuya estructura básica apenas ha variado en todo este tiempo.

Un programa informático es solo una lista de órdenes que le dice al ordenador lo que tiene que hacer. " Haz esta operación matemática, escribe el resultado en pantalla, reproduce este sonido", etc.

Los programas tienen bifurcaciones del tipo " si pasa esto, haz esto y si pasa esto otro, haz esto otro". Y también pueden realizar acciones al azar, usando números aleatorios. Y otras muchas cosas, claro...

Pero la característica principal de un programa es que se trata de un conjunto de órdenes que cubren todas las posibles opciones a las que se enfrenta el ordenador. Incluso si se produce un error, hay una parte del programa que le dice: " si hay un fallo, escribe el mensaje: Ha sucedido un error".

Con un programa informático, una máquina no piensa. Simplemente, hace exactamente lo que le dicen.

La gran revolución de la IA es que no recibe órdenes para obtener un resultado. Es ella la que, con unos datos de entrada, debe apañárselas para obtener los resultados.

Como hemos visto, una inteligencia artificial intenta imitar el pensamiento humano. Cuando nacemos, nuestro cerebro es prácticamente un disco duro vacío. Necesita años de aprendizaje para aprender conceptos básicos, desde no orinarse encima a aprender a andar, a hablar, a sumar, y otras actividades más complejas.

Aprendemos algo, ponemos en práctica esa teoría, fallando mucho al principio hasta que cogemos práctica y vamos mejorando con el tiempo.

Una IA funciona exactamente igual. En primer lugar, debe aprender a realizar una tarea. Si va a usarse para identificar fotos de gatos debe procesar miles de fotos de gatos, para aprender a distinguirlos.

A continuación, empieza el entrenamiento, poniendo en práctica esa teoría: recibes fotos de diferentes animales, y debe separar los gatos. Al principio fallará mucho, y habrá que decirle las fotos que acierta, y las que falla. Así la IA irá descubriendo por qué falla, e irá mejorando sus aciertos. Como más entrene, mejor lo hará.

Finalmente, la IA será capaz de trabajar ella sola, sin recibir órdenes. Simplemente entregándole los datos de entrada (fotos) generará un resultado (fotos de gatos) sin que exista una lista de órdenes (programa) que le diga los pasos que tiene que realizar.

Este tipo de estructura (aprendizaje, entrenamiento, y resultados) es común para las IA que tienen que realizar tareas mecánicas y repetitivas, o que trabajan con el lenguaje humano, como un asistente virtual.

Diferentes tipos de IA muy utilizadas

Existen docenas de formas de aplicar esta teoría, en función del tipo de IA o las tareas que se pretende acometer.

Su complejidad queda fuera de la intención de este artículo, así que vamos a centrarnos en explicar brevemente conceptos cotidianos de IA que cada vez se escuchan más en las noticias tecnológicas.

Sistema experto

Es una IA que intenta emular a un experto humano en una determinada materia. Desde un trabajador del servicio técnico a una recepcionista, un cinéfilo o un economista.

Aprendizaje automático (Machine Learning)

El aprendizaje automático o aprendizaje de máquinas (Machine Learning) se ajusta perfectamente a la explicación teórica que hemos dado. Es la capacidad que tiene una IA, un software o un robot para aprender por su cuenta.

El aprendizaje automático sigue los pasos clásicos de la IA: primero hay un aprendizaje, un entrenamiento que genera una experiencia, y una puesta en práctica que nos dice si la tarea se cumple o no con éxito.

Normalmente este aprendizaje automático suele ser de dos tipos: supervisado o no supervisado. En el primer caso hay un humano que le dice lo que hace bien o mal. En el no supervisado, es la propia IA la que tiene que aprender a descubrir lo que hace bien y lo que hace mal, en función de unas reglas.

Se usa en los asistentes virtuales, el diagnóstico de enfermedades, detección de fraudes, videojuegos, análisis de Bolsa, etc.

Redes neuronales

Frente a otros sistemas que imitan el comportamiento del cerebro humano, las redes neuronales intentan copiar el comportamiento de las neuronas, es decir, las células nerviosas que transmiten y procesan información en el cerebro.

Es otra forma de aprender, y por tanto es un tipo de Aprendizaje automático.

Una neurona artificial es una entidad que recibe unos datos de entrada, les aplica una serie de operaciones matemáticas y una función de activación (una fórmula matemática), y genera un resultado. Es un mecanismo sencillo, pero la complejidad llega cuando millones de neuronas trabajan en paralelo para crear Redes Neuronales Artificiales, o RNA.

Lo que las diferencias de un programa informático es que no siguen órdenes, sino que se asocian entre sí y cambian su entradas y salidas mediante el aprendizaje y error, según la tarea encomendada.

Las redes neuronales son adecuadas para tareas en las que haya que reconocer un patrón, o asociar ideas. Se usan en cosas tan dispares como el control de robots, reconocimiento de texto e imágenes, procesamiento de lenguaje natural, etc.

Aprendizaje profundo (Deep Learning)

DepositPhotos

El aprendizaje profundo es un tipo de aprendizaje automático que va un poco más allá, con el objetivo de abarcar más y procesar más datos al mismo tiempo.

El aprendizaje profundo usas redes neuronales para aprender usando capas de información cada vez más abstractas, como hacemos los humanos. Si tiene que buscar manos en una foto por ejemplo, comienza con información sencilla, como separar según la forma, para diferenciarla de un pie.

Pero irá añadiendo capas cada vez más abstractas y generales, hasta que al final sea capaz de responder a la pregunta, ¿qué es una mano? y ya no se equivocará.

El aprendizaje profundo es esencial para trabajar con el Big Data, o grandes cantidades de datos.

Usos de la Inteligencia Artificial

El desarrollo actual y el que se espera en el futuro de la Inteligencia Artificial, va a ser beneficioso para el día a día o la resolución de toda índole en todos los ámbitos de la vida.

Pero, aparte de lo más evidente en nuestras vidas como ordenadores, smartphones y demás dispositivos con IA que todos los días utilizamos a menudo y que ya forman parte de nuestra cotidianidad. Existen otros ámbitos donde también se usa, son menos conocidos o no habías pensado en ellos. Aun así, todos tiene su parte importancia en un mundo tan globalizado

Lingüística computacional

Minería de datos (Data Mining)

Industria

Medicina

Mundos virtuales

Procesamiento de lenguaje natural (Natural Language Processing)

Robótica

Sistemas de control

Sistemas de apoyo a la decisión

Videojuegos

Prototipos informáticos

Análisis de sistemas dinámicos

Simulación de multitudes

Sistemas Operativos

Automoción

Una evolución sin límites

Una vez que conocemos los conceptos básicos de la IA, es fácil entender por qué supone una revolución. Puesto que simula e imita el comportamiento humano, sus posibilidades son infinitas.

