class TimeSampling:
timeout = 600.0
def setup(self):
self.model = get_example_model('alarm')
self.s = BayesianModelSampling(self.model)
def time_forward_sample(self):
self.model.simulate(n_samples=int(1e4), show_progress=False)
def time_rejection_sample(self):
self.model.simulate(n_samples=int(1e4),
evidence={
"HISTORY": "TRUE",
"HR": "NORMAL"
},
show_progress=False)
def time_likelihood_sample(self):
self.s.likelihood_weighted_sample(evidence=[("HISTORY", "TRUE"),
("HR", "NORMAL")],
size=int(1e4))
def time_gibbs_sampling(self):
gibbs_samples = GibbsSampling(model=self.model)
gibbs_sampling.sample(size=int(1e4))
def sampling(model, n=1000, verbose=3):
'''
Parameters
----------
model: [DICT] Contains model and adjmat
n: [INT] Number of samples to generate
n=1000 (default)
verbose: [INT] Print messages to screen.
0: NONE
1: ERROR
2: WARNING
3: INFO (default)
4: DEBUG
5: TRACE
Returns
-------
Pandas DataFrame
'''
assert n > 0, 'n must be 1 or larger'
assert 'BayesianModel' in str(
type(model['model'])
), 'Model must contain DAG from BayesianModel. Note that <misarables> example does not include DAG.'
# http://pgmpy.org/sampling.html
inference = BayesianModelSampling(model['model'])
# inference = GibbsSampling(model)
# Forward sampling and make dataframe
df = inference.forward_sample(size=n, return_type='dataframe')
return (df)
def __init__(self, parameters=None):
super().__init__(parameters)
# set up the network based on the parameters
self.model = DBN()
self.model.add_nodes_from(self.parameters['nodes'])
self.model.add_edges_from(self.parameters['edges'])
print(f'EDGES: {sorted(self.model.edges())}')
import ipdb
ipdb.set_trace()
# TODO -- add 'evidence' -- get from network?
cpds = (TabularCPD(variable=node_id,
variable_card=len(values),
values=values,
evidence=[]) for node_id, values in
self.parameters['conditional_probabilities'])
self.model.add_cpds(cpds)
# make an inference instance for sampling the model
self.inference = BayesianModelSampling(self.model)
# get a sample
sample = self.inference.forward_sample(size=2)
def generate_datasets(networks, folder, nb_samples=2000):
for network in networks:
dataset_out_path = os.path.join(folder, 'datasets', network + '.csv')
inference = BayesianModelSampling(networks[network])
samples = inference.forward_sample(size=nb_samples)
samples.to_csv(dataset_out_path)
def generate_time_series(
sampler: BayesianModelSampling,
length: int,
labels: typing.List[str],
seed: int = 42,
):
# Initialize progress bar
pbar = notebook.tqdm(total=length)
# Generate first sample given no evidence
with io.capture_output() as captured:
# When no evidence is provided, the function under-the-hood performs forward sampling
sample = sampler.rejection_sample(seed=seed)
sample = sample.reindex(sorted(sample.columns), axis=1)
# Split sample in 'current' and 'next' slices:
# - the 'current' slice will be the first row of the generated time series
# - the 'next' slice is added as the second row, and will be used as
# evidence for subsequent predictions
df_synth = sample.filter(regex="_T$")
next_slice = sample.filter(regex="_T\+1").iloc[0].values.tolist()
df_synth = df_synth.append(pd.Series(next_slice, index=df_synth.columns),
ignore_index=True)
evidence = [
State(n, v) for n, v in zip(df_synth.columns.values, next_slice)
]
# Update progress bar
pbar.update(2)
for _ in range(2, length):
# Generate new data
with io.capture_output() as captured:
sample = sampler.rejection_sample(evidence=evidence)
sample = sample.reindex(sorted(sample.columns), axis=1)
# Append 'next' slice to the generated time series, and use it as new evidence
next_slice = sample.filter(regex="_T\+1").iloc[0].values.tolist()
df_synth = df_synth.append(pd.Series(next_slice,
index=df_synth.columns),
ignore_index=True)
evidence = [
State(n, v) for n, v in zip(df_synth.columns.values, next_slice)
]
# Update progress bar
pbar.update(1)
# Close progress bar
pbar.close()
# Update column names
df_synth.columns = labels
return df_synth
def sample(self, nb_sample=1):
# sampling of pgmpy samples the index of the values
# Here we convert back this index to the actual value
def convert(samples):
for col in samples.columns:
_, states = self.get_state_space(col)
samples[col] = samples[col].apply(lambda x: states[x])
return samples
inference = BayesianModelSampling(self.bn)
samples = inference.forward_sample(size=nb_sample)
return convert(samples)
def __init__(self, model, actions, py_func):
""" model is a pgmpy.BayesianModel
actions is a list of (var,value) tuples """
self.py_func = py_func
self.parents = sorted(model.get_parents('Y'))
self.N = len(self.parents)
self.actions = actions
self.K = len(actions)
self.observational_model = model
self.observational_inference = VariableElimination(
self.observational_model)
self.post_action_models = [
GeneralModel.do(model, action) for action in actions
]
self.samplers = [
BayesianModelSampling(model_a)
for model_a in self.post_action_models
]
self.interventional_distributions = []
for indx, new_model in enumerate(self.post_action_models):
infer = VariableElimination(new_model)
_, distribution_over_parents = infer.query(self.parents)
self.interventional_distributions.append(distribution_over_parents)
self.pre_compute()
def infer(self, evidence, new_evidence):
evidence.update(new_evidence)
new_model, additional_evidence = self.reduce_model(evidence)
try:
if self.inference_type == InferenceType.BeliefPropagation:
inference = BeliefPropagation(new_model)
elif self.inference_type == InferenceType.GibbsSampling:
inference = GibbsSampling(new_model)
elif self.inference_type == InferenceType.BayesianModelSampler:
inference = BayesianModelSampling(new_model)
except Exception as e:
# for factor in new_model.factors:
# print(factor)
raise e
self.evidence = {
var: val
for (var, val) in evidence.items() if "F(" not in var
}
self.evidence.update(additional_evidence)
self.inference = inference
self.scope = get_scope(new_model)
return new_model
def sample(self, n_samples=1) :
"""
Sample n data points from the Bayesian Network
:param n_samples: int, amount of datapoints to generate.
