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ECJ-INTEREST-L  September 2012

ECJ-INTEREST-L September 2012

Subject:

Trouble with strongly typed genetic programming

From:

Warren Henning <[log in to unmask]>

Reply-To:

ECJ Evolutionary Computation Toolkit <[log in to unmask]>

Date:

Wed, 19 Sep 2012 12:52:29 -0700

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (103 lines)

I'm trying to use strongly-typed Koza-style GP with two data types:
booleans and doubles. The terminals return doubles and the booleans
take the doubles and return true or false, which allows the formation
of comprehensible rules like "X > Y", assuming X and Y were terminals
returning doubles.

So my boolean functions are logical functions and comparison
functions. I want those at the top and the number-returning terminals
at the bottom of the individuals being created.

So I have node constraints in my params file that I wished to try to
achieve this (an excerpt follows):

gp.type.a.size = 2
gp.type.a.0.name = boolean
gp.type.a.1.name = nil

# IfElse

gp.nc.3 = ec.gp.GPNodeConstraints
gp.nc.3.name = booldoubledouble
gp.nc.3.returns = nil
gp.nc.3.size = 3
gp.nc.3.child.0 = boolean
gp.nc.3.child.1 = nil
gp.nc.3.child.2 = nil

# And, Or, Xor

gp.nc.4 = ec.gp.GPNodeConstraints
gp.nc.4.name = boolbool
gp.nc.4.returns = boolean
gp.nc.4.size = 2
gp.nc.4.child.0 = boolean
gp.nc.4.child.1 = boolean

etc.

Then my function set returns nil or boolean:

gp.fs.0.func.0 = ec.app.liarsevolution.main.functions.arithmetic.Sub
gp.fs.0.func.0.nc = nc2
gp.fs.0.func.1 = ec.app.liarsevolution.main.functions.arithmetic.Mul
gp.fs.0.func.1.nc = nc2
...
gp.fs.0.func.5 = ec.app.liarsevolution.main.functions.bool.And
gp.fs.0.func.5.nc = boolbool
...

But then when I run the Evolve class with this configuration file, I
get these warnings that I did not expect:


WARNING:
In function set f0 for the GPTreeConstraints tc0, no terminals are
given with the return type boolean which is required by other
functions in the function set or by the tree's return type.  Nearly
all tree-builders in ECJ require the ability to add a terminal of any
type for which there is a nonterminal, and at any time.  Without
terminals, your code may not work.  One common indication that a
tree-builder has failed due to this problem is if you get the
MersenneTwister error 'n must be positive'.
PARAMETER: gp.tc.0
WARNING:
In function set f0 for the GPTreeConstraints tc1, no terminals are
given with the return type boolean which is required by other
functions in the function set or by the tree's return type.  Nearly
all tree-builders in ECJ require the ability to add a terminal of any
type for which there is a nonterminal, and at any time.  Without
terminals, your code may not work.  One common indication that a
tree-builder has failed due to this problem is if you get the
MersenneTwister error 'n must be positive'.

(As you can see, each individual has two trees, both of which use the
same function set.) I figured it was acceptable to not have the
terminals return boolean, as they return doubles which the comparison
functions i have ("greater than", "less than", etc) take these doubles
and return a boolean, the way i want. The node constraint I have for
this is:

gp.nc.6 = ec.gp.GPNodeConstraints
gp.nc.6.name = comparison
gp.nc.6.returns = boolean
gp.nc.6.size = 2
gp.nc.6.child.0 = nil
gp.nc.6.child.1 = nil

Then the comparison functions are set up like so:

gp.fs.0.func.9 = ec.app.liarsevolution.main.functions.comparison.Equal
gp.fs.0.func.9.nc = comparison

My GPData class just has a double and a boolean variable. The
double-returning terminals set the double variable and the logical
functions set the boolean variable in my GPData-inheriting class. The
GP individual itself is ultimately meant to return a boolean (i.e., it
can be interpreted as a true/false rule).

I appreciate any help. Please let me know if I need to clarify/post
more information. Thank you!

Best regards,
Warren Henning

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