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Turing test
The Turing test is a test of a machine's ability to exhibit intelligent behavior equivalent to, or indistinguishable from, that of a human. Alan Turing proposed that a human evaluator would judge natural language conversations between a human and a machine that is designed to generate human-like responses. The evaluator would be aware that one of the two partners in conversation is a machine, and all participants would be separated from one another. The conversation would be limited to a text-only channel such as a computer keyboard and screen so that the result would not be dependent on the machine's ability to render words as speech.〔Turing originally suggested a teleprinter, one of the few text-only communication systems available in 1950. 〕 If the evaluator cannot reliably tell the machine from the human (Turing originally suggested that the machine would convince a human 70% of the time after five minutes of conversation), the machine is said to have passed the test. The test does not check the ability to give correct answers to questions, only how closely answers resemble those a human would give.
The test was introduced by Alan Turing in his 1950 paper "Computing Machinery and Intelligence," while working at The University of Manchester (Turing, 1950; p. 460).〔http://www.turing.org.uk/scrapbook/test.html〕 It opens with the words: "I propose to consider the question, 'Can machines think?'" Because "thinking" is difficult to define, Turing chooses to "replace the question by another, which is closely related to it and is expressed in relatively unambiguous words." Turing's new question is: "Are there imaginable digital computers which would do well in the ''imitation game''?"〔 Turing does not call his idea "Turing test", but rather the "Imitation Game"; however, later literature has reserved the term "Imitation game" to describe a particular version of the test. See #Versions of the Turing test, below. Turing gives a more precise version of the question later in the paper: "()hese questions () equivalent to this, 'Let us fix our attention on one particular digital computer C. Is it true that by modifying this computer to have an adequate storage, suitably increasing its speed of action, and providing it with an appropriate programme, C can be made to play satisfactorily the part of A in the imitation game, the part of B being taken by a man?'" 〕 This question, Turing believed, is one that can actually be answered. In the remainder of the paper, he argued against all the major objections to the proposition that "machines can think".〔 and see , where they comment, "Turing examined a wide variety of possible objections to the possibility of intelligent machines, including virtually all of those that have been raised in the half century since his paper appeared."〕
Since Turing first introduced his test, it has proven to be both highly influential and widely criticised, and it has become an important concept in the philosophy of artificial intelligence.
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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