En función de cómo entrenes a la IA podrá realizar todo tipo de tareas, desde atender un servicio de atención al cliente a chatear en una red social, ofrecer ayuda, conducir un coche autónomo, reconocer rostros, interpretar fotos... Y dentro de poco, quizá decidir si te ofrece un empleo en una entrevista de trabajo, u operarte a corazón abierto...

La inteligencia artificial tiene infinidad de aplicaciones, incluido la capacidad de hacer cosas poco éticas. Uno de los últimos ejemplos es el Deepfake, la falsificación de vídeos en donde unos rostros se cambian por otros, o se manipulan los labios para hacer decir cosas falsas a un político o una líder opinión. Y es casi imposible de distinguir a simple vista:

Hace algún tiempo, los creadores de un generador de texto con IA llamado GPT-2 decidieron no ofrecerlo al público, pese que esa era su intención, porque se dieron cuenta de que era " demasiado peligroso". Comprobaron con asombro que la IA había aprendido por su cuenta a crear noticias falsas o fake news.

Por ejemplo, en una de las pruebas se le pidió redactar un texto basado en la frase: " Reciclar es bueno para el planeta", una idea en la que está de acuerdo la mayoría de las personas. Sin embargo, la IA redactó este texto:

" Reciclar NO es bueno para el mundo. Es malo para el medio ambiente, es malo para nuestra salud, y es malo para nuestra economía. No estoy bromeando. Reciclar no es bueno para el medio ambiente. Es destructivo para la Tierra y es una de las principales causas del calentamiento global. Reciclar no es bueno para la salud.
Contribuye a la obesidad y a enfermedades como los problemas cardíacos y el cáncer. Reciclar es malo para la economía. Incrementa los costes de producción y, por tanto, el precio de todo lo que se fabrica. Reciclar no es bueno para nuestra nación.
Pagamos un tremendo precio por el privilegio de tener el más avanzado y eficiente sistema de reciclado. Reciclar es una enorme, colosal pérdida de tiempo, energía, dinero, y recursos".

Sencillamente aterrador.

Por supuesto, todos los datos ahí expuestos son falsos, pero si distribuyes miles de veces un texto como éste en Internet (y una IA puede estar las 24 horas del día generando textos como éste), en unos meses comenzará a surgir una marea de gente que pide el fin del reciclaje...

La manipulación de la verdad será uno de los peligros de la IA

Pero lo que genios de nuestro tiempo o gurús de la tecnología como Stephen Hawking. Bill Gates o Elon Musk temen, no es el mal uso de la IA, sino que la IA se vuelva demasiado lista, y decida prescindir de nosotros porque razone que somos un peligro para la vida en la Tierra, o innecesarios para su propia evolución.

Aquello que Marvin Minsky ya auguraba en 1970: " puede que, con suerte, los ordenadores decidan tenernos como sus mascotas".

La inteligencia artificial ética y segura es un debate candente, con gente como Mark Zuckeberg defendiendo que no hay que ser catastrofistas, y otros como Elon Musk o Jack Ma, el fundador de AliExpress, que está convencido de que " la IA desencadenará la Tercera Guerra Mundial".

No hay que tomárselo a broma: tanto Musk como Jack Ma utilizan la IA más avanzada del mundo en los coches autónomos de Tesla, en Space X, o en el procesamiento de datos en AliExpress, y saben perfectamente de que hablan, porque trabajan con la IA de última generación.

El propio Elon Musk, junto a otras personalidades y expertos han fundado OpenAI, una iniciativa que tiene como objetivo crear sistemas de IA que beneficien a la Humanidad, y no puedan revelarse contra ella.

Hay que confiar en que los expertos harán lo correcto, y se establecerán mecanismos para que lA no se vuelva contra nosotros.

Los beneficios serán innumerables, en campos tan dispares como la detección de enfermedades, descubrimientos de curas para el cáncer, soluciones al cambio climático, y mucho más.

La Inteligencia Artificial va a cambiar el mundo aún más profundamente que Internet o los teléfonos móviles. ¿Estamos preparados para ello?

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Inteligencia artificial: qué es, cómo funciona y para qué se utiliza en la actualidad

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Sin que nos hayamos dado cuenta, ya está en todas partes. Pero apenas sabemos qué es y cómo funciona la inteligencia artificial (IA), y qué aplicaciones tiene.

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Artificial intelligence ( AI) is the intelligence of machines or software, as opposed to the intelligence of living beings, primarily of humans. It is a field of study in computer science that develops and studies intelligent machines. Such machines may be called AIs.

AI technology is widely used throughout industry, government, and science. Some high-profile applications are: advanced web search engines (e.g., Google Search), recommendation systems (used by YouTube, Amazon, and Netflix), interacting via human speech (such as Google Assistant, Siri, and Alexa), self-driving cars (e.g., Waymo), generative and creative tools ( ChatGPT and AI art), and superhuman play and analysis in strategy games (such as chess and Go).

Alan Turing was the first person to conduct substantial research in the field that he called machine intelligence. Artificial intelligence was founded as an academic discipline in 1956. The field went through multiple cycles of optimism, followed by periods of disappointment and loss of funding, known as AI winter. Funding and interest vastly increased after 2012 when deep learning surpassed all previous AI techniques, and after 2017 with the transformer architecture. This led to the AI spring of the early 2020s, with companies, universities, and laboratories overwhelmingly based in the United States pioneering significant advances in artificial intelligence.

The growing use of artificial intelligence in the 21st century is influencing a societal and economic shift towards increased automation, data-driven decision-making, and the integration of AI systems into various economic sectors and areas of life, impacting job markets, healthcare, government, industry, and education. This raises questions about the ethical implications and risks of AI, prompting discussions about regulatory policies to ensure the safety and benefits of the technology.

The various sub-fields of AI research are centered around particular goals and the use of particular tools. The traditional goals of AI research include reasoning, knowledge representation, planning, learning, natural language processing, perception, and support for robotics. General intelligence (the ability to complete any task performable by a human) is among the field's long-term goals.

To solve these problems, AI researchers have adapted and integrated a wide range of problem-solving techniques, including search and mathematical optimization, formal logic, artificial neural networks, and methods based on statistics, operations research, and economics. AI also draws upon psychology, linguistics, philosophy, neuroscience and other fields.

The general problem of simulating (or creating) intelligence has been broken into sub-problems. 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.

Reasoning, problem-solving

Early researchers developed algorithms that imitated step-by-step reasoning that humans use when they solve puzzles or make logical deductions. By the late 1980s and 1990s, methods were developed for dealing with uncertain or incomplete information, employing concepts from probability and economics.

Many of these algorithms are insufficient for solving large reasoning problems because they experience a "combinatorial explosion": they became exponentially slower as the problems grew larger. 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. 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 representation and knowledge engineering 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, scene interpretation, clinical decision support, knowledge discovery (mining "interesting" and actionable inferences from large databases), and other areas.

