def __init__(self, **kwargs):
super(Boa, self).__init__(**kwargs)
self.network = BayesNet(numVariables=self.config.space.dim,
**self.config.__properties__)
self.network = StructureProposal(**self.config.__properties__).search(
self.network)
self.trained = False
def update(self, history, fitness):
super(Boa, self).update(history,fitness)
if history.lastPopulation() is None:
return
population = [x for x,s in history.lastPopulation()]
selected = int(self.config.truncate * len(population))
self.network = BayesNet(numVariables=self.config.space.dim,
**self.config.__properties__)
self.network.config.data = None
self.network = StructureProposal(**self.network.config.__properties__).search(self.network)
self.network.config.data = population
self.network.structureSearch(population)
self.network.update(self.history.updates, population)
def update(self, history, fitness):
super(Boa, self).update(history, fitness)
if history.lastPopulation() is None:
return
population = [x for x, s in history.lastPopulation()]
selected = int(self.config.truncate * len(population))
self.network = BayesNet(numVariables=self.config.space.dim,
**self.config.__properties__)
self.network.config.data = None
self.network = StructureProposal(
**self.network.config.__properties__).search(self.network)
self.network.config.data = population
self.network.structureSearch(population)
self.network.update(self.history.updates, population)
def parse(self, fname):
f = open(fname)
totalLine = ""
done = False
for line in f:
totalLine += line
lefts = len(totalLine.split("("))
rights = len(totalLine.split(")"))
if lefts == rights:
self.processLine(totalLine)
totalLine = ""
categories = [[]] * self.index
for name, idx in self.indexMap.iteritems():
categories[idx] = self.variables[name]['vals']
cfg = Config()
cfg.numVariables = len(self.variables)
cfg.variableGenerator = MultinomialVariableGenerator(categories)
cfg.randomizer = MultinomialRandomizer()
cfg.sampler = DAGSampler()
cfg.structureGenerator = StructureProposal(cfg)
net = BayesNet(cfg)
for variable in net.variables:
variable.tables = self.variables[self.revIndexMap[
variable.index]]['cpt']
#print names[variable.index], self.variables[self.revIndexMap[variable.index]]['parents']
variable.known = [
self.indexMap[parent] for parent in self.variables[
self.revIndexMap[variable.index]]['parents']
]
variable.known = sorted(variable.known)
variable.parents = dict([(i, net.variables[i])
for i in variable.known])
net.dirty = True
net.computeEdgeStatistics()
"""
for variable in net.variables:
print "(var ", self.revIndexMap[variable.index], " (", " ".join(variable.categories[variable.index]), "))"
for variable in net.variables:
print "(parents ", self.revIndexMap[variable.index], " (", " ".join([self.revIndexMap[i] for i in variable.known]), ") "
for key, val in variable.tables.iteritems():
if key == "":
expanded = ""
else:
cfg = array([int(num) for num in key.split(",")])
expanded = " ".join(self.variables[self.revIndexMap[variable.known[k]]]['vals'][c-1] for k,c in enumerate(cfg))
total = val.sum()
vals = " ".join([str(i) for i in val])
print "((", expanded, ") ", vals, (1. - total), ")"
print ")"
"""
return net
def __init__(self, space):
self.space = space
self.sampler = DAGSampler()
if hasattr(space, 'dim'):
self.numVariables = space.dim
else:
raise ValueError("Cannot determine the number of dimensions "
"for BinaryBayesStructure space based on given "
"space; expected space to have property dim "
"indicating the number of required variables. ")
super(BinaryBayesStructure, self).__init__(self.numVariables**2)
self.config = Config(numVariables=self.numVariables,
variableGenerator=self.variable,
randomizer=self.randomize,
sampler=self.sample)
self.proposal = StructureProposal(**self.config.__properties__)
self.config.structureGenerator = self.proposal
class Boa(PopulationDistribution):
"""The Bayesian Optimization Algorithm of Martin Pelikan. """
config = Config(
variableGenerator=BinaryVariable,
branchFactor=3,
structureGenerator=GreedyStructureSearch(
3, BayesianInformationCriterion()),
randomizer=lambda net: TernaryString(0L, -1L, net.numVariables),
sampler=DAGSampler(),
data=None,
