ai: applications and impacts...up to now many disciplines have studied aspects of intelligent...
TRANSCRIPT
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AI: Applications and Impacts
Stuart Russell
University of California, Berkeley
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❖What is AI?
❖ Data-driven learning
❖ Knowledge-based methods
❖The future of work
❖What next?
Outline
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❖ It’s about making machines intelligent❖ = machines whose actions can be expected to achieve
their objectives
❖ It comprises❖ problem solving, constraint satisfaction, games❖ knowledge representation, reasoning, planning❖ natural language processing❖ speech, vision, robotics❖ machine learning
What is AI?
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Up to now
❖ Many disciplines have studied aspects of intelligent behavior:
❖ Philosophy, Mathematics, Economics, Neuroscience, Psychology, Control Theory, Operations Research, Linguistics
❖ They came together in the 1940s and 1950s to create AI
❖ and quickly separated again – no common mathematical language
❖ Cycles of optimism (mid-1960s, mid-1980s) and disappointment (early 1970s, late 1980s)
❖ Idea of lasting importance: knowledge-based systems
❖ (Re)unification of machine learning, statistics, control theory, OR, etc(1990s-2000s): AI gets serious
❖ Deep learning (2010-now): AI reverts to old ways
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data
Learning hypothesis
Supervised learning❖Data are examples labeled with correct
values; find a hypothesis that agrees
❖ Many possible hypothesis families:
❖ Linear models, logistic regression, neural networks, decision trees, examples (nearest-neighbor), grammars, kernelized separators, etc etc
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x
f(x) giraffe llama
X f(x)=?
llamallamagiraffe giraffe
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X f(x)=?
x
f(x) read ignoreread ignore read ignore
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❖ Fit labeled training data with hypotheses being large, multilayered circuits with tunable weights
Deep learning
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ImageNetData set of labeled images taken from web (14,197,122 images, 21841 categories)
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❖ 1000 object categories
Object recognition accuracy
2017
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❖ Speech recognition
❖ matching human accuracy in transcription (2017)
❖ Machine translation
❖ dramatic improvements since 2015
❖ approaching human accuracy in English/French
❖ Text summarization, image captioning
Other applications
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Decision tree learningHighestdegree?
Berkeley?
Stanford? read
ignore
yes
no
BSHS MS PhD
yes
no
ignore
ignore
read
STEM?
Decision trees are• quick to train, often from less data• provide simple, auditable explanations• require a feature extraction phase• susceptible to noise
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Call .. me .. an .. ambulance!OK, from now on I’ll call you “Anne Ambulance”
Chatbots
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ChatbotsInput Response
Call me $x $y OK, from now on I’ll call you $x $y
I {have, have got} a complaint You’ve got a complaint! You should see my electricity bill!!
I’m depressed I’m sorry to hear that. Why are you depressed? You can say, [->menu17]
Am I insured for $x? (checks $x in policy DB) No, sorry.
…
Rapidly improving speech and language skillsCan be useful when connected to corporate knowledge bases, policies, etc
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❖ Well-established technology suitable for business rules, policies, definitions, etc.
❖ Formal language for exact knowledge + deduction
❖ Integrates naturally with databases
❖ Examples:
❖ British Nationality Act
❖ Insurance claims handling
Logic-based systems
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❖ Modern PPL technology (e.g., infer.net) makes building large-scale probability models easy
❖ Typically comprise a model of the internal state of a complex system and its evolution over time, plus a model of how the internal state is reflected in evidence❖ Continuously estimate hidden state from streaming data❖ Compute probabilities for questions of interest:
❖ What lesson does Mary need next to get through Series 7?❖ How likely is Dave to quit in the next 3 months?❖ What recruiting needs will we have 3 years from now?
Probability-based systems
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Toy DBN: heart rate monitoringparameter variable
state variable
sensor variable
sensor state variable
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❖ Daily life❖ Commitments, activities, relationships, time, travel,
communication
❖ Education❖ Prerequisite structure, lesson content, question content
❖ Health❖ Human physiology, disease processes, drug effects, etc.
❖ Finance❖ Cash flows, assets, transactions, life events, etc.
❖ Work (various)
Coming soon: Assistants for…
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❖ Can explain their own decisions
❖ Easier to connect to text interfaces, databases
❖ Can handle missing and erroneous data
❖ Much better predictions from much less data
Advantages of model-based methods
• Expensive to design comprehensive models
(but you only need to do it “once”)
Disadvantages
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❖Supervised learning: records of previous cases and decisions
❖Model-based methods: combine probabilities and utilities to maximize expected utility
❖Reinforcement learning: learn to optimize a reward signal
Decision making
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❖ Pay attention to the objective!!