:return: Dataframe of new datapoints shape (n_samples,n_features)
"""
np.random.seed(self.random_state)
inference = BayesianModelSampling(self.model)
Y = inference.forward_sample(size=n_samples, return_type='dataframe')
Y = Y[sorted(Y.columns)]
return Y[cols]
def setUp(self):
self.bayesian_model = BayesianModel([('A', 'J'), ('R', 'J'),
('J', 'Q'), ('J', 'L'),
('G', 'L')])
cpd_a = TabularCPD('A', 2, [[0.2], [0.8]])
cpd_r = TabularCPD('R', 2, [[0.4], [0.6]])
cpd_j = TabularCPD('J', 2,
[[0.9, 0.6, 0.7, 0.1], [0.1, 0.4, 0.3, 0.9]],
['R', 'A'], [2, 2])
cpd_q = TabularCPD('Q', 2, [[0.9, 0.2], [0.1, 0.8]], ['J'], [2])
cpd_l = TabularCPD('L', 2,
[[0.9, 0.45, 0.8, 0.1], [0.1, 0.55, 0.2, 0.9]],
['G', 'J'], [2, 2])
cpd_g = TabularCPD('G', 2, [[0.6], [0.4]])
self.bayesian_model.add_cpds(cpd_a, cpd_g, cpd_j, cpd_l, cpd_q, cpd_r)
self.sampling_inference = BayesianModelSampling(self.bayesian_model)
self.markov_model = MarkovModel()
def setUp(self):
self.bayesian_model = BayesianModel([("A", "J"), ("R", "J"),
("J", "Q"), ("J", "L"),
("G", "L")])
cpd_a = TabularCPD("A", 2, [[0.2], [0.8]])
cpd_r = TabularCPD("R", 2, [[0.4], [0.6]])
cpd_j = TabularCPD("J", 2,
[[0.9, 0.6, 0.7, 0.1], [0.1, 0.4, 0.3, 0.9]],
["R", "A"], [2, 2])
cpd_q = TabularCPD("Q", 2, [[0.9, 0.2], [0.1, 0.8]], ["J"], [2])
cpd_l = TabularCPD("L", 2,
[[0.9, 0.45, 0.8, 0.1], [0.1, 0.55, 0.2, 0.9]],
["G", "J"], [2, 2])
cpd_g = TabularCPD("G", 2, [[0.6], [0.4]])
self.bayesian_model.add_cpds(cpd_a, cpd_g, cpd_j, cpd_l, cpd_q, cpd_r)
self.sampling_inference = BayesianModelSampling(self.bayesian_model)
self.markov_model = MarkovModel()
def rejection_estimate(n):
inferences = BayesianModelSampling(disease_model)
evidences = [
State(var='Fatigue', state=0),
State(var='Fever', state=0),
State(var='FluShot', state=0)
]
p = inferences.rejection_sample(evidences, n)
i = 0
for t in range(n):
if p['Flu'][t] == float(0):
i = i + 1
plt.plot(t, (i / n), 'bo')
plt.ylabel('Evolving esimate')
plt.xlabel('Number of samples')
plt.show()
def getDataset(self, size=1000, return_type='DataFrame'):
"""
Method: retrun a set of samples generated from Bayesian Network. (Simply using forward-sampling)
Parameters
----------
size: size of the dataset to be generated (default: 1000)
return_type: return type of dataset (default: panda.DataFrame)
"""
# For more info, see: likelihood_weighted, rejection or Gibb sampling
from pgmpy.sampling import BayesianModelSampling
inference = BayesianModelSampling(self.__covid_model)
dataset = inference.forward_sample(size=size, return_type=return_type)
return dataset
def sampling(DAG, n=1000, verbose=3):
"""Generate sample(s) using forward sampling from joint distribution of the bayesian network.
Parameters
----------
DAG : dict
Contains model and adjmat of the DAG.
n : int, optional
Number of samples to generate. The default is 1000.
verbose : int, optional
Print progress to screen. The default is 3.
0: None, 1: ERROR, 2: WARN, 3: INFO (default), 4: DEBUG, 5: TRACE
Returns
-------
df : pd.DataFrame().
Dataframe containing sampled data from the input DAG model.
Example
-------
>>> import bnlearn
>>> DAG = bnlearn.import_DAG('sprinkler')
>>> df = bnlearn.sampling(DAG, n=1000)
"""
if n <= 0: raise ValueError('n must be 1 or larger')
if 'BayesianModel' not in str(type(DAG['model'])):
raise ValueError('DAG must contain BayesianModel.')
if verbose >= 3:
print('[bnlearn] >Forward sampling for %.0d samples..' % (n))
if len(DAG['model'].get_cpds()) == 0:
print(
'[bnlearn] >This seems like a DAG containing only edges, and no CPDs. Tip: use bn.parameter_learning.fit(DAG, df) to learn the CPDs first.'
)
return
# http://pgmpy.org/sampling.html
infer_model = BayesianModelSampling(DAG['model'])
# inference = GibbsSampling(model['model'])
# Forward sampling and make dataframe
df = infer_model.forward_sample(size=n, return_type='dataframe')
return (df)
def sample(N):
bn_generate = BayesianModel([('D', 'G'), ('I', 'G'), ('E', 'L'),
('G', 'L')])
cpd_d = TabularCPD('D', 2, [[0.6], [0.4]])
cpd_i = TabularCPD('I', 2, [[0.7], [0.3]])
cpd_g = TabularCPD('G', 3, [[0.3, 0.9, 0.05, 0.5], [0.4, 0.08, 0.25, 0.3],
[0.3, 0.02, 0.7, 0.2]], ['D', 'I'], [2, 2])
cpd_e = TabularCPD('E', 2, [[0.5], [0.5]])
cpd_l = TabularCPD(
'L', 2,
[[0.1, 0.3, 0.4, 0.25, 0.8, 0.99], [0.9, 0.7, 0.6, 0.75, 0.2, 0.01]],
['G', 'E'], [3, 2])
bn_generate.add_cpds(cpd_d, cpd_i, cpd_g, cpd_e, cpd_l)
infer = BayesianModelSampling(bn_generate)
data = infer.forward_sample(N)
return data, bn_generate
def sampling(model, n=1000, verbose=3):
"""Sample based on DAG.
