Thanks for keep on reading.
I have found what I was looking for on this thread: The "nil" GPType in GPNodeConstraints
. I am indeed trying to add the constraints that my model needs and I'm coming across some troubles.
Let me contextualize the problem. I'm generating a tree of AND and OR non-terminal nodes and a RULE-function as terminal nodes. I want to add some constrains so the generated tree follows this two rules:
1) The root of the tree must be an AND function.
2) At least one of the childs of the non-terminal nodes must be or a terminal-node (RULE) or an AND node.
I'm trying to add the described constrains like this:
First, I define the GPTypes as follows:
To fulfill 1) I added the follow tree constrain:
gp.tc.0.returns = and
To fulfill 2) I added the follow node constrains:
gp.nc.size = 10
gp.nc.7 = ec.gp.GPNodeConstraints
gp.nc.7.name = ncAND
gp.nc.7.returns = and
gp.nc.7.size = 2
gp.nc.7.child.0 = rule
gp.nc.7.child.1 = or
gp.nc.8 = ec.gp.GPNodeConstraints
gp.nc.8.name = ncRULE
gp.nc.8.returns = rule
gp.nc.8.size = 0
gp.nc.9 = ec.gp.GPNodeConstraints
gp.nc.9.name = ncOR
gp.nc.9.returns = or
gp.nc.9.size = 2
gp.nc.9.child.0 = rule
gp.nc.9.child.1 = and
Then I add each constrains to the functions of the function set:
Note that with this constrains I am being more restrictive that what I have defined in 2), and actually it doesn't work because, as it is obvious, it never finish due there is always a non-terminal node as child in gp.nc.8.child.1 and gp.nc.9.child.1. The problem here is that I need gp.nc.8.child.1 and gp.nc.9.child.1 to be some times AND and some others RULE, so the GP program will eventually finish.
And I will like to set gp.nc.8.child.0 and gp.nc.9.child.0 some times to RULE and some others to AND to fully satisfy 2)
Is there any way? How can I do such things.
Thanks in advance.
On Tue, Dec 15, 2009 at 10:08 AM, alibaba <[log in to unmask]>
First of all, thanks for reading.
I need to add
some Constraints to my GP program so each function that I have can only
accept a specific subset of children. For this, should specify this on
the params files or I have to add some checks on the checkConstraints
method for each GPNode.
Does anybody know an example on the web about this that I can follow?
Thanks in advance.