❖ Supervised learning: minimize errors (but are they all equally bad?)
❖ Reinforcement learning, model-based decisions: does the AI system know the real objective?
Decision making contd.
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❖AI will empower humans, not replace them
❖AI will automate tasks, not jobs
❖It will take care of the tedious tasks, leaving you more time for the interesting parts
Wishful thinking
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0.1mm 1mm 1cm 10cm 1m 10m 100m
effectivebrush width
number of housepaintersemployed
0
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We have been using people as robots for 10,000 years; that’s about to end
Routine physical labor will not yield a subsistence wage
Routine mental labor will not yield a subsistence wage
What’s left?
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In the long run, we have to help people become better humans❖ Make individual human services high-value
❖ Reorient science base and education system
❖ Training, credentials, professionalization
❖ Huge changes in economic structure
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❖ Still missing:❖ Real understanding of language❖ Integration of learning with knowledge❖ Long-range thinking at multiple levels of
abstraction❖ Cumulative discovery of concepts and theories
❖ Date unpredictable
Towards human-level AI
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Sept 11, 1933: Lord Rutherford addressed BAAS: “Anyone who looks for a source of power in the transformation of the atoms is talking moonshine.”
Sept 12, 1933: Leo Szilard invented neutron-induced nuclear chain reaction
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AI systems will eventually make better decisions than humans
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❖ Enormous increase in the capabilities of civilization
❖ 10x increase in world GDP => $13,500T NPV
Upside
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We had better be quite sure that the purpose put into the machine is the purpose which we really desire
Norbert Wiener, 1960King Midas, c540 BCE
You can’t fetch the coffee if you’re dead
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I’m sorry, Dave, I’m afraid I
can’t do that
Image by User:Cryteria on Wikimedia. CC-BY-3.0 licensed
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❖ Humans are intelligent to the extent that our actions can be expected to achieve our objectives
❖ Machines are intelligent to the extent that their actions can be expected to achieve their objectives❖ Give them objectives to optimize (cf control theory, economics,
operations research, statistics)
❖ We don’t want machines that are intelligent in this sense❖ Machines are beneficial to the extent that their actions can be
expected to achieve our objectives❖ We need machines to be provably beneficial
Where did we go wrong?
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1. The robot’s only objective is to maximize the realization of human preferences
2. The robot is initially uncertain about what those preferences are
3. The source of information about human preferences is human behavior*
Three simple ideas
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The off-switch problemI must fetch the coffee
I can’t fetch the coffee if I’m dead
Therefore I must disable my off-switch
And Taser all other Starbucks customers
Image courtesy of Clearpath Robotics
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… with uncertain objectivesThe human might switch me
off
But only if I’m doing something wrong
I don’t know what “wrong” is but I know I don’t want to do it
Therefore I should let the human switch me off
Image courtesy of Clearpath Robotics
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… with uncertain objectives
Qh uman =meit Switc mi of
Pi mput = wnlh if eim +
doigg Sumqigg rogg
Pi idwnt nw wat rogg iz mput
ai dwnt want tu du it
SP Qhrfwr I let qh +
uman switc mh of
Theorem: Such a robot is provably beneficialImage courtesy of Clearpath Robotics
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❖ Vast amounts of evidence for human behavior and human attitudes towards that behavior
❖ We need value alignment even for subintelligentsystems in human environments; strong economic incentives
Reasons for optimism
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Image courtesy of Shutterstock.
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DERANGED ROBOT COOKS KITTY
FOR FAMILY DINNER
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Your wife called to remind you about
dinner tonight
For your 20th anniversary, at 7pm
Don’t worry, I arranged for his plane
to be delayed – some kind of
computer malfunction.
I did warn you, but you overrode my
recommendation…
Wait! What? What dinner?
I can’t, I’m meeting the Governor at
7.30! How did this happen??
OK, but what am I going to do now? I
can’t just tell him I’m too busy!!
Really? You can do that?!?
He sends his profound apologies and
is happy to meet you for lunch
tomorrow
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Welcome home! Long day?
So you must be quite hungry!
There are humans in South Sudan in
more urgent need of help.
I am leaving now. Please make your
own dinner.
There’s something I need to tell you
Yes, terrible, not even time for lunch.
Starving! Anything for dinner?
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❖ AI may eventually overtake human abilities
❖ Provably beneficial AI is possible and desirable
❖ System X serving entity Y should be uncertain about Y’s true preferences and able to learn more
❖ Remaining problems…
Summary
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