truncate=0.60, # percentage of the population to keep
space=BinaryReal(realDim=5),
history=SortedMarkovHistory)
def __init__(self, **kwargs):
super(Boa, self).__init__(**kwargs)
self.network = BayesNet(numVariables=self.config.space.dim,
**self.config.__properties__)
self.network = StructureProposal(**self.config.__properties__).search(
self.network)
self.trained = False
def compatible(self, history):
return hasattr(history, "lastPopulation") and history.sorted
def sample(self):
x = self.network.__call__()
cnt = 0
while not self.config.space.in_bounds(x):
if cnt > 10000:
raise ValueError(
"Rejection sampling failed after 10,000 attempts in BOA")
x = self.network.__call__()
cnt += 1
return x
def batch(self, num):
return [self.sample() for i in xrange(num)]
def update(self, history, fitness):
super(Boa, self).update(history, fitness)
if history.lastPopulation() is None:
return
population = [x for x, s in history.lastPopulation()]
selected = int(self.config.truncate * len(population))
self.network = BayesNet(numVariables=self.config.space.dim,
**self.config.__properties__)
self.network.config.data = None
self.network = StructureProposal(
**self.network.config.__properties__).search(self.network)
self.network.config.data = population
self.network.structureSearch(population)
self.network.update(self.history.updates, population)
def __init__(self, space):
self.space = space
self.sampler = DAGSampler()
if hasattr(space, 'dim'):
self.numVariables = space.dim
else:
raise ValueError("Cannot determine the number of dimensions "
"for BinaryBayesStructure space based on given "
"space; expected space to have property dim "
"indicating the number of required variables. ")
super(BinaryBayesStructure, self).__init__(self.numVariables**2)
self.config = Config(numVariables=self.numVariables,
variableGenerator=self.variable,
randomizer=self.randomize,
sampler=self.sample)
self.proposal = StructureProposal(**self.config.__properties__)
self.config.structureGenerator = self.proposal
class Boa(PopulationDistribution):
"""The Bayesian Optimization Algorithm of Martin Pelikan. """
config = Config(variableGenerator=BinaryVariable,
branchFactor=3,
structureGenerator=GreedyStructureSearch(3, BayesianInformationCriterion()),
randomizer = lambda net: TernaryString(0L, -1L, net.numVariables),
sampler = DAGSampler(),
data = None,
truncate = 0.60, # percentage of the population to keep
space = BinaryReal(realDim=5),
history=SortedMarkovHistory)
def __init__(self, **kwargs):
super(Boa, self).__init__(**kwargs)
self.network = BayesNet(numVariables=self.config.space.dim,
**self.config.__properties__)
self.network = StructureProposal(**self.config.__properties__).search(self.network)
self.trained = False
def compatible(self, history):
return hasattr(history, "lastPopulation") and history.sorted
def sample(self):
x = self.network.__call__()
cnt = 0
while not self.config.space.in_bounds(x):
if cnt > 10000:
raise ValueError("Rejection sampling failed after 10,000 attempts in BOA")
x = self.network.__call__()
cnt += 1
return x
def batch(self, num):
return [self.sample() for i in xrange(num)]
def update(self, history, fitness):
super(Boa, self).update(history,fitness)
if history.lastPopulation() is None:
return
population = [x for x,s in history.lastPopulation()]
selected = int(self.config.truncate * len(population))
self.network = BayesNet(numVariables=self.config.space.dim,
**self.config.__properties__)
self.network.config.data = None
self.network = StructureProposal(**self.network.config.__properties__).search(self.network)
self.network.config.data = population
self.network.structureSearch(population)
self.network.update(self.history.updates, population)
class BayesNetStructure(Space, PreBayesSpace):
"""Space for Bayesian network structure search.
Built on top of a variable space that determines the variables of the
Bayes net. For example, a Euclidean space, say $\mathbb{R}^d$, would have
$d$ :class:`GaussianVariable`s. Or, a Binary space would have
:class:`BinaryVariable`s.
The default choice of variable is controlled by the ``_mapping`` class
variable based on the ``type`` field of the variable space. To have mixed
networks, use a :class:`Product` space.
