DEAP example of logbook merging

merging_logbooks.py

import numpy

from deap import tools

logbook1 = tools.Logbook()
logbook2 = tools.Logbook()
logbook3 = tools.Logbook()

# Filling the logbooks [...]

logbook_list = [logbook1, logbook2, logbook3]

# Resulting logbook
aggregate = tools.Logbook()

# We identify the fields we want to merge or aggregate
fields = ['avg', 'min', 'max']

# We suppose every logbook as the same number of entries
nentry = len(logbook1)

for i in range(nentry):
    record = {}
    for field in fields:
        record[field] = numpy.mean([logbook[i][field] for logbook in logbook_list])
    aggregate.record(**record)