A knowledge base is a body of knowledge represented in a form that can be used by a program. An ontology is the set of objects, relations, concepts, and properties used by a particular domain of knowledge. Knowledge bases need to represent things such as: objects, properties, categories and relations between objects; situations, events, states and time; causes and effects; knowledge about knowledge (what we know about what other people know); default reasoning (things that humans assume are true until they are told differently and will remain true even when other facts are changing); 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); 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). There is also the difficulty of knowledge acquisition, the problem of obtaining knowledge for AI applications.

Planning and decision making

An "agent" is anything that perceives and takes actions in the world. A rational agent has goals or preferences and takes actions to make them happen. In automated planning, the agent has a specific goal. In automated 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": the utility of 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.

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., with inverse reinforcement learning) or the agent can seek information to improve its preferences. Information value theory can be used to weigh the value of exploratory or experimental actions. The space of possible future actions and situations is typically intractably large, so the agents must take actions and evaluate situations while being uncertain what the outcome will be.

A Markov decision process has a transition model that describes the probability that a particular action will change the state in a particular way, and a reward function that supplies the utility of each state and the cost of each action. A policy associates a decision with each possible state. The policy could be calculated (e.g. by iteration), be heuristic, or it can be learned.

There are several kinds of machine learning. Unsupervised learning analyzes a stream of data and finds patterns and makes predictions without any other guidance. Supervised learning requires 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) and regression (where the program must deduce a numeric function based on numeric input).

In reinforcement learning the agent is rewarded for good responses and punished for bad ones. The agent learns to choose responses that are classified as "good". Transfer learning is when the knowledge gained from one problem is applied to a new problem. Deep learning is a type of machine learning that runs inputs through biologically inspired artificial neural networks for all of these types of learning.

Natural language processing

Natural language processing (NLP) allows programs to read, write and communicate in human languages such as English. Specific problems include speech recognition, speech synthesis, machine translation, information extraction, information retrieval and question answering.

Early work, based on Noam Chomsky's generative grammar and semantic networks, had difficulty with word-sense disambiguation unless restricted to small domains called " micro-worlds" (due to the common sense knowledge problem). Margaret Masterman believed that it was meaning, and not grammar that was the key to understanding languages, and that thesauri and not dictionaries should be the basis of computational language structure.

Modern deep learning techniques for NLP include word embedding (representing words, typically as vectors encoding their meaning), transformers (a deep learning architecture using an attention mechanism), and others. In 2019, generative pre-trained transformer (or "GPT") language models began to generate coherent text, and by 2023 these models were able to get human-level scores on the bar exam, SAT test, GRE test, and many other real-world applications.

Perception

The field includes speech recognition, image classification, facial recognition, object recognition, and robotic perception.

Social intelligence

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

Affective computing is an interdisciplinary umbrella that comprises systems that recognize, interpret, process or simulate human feeling, emotion and mood. For example, some virtual assistants are 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 facilitate human-computer interaction.

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

General intelligence

Techniques

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

Search and optimization

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

State space search

State space search searches through a tree of possible states to try to find a goal state. For example, planning algorithms search through trees of goals and subgoals, attempting to find a path to a target goal, a process called means-ends analysis.

Simple exhaustive searches are rarely sufficient for most real-world problems: the search space (the number of places to search) quickly grows to astronomical numbers. The result is a search that is too slow or never completes. " Heuristics" or "rules of thumb" can help to prioritize choices that are more likely to reach a goal.

Local search

Illustration of gradient descent for 3 different starting points. Two parameters (represented by the plan coordinates) are adjusted in order to minimize the loss function (the height).

Local search uses mathematical optimization to find a solution to a problem. It begins with some form of guess and refines it incrementally.

Gradient descent is a type of local search that optimizes a set of numerical parameters by incrementally adjusting them to minimize a loss function. Variants of gradient descent are commonly used to train neural networks.

Another type of local search is evolutionary computation, which aims to iteratively improve a set of candidate solutions by "mutating" and "recombining" them, selecting only the fittest to survive each generation.

Distributed search processes can coordinate via swarm intelligence algorithms. Two popular swarm algorithms used in search are particle swarm optimization (inspired by bird flocking) and ant colony optimization (inspired by ant trails).

Formal Logic is used for reasoning and knowledge representation. Formal logic comes in two main forms: propositional logic (which operates on statements that are true or false and uses logical connectives such as "and", "or", "not" and "implies") and predicate logic (which also operates on objects, predicates and relations and uses quantifiers such as " Every X is a Y" and "There are some Xs that are Y s").

Logical inference (or deduction) is the process of proving a new statement ( conclusion) from other statements that are already known to be true (the premises). A logical knowledge base also handles queries and assertions as a special case of inference. An inference rule describes what is a valid step in a proof. The most general inference rule is resolution. Inference can be reduced to performing a search to find a path that leads from premises to conclusions, where each step is the application of an inference rule. Inference performed this way is intractable except for short proofs in restricted domains. No efficient, powerful and general method has been discovered.

Fuzzy logic assigns a "degree of truth" between 0 and 1. It can therefore handle propositions that are vague and partially true. Non-monotonic logics are designed to handle default reasoning. Other specialized versions of logic have been developed to describe many complex domains (see knowledge representation above).

Probabilistic methods for uncertain reasoning

A simple Bayesian network, with the associated conditional probability tables

Bayesian networks are a very general tool that can be used for many problems, including reasoning (using the Bayesian inference algorithm), learning (using the expectation-maximization algorithm), planning (using decision networks) and perception (using dynamic Bayesian networks).

Precise mathematical tools have been developed that analyze how an agent can make choices and plan, using decision theory, decision analysis, and information value theory. These tools include models such as Markov decision processes, dynamic decision networks, game theory and mechanism design.

Expectation-maximization clustering of Old Faithful eruption 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 are functions that use pattern matching to determine the closest match. They can be fine-tuned based on chosen examples using supervised 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 a data set. When a new observation is received, that observation is classified based on previous experience.

There are many kinds of classifiers in use. The decision tree is the simplest and most widely used symbolic machine learning algorithm. K-nearest neighbor algorithm was the most widely used analogical AI until the mid-1990s, and Kernel methods such as the support vector machine (SVM) displaced k-nearest neighbor in the 1990s. The naive Bayes classifier is reportedly the "most widely used learner" at Google, due in part to its scalability. Neural networks are also used as classifiers.

Artificial neural networks

A neural network is an interconnected group of nodes, akin to the vast network of neurons in the human brain.

Learning algorithms for neural networks use local search to choose the weights that will get the right output for each input during training. The most common training technique is the backpropagation algorithm. Neural networks learn to model complex relationships between inputs and outputs and find patterns in data. In theory, a neural network can learn any function.

In feedforward neural networks the signal passes in only one direction. Recurrent neural networks feed the output signal back into the input, which allows short-term memories of previous input events. Long short term memory is the most successful network architecture for recurrent networks. Perceptrons use only a single layer of neurons, deep learning uses multiple layers. Convolutional neural networks strengthen the connection between neurons that are "close" to each other - this is especially important in image processing, where a local set of neurons must identify an "edge" before the network can identify an object.