:param space: The space of variables
:type space: :class:`Space`
"""
_mappings = { # map space types to bayesian variables
np.ndarray: GaussianVariable,
TernaryString: BinaryVariable,
}
def __init__(self, space):
super(BayesNetStructure, self).__init__(BayesNet)
self.space = space
self.sampler = DAGSampler()
if hasattr(space, 'dim'):
self.numVariables = space.dim
else:
raise ValueError("Cannot determine the number of dimensions "
"for BayesNetStructure space based on given "
"space; expected space to have property dim "
"indicating the number of required variables. ")
self.config = Config(numVariables=self.numVariables,
variableGenerator=self.variable,
randomizer=self.randomize,
sampler=self.sample)
self.proposal = StructureProposal(**self.config.__properties__)
self.config.structureGenerator = self.proposal
self.edges = []
self.nedges = []
def in_bounds(self, network, **kwargs):
c = network.config
return (isinstance(network, BayesNet)
and len(network.variables) == self.numVariables and np.all([
v.__class__ == self.variable(v.index, c).__class__
for v in network.variables
]))
def proportion(self, smaller, larger, index):
return 2.0**((len(smaller.edges) + len(smaller.nedges)) -
(len(larger.edges) + len(larger.nedges)))
def area(self, **kwargs):
return 1.0
def random(self):
network = BayesNet(**self.config.__properties__)
for i in xrange(5):
self.proposal.search(network)
return network
def extent(self):
return self.nedges, self.edges
#raise NotImplementedError("Bayesian networks do not have a "
# "well-defined notion of spatial extent; "
# "If you have something in mind, please "
# "subclass the space or submit a pull "
# "request.")
def hash(self, point):
point.computeEdgeStatistics()
return str(point.edges)
class BinaryBayesStructure(Binary, PreBayesSpace):
"""A binary genotype with a Bayesian network structure phenotype.
Bits indicate the presence or absence of an edge.
Built on top of a variable space that determines the variables of the
Bayes net. For example, a Euclidean space, say $\mathbb{R}^d$, would have
$d$ :class:`GaussianVariable`s. Or, a Binary space would have
:class:`BinaryVariable`s.
The default choice of variable is controlled by the ``_mapping`` class
variable based on the ``type`` field of the variable space. To have mixed
networks, use a :class:`Product` space.
:param space: The space of variables
:type space: :class:`Space`
"""
_mappings = { # map space types to bayesian variables
np.ndarray: GaussianVariable,
TernaryString: BinaryVariable,
}
def __init__(self, space):
self.space = space
self.sampler = DAGSampler()
if hasattr(space, 'dim'):
self.numVariables = space.dim
else:
raise ValueError("Cannot determine the number of dimensions "
"for BinaryBayesStructure space based on given "
"space; expected space to have property dim "
"indicating the number of required variables. ")
super(BinaryBayesStructure, self).__init__(self.numVariables**2)
self.config = Config(numVariables=self.numVariables,
variableGenerator=self.variable,
randomizer=self.randomize,
sampler=self.sample)
self.proposal = StructureProposal(**self.config.__properties__)
self.config.structureGenerator = self.proposal
def convert(self, x):
if not isinstance(x, self.type):
cname = self.__class__.__name__
raise ValueError("Type mismatch in {0}.convert".format(cname))
try:
net = BayesNet(**self.config.__properties__)
edges = []
indexMap = {}
for var in net.variables:
indexMap[var.index] = var
self.proposal.network = net
for i in xrange(x.length):
if x[i]:
frm, to = i % self.numVariables, i // self.numVariables
child = indexMap[frm]
parent = indexMap[to]
try:
self.proposal.addEdge(child, parent, self.config.data)
except CyclicException:
pass
self.proposal.network = None
return net
except Exception:
traceback.print_exc()
raise ValueError("Unable to convert point due to exception")
class BayesNetStructure(Space, PreBayesSpace):
"""Space for Bayesian network structure search.
Built on top of a variable space that determines the variables of the
Bayes net. For example, a Euclidean space, say $\mathbb{R}^d$, would have
$d$ :class:`GaussianVariable`s. Or, a Binary space would have
:class:`BinaryVariable`s.
