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The Copycat Architecture

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					How Minds Work 
The Copycat Architecture 

             Stan Franklin 
        Computer Science Division & 
       Institute for Intelligent Systems 
         The University of Memphis




                                            1 
    Copycat Architecture 
•  Hi­level perception 
•  Analogy making 
•  Creative 
•  Parts—Slipnet, workspace, codelets 
•  No central executive 
•  Decisions made by codelets

    HMW: Pandemonium Theory              2 
Alphabetical Analogies 
•    abc    —>       abd        ijk       —>  ? 
•    abc    —>       abd        xyz       —>  ? 
•    abc    —>       abd        iijjkk    —>  ? 
•    abc    —>       abd        srqp      —>  ?




     HMW: Pandemonium Theory                       3 
                      Slipnet 
•  Directed graph of nodes, representing 
   concepts, and labeled links 
•  Links represent relations between nodes 
•  Nodes support activation, links pass it 
•  Slipnet does not learn 
•  Nodes don’t decay, but activation does 
•  Slipnet is long­term memory

      HMW: Pandemonium Theory           4 
         Slipnet at Work 
•  Relevant nodes activated by codelets 
•  Nodes spread activation to neighbors 
   over links, starting with nearest 
•  Concepts close to relevant concepts 
   become relevant 
•  Slipnet settles, activation pattern 
   becomes stable

    HMW: Pandemonium Theory            5 
          Fluid Concepts 
•  Region of the Slipnet 
•  Concept node at the core (center) 
•  Neighboring nodes included 
   stochastically by context dependent 
   similarity 
•  Fluid concepts vary over time, are 
   emergent, and aren’t explicitly 
   represented

    HMW: Pandemonium Theory               6 
               Workspace 
•  Codelets build perceptual structures 
   using information from the Slipnet 
•  Information—nodes, links, labels 
•  Structure represents Copycat’s 
   current appraisal of the situation



    HMW: Pandemonium Theory            7 
 Interactive Problem Solving 
•  Bottom­up workspace influence activates 
   relevant Slipnet nodes 
•  Spreading activation identifies other 
   relevant nodes 
•  Top­down Slipnet influence activates 
   relevant codelets who change the 
   workspace 
•  Eventually, some codelet decides to stop

      HMW: Pandemonium Theory           8 
    Temperature Control 
•  High temperature = more randomness 
   in choices of codelets & their actions 
•  Low temperature = more stability 
•  Temperature inversely measures 
   system’s understanding of the situation 
•  Temperature controlled, parallel 
   terraced scan 
•  Example run in Artificial Minds
     HMW: Pandemonium Theory            9 
                           Readings 
Copycat Architecture 
•  Hofstadter, D. R. The Copycat 
   Project:An Experiment in 
   Nondeterminism and Creative 
   Analogies. AI Memo 755. Artificial 
   Intelligence Laboratory, Mass. 
   Institute of Technology 
•  Mitchell, M. 1993. Analogy­Making 
   as Perception. Cambridge MA: The 
   MIT Press 
•  Franklin, S. 1995. Artificial 
   Minds. Cambridge MA: MIT 
   Press




              HMW: Pandemonium Theory    10 
Email and Web Addresses 
•  Stan Franklin 
   – franklin@memphis.edu 
   – www.cs.memphis.edu/~franklin 

•  “Conscious” Software Research Group 
    – www. csrg.memphis.edu/



     HMW: Pandemonium Theory              11 

				
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Description: "copycat": "copycat", on behalf of those Zhanshanweiwang site, has not officially under the jurisdiction of the means. "copycat" is to rely on copying, imitation, spoof and other means to grow up, anti-authority, anti-mainstream, and with the revelry, deconstructive, and post-modern anti-intellectual subculture characterized by mass culture. As a new culture, follow the trend of never less to be proud of the copycat, copycat behavior in a class of people, began to gather together people claiming to copycat, and copycat copycat products were produced naturally as knockoff. Today knockoff began strange refers to those peculiar commodity.