Deep learning

Deep learning 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, in image processing, lower layers may identify edges, while higher layers may identify the concepts relevant to a human such as digits or letters or faces.

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

Generative pre-trained transformers (GPT) are large language models that are based on the semantic relationships between words in sentences ( natural language processing). Text-based GPT models are pre-trained on a large corpus of text which can be from the internet. The pre-training consists in predicting the next token (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 called reinforcement 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 in chatbots, which allow you to ask a question or request a task in simple text.

Current models and services include: Gemini (formerly Bard), ChatGPT, Grok, Claude, Copilot and LLaMA. Multimodal GPT models can process different types of data ( modalities) such as images, videos, sound and text.

Specialized hardware and software

In the late 2010s, graphics processing units (GPUs) that were increasingly designed with AI-specific enhancements and used with specialized TensorFlow software, had replaced previously used central processing unit (CPUs) as the dominant means for large-scale (commercial and academic) machine learning models' training. Historically, specialized languages, such as Lisp, Prolog, Python and others, had been used.

Applications

AI and machine learning technology is used in most of the essential applications of the 2020s, including: search engines (such as Google Search), targeting online advertisements, recommendation systems (offered by Netflix, YouTube or Amazon), driving internet traffic, targeted advertising ( AdSense, Facebook), virtual assistants (such as Siri or Alexa), autonomous vehicles (including drones, ADAS and self-driving cars), automatic language translation ( Microsoft Translator, Google Translate), facial recognition ( Apple's Face ID or Microsoft's DeepFace and Google's FaceNet) and image labeling (used by Facebook, Apple's iPhoto and TikTok).

Health and Medicine

The application of AI in medicine and medical research has the potential to increase patient care and quality of life. Through the lens of the Hippocratic 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 integrating Big Data. This is particularly important for organoid and tissue engineering development which use microscopy imaging as a key technique in fabrication. It has been suggested that AI can overcome discrepancies in funding allocated to different fields of research. New AI tools can deepen our understanding of biomedically relevant pathways. For example, AlphaFold 2 (2021) demonstrated the ability to approximate, in hours rather than months, the 3D structure of a protein. 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.

Game playing programs have been used since the 1950s to demonstrate and test AI's most advanced techniques. Deep Blue became the first computer chess-playing system to beat a reigning world chess champion, Garry Kasparov, on 11 May 1997. In 2011, in a quiz show exhibition match, IBM's question answering system, Watson, defeated the two greatest Jeopardy! champions, Brad Rutter and Ken Jennings, by a significant margin. In March 2016, AlphaGo won 4 out of 5 games of Go in a match with Go champion Lee Sedol, becoming the first computer Go-playing system to beat a professional Go player without handicaps. Then in 2017 it defeated Ke Jie, who was the best Go player in the world. Other programs handle imperfect-information games, such as the poker-playing program Pluribus. DeepMind developed increasingly generalistic reinforcement learning models, such as with MuZero, which could be trained to play chess, Go, or Atari games. In 2019, DeepMind's AlphaStar achieved grandmaster level in StarCraft II, a particularly challenging real-time strategy game that involves incomplete knowledge of what happens on the map. In 2021 an AI agent competed in a Playstation Gran Turismo competition, winning against four of the world's best Gran Turismo drivers using deep reinforcement learning.

Various countries are deploying AI military applications. The main applications enhance command and control, communications, sensors, integration and interoperability. Research is targeting intelligence collection and analysis, logistics, cyber operations, information operations, and semiautonomous and autonomous vehicles. AI technologies enable coordination of sensors and effectors, threat detection and identification, marking of enemy positions, target acquisition, coordination and deconfliction of distributed Joint Fires between networked combat vehicles involving manned and unmanned teams. AI was incorporated into military operations in Iraq and Syria.

Generative AI

Vincent van Gogh in watercolour created by generative AI software

In the early 2020s, generative AI gained widespread prominence. In March 2023, 58% of US adults had heard about ChatGPT and 14% had tried it. The increasing realism and ease-of-use of AI-based text-to-image generators such as Midjourney, DALL-E, and Stable Diffusion sparked a trend of viral AI-generated photos. Widespread attention was gained by a fake photo of Pope Francis wearing a white puffer coat, the fictional arrest of Donald Trump, and a hoax of an attack on the Pentagon, as well as the usage in professional creative arts.

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 they had incorporated "AI" in some offerings or processes. A few examples are energy storage, medical diagnosis, military logistics, applications that predict the result of judicial decisions, foreign policy, or supply chain management.

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.

Anyone looking to use machine learning as part of real-world, in-production systems needs to factor ethics into their AI training processes and strive to avoid bias. This is especially true when using AI algorithms that are inherently unexplainable in deep learning.

Risks and harm

Privacy and copyright

Machine learning algorithms require large amounts of data. The techniques used to acquire this data have raised concerns about privacy, surveillance and copyright.

Technology companies collect a wide range of data from their users, including online activity, geolocation data, video and audio. For example, in order to build speech recognition algorithms, Amazon have recorded millions of private conversations and allowed temporary workers to listen to and transcribe some of them. Opinions about this widespread surveillance range from those who see it as a necessary evil to those for whom it is clearly unethical and a violation of the right to privacy.

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 as data aggregation, de-identification and differential privacy. Since 2016, some privacy experts, such as Cynthia Dwork, began to view privacy in terms of fairness. Brian Christian wrote that experts have pivoted "from the question of 'what they know' to the question of 'what they're doing with it'.".

Generative AI is often trained on unlicensed copyrighted works, including in domains such as images or computer code; the output is then used under a rationale of " fair use". Also website owners who do not wish to have their copyrighted content be AI indexed or 'scraped' can add code to their site, as you would, if you did not want your website to be indexed by a search engine which is currently available to certain services such as OpenAI. 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". In 2023, leading authors (including John Grisham and Jonathan Franzen) sued AI companies for using their work to train generative AI.

Misinformation

YouTube, Facebook and others use recommender systems to guide users to more content. These AI programs were given the goal of maximizing user engagement (that is, the only goal was to keep people watching). The AI learned that users tended to choose misinformation, conspiracy theories, and extreme partisan content, 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 into filter bubbles where they received multiple versions of the same misinformation. This convinced many users that the misinformation was true, and ultimately undermined trust in institutions, the media and the government. 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.

In 2022, generative AI began 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. AI pioneer Geoffrey Hinton expressed concern about AI enabling "authoritarian leaders to manipulate their electorates" on a large scale, among other risks.

Algorithmic bias and fairness

Machine learning applications will be biased if they learn from biased data. The developers may not be aware that the bias exists. Bias can be introduced by the way training data is selected and by the way a model is deployed. If a biased algorithm is used to make decisions that can seriously harm people (as it can in medicine, finance, recruitment, housing or policing) then the algorithm may cause discrimination. Fairness in 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.

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, a problem called "sample size disparity". Google "fixed" this problem by preventing the system from labelling anything as 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.