Parameters
----------
model : dict
Contains model and adjmat.
n : int, optional
Number of samples to generate. The default is 1000.
verbose : int, optional
Print progress to screen. The default is 3.
0: NONE
1: ERROR
2: WARNING
3: INFO (default)
4: DEBUG
5: TRACE
Returns
-------
df : pd.DataFrame().
Example
-------
>>> import bnlearn
>>> model = bnlearn.import_DAG('sprinkler')
>>> df = bnlearn.sampling(model, n=1000)
"""
assert n > 0, 'n must be 1 or larger'
assert 'BayesianModel' in str(
type(model['model'])
), 'Model must contain DAG from BayesianModel. Note that <misarables> example does not include DAG.'
if verbose >= 3:
print('[BNLEARN][sampling] Forward sampling for %.0d samples..' % (n))
# http://pgmpy.org/sampling.html
inference = BayesianModelSampling(model['model'])
# inference = GibbsSampling(model)
# Forward sampling and make dataframe
df = inference.forward_sample(size=n, return_type='dataframe')
return (df)
def sample_slots(model_info_file, mr_slot_names):
model_info = helpers.load_from_pickle(model_info_file)
model = model_info['model']
inference = BayesianModelSampling(model)
# use the missing mr slots as evidence
all_slots = model_info['all_slots']
missing_slots = [mr for mr in all_slots if mr not in mr_slot_names]
evidence = [State(mr, 0) for mr in missing_slots]
inference = BayesianModelSampling(model)
# don't allow empty samples
sampled_slots = []
while (sampled_slots == []):
sample = inference.rejection_sample(evidence=evidence,
size=1,
return_type='recarray')
# return a list of the column names which had presence
sampled_slots = [
name for var, name in zip(sample.view('<i8'), sample.dtype.names)
if var == 1
]
return sampled_slots
def sample_dag(dag, num):
#zzz this loses disconnected nodes!!!
# bayesmod = BayesianModel(dag.edges())
# bayesmod = BayesianModel(dag)
bayesmod = BayesianModel()
bayesmod.add_nodes_from(dag.nodes())
bayesmod.add_edges_from(dag.edges())
tab_cpds = []
cards = {node: len(dag.node[node]['cpd']) for node in dag.nodes()}
for node in dag.nodes():
parents = dag.predecessors(node)
cpd = dag.node[node]['cpd']
if parents:
parent_cards = [cards[par] for par in parents]
logging.debug("TablularCPD({}, {}, {}, {}, {})".format(
node, cards[node], cpd, parents, parent_cards))
tab_cpds.append(
TabularCPD(node, cards[node], cpd, parents, parent_cards))
else:
logging.debug("TablularCPD({}, {}, {})".format(
node, cards[node], cpd))
tab_cpds.append(TabularCPD(node, cards[node], cpd))
logging.debug("cpds add: {}".format(tab_cpds))
print "model variables:", bayesmod.nodes()
for tab_cpd in tab_cpds:
print "cpd variables:", tab_cpd.variables
bayesmod.add_cpds(*tab_cpds)
logging.debug("cpds get: {}".format(bayesmod.get_cpds()))
inference = BayesianModelSampling(bayesmod)
logging.debug("generating data")
recs = inference.forward_sample(size=num, return_type='recarray')
return recs
class DynamicBayesianNetwork(Process):
defaults = {
'nodes': [],
'edges': [],
'conditional_probabilities': {
'node_id': []
}
}
def __init__(self, parameters=None):
super().__init__(parameters)
# set up the network based on the parameters
self.model = DBN()
self.model.add_nodes_from(self.parameters['nodes'])
self.model.add_edges_from(self.parameters['edges'])
print(f'EDGES: {sorted(self.model.edges())}')
import ipdb
ipdb.set_trace()
# TODO -- add 'evidence' -- get from network?
cpds = (TabularCPD(variable=node_id,
variable_card=len(values),
values=values,
evidence=[]) for node_id, values in
self.parameters['conditional_probabilities'])
self.model.add_cpds(cpds)
# make an inference instance for sampling the model
self.inference = BayesianModelSampling(self.model)
# get a sample
sample = self.inference.forward_sample(size=2)
def ports_schema(self):
return {}
def next_update(self, timestep, states):
return {}
def setUp(self):
self.bayesian_model = BayesianModel([('A', 'J'), ('R', 'J'), ('J', 'Q'),
('J', 'L'), ('G', 'L')])
cpd_a = TabularCPD('A', 2, [[0.2], [0.8]])
cpd_r = TabularCPD('R', 2, [[0.4], [0.6]])
cpd_j = TabularCPD('J', 2,
[[0.9, 0.6, 0.7, 0.1],
[0.1, 0.4, 0.3, 0.9]],
['R', 'A'], [2, 2])
cpd_q = TabularCPD('Q', 2,
[[0.9, 0.2],
[0.1, 0.8]],
['J'], [2])
cpd_l = TabularCPD('L', 2,
[[0.9, 0.45, 0.8, 0.1],
[0.1, 0.55, 0.2, 0.9]],
['G', 'J'], [2, 2])
cpd_g = TabularCPD('G', 2, [[0.6], [0.4]])
self.bayesian_model.add_cpds(cpd_a, cpd_g, cpd_j, cpd_l, cpd_q, cpd_r)
self.sampling_inference = BayesianModelSampling(self.bayesian_model)
self.markov_model = MarkovModel()
cpd_e = TabularCPD(variable='E',
variable_card=2,
values=[[0.95, 0.2], [0.05, 0.8]],
evidence=['M'],
evidence_card=[2])
# Associating the CPDs with the network
model.add_cpds(cpd_d, cpd_m, cpd_r, cpd_l, cpd_e)