The default choice of variable is controlled by the ``_mapping`` class
variable based on the ``type`` field of the variable space. To have mixed
networks, use a :class:`Product` space.
:param space: The space of variables
:type space: :class:`Space`
"""
_mappings = { # map space types to bayesian variables
np.ndarray: GaussianVariable,
TernaryString: BinaryVariable,
}
def __init__(self, space):
super(BayesNetStructure, self).__init__(BayesNet)
self.space = space
self.sampler = DAGSampler()
if hasattr(space, 'dim'):
self.numVariables = space.dim
else:
raise ValueError("Cannot determine the number of dimensions "
"for BayesNetStructure space based on given "
"space; expected space to have property dim "
"indicating the number of required variables. ")
self.config = Config(numVariables=self.numVariables,
variableGenerator=self.variable,
randomizer=self.randomize,
sampler=self.sample)
self.proposal = StructureProposal(**self.config.__properties__)
self.config.structureGenerator = self.proposal
self.edges = []
self.nedges = []
def in_bounds(self, network, **kwargs):
c = network.config
return (isinstance(network, BayesNet) and
len(network.variables) == self.numVariables and
np.all([v.__class__ == self.variable(v.index,c).__class__
for v in network.variables]))
def proportion(self, smaller, larger, index):
return 2.0 ** ((len(smaller.edges) + len(smaller.nedges)) -
(len(larger.edges) + len(larger.nedges)))
def area(self, **kwargs):
return 1.0
def random(self):
network = BayesNet(**self.config.__properties__)
for i in xrange(5):
self.proposal.search(network)
return network
def extent(self):
return self.nedges, self.edges
#raise NotImplementedError("Bayesian networks do not have a "
# "well-defined notion of spatial extent; "
# "If you have something in mind, please "
# "subclass the space or submit a pull "
# "request.")
def hash(self, point):
point.computeEdgeStatistics()
return str(point.edges)
class BinaryBayesStructure(Binary, PreBayesSpace):
"""A binary genotype with a Bayesian network structure phenotype.
Bits indicate the presence or absence of an edge.
Built on top of a variable space that determines the variables of the
Bayes net. For example, a Euclidean space, say $\mathbb{R}^d$, would have
$d$ :class:`GaussianVariable`s. Or, a Binary space would have
:class:`BinaryVariable`s.
The default choice of variable is controlled by the ``_mapping`` class
variable based on the ``type`` field of the variable space. To have mixed
networks, use a :class:`Product` space.
:param space: The space of variables
:type space: :class:`Space`
"""
_mappings = { # map space types to bayesian variables
np.ndarray: GaussianVariable,
TernaryString: BinaryVariable,
}
def __init__(self, space):
self.space = space
self.sampler = DAGSampler()
if hasattr(space, 'dim'):
self.numVariables = space.dim
else:
raise ValueError("Cannot determine the number of dimensions "
"for BinaryBayesStructure space based on given "
"space; expected space to have property dim "
"indicating the number of required variables. ")
super(BinaryBayesStructure, self).__init__(self.numVariables**2)
self.config = Config(numVariables=self.numVariables,
variableGenerator=self.variable,
randomizer=self.randomize,
sampler=self.sample)
self.proposal = StructureProposal(**self.config.__properties__)
self.config.structureGenerator = self.proposal
def convert(self, x):
if not isinstance(x, self.type):
cname = self.__class__.__name__
raise ValueError("Type mismatch in {0}.convert".format(cname))
try:
net = BayesNet(**self.config.__properties__)
edges = []
indexMap = {}
for var in net.variables:
indexMap[var.index] = var
self.proposal.network = net
for i in xrange(x.length):
if x[i]:
frm, to = i % self.numVariables, i // self.numVariables
child = indexMap[frm]
parent = indexMap[to]
try:
self.proposal.addEdge(child, parent, self.config.data)
except CyclicException:
pass
self.proposal.network = None
return net
except Exception:
traceback.print_exc()
raise ValueError("Unable to convert point due to exception")
def __init__(self, **kwargs):
super(Boa, self).__init__(**kwargs)
self.network = BayesNet(numVariables=self.config.space.dim,
**self.config.__properties__)
self.network = StructureProposal(**self.config.__properties__).search(self.network)
self.trained = False