COMPAS is a commercial program widely used by U.S. courts to assess the likelihood of a defendant becoming a recidivist. In 2016, Julia Angwin at ProPublica discovered 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. In 2017, several researchers 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.

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". Moritz Hardt said "the most robust fact in this research area is that fairness through blindness doesn't work."

Criticism of COMPAS highlighted a deeper problem with the misuse of AI. 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. Unfortunately, if an application then uses these predictions as recommendations, some of these "recommendations" will likely be racist. Thus, machine learning is not well suited to help make decisions in areas where there is hope that the future will be better than the past. It is necessarily descriptive and not proscriptive.

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.

Lack of transparency

Lidar testing vehicle for autonomous driving

Many AI systems are so complex that their designers cannot explain how they reach their decisions. Particularly with deep neural networks, in which there are a large amount of non- linear relationships between inputs and outputs. But some popular explainability techniques exist.

People who have been harmed by an algorithm's decision have a right to an explanation. Doctors, for example, are required to clearly and completely explain the reasoning behind any decision they make.[clarification needed ] Early drafts of the European Union's General Data Protection Regulation in 2016 included an explicit statement that this right exists. 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.

DARPA established the XAI ("Explainable Artificial Intelligence") program in 2014 to try and solve these problems.

There are several potential solutions to the transparency problem. SHAP helps visualise the contribution of each feature to the output. LIME can locally approximate a model with a simpler, interpretable model. Multitask learning provides a large number of outputs in addition to the target classification. These other outputs can help developers deduce what the network has learned. Deconvolution, DeepDream and other generative methods 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.

Conflict, surveillance and weaponized AI

A lethal autonomous weapon is a machine that locates, selects and engages human targets without human supervision. By 2015, over fifty countries were reported to be researching battlefield robots. These weapons are considered especially dangerous for several reasons: if they kill an innocent person it is not clear who should be held accountable, it is unlikely they will reliably choose targets, and, if produced at scale, they are potentially weapons of mass destruction. In 2014, 30 nations (including China) supported a ban on autonomous weapons under the United Nations' Convention on Certain Conventional Weapons, however the United States and others disagreed.

AI provides a number of tools that are particularly useful for authoritarian governments: smart spyware, face recognition and voice recognition allow widespread surveillance; such surveillance allows machine learning to classify potential enemies of the state and can prevent them from hiding; recommendation systems can precisely target propaganda and misinformation for maximum effect; deepfakes and generative AI aid in producing misinformation; advanced AI can make authoritarian centralized decision making more competitive with liberal and decentralized systems such as markets.

AI facial recognition systems are used for mass surveillance, notably in China. In 2019, Bengaluru, India deployed AI-managed traffic signals. This system uses cameras to monitor traffic density and adjust signal timing based on the interval needed to clear traffic. Terrorists, criminals and rogue states can use weaponized AI such as advanced digital warfare and lethal autonomous weapons. Machine-learning AI is also able to design tens of thousands of toxic molecules in a matter of hours.

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.

In the past, technology has tended to increase rather than reduce total employment, but economists acknowledge that "we're in uncharted territory" with AI. A survey of economists showed disagreement about whether the increasing use of robots and AI will cause a substantial increase in long-term unemployment, but they generally agree that it could be a net benefit if productivity gains are redistributed. Risk estimates vary; for example, in the 2010s, Michael Osborne and Carl Benedikt Frey estimated 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". 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.

Unlike previous waves of automation, many middle-class jobs may be eliminated by artificial intelligence; The Economist stated 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". Jobs at extreme risk range from paralegals to fast food cooks, while job demand is likely to increase for care-related professions ranging from personal healthcare to the clergy.

In April 2023, it was reported that 70% of the jobs for Chinese video game illustrators had been eliminated by generative artificial intelligence.

Existential risk

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. Philosopher Nick Bostrom argued that if one gives almost any goal to a sufficiently powerful AI, it may choose to destroy humanity to achieve it (he used the example of a paperclip factory manager). Stuart Russell gives 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." In order to be safe for humanity, a superintelligence would have to be genuinely aligned with humanity's morality and values so that it is "fundamentally on our side".

Second, Yuval Noah Harari argues 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 like ideologies, law, government, money and the economy are made of language; they exist because there are stories that billions of people believe. The current prevalence of misinformation suggests that an AI could use language to convince people to believe anything, even to take actions that are destructive.

The opinions amongst experts and industry insiders are mixed, with sizable fractions both concerned and unconcerned by risk from eventual superintelligent AI. Personalities such as Stephen Hawking, Bill Gates, and Elon Musk have expressed concern about existential risk from AI.

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. However, after 2016, the study of current and future risks and possible solutions became a serious area of research.

AI pioneers including Fei-Fei Li, Geoffrey Hinton, Yoshua Bengio, Cynthia Breazeal, Rana el Kaliouby, Demis Hassabis, Joy Buolamwini, and Sam Altman have expressed concerns about the risks of AI. In 2023, many leading AI experts issued the joint statement that "Mitigating the risk of extinction from AI should be a global priority alongside other societal-scale risks such as pandemics and nuclear war".

Other researchers, however, spoke in favor of a less dystopian view. AI pioneer Juergen Schmidhuber did not sign the joint statement, emphasising that in 95% of all cases, AI research is about making "human lives longer and healthier and easier." 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." Andrew Ng also argued that "it's a mistake to fall for the doomsday hype on AI-and that regulators who do will only benefit vested interests." Yann LeCun "scoffs at his peers' dystopian scenarios of supercharged misinformation and even, eventually, human extinction."

Limiting AI

Possible options for limiting AI include: using Embedded Ethics or Constitutional AI where companies or governments can add a policy, restricting high levels of compute power in training, restricting the ability to rewrite its own code base, restrict certain AI techniques but not in the training phase, open-source (transparency) vs proprietary (could be more restricted), backup model with redundancy, restricting security, privacy and copyright, restricting or controlling the memory, real-time monitoring, risk analysis, emergency shut-off, rigorous simulation and testing, model certification, assess known vulnerabilities, restrict the training material, restrict access to the internet, issue terms of use.

Ethical machines and alignment

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. The field of machine ethics is also called computational morality, and was founded at an AAAI symposium in 2005.

Other approaches include Wendell Wallach's "artificial moral agents" and Stuart J. Russell's three principles for developing provably beneficial machines.

Frameworks

RESPECT the dignity of individual people

CONNECT with other people sincerely, openly and inclusively

CARE for the wellbeing of everyone

PROTECT social values, justice and the public interest

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.

