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February 2014

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Subject:
From:
Xiaomeng Ye <[log in to unmask]>
Reply To:
ECJ Evolutionary Computation Toolkit <[log in to unmask]>
Date:
Tue, 11 Feb 2014 14:00:03 -0500
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Hello everyone,

I am trying to integrate lambda-calculus into the GP package of ECJ.
Everything works just like any GPIndividual, GPTree, GPNode, except that
the LambdaTree can go through a process of reduction, which produces a
minimal form of the LambdaTree.
Because I used cloning and the tree could be potentially huge, I keep
getting this error:
java.lang.OutOfMemoryError: Java heap space

Even after extended the JVM heapsize to 1 GB, I can only avoid it by
setting extremely small population size like 20 (which produces nothing
interesting as the population is too small). Other than that, the program
runs out of memory at some point.

Has anyone play with the cloning? Is there any pitfall? How is Java Garbage
collection treating those nodes? (If they are treated just like any other
java object, I think I might exploit cloning wrongly)

Thanks a lot!

Ye Xiaomeng


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