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Last change
on this file since 1185 was
1185,
checked in by Maciej Komosinski, 18 months ago
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Renamed a module; new name is "evolalg_steps"
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File size:
752 bytes
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| Line | |
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| 1 | from evolalg_steps.selection.selection import Selection |
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| 2 | from deap import tools |
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| 3 | import copy |
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| 4 | |
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| 5 | |
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| 6 | class NSGA2Selection(Selection): |
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| 7 | def __init__(self, copy=False, *args, **kwargs): |
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| 8 | super(NSGA2Selection, self).__init__(*args, **kwargs, copy=copy) |
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| 9 | |
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| 10 | def call(self, population, count=None): |
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| 11 | super(NSGA2Selection, self).call(population) |
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| 12 | pop = tools.selNSGA2(population, len(population)) |
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| 13 | # make count divisible by 4, required by deap.tools.selTournamentDCD() |
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| 14 | remainder=count % 4 |
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| 15 | if remainder > 0: |
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| 16 | count += 4-remainder |
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| 17 | return copy.deepcopy(tools.selTournamentDCD(pop, count)) # "The individuals sequence length has to be a multiple of 4 only if k is equal to the length of individuals" |
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