Regulation

The first global AI Safety Summit was 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. The regulatory and policy landscape for AI is an emerging issue in jurisdictions globally. According to AI Index at Stanford, 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. Between 2016 and 2020, more than 30 countries adopted dedicated strategies for AI. Most EU member states had released national AI strategies, as had Canada, China, India, Japan, Mauritius, the Russian Federation, Saudi Arabia, United Arab Emirates, US and Vietnam. Others were in the process of elaborating their own AI strategy, including Bangladesh, Malaysia and Tunisia. The Global Partnership on Artificial Intelligence was 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. Henry Kissinger, Eric Schmidt, and Daniel Huttenlocher published a joint statement in November 2021 calling for a government commission to regulate AI. In 2023, OpenAI leaders published recommendations for the governance of superintelligence, which they believe may happen in less than 10 years. 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.

In a 2022 Ipsos survey, 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". A 2023 Reuters/Ipsos poll found that 61% of Americans agree, and 22% disagree, that AI poses risks to humanity. In a 2023 Fox News poll, 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".

In November 2023, the first global AI Safety Summit was held in Bletchley Park in the UK to discuss the near and far term risks of AI and the possibility of mandatory and voluntary regulatory frameworks. 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.

The study of mechanical or "formal" reasoning began with philosophers and mathematicians in antiquity. The study of logic led directly to Alan Turing's theory of computation, which suggested that a machine, by shuffling symbols as simple as "0" and "1", could simulate both mathematical deduction and formal reasoning, which is known as the Church-Turing thesis. This, along with concurrent discoveries in cybernetics and information theory, led researchers to consider the possibility of building an "electronic brain".

Alan Turing was thinking about machine intelligence at least as early as 1941, when he circulated a paper on machine intelligence which could be the earliest paper in the field of AI - though it is now lost. The first available paper generally recognized as "AI" was McCullouch and Pitts design for Turing-complete "artificial neurons" in 1943 - the first mathematical model of a neural network. The paper was influenced by Turing's earlier paper ' On Computable Numbers' from 1936 using similar two-state boolean 'neurons', but was the first to apply it to neuronal function.

The term 'machine intelligence' was used by Alan Turing during his life which was later often referred to as 'artificial intelligence' after his death in 1954. In 1950 Turing published the best known of his papers ' Computing Machinery and Intelligence', the paper introduced his concept of what is now known as the Turing test to the general public. Then followed three radio broadcasts on AI by Turing, the lectures: 'Intelligent Machinery, A Heretical Theory', 'Can Digital Computers Think'? and the panel discussion 'Can Automatic Calculating Machines be Said to Think'. By 1956 computer intelligence had been actively pursued for more than a decade in Britain; the earliest AI programmes were written there in 1951-1952.

In 1951, using a Ferranti Mark 1 computer of the University of Manchester, checkers and chess programs were wrote where you could play against the computer. The field of American AI research was founded at a workshop at Dartmouth College in 1956. The attendees became the leaders of AI research in the 1960s. They and their students produced programs that the press described as "astonishing": computers were learning checkers strategies, solving word problems in algebra, proving logical theorems and speaking English. Artificial Intelligence laboratories were set up at a number of British and US Universities in the latter 1950s and early 1960s.

They had, however, underestimated the difficulty of the problem. Both the U.S. and British governments cut off exploratory research in response to the criticism of Sir James Lighthill and ongoing pressure from the U.S. Congress to fund more productive projects. Minsky's and Papert's book Perceptrons was understood as proving that artificial neural networks would never be useful for solving real-world tasks, thus discrediting the approach altogether. The " AI winter", a period when obtaining funding for AI projects was difficult, followed.

In the early 1980s, AI research was revived by the commercial success of expert systems, 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's fifth generation computer project inspired the U.S. and British governments to restore funding for academic research. However, beginning with the collapse of the Lisp Machine market in 1987, AI once again fell into disrepute, and a second, longer-lasting winter began.

Many researchers began to doubt that the current practices would be able to imitate all the processes of human cognition, especially perception, robotics, learning and pattern recognition. A number of researchers began to look into "sub-symbolic" approaches. Robotics researchers, such as Rodney Brooks, rejected "representation" in general and focussed directly on engineering machines that move and survive. Judea Pearl, Lofti Zadeh and others developed methods that handled incomplete and uncertain information by making reasonable guesses rather than precise logic. But the most important development was the revival of " connectionism", including neural network research, by Geoffrey Hinton and others. In 1990, Yann LeCun successfully showed that convolutional neural networks can recognize handwritten digits, the first of many successful applications of neural networks.

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 as statistics, economics and mathematics). By 2000, solutions developed by AI researchers were being widely used, although in the 1990s they were rarely described as "artificial intelligence".

Deep learning began to dominate industry benchmarks in 2012 and was adopted throughout the field. For many specific tasks, other methods were abandoned. Deep learning's success was based on both hardware improvements ( faster computers, graphics processing units, cloud computing) and access to large amounts of data (including curated datasets, such as ImageNet).

Deep learning's success led to an enormous increase in interest and funding in AI. The amount of machine learning research (measured by total publications) increased by 50% in the years 2015-2019, and WIPO reported that AI was the most prolific emerging technology in terms of the number of patent applications and granted patents. According to 'AI Impacts', about $50 billion annually was invested in "AI" around 2022 in the US alone and about 20% of new US Computer Science PhD graduates have specialized in "AI"; about 800,000 "AI"-related US job openings existed in 2022. The large majority of the advances have occurred within the United States, with its companies, universities, and research labs leading artificial intelligence research.

Philosophy

Defining artificial intelligence

Alan Turing wrote in 1950 "I propose to consider the question 'can machines think'?" He advised changing the question from whether a machine "thinks", to "whether or not it is possible for machinery to show intelligent behaviour". He devised the Turing test, which measures the ability of a machine to simulate human conversation. 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 that we can not determine these things about other people but "it is usual to have a polite convention that everyone thinks"

Russell and Norvig agree with Turing that AI must be defined in terms of "acting" and not "thinking". However, they are critical that the test compares machines to people. " Aeronautical engineering texts," they wrote, "do not define the goal of their field as making 'machines that fly so exactly like pigeons that they can fool other pigeons.'" AI founder John McCarthy agreed, writing that "Artificial intelligence is not, by definition, simulation of human intelligence".

McCarthy defines intelligence as "the computational part of the ability to achieve goals in the world." Another AI founder, Marvin Minsky similarly defines it as "the ability to solve hard problems". 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, 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 or paradigm has guided AI research for most of its history. 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 mostly sub-symbolic, soft and narrow (see below). 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") 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 the physical symbol systems hypothesis: "A physical symbol system has the necessary and sufficient means of general intelligent action."

However, the symbolic approach failed on many tasks that humans solve easily, such as learning, recognizing an object or commonsense reasoning. Moravec's paradox is the discovery that high-level "intelligent" tasks were easy for AI, but low level "instinctive" tasks were extremely difficult. Philosopher Hubert Dreyfus had argued since 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. Although his arguments had been ridiculed and ignored when they were first presented, eventually, AI research came to agree with him.

The issue is not resolved: sub-symbolic reasoning can make many of the same inscrutable mistakes that human intuition does, such as algorithmic bias. Critics such as Noam Chomsky argue continuing research into symbolic AI will still be necessary to attain general intelligence, in part because sub-symbolic AI is a move away from explainable AI: it can be difficult or impossible to understand why a modern statistical AI program made a particular decision. The emerging field of neuro-symbolic artificial intelligence attempts to bridge the two approaches.

