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java.lang.Object | +--ec.gp.GPProblem
A GPProblem is a Problem which is meant to efficiently handle GP evaluation. GPProblems hold one ADFStack, which is used to evaluate a large number of trees without having to be garbage-collected and reallocated. Be sure to call stack.reset() after each tree evaluation.
Parameters
base.stack classname, inherits or = ec.ADFStack |
(the class for the GPProblem's ADF Stack) |
base.data classname, inherits and != ec.GPData |
(the class for the GPProblem's basic GPData type) |
Default Base
gp.problem
Parameter bases
base.stack | (stack) |
base.data | (data) |
Field Summary | |
GPData |
data
The GPProblems' GPData |
static java.lang.String |
P_DATA
|
static java.lang.String |
P_GPPROBLEM
|
static java.lang.String |
P_STACK
|
ADFStack |
stack
The GPProblem's stack |
Constructor Summary | |
GPProblem()
|
Method Summary | |
Parameter |
defaultBase()
GPProblem defines a default base so your subclass doesn't absolutely have to. |
void |
describe(Individual[] ind,
EvolutionState state,
int threadnum,
int log,
int verbosity)
"Reevaluates" a set of individuals together, for the purpose of printing out interesting facts about the individuals in the context of the Problem, and logs the results. |
java.lang.Object |
protoClone()
Creates a new individual cloned from a prototype, and suitable to begin use in its own evolutionary context. |
java.lang.Object |
protoCloneSimple()
This should be implemented in a the top-level Prototype ONLY; in fact, it should probably be declared final. |
void |
setup(EvolutionState state,
Parameter base)
Sets up the object by reading it from the parameters stored in state, built off of the parameter base base. |
Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
Field Detail |
public static final java.lang.String P_GPPROBLEM
public static final java.lang.String P_STACK
public static final java.lang.String P_DATA
public ADFStack stack
public GPData data
Constructor Detail |
public GPProblem()
Method Detail |
public Parameter defaultBase()
public void setup(EvolutionState state, Parameter base)
For prototypes, setup(...) is typically called once for the prototype instance; cloned instances do not receive the setup(...) call. setup(...) may be called more than once; the only guarantee is that it will get called at least once on an instance or some "parent" object from which it was ultimately cloned.
public java.lang.Object protoClone() throws java.lang.CloneNotSupportedException
The question here is whether or not this means to perform a "deep" or "light" ("shallow") clone, or something in-between. You may need to deep-clone parts of your object rather than simply copying their references, depending on the situation:
Implementations.
public Object protoClone() throws CloneNotSupportedException
{
return super.clone();
}
public Object protoClone() throws CloneNotSupportedException
{
myobj = (MyObject) (super.clone());
// put your deep-cloning code here...
// ...you should use protoClone and not
// protoCloneSimple to clone subordinate objects...
return myobj;
}
public Object protoClone() throws CloneNotSupportedException
{
MyObject myobj = (MyObject)(super.protoClone());
// put your deep-cloning code here...
// ...you should use protoClone and not
// protoCloneSimple to clone subordinate objects...
return myobj;
}
If you know that your superclasses will never change their protoClone() implementations, you might try inlining them in your overridden protoClone() method. But this is dangerous (though it yields a small net increase).
In general, you want to keep your deep cloning to an absolute minimum, so that you don't have to call protoClone() but one time.
The approach taken here is the fastest that I am aware of while still permitting objects to be specified at runtime from a parameter file. It would be faster to use the "new" operator; but that would require hard-coding that we can't do. Although using java.lang.Object.clone() entails an extra layer that deals with stripping away the "protected" keyword and also wrapping the exception handling (which is a BIG hit, about three times as slow as using "new"), it's still MUCH faster than using java.lang.Class.newInstance(), and also much faster than rolling our own Clone() method.
public final java.lang.Object protoCloneSimple()
public final Object protoCloneSimple()
{
try { return protoClone(); }
catch (CloneNotSupportedException e)
{ throw new InternalError(); } // never happens
}
public void describe(Individual[] ind, EvolutionState state, int threadnum, int log, int verbosity)
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