def xmut(ind, expr, unipb, shrpb, inspb, pset):
choice = random.random()
if choice < unipb:
indx1 = gp.mutUniform(ind[0], expr, pset=pset)
ind[0] = indx1[0]
indx2 = gp.mutUniform(ind[1], expr, pset=pset)
ind[1] = indx2[0]
elif unipb <= choice < unipb + shrpb:
indx1 = gp.mutShrink(ind[0])
ind[0] = indx1[0]
indx2 = gp.mutShrink(ind[1])
ind[1] = indx2[0]
elif unipb + shrpb <= choice < unipb + shrpb + inspb:
indx1 = gp.mutInsert(ind[0], pset=pset)
ind[0] = indx1[0]
indx2 = gp.mutInsert(ind[1], pset=pset)
ind[1] = indx2[0]
else:
choice2 = random.random()
if choice2 < 0.5:
indx1 = gp.mutEphemeral(ind[0], "all")
ind[0] = indx1[0]
indx2 = gp.mutEphemeral(ind[1], "all")
ind[1] = indx2[0]
else:
indx1 = gp.mutEphemeral(ind[0], "one")
ind[0] = indx1[0]
indx2 = gp.mutEphemeral(ind[1], "one")
ind[1] = indx2[0]
return ind,
def xmut(ind, expr, strp):
i1 = random.randrange(len(ind))
i2 = random.randrange(len(ind[i1]))
choice = random.random()
if choice < strp:
indx = gp.mutUniform(ind[i1], expr, pset=pset)
ind[i1] = indx[0]
return ind,
else:
'''this part execute the mutation on a random constant'''
indx = gp.mutEphemeral(ind[i1], "one")
ind[i1] = indx[0]
return ind,
def combined_mutation(individual, expr, pset):
if random.random() > 0.5:
return gp.mutInsert(individual, pset)
else:
return gp.mutEphemeral(individual, "one")
def xmut(ind, expr, unipb, shrpb, inspb, pset, creator):
"""
Author(s): Francesco Marchetti
email: [email protected]
From [1] and modified. Added several mutations possibilities.
"""
choice = random.random()
try:
if type(ind[0]) == creator.SubIndividual:
if hasattr(pset, '__len__'):
if choice < unipb:
indx1 = gp.mutUniform(ind[0], expr, pset=pset[0])
ind[0] = indx1[0]
indx2 = gp.mutUniform(ind[1], expr, pset=pset[1])
ind[1] = indx2[0]
elif unipb <= choice < unipb + shrpb:
indx1 = gp.mutShrink(ind[0])
ind[0] = indx1[0]
indx2 = gp.mutShrink(ind[1])
ind[1] = indx2[0]
elif unipb + shrpb <= choice < unipb + shrpb + inspb:
indx1 = gp.mutInsert(ind[0], pset=pset[0])
ind[0] = indx1[0]
indx2 = gp.mutInsert(ind[1], pset=pset[1])
ind[1] = indx2[0]
else:
choice2 = random.random()
if choice2 < 0.5:
indx1 = gp.mutEphemeral(ind[0], "all")
ind[0] = indx1[0]
indx2 = gp.mutEphemeral(ind[1], "all")
ind[1] = indx2[0]
else:
indx1 = gp.mutEphemeral(ind[0], "one")
ind[0] = indx1[0]
indx2 = gp.mutEphemeral(ind[1], "one")
ind[1] = indx2[0]
else:
if choice < unipb:
indx1 = gp.mutUniform(ind[0], expr, pset=pset)
ind[0] = indx1[0]
indx2 = gp.mutUniform(ind[1], expr, pset=pset)
ind[1] = indx2[0]
elif unipb <= choice < unipb + shrpb:
indx1 = gp.mutShrink(ind[0])
ind[0] = indx1[0]
indx2 = gp.mutShrink(ind[1])
ind[1] = indx2[0]
elif unipb + shrpb <= choice < unipb + shrpb + inspb:
indx1 = gp.mutInsert(ind[0], pset=pset)
ind[0] = indx1[0]
indx2 = gp.mutInsert(ind[1], pset=pset)
ind[1] = indx2[0]
else:
choice2 = random.random()
if choice2 < 0.5:
indx1 = gp.mutEphemeral(ind[0], "all")
ind[0] = indx1[0]
indx2 = gp.mutEphemeral(ind[1], "all")
ind[1] = indx2[0]
else:
indx1 = gp.mutEphemeral(ind[0], "one")
ind[0] = indx1[0]
indx2 = gp.mutEphemeral(ind[1], "one")
ind[1] = indx2[0]
except AttributeError:
if choice < unipb:
indx1 = gp.mutUniform(ind, expr, pset=pset)
ind = indx1[0]
elif unipb <= choice < unipb + shrpb:
indx1 = gp.mutShrink(ind)
ind = indx1[0]
elif unipb + shrpb <= choice < unipb + shrpb + inspb:
indx1 = gp.mutInsert(ind, pset=pset)
ind = indx1[0]
else:
choice2 = random.random()
if choice2 < 0.5:
indx1 = gp.mutEphemeral(ind, "all")
ind = indx1[0]
else:
indx1 = gp.mutEphemeral(ind, "one")
ind = indx1[0]
return ind,
def random_mutation(individual, expr, pset):
return random.choice([gp.mutShrink(individual), gp.mutNodeReplacement(individual, pset), gp.mutUniform(individual, expr, pset), gp.mutEphemeral(individual, "all")])