[eas_cs_seminars] Tuesday 7th March

[Luca Rossi]

Hi all,

This is just a reminder of tomorrow's seminar, which will take place as
usual from 2pm to 3pm in mb220 and will see Dr. William Langdon (
http://www0.cs.ucl.ac.uk/staff/W.Langdon/) giving a talk on "Long-Term
Evolution in Genetic Programming".

Best,
Luca

On 28 February 2017 at 11:59, Luca Rossi <l.rossi at aston.ac.uk> wrote:

> Dear all,
>
> Next Tuesday (07/03) Dr. William Langdon (http://www0.cs.ucl.ac.uk/staf
> f/W.Langdon/) will give a talk titled "Long-Term Evolution in Genetic
> Programming" in MB220 from 2pm to 3pm.
>
> Looking forward to seeing you there,
> Luca
>
> Abstract:
>
> We evolve 6-mux populations of genetic programming binary Boolean trees
> for up to 100,000 generations. As there is no bloat control, programs with
> more than a hundred million nodes may be created by crossover. These are by
> far the largest programs yet evolved. Our unbounded Long-Term Evolution
> Experiment LTEE GP appears not to evolve building blocks but does suggests
> a limit to bloat.
>
> We do see periods of tens even hundreds of generations where the whole
> population is functionally converged. In contrast to wetware LTEE
> experiments with bacteria (genome 4.6 million base pairs in length and
> 66000 generations), we do not see continual innovation, but instead
> although each tree in the population may be different, they all have the
> same phenotype (in that they can all solve the multiplexor benchmark) and
> the code next to the tree's root becomes highly stable.
>
> We test theory about the distribution of tree sizes. Surprisingly in real
> finite populations with typical GP tournament selection we do see
> deviations from crossover only theoretical predictions.
>
> --
> Luca Rossi
>
> Lecturer in Computer Science
> School of Engineering and Applied Science
> Aston University
> Web: http://www.cs.aston.ac.uk/~rossil/
> <http://www.cs.bham.ac.uk/~rossil/>
>



-- 
Luca Rossi

Lecturer in Computer Science
School of Engineering and Applied Science
Aston University
Web: http://www.cs.aston.ac.uk/~rossil/ <http://www.cs.bham.ac.uk/~rossil/>
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