TR announcement (hardcopy and ftp)

[Nici Schraudolph]

The following technical report is now available in print:

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        Dynamic Parameter Encoding for Genetic Algorithms
        -------------------------------------------------

           Nicol N. Schraudolph       Richard K. Belew


The selection of fixed binary gene representations for real-valued
parameters of the phenotype required by Holland's genetic algorithm
(GA) forces either the sacrifice of representational precision for
efficiency of search or vice versa.  Dynamic Parameter Encoding (DPE)
is a mechanism that avoids this dilemma by using convergence statistics
derived from the GA population to adaptively control the mapping from
fixed-length binary genes to real values.  By reducing the length of
genes DPE causes the GA to focus its search on the interactions between
genes rather than the details of allele selection within individual
genes.  DPE also highlights the general importance of the problem of
premature convergence in GAs, explored here through two convergence
models.

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To obtain a hardcopy, request technical report LAUR 90-2795 via e-mail
from office%bromine at LANL.GOV, or via plain mail from

	Technical Report Requests
	CNLS, MS-B258
	Los Alamos National Laboratory
	Los Alamos, NM 87545
	USA

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As previously announced, the report is also available in compressed
PostScript format for anonymous ftp from the Artificial Life archive
server.  To obtain a copy, use the following procedure:

$ ftp iuvax.cs.indiana.edu   % (or 129.79.254.192)
login: anonymous
password: <anything>
ftp> cd pub/alife/papers
ftp> binary
ftp> get schrau90-dpe.ps.Z
ftp> quit
$ uncompress schrau90-dpe.ps.Z
$ lpr schrau90-dpe.ps

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The DPE algorithm is an option in the GENESIS 1.1ucsd GA simulator, which
will be ready for distribution (via anonymous ftp) shortly.  Procedures
for obtaining 1.1ucsd will then be announced on this mailing list.

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Nici Schraudolph, C-014                nschraudolph at ucsd.edu
University of California, San Diego    nschraudolph at ucsd.bitnet
La Jolla, CA 92093                     ...!ucsd!nschraudolph