def __runOPF(self, X_train,y_train,index_train,X_test,y_test,index_test, score): # Creates a SupervisedOPF instance opf = SupervisedOPF(distance='log_squared_euclidean', pre_computed_distance=None) # Fits training data into the classifier opf.fit(X_train, y_train, index_train) # Predicts new data preds, conqs = opf.predict(X_test) self.__computeScore(y_test, preds, conqs, score)
def supervised_opf_feature_selection(opytimizer):
# Gathers features
features = opytimizer[:, 0].astype(bool)
# Remaking training and validation subgraphs with selected features
X_train_selected = X_train[:, features]
X_val_selected = X_val[:, features]
# Creates a SupervisedOPF instance
opf = SupervisedOPF(distance='log_squared_euclidean',
pre_computed_distance=None)
# Fits training data into the classifier
opf.fit(X_train_selected, Y_train)
# Predicts new data
preds = opf.predict(X_val_selected)
# Calculates accuracy
acc = g.opf_accuracy(Y_val, preds)
return 1 - acc
import opfython.stream.splitter as s
from opfython.models.supervised import SupervisedOPF
# Loading a .txt file to a numpy array
txt = l.load_txt('data/boat.txt')
# Parsing a pre-loaded numpy array
X, Y = p.parse_loader(txt)
# Splitting data into training and validation sets
X_train, X_val, Y_train, Y_val = s.split(X, Y, percentage=0.5, random_state=1)
# Creates a always true loop
while True:
# Creates a SupervisedOPF instance
opf = SupervisedOPF(distance='log_squared_euclidean',
pre_computed_distance=None)
# Fits training data into the classifier
opf.fit(X_train, Y_train)
# Predicts new data
preds = opf.predict(X_val)
# Calculating accuracy
acc = g.opf_accuracy(Y_val, preds)
print(f'Accuracy: {acc}')
# Gathers which samples were missclassified
errors = np.argwhere(Y_val != preds)
n = np.sqrt(np.random.rand(n_points, 1)) * 780 * (2 * np.pi) / 360
d1x = -np.cos(n) * n + np.random.rand(n_points, 1) * noise
d1y = np.sin(n) * n + np.random.rand(n_points, 1) * noise
return (np.vstack((np.hstack((d1x, d1y)), np.hstack(
(-d1x, -d1y)))), np.hstack((np.zeros(n_points), np.ones(n_points))))
X, y = twospirals(1000)
names = [
"Nearest Neighbors", "RBF SVM", "Decision Tree", "Naive Bayes", "OPF",
"VotingClassifier", "Random Forest", "AdaBoost", "XGBoost"
]
#opf = SupervisedOPF(distance = "log_squared_euclidean")
opf = SupervisedOPF()
#opf = KNNSupervisedOPF(max_k = 1)
classifiers = [
KNeighborsClassifier(3),
SVC(gamma=2, C=1),
DecisionTreeClassifier(max_depth=10),
GaussianNB(), opf,
VotingClassifier(estimators=[('knn', KNeighborsClassifier(3)),
('svm', SVC(gamma=2, C=1, probability=True)),
('gnb', GaussianNB()),
('dt', DecisionTreeClassifier(max_depth=10))],
weights=[1.2, 1.3, 1.1, 0.9],
voting="soft",
n_jobs=4),
RandomForestClassifier(max_depth=10, n_estimators=100),
import opfython.stream.loader as l
import opfython.stream.parser as p
import opfython.stream.splitter as s
from opfython.models.supervised import SupervisedOPF
# Loading a .txt file to a numpy array
txt = l.load_txt('data/boat.txt')
# Parsing a pre-loaded numpy array
X, Y = p.parse_loader(txt)
# Splitting data into training and validation sets
X_train, X_val, Y_train, Y_val = s.split(
X, Y, percentage=0.5, random_state=1)
# Creates a SupervisedOPF instance
opf = SupervisedOPF(distance='log_squared_euclidean',
pre_computed_distance=None)
# Performs the learning procedure
opf.learn(X_train, Y_train, X_val, Y_val, n_iterations=10)
def __init__(self, path_output): self.opfSup = SupervisedOPF(distance='log_squared_euclidean', pre_computed_distance=None) self.path_output=path_output
class US(object):
def __init__(self, path_output):
self.opfSup = SupervisedOPF(distance='log_squared_euclidean', pre_computed_distance=None)
self.path_output=path_output