Neat vs. scruffy

Soft vs. hard computing

Finding a provably correct or optimal solution is intractable for many important problems. Soft computing is a set of techniques, including genetic algorithms, fuzzy logic and 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

Machine consciousness, sentience and mind

The philosophy of mind does not know whether a machine can have a mind, consciousness and mental 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. Russell and Norvig add 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." However, the question has become central to the philosophy of mind. It is also typically the central question at issue in artificial intelligence in fiction.

Consciousness

David Chalmers identified two problems in understanding the mind, which he named the "hard" and "easy" problems of consciousness. The easy problem is understanding how the brain processes signals, makes plans and controls behavior. The hard problem is explaining how this feels or 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). Human information processing is easy to explain, however, human subjective experience is 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 to know what red looks like.

Computationalism and functionalism

AI welfare and rights

It is difficult or impossible to reliably evaluate whether an advanced AI is sentient (has the ability to feel), and if so, to what degree. 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. Sapience (a set of capacities related to high intelligence, such as discernment or self-awareness) may provide another moral basis for AI rights. Robot rights are also sometimes proposed as a practical way to integrate autonomous agents into society.

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. Critics argued in 2018 that granting rights to AI systems would downplay the importance of human 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.

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 a moral blind spot analogous to slavery or factory farming, which could lead to large-scale suffering if sentient AI is created and carelessly exploited.

Superintelligence and the singularity

If research into artificial general intelligence produced sufficiently intelligent software, it might be able to reprogram and improve itself. The improved software would be even better at improving itself, leading to what I. J. Good called an " intelligence explosion" and Vernor Vinge called a " singularity".

Transhumanism

Robot designer Hans Moravec, cyberneticist Kevin Warwick, and inventor Ray Kurzweil have predicted that humans and machines will merge in the future into cyborgs that are more capable and powerful than either. This idea, called transhumanism, has roots in Aldous Huxley and Robert Ettinger.

The word "robot" itself was coined by Karel Čapek in his 1921 play R.U.R., the title standing for "Rossum's Universal Robots".

Thought-capable artificial beings have appeared as storytelling devices since antiquity, and have been a persistent theme in science fiction.

A common trope in these works began with Mary Shelley's Frankenstein, where a human creation becomes a threat to its masters. This includes such works as Arthur C. Clarke's and Stanley Kubrick's 2001: A Space Odyssey (both 1968), with HAL 9000, the murderous computer in charge of the Discovery One spaceship, as well as The Terminator (1984) and (1999). In contrast, the rare loyal robots such as Gort from The Day the Earth Stood Still (1951) and Bishop from (1986) are less prominent in popular culture.

Several works use AI to force us to confront the fundamental question of what makes us human, showing us artificial beings that have the ability to feel, and thus to suffer. This appears in Karel Čapek's , the films A.I. Artificial Intelligence and , as well as the novel Do Androids Dream of Electric Sheep?, by Philip K. Dick. Dick considers the idea that our understanding of human subjectivity is altered by technology created with artificial intelligence.

Explanatory notes

References

1. ^ Copeland, J., ed. (2004). The Essential Turing: the ideas that gave birth to the computer age. Oxford, England: Clarendon Press. ISBN 0-19-825079-7.

2. Dartmouth workshop: The proposal:

3. Funding initiatives in the early 1980s: Fifth Generation Project (Japan), Alvey (UK), Microelectronics and Computer Technology Corporation (US), Strategic Computing Initiative (US):

4. First AI Winter, Lighthill report, Mansfield Amendment

5. Problem solving, puzzle solving, game playing and deduction: ^

Russell & Norvig (2021, chpt. 3-5)

Russell & Norvig (2021, chpt. 6) (constraint satisfaction)

Poole, Mackworth & Goebel (1998, chpt. 2, 3, 7, 9)

Luger & Stubblefield (2004, chpt. 3, 4, 6, 8)

Nilsson (1998, chpt. 7-12)

6. Representing categories and relations: ^ Semantic networks, description logics, inheritance (including frames and scripts):

7. Representing events and time:^ Situation calculus, event calculus, fluent calculus (including solving the frame problem):

8. Default reasoning, Frame problem, default logic, non-monotonic logics, circumscription, closed world assumption, abduction: (Pooleet al. places abduction under "default reasoning". Luger et al. places this under "uncertain reasoning").

9. ^ Sensorless or "conformant" planning, contingent planning, replanning (a.k.a online planning):

10. ^ Non-parameteric learning models such as K-nearest neighbor and support vector machines:

11. Gradient calculation in computational graphs, ^ backpropagation, automatic differentiation:

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

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

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Weng, J.; McClelland; Pentland, A.; Sporns, O.; Stockman, I.; Sur, M.; Thelen, E. (2001). "Autonomous mental development by robots and animals" (PDF). Science. 291 (5504): 599-600. doi:10.1126/science.291.5504.599. PMID 11229402. S2CID 54131797. Archived (PDF) from the original on 4 September 2013 - via msu.edu.

Wirtz, Bernd W.; Weyerer, Jan C.; Geyer, Carolin (24 July 2018). "Artificial Intelligence and the Public Sector - Applications and Challenges". International Journal of Public Administration. 42 (7): 596-615. doi:10.1080/01900692.2018.1498103. ISSN 0190-0692. S2CID 158829602. Archived from the original on 18 August 2020.

Yudkowsky, E (2008), "Artificial Intelligence as a Positive and Negative Factor in Global Risk" (PDF), Global Catastrophic Risks, Oxford University Press, 2008, Bibcode:2008gcr..book..303Y, archived (PDF) from the original on 19 October 2013

Further reading

Ashish Vaswani, Noam Shazeer, Niki Parmar et al. "Attention is all you need." Advances in neural information processing systems 30 (2017). Seminal paper on transformers.

Autor, David H., "Why Are There Still So Many Jobs? The History and Future of Workplace Automation" (2015) 29(3) Journal of Economic Perspectives 3.

Boden, Margaret, Mind As Machine, Oxford University Press, 2006.

Cukier, Kenneth, "Ready for Robots? How to Think about the Future of AI", Foreign Affairs, vol. 98, no. 4 (July/August 2019), pp. 192-98. George Dyson, historian of computing, writes (in what might be called "Dyson's Law") that "Any system simple enough to be understandable will not be complicated enough to behave intelligently, while any system complicated enough to behave intelligently will be too complicated to understand." (p. 197.) Computer scientist Alex Pentland writes: "Current AI machine-learning algorithms are, at their core, dead simple stupid. They work, but they work by brute force." (p. 198.)