# check_model checks for the network structure and CPDs and verifies that the CPDs are correctly
# defined and sum to 1.
model.check_model()
# Forward_sample then iterate and count strong musician/ good letter/both
inference = BayesianModelSampling(model)
numSamples = 10000
samples = inference.forward_sample(size=numSamples, return_type='recarray')
part1 = 0
strongLetter = 0
weakMusician = 0
strongLetterWeakMuscician = 0
# Samples have structure (M E D R L)
for sample in samples:
# P(m = strong)P(d = low)P(r = ∗ ∗ |m = strong, d = low)P(e = high|m = strong)P(letter = weak| ∗ ∗)
if sample[0] and not sample[2] and sample[3] == 2 and sample[
1] and not sample[4]:
part1 += 1
# P(letter = strong)
# Associating the CPDs with the network
pg_model.add_cpds(cpd_parent_edu, cpd_screentime, cpd_physical, cpd_obesity,
cpd_self_harm)
# check_model checks for the network structure and CPDs and verifies that the CPDs are correctly
# defined and sum to 1.
pg_model.check_model()
# examine conditional independence relationships:
pg_model.local_independencies("parent_education")
pg_model.local_independencies("child_obesity")
pg_model.local_independencies("child_screen_time")
pg_model.local_independencies("child_physical_activity")
# sample data from the network:
inference = BayesianModelSampling(pg_model)
sim_n = 50_000
simulated_sample = inference.forward_sample(size=sim_n)
for colname_j in simulated_sample.columns:
simulated_sample[colname_j] = (
simulated_sample[colname_j] == "high").astype(int)
# draw correlation plot of the variables:
corr_mat = simulated_sample.corr()
corr_mat.style.background_gradient(cmap="coolwarm").set_precision(2)
# eaxmple: if we condition on "child_screen_time"..
# ..then "child_physical_activity" becomes independent of "parent_education":
corr_mat = simulated_sample.query("child_screen_time==1").drop(
"child_screen_time", axis=1).corr()
corr_mat.style.background_gradient(cmap="coolwarm").set_precision(2)
[0.1, 0.2, 1, 1, 0.8, 0.9, 1, 1]
], #p(~G)
evidence=[
'BrokeElectionLaw', 'PoliticallyMotivatedProsecutor', 'Indicted'
],
evidence_card=[2, 2, 2])
cpd_j = TabularCPD(variable='Jailed',
variable_card=2,
values=[[0.9, 0.0], [0.1, 1.0]],
evidence=['FoundGuilty'],
evidence_card=[2])
#Associar os model aos nodos
election_model.add_cpds(cpd_b, cpd_i, cpd_m, cpd_g, cpd_j)
#Verificar as independencias
print(election_model.get_independencies())
samples = BayesianModelSampling(election_model).forward_sample(size=int(1e5))
samples.head()
#Mostrar estimativas
mle = MaximumLikelihoodEstimator(model=election_model, data=samples)
print("\nEstimating the CPD for a single node.\n")
print(mle.estimate_cpd(node='BrokeElectionLaw'))
print(mle.estimate_cpd(node='PoliticallyMotivatedProsecutor'))
print(mle.estimate_cpd(node='Indicted'))
print(mle.estimate_cpd(node='FoundGuilty'))
print(mle.estimate_cpd(node='Jailed'))
model = BayesianModel([('IncomeQ', 'Bedrooms'), ('HhSize', 'Bedrooms'),
('IncomeQ', 'RentQ'), ('Bedrooms', 'RentQ')])
#nx.draw_networkx(model, with_labels=True)
modelData = hh[model.nodes()].copy()
testData = modelData.iloc[int(0.85 * modelData.shape[0]):int(modelData.shape[0]
)].copy()
trainData = modelData.iloc[0:int(0.85 * modelData.shape[0])].copy()
model.fit(trainData, estimator=MaximumLikelihoodEstimator)
#for cpd in model.get_cpds():
# print("CPD of {variable}:".format(variable=cpd.variable))
# print(cpd)
model_sample = BayesianModelSampling(model)
pickle.dump(model_sample, open('results/sampler.p', 'wb'))
# open the nhts sample and add the inferred resType requirements
nhtsSample = pd.read_csv('results/nhtsSample.csv')
resType = []
for ind, row in nhtsSample.iterrows():
evidence = [
State('IncomeQ', min(row['hh_income'] - 1, 10)),
State('HhSize', min(row['hh_size'] - 1, 5))
]
sample = model_sample.likelihood_weighted_sample(evidence=evidence, size=1)
resType.extend([int(sample['Bedrooms']) * 3 + int(sample['RentQ'])])
nhtsSample['resType'] = resType
os.chdir('..')
