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Human based computation (HBC), human assisted computation, ubiquitous human computing or distributed thinking (by analogy to distributed computing) is a computer science technique in which a machine performs its function by outsourcing certain steps to humans, usually as microwork. This approach uses differences in abilities and alternative costs between humans and computer agents to achieve symbiotic human–computer interaction. For computationally difficult tasks such as image recognition, human based computation plays a central role in training Deep Learning based Artificial Intelligence systems. In this case, human based computation has been referred to as human aided artificial intelligence. In traditional computation, a human employs a computer to solve a problem; a human provides a formalized problem description and an algorithm to a computer, and receives a solution to interpret. Human based computation frequently reverses the roles; the computer asks a person or a large group of people to solve a problem, then collects, interprets, and integrates their solutions. This turns hybrid networks of humans and computers into "large scale distributed computing networks". where code is partially executed in human brains and on silicon based processors.

Human based computation (apart from the historical meaning of "computer") research has its origins in the early work on interactive evolutionary computation (EC). The idea behind interactive evolutionary algorithms has been attributed to Richard Dawkins; in the Biomorphs software accompanying his book The Blind Watchmaker (Dawkins, 1986) the preference of a human experimenter is used to guide the evolution of two dimensional sets of line segments. In essence, this program asks a human to be the fitness function of an evolutionary algorithm, so that the algorithm can use human visual perception and aesthetic judgment to do something that a normal evolutionary algorithm cannot do. However, it is difficult to get enough evaluations from a single human if we want to evolve more complex shapes. Victor Johnston and Karl Sims extended this concept by harnessing the power of many people for fitness evaluation (Caldwell and Johnston, 1991; Sims, 1991). As a result, their programs could evolve beautiful faces and pieces of art appealing to the public. These programs effectively reversed the common interaction between computers and humans. In these programs, the computer is no longer an agent of its user, but instead, a coordinator aggregating efforts of many human evaluators. These and other similar research efforts became the topic of research in aesthetic selection or interactive evolutionary computation (Takagi, 2001), however the scope of this research was limited to outsourcing evaluation and, as a result, it was not fully exploring the full potential of the outsourcing. A concept of the automatic Turing test pioneered by Moni Naor (1996) is another precursor of human based computation. In Naor's test, the machine can control the access of humans and computers to a service by challenging them with a natural language processing (NLP) or computer vision (CV) problem to identify humans among them. The set of problems is chosen in a way that they have no algorithmic solution that is both effective and efficient at the moment. If it existed, such an algorithm could be easily performed by a computer, thus defeating the test. In fact, Moni Naor was modest by calling this an automated Turing test. The imitation game described by Alan Turing (1950) didn't propose using CV problems. It was only proposing a specific NLP task, while the Naor test identifies and explores a large class of problems, not necessarily from the domain of NLP, that could be used for the same purpose in both automated and non automated versions of the test. Finally, Human based genetic algorithm (HBGA) encourages human participation in multiple different roles. Humans are not limited to the role of evaluator or some other predefined role, but can choose to perform a more diverse set of tasks. In particular, they can contribute their innovative solutions into the evolutionary process, make incremental changes to existing solutions, and perform intelligent recombination. In short, HBGA allows humans to participate in all operations of a typical genetic algorithm. As a result of this, HBGA can process solutions for which there are no computational innovation operators available, for example, natural languages. Thus, HBGA obviated the need for a fixed representational scheme that was a limiting factor of both standard and interactive EC. These algorithms can also be viewed as novel forms of social organization coordinated by a computer, according to Alex Kosorukoff and David Goldberg.