def __classify(self, x_train,y_train, x_valid, y_valid, minority_class):
# Training the OPF
indexes = np.arange(len(x_train))
self.opfSup.fit(x_train, y_train,indexes)
# Prediction of the validation samples
y_pred,_ = self.opfSup.predict(x_valid)
y_pred = np.array(y_pred)
# Validation measures for this k nearest neighbors
accuracy = accuracy_score(y_valid, y_pred)
recall = recall_score(y_valid, y_pred, pos_label=minority_class) # assuming that 2 is the minority class
f1 = f1_score(y_valid, y_pred, pos_label=minority_class)
return accuracy, recall, f1, y_pred
def __saveResults(self, X_train,Y_train, X_test, Y_test, ds,f, approach, minority_class):
path = '{}/down_{}/{}/{}'.format(self.path_output,approach,ds,f)
if not os.path.exists(path):
os.makedirs(path)
results_print=[]
accuracy, recall, f1, pred = self.__classify(X_train,Y_train, X_test, Y_test, minority_class)
results_print.append([0,accuracy, recall, f1])
np.savetxt('{}/pred.txt'.format(path), pred, fmt='%d')
np.savetxt('{}/results.txt'.format(path), results_print, fmt='%d,%.5f,%.5f,%.5f')
def __saveDataset(self, X_train,Y_train, pathDataset,ds_name):
DS = np.insert(X_train,len(X_train[0]),Y_train , axis=1)
np.savetxt('{}/train_{}.txt'.format(pathDataset, ds_name),DS, fmt='%.5f,'*(len(X_train[0]))+'%d')
def __computeScore(self, labels, preds, conqs, score):
for i in range(len(labels)):
if labels[i]==preds[i]:
score[conqs[i]]+=1
else:
score[conqs[i]]-=1
def major_negative(self, output, X, Y, X_test, Y_test, path, majority_class, ds, f, minority_class):
#1st case: remove samples from majoritary class with negative scores
output_majority = output[output[:,1]==majority_class]
output_majority_negative = output_majority[output_majority[:,2]<0]
X_train = np.delete(X, output_majority_negative[:,0],0)
Y_train = np.delete(Y, output_majority_negative[:,0])
self.__saveDataset(X_train,Y_train, path,'major_negative')
self.__saveResults(X_train,Y_train, X_test, Y_test, ds,f, 'major_negative', minority_class)
def major_neutral(self, output, X, Y, X_test, Y_test, path, majority_class, ds, f, minority_class):
#2st case: remove samples from majoritary class with negative or zero scores
output_majority = output[output[:,1]==majority_class]
output_majority_neutal = output_majority[output_majority[:,2]<=0]
X_train = np.delete(X, output_majority_neutal[:,0],0)
Y_train = np.delete(Y, output_majority_neutal[:,0])
self.__saveDataset(X_train,Y_train, path,'major_neutral')
self.__saveResults(X_train,Y_train, X_test, Y_test, ds,f, 'major_neutral', minority_class)
def negative(self, output, X, Y, X_test, Y_test, path, majority_class, ds, f, minority_class):
#3st case: remove all samples with negative
output_negatives = output[output[:,2]<0]
X_train = np.delete(X, output_negatives[:,0],0)
Y_train = np.delete(Y, output_negatives[:,0])
self.__saveDataset(X_train,Y_train, path,'negative')
self.__saveResults(X_train,Y_train, X_test, Y_test, ds,f, 'negative', minority_class)
def negatives_major_zero(self, output, X, Y, X_test, Y_test, path, majority_class, ds, f, minority_class):
#4st case: remove samples from majoritary class with negative or zero scores
# and from minoritary class with negative scores
output_negatives = output[output[:,2]<0]
output_negatives_major_zero = output_negatives[output_negatives[:,1]==majority_class]
output_negatives_major_zero = output_negatives_major_zero[output_negatives_major_zero[:,2]<=0]
X_train = np.delete(X, output_negatives_major_zero[:,0],0)
Y_train = np.delete(Y, output_negatives_major_zero[:,0])
self.__saveDataset(X_train,Y_train, path,'negatives_major_zero')
self.__saveResults(X_train,Y_train, X_test, Y_test, ds,f, 'negatives_major_zero', minority_class)
