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What is consciousness?
Can an artificial machine really think?
Does the mind just consist of neurons in the brain,
or is there some intangible spark at its core?
For many, these have been vital considerations
for the future of artificial intelligence.
But British computer scientist Alan Turing decided to disregard all these questions
in favor of a much simpler one:
can a computer talk like a human?
This question led to an idea for measuring aritificial intelligence
that would famously come to be known as the Turing test.
In the 1950 paper, "Computing Machinery and Intelligence,"
Turing proposed the following game.
A human judge has a text conversation with unseen players
and evaluates their responses.
To pass the test, a computer must be able to replace one of the players
without substantially changing the results.
In other words, a computer would be considered intelligent
if its conversation couldn't be easily distinguished from a human's.
Turing predicted that by the year 2000,
machines with 100 megabytes of memory would be able to easily pass his test.
But he may have jumped the gun.
Even though today's computers have far more memory than that,
few have succeeded,
and those that have done well
focused more on finding clever ways to fool judges
than using overwhelming computing power.
Though it was never subjected to a real test,
the first program with some claim to success was called ELIZA.
With only a fairly short and simple script,
it managed to mislead many people by mimicking a psychologist,
encouraging them to talk more
and reflecting their own questions back at them.
Another early script PARRY took the opposite approach
by imitating a paranoid schizophrenic
who kept steering the conversation back to his own preprogrammed obsessions.
Their success in fooling people highlighted one weakness of the test.
Humans regularly attribute intelligence to a whole range of things
that are not actually intelligent.
Nonetheless, annual competitions like the Loebner Prize,
have made the test more formal
with judges knowing ahead of time
that some of their conversation partners are machines.
But while the quality has improved,
many chatbot programmers have used similar strategies to ELIZA and PARRY.
1997's winner Catherine
could carry on amazingly focused and intelligent conversation,
but mostly if the judge wanted to talk about Bill Clinton.
And the more recent winner Eugene Goostman
was given the persona of a 13-year-old Ukrainian boy,
so judges interpreted its nonsequiturs and awkward grammar
as language and culture barriers.
Meanwhile, other programs like Cleverbot have taken a different approach
by statistically analyzing huge databases of real conversations
to determine the best responses.
Some also store memories of previous conversations
in order to improve over time.
But while Cleverbot's individual responses can sound incredibly human,
its lack of a consistent personality
and inability to deal with brand new topics
are a dead giveaway.
Who in Turing's day could have predicted that today's computers
would be able to pilot spacecraft,
perform delicate surgeries,
and solve massive equations,
but still struggle with the most basic small talk?
Human language turns out to be an amazingly complex phenomenon
that can't be captured by even the largest dictionary.
Chatbots can be baffled by simple pauses, like "umm..."
or questions with no correct answer.
And a simple conversational sentence,
like, "I took the juice out of the fridge and gave it to him,
but forgot to check the date,"
requires a wealth of underlying knowledge and intuition to parse.
It turns out that simulating a human conversation
takes more than just increasing memory and processing power,
and as we get closer to Turing's goal,
we may have to deal with all those big questions about consciousness after all.


【TED-Ed】The Turing test: Can a computer pass for a human? - Alex Gendler

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黃于珍 2016 年 5 月 4 日 に公開
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