(HC) Darwin (Vyssotsky, Morris, McIlroy, 1961) and Core War (Jones, Dewdney 1984) These are games where several programs written by people compete in a tournament (computational simulation) in which fittest programs will survive. Authors of the programs copy, modify, and recombine successful strategies to improve their chances of winning. (CH) Interactive EC (Dawkins, 1986; Caldwell and Johnston, 1991; Sims, 1991) IEC enables the user to create an abstract drawing only by selecting his/her favorite images, so the human only performs fitness computation and software performs the innovative role. [Unemi 1998] Simulated breeding style introduces no explicit fitness, just selection, which is easier for humans. (HH2) Wiki (Cunningham, 1995) enabled editing the web content by multiple users, i. e. supported two types of human based innovation (contributing new page and its incremental edits). However, the selection mechanism was absent until 2002, when wiki has been augmented with a revision history allowing for reversing of unhelpful changes. This provided means for selection among several versions of the same page and turned wiki into a tool supporting collaborative content evolution (would be classified as human based evolution strategy in EC terms). (HH3) Human based genetic algorithm (Kosorukoff, 1998) uses both human based selection and three types of human based innovation (contributing new content, mutation, and recombination). Thus, all operators of a typical genetic algorithm are outsourced to humans (hence the origin of human based). This idea is extended to integrating crowds with genetic algorithm to study creativity in 2011. (HH1) Social search applications accept contributions from users and attempt to use human evaluation to select the fittest contributions that get to the top of the list. These use one type of human based innovation. Early work was done in the context of HBGA. Digg and Reddit are recently popular examples. See also Collaborative filtering. (HC) Computerized tests. A computer generates a problem and presents it to evaluate a user. For example, CAPTCHA tells human users from computer programs by presenting a problem that is supposedly easy for a human and difficult for a computer. While CAPTCHAs are effective security measures for preventing automated abuse of online services, the human effort spent solving them is otherwise wasted. The reCAPTCHA system makes use of these human cycles to help digitize books by presenting words from scanned old books that optical character recognition cannot decipher. (HC) Interactive online games: These are programs that extract knowledge from people in an entertaining way. (HC) "Human Swarming" or "Social Swarming". The UNU platform for human swarming establishes real time closed loop systems around groups of networked users molded after biological swarms, enabling human participants to behave as a unified collective intelligence. (NHC) Natural Human Computation involves leveraging existing human behavior to extract computationally significant work without disturbing that behavior. NHC is distinguished from other forms of human based computation in that rather than involving outsourcing computational work to human activity by asking humans to perform novel computational tasks, it involves taking advantage of previously unnoticed computational significance in existing behavior.

Viewed as a form of social organization, human based computation often surprisingly turns out to be more robust and productive than traditional organizations. The latter depend on obligations to maintain their more or less fixed structure, be functional and stable. Each of them is similar to a carefully designed mechanism with humans as its parts. However, this limits the freedom of their human employees and subjects them to various kinds of stresses. Most people, unlike mechanical parts, find it difficult to adapt to some fixed roles that best fit the organization. Evolutionary human computation projects offer a natural solution to this problem. They adapt organizational structure to human spontaneity, accommodate human mistakes and creativity, and utilize both in a constructive way. This leaves their participants free from obligations without endangering the functionality of the whole, making people happier. There are still some challenging research problems that need to be solved before we can realize the full potential of this idea. The algorithmic outsourcing techniques used in human based computation are much more scalable than the manual or automated techniques used to manage outsourcing traditionally. It is this scalability that allows to easily distribute the effort among thousands (or more) of participants. It was suggested recently that this mass outsourcing is sufficiently different from traditional small scale outsourcing to merit a new name: crowdsourcing. However, others have argued that crowdsourcing ought to be distinguished from true human based computation. Crowdsourcing does indeed involve the distribution of computation tasks across a number of human agents, but Michelucci argues that this is not sufficient for it to be considered human computation. Human computation requires not just that a task be distributed across different agents, but also that the set of agents across which the task is distributed be mixed: some of them must be humans, but others must be traditional computers. It is this mixture of different types of agents in a computational system that gives human based computation its distinctive character. Some instances of crowdsourcing do indeed meet this criterion, but not all of them do. Human Computation organizes workers through a task market with APIs, task prices, and software as a service protocols that allow employers / requesters to receive data produced by workers directly in to IT systems. As a result, many employers attempt to manage worker automatically through algorithms rather than responding to workers on a case by case basis or addressing their concerns. Responding to workers is difficult to scale to the employment levels enabled by human computation microwork platforms. Workers in the system Mechanical Turk, for example, have reported that human computation employers can be unresponsive to their concerns and needs

Human based computation has been criticized as exploitative and deceptive with the potential to undermine collective action. In social philosophy it has been argued that human based computation is an implicit form of online labour. The philosopher Rainer Mühlhoff distinguishes five different types of "machinic capture" of human microwork in "hybrid human computer networks": (1) gamification, (2) "trapping and tracking" (e. g. CAPTCHAs or click tracking in Google search), (3) social exploitation (e. g. tagging faces on Facebook), (4) information mining and (5) click work (such as on Amazon Mechanical Turk). Mühlhoff argues that human based computation often feeds into Deep Learning based Artificial Intelligence systems, a phenomenon he analyzes as "human aided artificial intelligence".