doug blank <blank@copper.ucs.indiana.edu> (05/31/91)
Archive-name: ai/neural-nets/blank-raam/1991-05-15
Archive: cheops.cis.ohio-state.edu:/pub/neuroprose/blank.raam.ps.Z [128.146.8.62]
Original-posting-by: doug blank <blank@copper.ucs.indiana.edu>
Reposted-by: emv@msen.com (Edward Vielmetti, MSEN)
Exploring the Symbolic/Subsymbolic Continuum:
A Case Study of RAAM
Douglas S. Blank (blank@iuvax.cs.indiana.edu)
Lisa A. Meeden (meeden@iuvax.cs.indiana.edu)
James B. Marshall (marshall@iuvax.cs.indiana.edu)
Indiana University
Computer Science and Cognitive Science
Departments
Abstract:
This paper is an in-depth study of the mechanics of recursive
auto-associative memory, or RAAM, an architecture developed by Jordan
Pollack. It is divided into three main sections: an attempt to place the
symbolic and subsymbolic paradigms on a common ground; an analysis of a
simple RAAM; and a description of a set of experiments performed on
simple "tarzan" sentences encoded by a larger RAAM.
We define the symbolic and subsymbolic paradigms as two opposing corners
of an abstract space of paradigms. This space, we propose, has roughly
three dimensions: representation, composition, and functionality. By
defining the differences in these terms, we are able to place actual
models in the paradigm space, and compare these models in somewhat common
terms.
As an example of the subsymbolic corner of the space, we examine in
detail the RAAM architecture, representations, compositional mechanisms,
and functionality. In conjunction with other simple feed-forward
networks, we create detectors, decoders and transformers which act
holistically on the composed, distributed, continuous subsymbolic
representations created by a RAAM. These tasks, although trivial for a
symbolic system, are accomplished without the need to decode a composite
structure into its constituent parts, as symbolic systems must do.
The paper can be found in the neuroprose archive as blank.raam.ps.Z; a
detailed example of how to retrieve the paper follows at the end of this
message. A version of the paper will also appear in your local bookstores
as a chapter in "Closing the Gap: Symbolism vs Connectionism," J.
Dinsmore, editor; LEA, publishers. 1992.
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% ftp cheops.cis.ohio-state.edu
Connected to cheops.cis.ohio-state.edu.
220 cheops.cis.ohio-state.edu FTP server (Ver Tue May 9 14:01 EDT 1989) ready.
Name (cheops.cis.ohio-state.edu:): anonymous
331 Guest login ok, send ident as password.
Password:neuron
230 Guest login ok, access restrictions apply.
ftp> binary
200 Type set to I.
ftp> cd pub/neuroprose
250 CWD command successful.
ftp> get blank.raam.ps.Z
200 PORT command successful.
150 Opening BINARY mode data connection for blank.raam.ps.Z (173015 bytes).
226 Transfer complete.
local: blank.raam.ps.Z remote: blank.raam.ps.Z
173015 bytes received in 1.6 seconds (1e+02 Kbytes/s)
ftp> bye
221 Goodbye.
% uncompress blank.raam.ps.Z
% lpr blank.raam.ps
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-- comp.archives file verification
cheops.cis.ohio-state.edu
-rw-r--r-- 1 3169 274 173015 May 6 22:02 /pub/neuroprose/blank.raam.ps.Z
found blank-raam ok
cheops.cis.ohio-state.edu:/pub/neuroprose/blank.raam.ps.Z