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Presentation dropbox
1.
Using Free Cloud
Storage Services For Distributed Evolutionary Algorithms Maribel García-Arenas, Juan-J. Merelo, Antonio M. Mora, Pedro Castillo
2.
3.
Dropbox features
4.
Putting in practice
with Evolutionary Computation
5.
File-individuals
6.
Island Algorithm
7.
Goals
8.
Problems
9.
Results
10.
11.
Why not use
them for computing?
12.
13.
Portable computer
14.
Home computer
15.
Any other computers...
16.
17.
After that, We
have selected Dropbox
18.
19.
It is popular
, so many people use it, and we may found many volunteers for computation
20.
It monitors
the local filesystem and uploads information asynchronously
21.
It looks like
a local directory
22.
23.
24.
It synchronizes
the file-individuals with other computers
25.
Each computer
evolves an island
26.
Dropbox folder contains
a pool of individuals and each computer adds and gets file-individuals from it
27.
28.
Each Island-computer evolves
a population of individuals and exchanges with the pool file-individuals when the migration process must be done
29.
30.
Into the filesystem
attributes ? Dropbox is working on that and we will be testing in the future
31.
Into the
filename ? It is our approach
32.
33.
We have to
code the genotype into base 32
34.
35.
36.
37.
Evaluate
38.
Generational replacement
with 1-elitism
39.
After a fixed
number of generations, Immigrate (gets one file-individual from the pool and incorporates it to the population)
40.
41.
42.
Each computer looks
for this kind of file within the Dropbox folder and adds the total of evaluations.
43.
When the sum
of this evaluations is greater than the fixed minimum, the evolution of this island ends.
44.
45.
46.
It is composed
of k (k=80) subproblems of 6 bits each one called s i for i=0 to 79 .
47.
Depending of the
number of ones s i takes the values detailed into the table ones fitness 0 or 6 1 5 or 1 0 2 or 4 0,360384 3 0,640576
48.
49.
For our problem,
the trap is defined for l=4, a=3, b=4 and z = 3
50.
With 30 traps
51.
into the genome
{
52.
53.
Population size: 1000
individuals
54.
Selection: Tournament
55.
Crossover: uniform
56.
Mutation: bit-flit
57.
Replacement: Generational with
1-elitism
58.
Stop criteria: minimum
number of evaluations for the multi-computer
59.
WiFi with WPA/Enterprise
encryption.
60.
Results for MMDP
61.
Results for TRAP
62.
63.
With this approach
everyone can use a multicomputer running an evolutionary algorithm with a good scaling behavior.
64.
Others results for
MMDP
65.
Questions
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