2 – A History of AI

• develop an understanding of how we can test for computer intelligence
• develop an understanding of what a CAPTCHA is and how to reverse it
• develop some understanding of the consequences of human-like AI

• artificial intelligence (AI)
• intelligence

• technology
• machine learning

• Turing test
• CAPTCHA

• How can we tell if a computer is intelligent or not?
  • What kind of questions would you ask it?
  • Would the test be virtual or physical?
  • Would you ask it to move, speak, think?

• Discuss in pairs and be ready to share your ideas with the class.

• Although people have long thought about the possibility of Machines that could think, the science of AI really started with Alan Turing, back in the 1950s.
• Turing had devised a hypothetical machine called The Turing Machine, that was capable of performing extremely complicated computations.
• Turing devised a party game, called The Imitation Game. In the game, a man (A) and woman (B) would each go off to separate rooms. They could then communicate with the guests at the party, but only through typed messages. The man and woman would try to convince the guests that they were the other.
• The game was invented only to introduce the second more interesting version.

We now ask the question, “What will happen when a machine takes the part of A in this game?” Will the interrogator decide wrongly as often when the game is played like this as he does when the game is played between a man and a woman? These questions replace our original, “Can machines think?”

The Imitation Game, Alan Turing, Mind, Volume LIX, Issue 236, October 1950, Pages 433–460, https://doi.org/10.1093/mind/LIX.236.433

• Turing was arguing, that if a machine can convincingly trick a questioner into thinking it was a human, then it can be classified as intelligent. Or more philosophically – what is the difference between a human and a computer that is indistinguishable from a human?
• Let’s see how a Turing Test is actually done.

• Open ELIZA in a new tab and have a chat with her.
• She was originally designed as a therapist.
• In 1966, Joseph Weizenbaum created ELIZA, that appeared to pass the Turing test.
• Weizenbaum’s program was able to fool some people into believing that they were talking to a real person, with some subjects being “very hard to convince that ELIZA was not human.
• Another more modern example would be Kuki. You will need to enter your email and enter the code you are sent to chat to Kuki.
• She has won many prizes in international competitions and the Turing Test.
• Write up your opinions on ELIZA and Kuki.
  • Do you think either of them passes the Turing Test? Explain your reasons.
  • Can you figure out the rules that dictate ELIZA’s responses? Write done the rules you have worked out.

• Reversing The Turing Test has become a focus for research over the past few years.
• This means inventing a test that only a human can pass, and computers will always fail.
• The most common form of reverse test, of which you will probably be familiar is CAPTCHA.

• The idea behind CAPTCHA is to present to the user an image that a computer would not be able to understand.
• Without CAPTCHA it would be trivial to design a bot that could register a billion different online email addresses that could be used to send spam, for instance.

• There is now an interesting battle between bots and CAPTCHA programs.
• In fact, Google have been using CAPTCHA to train their AIs.
• Read this article to learn a little more.
• Ironically, these AIs that are trained are then capable of solving Google’s own CAPTCHA which defeats the purpose of CAPTCHA.
• Read this article to learn a little more.
• Summarise your learnings from the above two articles with focusing on the evolutions of CAPTCHA to identify humans from ever more advanced bots.

Write an short 200 words essay, using this article as a starting point, and using good English and examples or scenarios on the following points:

• From a security point of view, what do you think the ramifications of computers being able to imitate humans successfully.
• How might criminals be able to use these technologies?
• How might security experts be able to counter these technologies?

In this lesson, you…

• Compared chat-bots and decided whether they pass the “Turing Test“.
• Found out what machine learning is and how it is transforming our lives.
• Wrote about the consequences of AI being able to imitate humans.

Next lesson, you will…

• Work in a group to research and present information on a current use or development of AI.