nhtsSample[nhtsSample['occupation_type'] == 1].sample(
cpd1=[]
cpd1.append(p_21)
cpd1.append(p_52)
cpd1.append(p_14)
cpd1.append(p_64)
cpd1.append(p_36)
cpd1.append(p4)
model1.add_cpds(*cpd1)
print("------------------------------------------")
print("Edges of model1:", model1.edges())
print("Checking Model1:", model1.check_model())
print("------------------------------------------")
'''generate data for model1'''
inference = BayesianModelSampling(model1)
data=inference.forward_sample(size=3000, return_type='dataframe')
print("Data for model1:")
print(data)
k2=K2Score(data)
print('Model1 K2 Score: ' + str(k2.score(model1)))
'''Inference'''
from pgmpy.inference import VariableElimination
infer = VariableElimination(model1)
print("Inference of x3:")
print(infer.query(['x3']) ['x3'])
print("Inference of x5|x2:")
print(infer.query(['x5'], evidence={ 'x2': 1}) ['x5'])
def task3():
global task4_best_bm, task2_best_bm, task2_best_mm, task4_best_mm
st1 = time.time()
task2_best_bm_samples = (BayesianModelSampling(task2_best_bm)).forward_sample(size=1000)
et1 = time.time()
diff1 = et1 - st1
task2_best_bm_samplesC = task2_best_bm_samples.copy()
task2_best_bm_samplesC.drop('x1', axis=1, inplace=True)
task2_bm_predicted = task2_best_bm.predict(task2_best_bm_samplesC)
task2_best_mm = task2_best_bm.to_markov_model()
st2 = time.time()
task2_best_mm_samples = (GibbsSampling(task2_best_mm)).sample(size=1000)
et2 = time.time()
diff2 = et2 - st2
task2_best_mm_samples_values = (task2_best_mm_samples.values)
task2_mm_predicted=[]
task2_mmprop = BeliefPropagation(task2_best_mm)
for i in range(1000):
nik_temp = np.array(task2_best_mm_samples_values[i,:])
try:
task2_mm_predicted.append((task2_mmprop.map_query(variables=['x1'],
evidence={
'x2':int(nik_temp[2]),
'x3':int(nik_temp[1]),
'x4':int(nik_temp[5]),
'x5':int(nik_temp[0]),
'x6':int(nik_temp[4])
})))
except:
task2_mm_predicted.append({'x1':-1})
cnt1=0
cnt2=0
data1 = task2_best_mm_samples[['x1']].as_matrix()
data2 = task2_best_bm_samples[['x1']].as_matrix()
for i in range(1000):
if(task2_mm_predicted[i]['x1']==int(data1[i])):
cnt1=cnt1+1
#if(task2_bm_predicted[i]['x1']==int(data2[i])):
#cnt2=cnt2+1
task2_mm_acc = cnt1/10.0
task2_bm_acc = cnt2/10.0
print(" Bayesian Model for 'th' data : "+str(task2_best_bm.edges()))
print(" Bayesian Model for 'th' data takes time : "+str(diff1))
#print(" Bayesian Model for 'th' data has accuracy : "+str(task2_mm_acc))
print(" Markov Model for 'th' data : "+str(task2_best_mm.edges()))
print(" Markov Model for 'th' data takes time : "+str(diff2))
print(" Markov Model for 'th' data has accuracy : "+str(task2_mm_acc))
st3 = time.time()
task4_best_bm_samples = (BayesianModelSampling(task4_best_bm)).forward_sample(size=1000)
et3 = time.time()
diff3 = et3 - st3
'''
task4_best_bm_samplesC = task4_best_bm_samples.copy()
task4_best_bm_samplesC.drop('f1', axis=1, inplace=True)
#print(task4_best_bm_samplesC)
task4_bm_predicted = task4_best_bm.predict(task4_best_bm_samplesC)
#print(task4_bm_predicted)
'''
task4_best_mm = task4_best_bm.to_markov_model()
st4 = time.time()
task4_best_mm_samples = (GibbsSampling(task4_best_mm)).sample(size=1000)
et4 = time.time()
diff4 = et4 - st4
'''print(task4_best_mm_samples)
task4_best_mm_samples_values = (task4_best_mm_samples.values)
task4_mm_predicted=[]
task4_mmprop = BeliefPropagation(task4_best_mm)
for i in range(1000):
nik_temp = np.array(task4_best_mm_samples_values[i,:])
print((nik_temp))
try:
task4_mm_predicted.append((task4_mmprop.map_query(variables=['f1'],
evidence={
'f2':int(nik_temp[2]),
'f3':int(nik_temp[1]),
'f4':int(nik_temp[5]),
'f5':int(nik_temp[0]),
'f6':int(nik_temp[4]),
'f7':int(nik_temp[2]),
'f8':int(nik_temp[1]),
'f9':int(nik_temp[5])
})))
except:
task4_mm_predicted.append({'f1':-1})
cnt1=0
cnt2=0
data1 = task4_best_mm_samples[['f1']].as_matrix()
data2 = task4_best_bm_samples[['f1']].as_matrix()
for i in range(1000):
if(task2_mm_predicted[i]['x1']==int(data1[i])):
cnt1=cnt1+1
if(task2_bm_predicted[i]['x1']==int(data2[i])):
cnt2=cnt2+1
task2_mm_acc = cnt1/10.0
task2_bm_acc = cnt2/10.0'''
print(" Bayesian Model for 'and' data : "+str(task4_best_bm.edges()))
print(" Bayesian Model for 'and' data takes time : "+str(diff3))
#print(" Bayesian Model for 'th' data has accuracy : "+str(task2_mm_acc))
print(" Markov Model for 'and' data : "+str(task4_best_mm.edges()))
print(" Markov Model for 'and' data takes time : "+str(diff4))
class TestBayesianModelSampling(unittest.TestCase):
def setUp(self):
self.bayesian_model = BayesianModel([('A', 'J'), ('R', 'J'),
('J', 'Q'), ('J', 'L'),
('G', 'L')])
cpd_a = TabularCPD('A', 2, [[0.2], [0.8]])
cpd_r = TabularCPD('R', 2, [[0.4], [0.6]])
cpd_j = TabularCPD('J', 2,
[[0.9, 0.6, 0.7, 0.1], [0.1, 0.4, 0.3, 0.9]],
['R', 'A'], [2, 2])
cpd_q = TabularCPD('Q', 2, [[0.9, 0.2], [0.1, 0.8]], ['J'], [2])
cpd_l = TabularCPD('L', 2,
