hyperdimensional cognitive computing: a new approach to ......hyperdimensional cognitive computing:...
TRANSCRIPT
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Hyperdimensional Cognitive Computing: A New Approach to
Some Very Old Problems
Simon D. LevyWashington & Lee University
Lexington, Virginia, USA
Tuesday, April 14, 2009
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Inspiration(s)
[I]t turns out that we don’t think the way we think we think! ... The scientific evidence coming in all around us is clear: Symbolic conscious reasoning, which is extracted through protocol analysis from serial verbal introspection, is a myth.
− J. Pollack (2005)
[W]hat kinds of things suggested by the architecture of the brain, if we modeled them mathematically, could give some properties that we associate with mind?
− P. Kanerva (to appear)
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What is Mind?
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What is Mind?
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The Need for New Representational Principles• Ecological affordances (Gibson
1979); exploiting the environment (Clark 1998)
• Distributed/Connectionist Representations (PDP 1986)
• Holographic Representations (Gabor 1971; Plate 2003)
• Fractals / Attractors / Dynamical Systems (Tabor 2000; Levy & Pollack 2001)
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The Need for New Representational Principles• Ecological affordances (Gibson
1979); exploiting the environment (Clark 1998)
• Distributed/Connectionist Representations (PDP 1986)
• Holographic Representations (Gabor 1971; Plate 2003)
• Fractals / Attractors / Dynamical Systems (Tabor 2000; Levy & Pollack 2001)
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Pitfalls to Avoid
1. The “Short Circuit” (Localist Connectionist) Approachi) Traditional models of phenomenon X (language) use entities A,
B, C, ... (Noun Phrase, Phoneme, ...)
ii) We wish to model X in a more biologically realistic way.
iii) Therefore our model of X will have a neuron (pool) for A, one for B, one for C, etc.
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a.k.a. The Reese’s Peanut Butter Cup Model
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E.g. Neural Blackboard Model (van der Velde & de Kamps 2006)
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Benefits of Localism (Page 2000)
• Transparent (one node, one concept)
• Supports lateral inhibition / winner-takes all
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Lateral Inhibition (WTA)
A B C
L1
L2
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Problems with Localism
• Philosophical problem: “fresh coat of paint on old rotting theories” (MacLennan 1991): what new insights does “neuro-X” provide?
• Engineering problem: need to recruit new hardware for each new concept/combination leads to combinatorial explosion (Stewart & Eliasmith 2008)
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The Appeal of Distributed
Representations(Rumelhart &
McClelland 1986)
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WALK
WALKED
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ROAR
ROARED
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SPEAK
SPOKE
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GO
WENT
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ignores(mary, john)
Mary won’t give John the time of day.
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Challenges (Jackendoff 2002)
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I. The Binding Problem
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II. The Problem of Two
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III. The Problem of Variables
ignores(X, Y)
X won’t give Y the time of day.
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IV. Binding in Working Memory vs. Long-Term Memory
ignores(X, Y) X won’t give Y the time of day.
Long-term memory (idiosyncratic):
transitive-action(X, Y, Z) X Verb Y Z
Working memory (“rule-based”):
Mary gave John an apple.
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Vector Symbolic Architectures
(Plate 1991; Kanerva 1994; Gayler 1998)
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Tensor Product Binding(Smolensky 1990)
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Binding
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Bundling
+ =
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Unbinding (query)
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Lossy
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Lossy
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Cleanup
Hebbian / Hopfield /
Attractor Net
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Reduction(Holographic; Plate 2003)
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Reduction(Binary;
Kanerva 1994,Gayler 1998)
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Composition / Recursion
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Variables
X
john
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Scaling Up
• With many (> 10K) dimensions, get
• Astronomically large # of mutually orthogonal vectors (symbols)
• Surprising robustness to noise
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Pitfalls to Avoid
2. The Homunculus problem, a.k.a. Ghost in the Machine(Ryle 1949)
In cognitive modeling, the homunculus is the researcher: supervises learning, hand-builds representations, etc.
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Banishing the Homunculus
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Step I: Automatic Variable Substitution
• If A is a vector over {+1,-1}, then A*A = vector of 1’s (multiplicative identity)
• Supports substitution of anything for anything: everything (names, individuals, structures, propositions) can be a variable!
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“What is the Dollar of Mexico?” (Kanerva, to appear)
• Let X = <country>, Y = <currency>, A = <USA>, B = <Mexico>
• Then A = X*U + Y*D, B = X*M + Y*PD*A*B =
D*(X*U + Y*D) * (X*M + Y*P) =
(D*X*U + D*Y*D) * (X*M + Y*P) =
(D*X*U + Y) * (X*M + Y*P) =
D*X*U*X*M + D*X*U*Y*P + Y*X*M + Y*Y*P =
P + noise
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Learning Grammatical Constructions from a Single Example (Levy, to appear)
• Given
• Meaning: KISS(MARY, JOHN)
• Form: Mary kissed John
• Lexicon: KISS/kiss, MARY/Mary, ...
• What is the form for HIT(BILL, FRED) ?
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Learning Grammatical Constructions from a Single Example (Levy, to appear)
(ACTION*KISS + AGENT*MARY + PATIENT*JOHN) *
(P1*Mary + P2*kissed + P3*John) *
(KISS*kissed + MAY*Mary + JOHN*John + BILL*Bill + FRED*Fred + HIT*hit) *
(ACTION*HIT + AGENT*BILL + PATIENT*FRED) =
....
= (P1*Bill + P2*hit + P3*Fred) + noise
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Step II: Distributed “Lateral Inhibition”
• Analogical mapping as holistic graph isomorphsm (Gayler & Levy, in progress)
cf. Pelillo (1999)
A
B
C D
P
Q
R S
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A
B
C D
P
Q
R S
Possibilities x: A*P + A*Q + A*R + A*S + ... + D*S
Evidence w: A*B*P*Q + A*B*P*R +...+ B*C*Q*R + .. + C*D*R*S
X*W = A*Q + B*R + ... + A*P + ... + D*S
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∧
c∧
c
w * cleanup /∑
xt
xt+1πt
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Future Work: Automatic Decomposition
MSC (Arathorn 2002)Tuesday, April 14, 2009
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MSC (Arathorn 2002)Tuesday, April 14, 2009