def balance(self, output, X, Y, X_test, Y_test, path, majority_class, ds, f, minority_class):
#5st case: remove samples from majoritary class until balancing the dataset
# find the number of samples to remove
n_samples = len(output)
n_samples_minority = len(output[output[:,1]==2])
n_samples_to_remove = n_samples - (n_samples_minority*2)
# sort samples from majority class by score
output_majority= output[output[:,1]==majority_class]
order = np.argsort(output_majority[:,2])
output_majority_ordered = output_majority[order,:]
# remove samples
output_to_remove = output_majority_ordered[:n_samples_to_remove,:]
X_train = np.delete(X, output_to_remove[:,0],0)
Y_train = np.delete(Y, output_to_remove[:,0])
# save new dataset and results
self.__saveDataset(X_train,Y_train, path,'balance')
self.__saveResults(X_train,Y_train, X_test, Y_test, ds,f, 'balance', minority_class)
def __runOPF(self, X_train,y_train,index_train,X_test,y_test,index_test, score):
# Creates a SupervisedOPF instance
opf = SupervisedOPF(distance='log_squared_euclidean',
pre_computed_distance=None)
# Fits training data into the classifier
opf.fit(X_train, y_train, index_train)
# Predicts new data
preds, conqs = opf.predict(X_test)
self.__computeScore(y_test, preds, conqs, score)
def run(self, X, Y, indices):
# Create stratified k-fold subsets
kfold = 5 # no. of folds
skf = StratifiedKFold(kfold, shuffle=True,random_state=1)
skfind = [None] * kfold # skfind[i][0] -> train indices, skfind[i][1] -> test indices
cnt = 0
for index in skf.split(X, Y):
skfind[cnt] = index
cnt += 1
score = np.zeros((5,len(X)))
for i in range(kfold):
train_indices = skfind[i][0]
test_indices = skfind[i][1]
X_train = X[train_indices]
y_train = Y[train_indices]
index_train = indices[train_indices]
X_test = X[test_indices]
y_test = Y[test_indices]
index_test = indices[test_indices]
self.__runOPF(X_train,y_train,index_train,X_test,y_test,index_test, score[i])
output= np.zeros((len(indices),8))
score_t = np.transpose(score)
output[:,0] =indices
output[:,1] =Y
output[:,2] =np.sum(score_t,axis=1)
output[:,3:] =score_t
return output
modelXgbEmpty = XGBClassifier()
grdSearch = GridSearchCV(modelXgbEmpty, {
'max_depth': [2, 4, 8, 10],
'n_estimators': [50, 100, 200, 400]
},
verbose=1,
error_score='accuracy')
grdSearch.fit(X_train, y_train)
grdSearch.best_score_, grdSearch.best_params_
y_pred = grdSearch.predict(X_test)
print(classification_report(y_test, y_pred))
print(accuracy_score(y_test, y_pred))
#Testando Algoritmo OPF (Não é Essemble apenas para demonstração)
modelOPF = SupervisedOPF(distance='manhattan')
# manhattan = 74
# squared_euclidean 72
# log_euclidean 74
# bray_curtis 71
# canberra 71
# log_squared_euclidean 74
# squared_euclidean 72
# gaussian 37
# squared_cord 53
y_train_opf = y_train + 1
y_test_opf = y_test + 1
modelOPF.fit(X_train, y_train_opf)
predsOPF = modelOPF.predict(X_test)
from opfython.models.supervised import SupervisedOPF
# Creates a SupervisedOPF instance
opf = SupervisedOPF(distance='log_squared_euclidean',
pre_computed_distance=None)
Args:
obj (BaseClassifier | OPF): A BaseClassifier or OPF child instance.
"""
# Creates a property to hold the class itself
self.obj = obj
# Defines a classifier dictionary constant with the possible values
CLF = dict(
dt=Classifier(DecisionTreeClassifier()),
linear_svc=Classifier(LinearSVC()),
lr=Classifier(LogisticRegression()),
nb=Classifier(GaussianNB()),
opf=Classifier(SupervisedOPF()),
opf_meta=Classifier(SupervisedOPF(distance='canberra')),
rf=Classifier(RandomForestClassifier()),
svc=Classifier(SVC()),
)
def get_clf(name):
"""Gets a classifier by its identifier.
Args:
name (str): Classfier's identifier.
Returns:
An instance of the Classifier class.