[[0.9, 0.45, 0.8, 0.1], [0.1, 0.55, 0.2, 0.9]],
['G', 'J'], [2, 2])
cpd_g = TabularCPD('G', 2, [[0.6], [0.4]])
self.bayesian_model.add_cpds(cpd_a, cpd_g, cpd_j, cpd_l, cpd_q, cpd_r)
self.sampling_inference = BayesianModelSampling(self.bayesian_model)
self.markov_model = MarkovModel()
def test_init(self):
with self.assertRaises(TypeError):
BayesianModelSampling(self.markov_model)
def test_forward_sample(self):
sample = self.sampling_inference.forward_sample(25)
self.assertEquals(len(sample), 25)
self.assertEquals(len(sample.columns), 6)
self.assertIn('A', sample.columns)
self.assertIn('J', sample.columns)
self.assertIn('R', sample.columns)
self.assertIn('Q', sample.columns)
self.assertIn('G', sample.columns)
self.assertIn('L', sample.columns)
self.assertTrue(set(sample.A).issubset({0, 1}))
self.assertTrue(set(sample.J).issubset({0, 1}))
self.assertTrue(set(sample.R).issubset({0, 1}))
self.assertTrue(set(sample.Q).issubset({0, 1}))
self.assertTrue(set(sample.G).issubset({0, 1}))
self.assertTrue(set(sample.L).issubset({0, 1}))
def test_rejection_sample_basic(self):
sample = self.sampling_inference.rejection_sample(
[State('A', 1), State('J', 1),
State('R', 1)], 25)
self.assertEquals(len(sample), 25)
self.assertEquals(len(sample.columns), 6)
self.assertIn('A', sample.columns)
self.assertIn('J', sample.columns)
self.assertIn('R', sample.columns)
self.assertIn('Q', sample.columns)
self.assertIn('G', sample.columns)
self.assertIn('L', sample.columns)
self.assertTrue(set(sample.A).issubset({1}))
self.assertTrue(set(sample.J).issubset({1}))
self.assertTrue(set(sample.R).issubset({1}))
self.assertTrue(set(sample.Q).issubset({0, 1}))
self.assertTrue(set(sample.G).issubset({0, 1}))
self.assertTrue(set(sample.L).issubset({0, 1}))
@patch("pgmpy.sampling.BayesianModelSampling.forward_sample",
autospec=True)
def test_rejection_sample_less_arg(self, forward_sample):
sample = self.sampling_inference.rejection_sample(size=5)
forward_sample.assert_called_once_with(self.sampling_inference, 5)
self.assertEqual(sample, forward_sample.return_value)
def test_likelihood_weighted_sample(self):
sample = self.sampling_inference.likelihood_weighted_sample(
[State('A', 0), State('J', 1),
State('R', 0)], 25)
self.assertEquals(len(sample), 25)
self.assertEquals(len(sample.columns), 7)
self.assertIn('A', sample.columns)
self.assertIn('J', sample.columns)
self.assertIn('R', sample.columns)
self.assertIn('Q', sample.columns)
self.assertIn('G', sample.columns)
self.assertIn('L', sample.columns)
self.assertIn('_weight', sample.columns)
self.assertTrue(set(sample.A).issubset({0, 1}))
self.assertTrue(set(sample.J).issubset({0, 1}))
self.assertTrue(set(sample.R).issubset({0, 1}))
self.assertTrue(set(sample.Q).issubset({0, 1}))
self.assertTrue(set(sample.G).issubset({0, 1}))
self.assertTrue(set(sample.L).issubset({0, 1}))
def tearDown(self):
del self.sampling_inference
del self.bayesian_model
del self.markov_model
def test_init(self):
with self.assertRaises(TypeError):
BayesianModelSampling(self.markov_model)
def task4():
global andRawData, task4_best_bm
k2Scores = []
andRawData_temp = pd.DataFrame(andRawData.values, columns=['f1','f2','f3','f4','f5','f6','f7','f8','f9'])
#Model 1
est = HillClimbSearch(andRawData_temp, scoring_method=K2Score(andRawData_temp))
model_temp = est.estimate()
estimator = BayesianEstimator(model_temp, andRawData_temp)
for fx in ['f1','f2','f3','f4','f5','f6','f7','f8','f9']:
cpd_fx = estimator.estimate_cpd(fx, prior_type="K2")
model_temp.add_cpds(cpd_fx)
task4_bms.append(model_temp)
print(" Model 1: Model through HillClimbSearch is : "+str(model_temp.edges()))
k2Score = K2Score((BayesianModelSampling(model_temp)).forward_sample(size=1000))
k2Scores_temp = k2Score.score(model_temp)
k2Scores.append(k2Scores_temp)
print(" Model 1: K2 Accuracy Score is "+str(k2Scores_temp))
#Model 2: Manual Model based on HillClimbSearch
model_temp = BayesianModel([('f3', 'f4'), ('f4', 'f9'), ('f3', 'f8'), ('f1', 'f7'), ('f5', 'f3'), ('f9', 'f8'), ('f1', 'f6'), ('f9', 'f1'), ('f9', 'f6'), ('f9', 'f2')])
estimator = BayesianEstimator(model_temp, andRawData_temp)
for fx in ['f1','f2','f3','f4','f5','f6','f7','f8','f9']:
cpd_fx = estimator.estimate_cpd(fx, prior_type="K2")
model_temp.add_cpds(cpd_fx)
task4_bms.append(model_temp)
print(" Model 2: Manual Model based on HillClimbSearch is : "+str(model_temp.edges()))
k2Score = K2Score((BayesianModelSampling(model_temp)).forward_sample(size=1000))
k2Scores_temp = k2Score.score(model_temp)
k2Scores.append(k2Scores_temp)
print(" Model 2: K2 Accuracy Score is "+str(k2Scores_temp))
#Model 3: Manual Model based on HillClimbSearch
model_temp = BayesianModel([('f3', 'f4'), ('f4', 'f9'), ('f3', 'f8'), ('f5', 'f7'), ('f5', 'f3'), ('f9', 'f8'), ('f1', 'f2'), ('f9', 'f1'), ('f9', 'f6'), ('f9', 'f2')])
estimator = BayesianEstimator(model_temp, andRawData_temp)