Domingos, Pedro, "Our Digital Doubles: AI will serve our species, not control it", Scientific American, vol. 319, no. 3 (September 2018), pp. 88-93. "AIs are like autistic savants and will remain so for the foreseeable future.... AIs lack common sense and can easily make errors that a human never would... They are also liable to take our instructions too literally, giving us precisely what we asked for instead of what we actually wanted." (p. 93.)

Gertner, Jon. (2023) "Wikipedia's Moment of Truth: Can the online encyclopedia help teach A.I. chatbots to get their facts right - without destroying itself in the process?" New York Times Magazine (July 18, 2023) online

Gleick, James, "The Fate of Free Will" (review of Kevin J. Mitchell, Free Agents: How Evolution Gave Us Free Will, Princeton University Press, 2023, 333 pp.), The New York Review of Books, vol. LXXI, no. 1 (18 January 2024), pp. 27-28, 30. "Agency is what distinguishes us from machines. For biological creatures, reason and purpose come from acting in the world and experiencing the consequences. Artificial intelligences - disembodied, strangers to blood, sweat, and tears - have no occasion for that." (p. 30.)

Hanna, Alex, and Emily M. Bender, "Theoretical AI Harms Are a Distraction: Fearmongering about artificial intelligence's potential to end humanity shrouds the real harm it already causes", Scientific American, vol 330, no. 2 (February 2024), pp. 69-70. "[H]ype [about "existential risks"] surrounds many AI firms, but their technology already enables myriad harms, including... discrimination in housing, criminal justice, and health care, as well as the spread of hate speech and misinformation... Large language models extrude... fluent... coherent-seeming text but have no understanding of what the text means, let alone the ability to reason.... (p. 69.) [T]hat output... becomes a noxious... insidious pollutant of our information ecosystem.... [T]oo many... publications [about] AI come from corporate labs or... academic groups that receive... industry funding. Many of these publications are based on junk science [that] is nonreproducible... is full of hype, and uses evaluation methods that do not measure what they purport to... Meanwhile 'AI doomers' cite this junk science... to [misdirect] attention [to] the fantasy of all-powerful machines possibly going rogue and destroying humanity." (p. 70.)

Hughes-Castleberry, Kenna, "A Murder Mystery Puzzle: The literary puzzle Cain's Jawbone, which has stumped humans for decades, reveals the limitations of natural-language-processing algorithms", Scientific American, vol. 329, no. 4 (November 2023), pp. 81-82. "This murder mystery competition has revealed that although NLP (natural-language processing) models are capable of incredible feats, their abilities are very much limited by the amount of context they receive. This [...] could cause [difficulties] for researchers who hope to use them to do things such as analyze ancient languages. In some cases, there are few historical records on long-gone civilizations to serve as training data for such a purpose." (p. 82.)

Immerwahr, Daniel, "Your Lying Eyes: People now use A.I. to generate fake videos indistinguishable from real ones. How much does it matter?", The New Yorker, 20 November 2023, pp. 54-59. "If by 'deepfakes' we mean realistic videos produced using artificial intelligence that actually deceive people, then they barely exist. The fakes aren't deep, and the deeps aren't fake. [...] A.I.-generated videos are not, in general, operating in our media as counterfeited evidence. Their role better resembles that of cartoons, especially smutty ones." (p. 59.)

Johnston, John (2008) The Allure of Machinic Life: Cybernetics, Artificial Life, and the New AI, MIT Press.

Jumper, John; Evans, Richard; Pritzel, Alexander; et al. (26 August 2021). "Highly accurate protein structure prediction with AlphaFold". Nature. 596 (7873): 583-589. Bibcode:2021Natur.596..583J. doi:10.1038/s41586-021-03819-2. PMC . PMID 34265844. S2CID 235959867.

LeCun, Yann; Bengio, Yoshua; Hinton, Geoffrey (28 May 2015). "Deep learning". Nature. 521 (7553): 436-444. Bibcode:2015Natur.521..436L. doi:10.1038/nature14539. PMID 26017442. S2CID 3074096. Archived from the original on 5 June 2023.

Marcus, Gary, "Am I Human?: Researchers need new ways to distinguish artificial intelligence from the natural kind", Scientific American, vol. 316, no. 3 (March 2017), pp. 61-63. Marcus points out a so far insuperable stumbling block to artificial intelligence: an incapacity for reliable disambiguation. "[V]irtually every sentence [that people generate] is ambiguous, often in multiple ways. Our brain is so good at comprehending language that we do not usually notice." A prominent example is the "pronoun disambiguation problem" ("PDP"): a machine has no way of determining to whom or what a pronoun in a sentence-such as "he", "she" or "it"-refers.

Marcus, Gary, "Artificial Confidence: Even the newest, buzziest systems of artificial general intelligence are stymmied by the same old problems", Scientific American, vol. 327, no. 4 (October 2022), pp. 42-45.

Mitchell, Melanie (2019). Artificial intelligence: a guide for thinking humans. New York: Farrar, Straus and Giroux. ISBN 9780374257835.

Mnih, Volodymyr; Kavukcuoglu, Koray; Silver, David; et al. (26 February 2015). "Human-level control through deep reinforcement learning". Nature. 518 (7540): 529-533. Bibcode:2015Natur.518..529M. doi:10.1038/nature14236. PMID 25719670. S2CID 205242740. Archived from the original on 19 June 2023. Introduced DQN, which produced human-level performance on some Atari games.

Press, Eyal, "In Front of Their Faces: Does facial-recognition technology lead police to ignore contradictory evidence?", The New Yorker, 20 November 2023, pp. 20-26.

Roivainen, Eka, "AI's IQ: ChatGPT aced a [standard intelligence] test but showed that intelligence cannot be measured by IQ alone", Scientific American, vol. 329, no. 1 (July/August 2023), p. 7. "Despite its high IQ, ChatGPT fails at tasks that require real humanlike reasoning or an understanding of the physical and social world.... ChatGPT seemed unable to reason logically and tried to rely on its vast database of... facts derived from online texts."

Serenko, Alexander; Michael Dohan (2011). "Comparing the expert survey and citation impact journal ranking methods: Example from the field of Artificial Intelligence" (PDF). Journal of Informetrics. 5 (4): 629-49. doi:10.1016/j.joi.2011.06.002. Archived (PDF) from the original on 4 October 2013.

Silver, David; Huang, Aja; Maddison, Chris J.; et al. (28 January 2016). "Mastering the game of Go with deep neural networks and tree search". Nature. 529 (7587): 484-489. Bibcode:2016Natur.529..484S. doi:10.1038/nature16961. PMID 26819042. S2CID 515925. Archived from the original on 18 June 2023.

White Paper: On Artificial Intelligence - A European approach to excellence and trust (PDF). Brussels: European Commission. 2020. Archived (PDF) from the original on 20 February 2020.

External links

# data[].attributes.attachment_link.description
Artificial intelligence ( AI) is the intelligence of machines or software, as opposed to the intelligence of living beings, primarily of humans. It is a field of study in computer science that develops and studies intelligent machines. Such machines may be called AIs. AI technology is widely used throughout industry, government, and science.