for fx in ['f1','f2','f3','f4','f5','f6','f7','f8','f9']:
cpd_fx = estimator.estimate_cpd(fx, prior_type="K2")
model_temp.add_cpds(cpd_fx)
task4_bms.append(model_temp)
print(" Model 3: Manual Model based on HillClimbSearch is : "+str(model_temp.edges()))
k2Score = K2Score((BayesianModelSampling(model_temp)).forward_sample(size=1000))
k2Scores_temp = k2Score.score(model_temp)
k2Scores.append(k2Scores_temp)
print(" Model 3: K2 Accuracy Score is "+str(k2Scores_temp))
#Model 4: Manual Model based on HillClimbSearch
model_temp = BayesianModel([('f3', 'f4'), ('f4', 'f9'), ('f5', 'f7'), ('f5', 'f3'), ('f1', 'f2'), ('f9', 'f1'), ('f9', 'f6'), ('f9', 'f8'),])
estimator = BayesianEstimator(model_temp, andRawData_temp)
for fx in ['f1','f2','f3','f4','f5','f6','f7','f8','f9']:
cpd_fx = estimator.estimate_cpd(fx, prior_type="K2")
model_temp.add_cpds(cpd_fx)
task4_bms.append(model_temp)
print(" Model 4: Manual Model based on HillClimbSearch is : "+str(model_temp.edges()))
k2Score = K2Score((BayesianModelSampling(model_temp)).forward_sample(size=1000))
k2Scores_temp = k2Score.score(model_temp)
k2Scores.append(k2Scores_temp)
print(" Model 4: K2 Accuracy Score is "+str(k2Scores_temp))
#Model 5: Manual Model based on Intuition
model_temp = BayesianModel([('f3', 'f4'), ('f4', 'f9'), ('f4', 'f7'), ('f1', 'f2'), ('f8', 'f5'), ('f9', 'f6'), ('f9', 'f8')])
estimator = BayesianEstimator(model_temp, andRawData_temp)
for fx in ['f1','f2','f3','f4','f5','f6','f7','f8','f9']:
cpd_fx = estimator.estimate_cpd(fx, prior_type="K2")
model_temp.add_cpds(cpd_fx)
task4_bms.append(model_temp)
print(" Model 5: Manual Model based on HillClimbSearch is : "+str(model_temp.edges()))
k2Score = K2Score((BayesianModelSampling(model_temp)).forward_sample(size=1000))
k2Scores_temp = k2Score.score(model_temp)
k2Scores.append(k2Scores_temp)
print(" Model 5: K2 Accuracy Score is "+str(k2Scores_temp))
task4_best_bm = task4_bms[k2Scores.index(max(k2Scores))]
print(" Best Bayesian Model with the highest accuracy score is thus Model "+str(1+k2Scores.index(max(k2Scores))))
class TestBayesianModelSampling(unittest.TestCase):
def setUp(self):
self.bayesian_model = BayesianModel([('A', 'J'), ('R', 'J'), ('J', 'Q'),
('J', 'L'), ('G', 'L')])
cpd_a = TabularCPD('A', 2, [[0.2], [0.8]])
cpd_r = TabularCPD('R', 2, [[0.4], [0.6]])
cpd_j = TabularCPD('J', 2,
[[0.9, 0.6, 0.7, 0.1],
[0.1, 0.4, 0.3, 0.9]],
['R', 'A'], [2, 2])
cpd_q = TabularCPD('Q', 2,
[[0.9, 0.2],
[0.1, 0.8]],
['J'], [2])
cpd_l = TabularCPD('L', 2,
[[0.9, 0.45, 0.8, 0.1],
[0.1, 0.55, 0.2, 0.9]],
['G', 'J'], [2, 2])
cpd_g = TabularCPD('G', 2, [[0.6], [0.4]])
self.bayesian_model.add_cpds(cpd_a, cpd_g, cpd_j, cpd_l, cpd_q, cpd_r)
self.sampling_inference = BayesianModelSampling(self.bayesian_model)
self.markov_model = MarkovModel()
def test_init(self):
with self.assertRaises(TypeError):
BayesianModelSampling(self.markov_model)
def test_forward_sample(self):
sample = self.sampling_inference.forward_sample(25)
self.assertEquals(len(sample), 25)
self.assertEquals(len(sample.columns), 6)
self.assertIn('A', sample.columns)
self.assertIn('J', sample.columns)
self.assertIn('R', sample.columns)
self.assertIn('Q', sample.columns)
self.assertIn('G', sample.columns)
self.assertIn('L', sample.columns)
self.assertTrue(set(sample.A).issubset({0, 1}))
self.assertTrue(set(sample.J).issubset({0, 1}))
self.assertTrue(set(sample.R).issubset({0, 1}))
self.assertTrue(set(sample.Q).issubset({0, 1}))
self.assertTrue(set(sample.G).issubset({0, 1}))
self.assertTrue(set(sample.L).issubset({0, 1}))
def test_rejection_sample_basic(self):
sample = self.sampling_inference.rejection_sample([State('A', 1), State('J', 1), State('R', 1)], 25)
self.assertEquals(len(sample), 25)
self.assertEquals(len(sample.columns), 6)
self.assertIn('A', sample.columns)
self.assertIn('J', sample.columns)
self.assertIn('R', sample.columns)
self.assertIn('Q', sample.columns)
self.assertIn('G', sample.columns)
self.assertIn('L', sample.columns)
self.assertTrue(set(sample.A).issubset({1}))
self.assertTrue(set(sample.J).issubset({1}))
self.assertTrue(set(sample.R).issubset({1}))
self.assertTrue(set(sample.Q).issubset({0, 1}))
self.assertTrue(set(sample.G).issubset({0, 1}))
self.assertTrue(set(sample.L).issubset({0, 1}))
@patch("pgmpy.sampling.BayesianModelSampling.forward_sample", autospec=True)
def test_rejection_sample_less_arg(self, forward_sample):
sample = self.sampling_inference.rejection_sample(size=5)
forward_sample.assert_called_once_with(self.sampling_inference, 5)
self.assertEqual(sample, forward_sample.return_value)
def test_likelihood_weighted_sample(self):
sample = self.sampling_inference.likelihood_weighted_sample([State('A', 0), State('J', 1), State('R', 0)], 25)
self.assertEquals(len(sample), 25)
self.assertEquals(len(sample.columns), 7)
self.assertIn('A', sample.columns)
self.assertIn('J', sample.columns)
self.assertIn('R', sample.columns)
self.assertIn('Q', sample.columns)
self.assertIn('G', sample.columns)
self.assertIn('L', sample.columns)
self.assertIn('_weight', sample.columns)
self.assertTrue(set(sample.A).issubset({0, 1}))
self.assertTrue(set(sample.J).issubset({0, 1}))
self.assertTrue(set(sample.R).issubset({0, 1}))
self.assertTrue(set(sample.Q).issubset({0, 1}))
self.assertTrue(set(sample.G).issubset({0, 1}))
self.assertTrue(set(sample.L).issubset({0, 1}))
def tearDown(self):
del self.sampling_inference
del self.bayesian_model
del self.markov_model
def bayesian_net():
musicianship_model = BayesianModel([('Difficulty', 'Rating'),
('Musicianship', 'Rating'),
('Musicianship', 'Exam'),
('Rating', 'Letter')])
cpd_diff = TabularCPD(variable='Difficulty',
variable_card=2,
values=[[0.6], [0.4]]) #0->Low, 1->High
cpd_music = TabularCPD(variable='Musicianship',
variable_card=2,
values=[[0.7], [0.3]]) #0->Weak 1->Strong
cpd_rating = TabularCPD(variable='Rating',
variable_card=3,
values=[[0.3, 0.05, 0.9, 0.5],
[0.4, 0.25, 0.08, 0.3],
[0.3, 0.7, 0.02, 0.2]],
evidence=['Difficulty', 'Musicianship'],
evidence_card=[2, 2]) #0->* 1->** 2-->***
cpd_exam = TabularCPD(variable='Exam',
variable_card=2,
values=[[0.95, 0.2], [0.05, 0.8]],
evidence=['Musicianship'],
evidence_card=[2]) #0-->Low 1-->High
cpd_letter = TabularCPD(variable='Letter',
variable_card=2,
values=[[0.1, 0.4, 0.99], [0.9, 0.6, 0.01]],
evidence=['Rating'],
evidence_card=[3]) #0-->Weak 1-->Strong
musicianship_model.add_cpds(cpd_diff, cpd_music, cpd_rating, cpd_exam,
cpd_letter)
musicianship_model.check_model()
infer = SimpleInference(musicianship_model) # query without normalization
print('------------------------')
print(' EXACT INFERENCE')
print('------------------------')
print('--------------------')
print(
' QUERY Letter with evidence Difficulty: 0, Musicianship: 1, Rating: 1, Exam:1 NOT NORMALIZED'
)
print('--------------------')
print(
infer.query(['Letter'],
evidence={('Difficulty', 0), ('Musicianship', 1),
('Rating', 1), ('Exam', 1)}))
print('--------------------')
print(
' QUERY Letter with evidence Difficulty: 0, Musicianship: 1, Rating: 1, Exam:1 NORMALIZED'
)
print('--------------------')
infer = VariableElimination(musicianship_model) # query normalized
print(
infer.query(['Letter'],
evidence={
'Difficulty': 0,
'Musicianship': 1,
'Rating': 1,
'Exam': 1
})['Letter'])
print('--------------------')
print(' QUERY Letter with no evidence')
print('--------------------')
print(infer.query(['Letter'])['Letter'])
print('--------------------')
print(' QUERY Letter with evidence Musicianship: 0 NORMALIZED')
print('--------------------')
print(infer.query(['Letter'], evidence={'Musicianship': 0})['Letter'])
sampling = BayesianModelSampling(musicianship_model)
data = sampling.likelihood_weighted_sample(evidence={},
size=2000,
return_type='dataframe')
musicianship_model_bis = BayesianModel([('Difficulty', 'Rating'),
('Musicianship', 'Rating'),
('Rating', 'Letter'),
('Musicianship', 'Exam')])
musicianship_model_bis.fit(data, estimator=BayesianEstimator)
musicianship_model_bis.check_model()
infer = VariableElimination(musicianship_model_bis) # query normalized
for cpd in musicianship_model_bis.get_cpds():
print("CPD of {variable}:".format(variable=cpd.variable))
print(cpd)
print('------------------------')
print(' APPROXIMATE INFERENCE')
print('------------------------')
print('--------------------')
print(
' QUERY Letter with evidence Difficulty: 0, Musicianship: 1, Rating: 1, Exam:1 NORMALIZED'
)
print('--------------------')
print(
infer.query(['Letter'],
evidence={
'Difficulty': 0,
'Musicianship': 1,
'Rating': 1,
'Exam': 1
})['Letter'])
print('--------------------')
print(' QUERY Letter with no evidence')
print('--------------------')
print(infer.query(['Letter'])['Letter'])
print('--------------------')
print(' QUERY Letter with evidence Musicianship: 0 NORMALIZED')
print('--------------------')
print(infer.query(['Letter'], evidence={'Musicianship': 0})['Letter'])
belpro.map_query(variables=['attendance'],
evidence={
'difficulty': 2,
'Q9': 3
}))
# print(belpro.map_query(variables=['Q25', 'Q18','Q16'],evidence={'instr':1}))
print(
belpro.map_query(variables=['attendance', 'Q9', 'difficulty'],
evidence={'class': 7}))
#Commented some queries because taking a lot of time to run
# print(belpro.map_query(variables=['Q28','Q11'],evidence={'instr':2, 'class':10}))
# print(belpro.map_query(variables=['Q18', 'Q26','Q13'],evidence={'instr':2}))
# print(belpro.map_query(variables=['Q23', 'Q21','Q17'],evidence={'instr':2}))
inference = BayesianModelSampling(bayesmodel)
df = inference.forward_sample(5)
# print df.shape
print df
print np.mean(df)
# print scipy.stats.entropy(df)
dataarray = panda.DataFrame.as_matrix(df)
print dataarray
arr = dataarray.astype(float)
print arr
sum1 = []
total = 0
count = 0