def NBAccuracy(features_train, labels_train, features_test, labels_test):
""" compute the accuracy of your Naive Bayes classifier """
### import the sklearn module for GaussianNB
from sklearn.naive_bayes import GaussianNB
from sklearn.metrics import accuracy_score
### create classifier
clf = GaussianNB() #TODO
### fit the classifier on the training features and labels
#TODO
clf.fit(features_train,labels_train)
### use the trained classifier to predict labels for the test features
pred = clf.predict(features_test)
### calculate and return the accuracy on the test data
### this is slightly different than the example,
### where we just print the accuracy
### you might need to import an sklearn module
#num = len(pred)
#corr = 0.0
#for i in range(len(pred)):
# if pred[i] == labels_test[i]:
# corr += 1
#accuracy = corr/num
accuracy = accuracy_score(pred,labels_test)
return accuracy
def test_string_labels_refit_false():
np.random.seed(123)
clf1 = LogisticRegression()
clf2 = RandomForestClassifier()
clf3 = GaussianNB()
y_str = y.copy()
y_str = y_str.astype(str)
y_str[:50] = 'a'
y_str[50:100] = 'b'
y_str[100:150] = 'c'
clf1.fit(X, y_str)
clf2.fit(X, y_str)
clf3.fit(X, y_str)
eclf = EnsembleVoteClassifier(clfs=[clf1, clf2, clf3],
voting='hard',
refit=False)
eclf.fit(X, y_str)
assert round(eclf.score(X, y_str), 2) == 0.97
eclf = EnsembleVoteClassifier(clfs=[clf1, clf2, clf3],
voting='soft',
refit=False)
eclf.fit(X, y_str)
assert round(eclf.score(X, y_str), 2) == 0.97
def NBAccuracy(features_train, labels_train, features_test, labels_test):
""" compute the accuracy of your Naive Bayes classifier """
### import the sklearn module for GaussianNB
from sklearn.naive_bayes import GaussianNB
### create classifier
clf = GaussianNB()
### fit the classifier on the training features and labels
clf.fit(features_train, labels_train)
### use the trained classifier to predict labels for the test features
pred = clf.predict(features_test)
### calculate and return the accuracy on the test data
### this is slightly different than the example,
### where we just print the accuracy
### you might need to import an sklearn module
intersect = [i for i, j in zip(pred, labels_test) if i == j]
matched = len(intersect)
total = len(labels_test)
accuracy = float(matched) / float(total)
return accuracy
def main():
"""
主函数
"""
# 准备数据集
train_data, test_data = utils.prepare_data()
# 查看数据集
utils.inspect_dataset(train_data, test_data)
# 特征工程处理
# 构建训练测试数据
X_train, X_test = utils.do_feature_engineering(train_data, test_data)
print('共有{}维特征。'.format(X_train.shape[1]))
# 标签处理
y_train = train_data['label'].values
y_test = test_data['label'].values
# 数据建模及验证
print('\n===================== 数据建模及验证 =====================')
nb_model = GaussianNB()
nb_model.fit(X_train, y_train)
y_pred = nb_model.predict(X_test)
print('准确率：', accuracy_score(y_test, y_pred))
print('AUC值：', roc_auc_score(y_test, y_pred))
def scikitNBClassfier(self):
dataMat, labels = self.loadProcessedData()
bayesian = Bayesian()
myVocabList = bayesian.createVocabList(dataMat)
## 建立bag of words 矩阵
trainMat = []
for postinDoc in dataMat:
trainMat.append(bayesian.setOfWords2Vec(myVocabList, postinDoc))
from sklearn.naive_bayes import GaussianNB
gnb = GaussianNB()
X = array(trainMat)
y = labels
testText = "美国军队的军舰今天访问了巴西港口城市，并首次展示了核潜艇攻击能力，飞机，监听。他们表演了足球。"
testEntry = self.testEntryProcess(testText)
bayesian = Bayesian()
thisDoc = array(bayesian.setOfWords2Vec(myVocabList, testEntry))
## 拟合并预测
y_pred = gnb.fit(X, y).predict(thisDoc)
clabels = ['军事', '体育']
y_pred = gnb.fit(X, y).predict(X)
print("Number of mislabeled points : %d" % (labels != y_pred).sum())
def NBAccuracy(features_train, labels_train, features_test, labels_test):
""" compute the accuracy of your Naive Bayes classifier """
### import the sklearn module for GaussianNB
from sklearn.naive_bayes import GaussianNB
### create classifier
clf = GaussianNB()
### fit the classifier on the training features and labels
clf.fit(features_train, labels_train)
### use the trained classifier to predict labels for the test features
pred = clf.predict(features_test)
### calculate and return the accuracy on the test data
### this is slightly different than the example,
### where we just print the accuracy
### you might need to import an sklearn module
total = len(labels_test)
correct = (pred == labels_test).sum()
accuracy = correct/float(total)
from sklearn.metrics import accuracy_score
accuracy = accuracy_score(labels_test,pred )
return accuracy
def categorize(train_data,test_data,train_class,n_features):
#cf= ExtraTreesClassifier()
#cf.fit(train_data,train_class)
#print (cf.feature_importances_)
#lsvmcf = sklearn.svm.LinearSVC(penalty='l2', loss='l2', dual=True, tol=0.0001, C=100.0)
model = LogisticRegression()
lgr = LogisticRegression(C=100.0,penalty='l1')
#knn = KNeighborsClassifier(n_neighbors=5, weights='uniform', algorithm='auto', leaf_size=10, p=2, metric='minkowski', metric_params=None)
svmlcf = sklearn.svm.SVC(C=1000.0, kernel='linear', degree=1, gamma=0.01, probability=True)#2
svmcf = sklearn.svm.SVC(C=1000.0, kernel='rbf', degree=1, gamma=0.01, probability=True)#2
cf = DecisionTreeClassifier()
dct = DecisionTreeClassifier(criterion='gini', splitter='best', min_samples_split=7, min_samples_leaf=4)
rf = RandomForestClassifier(n_estimators=10, criterion='gini', min_samples_split=7, min_samples_leaf=4, max_features='auto')
gnb = GaussianNB() #1
adbst = sklearn.ensemble.AdaBoostClassifier(base_estimator=rf, n_estimators=5, learning_rate=1.0, algorithm='SAMME.R', random_state=True)
#ch2 = SelectKBest(chi2, k=n_features)
#train_data = ch2.fit_transform(train_data, train_class)
#test_data = ch2.transform(test_data)
#rfe = RFE(svmlcf,n_features)
#rfe = rfe.fit(train_data, train_class)
gnb.fit(train_data,train_class)
return gnb.predict(test_data)
class GaussianColorClassifier(ContourClassifier):
'''
A contour classifier which classifies a contour
based on it's mean color in BGR, HSV, and LAB colorspaces,
using a Gaussian classifier for these features.
For more usage info, see class ContourClassifier
'''
FEATURES = ['B', 'G', 'R', 'H', 'S', 'V', 'L', 'A', 'B']
def __init__(self, classes, **kwargs):
super(GaussianColorClassifier, self).__init__(classes, **kwargs)
self.classifier = GaussianNB()
def get_features(self, img, mask):
mean = cv2.mean(img, mask)
mean = np.array([[mean[:3]]], dtype=np.uint8)
mean_hsv = cv2.cvtColor(mean, cv2.COLOR_BGR2HSV)
mean_lab = cv2.cvtColor(mean, cv2.COLOR_BGR2LAB)
features = np.hstack((mean.flatten(), mean_hsv.flatten(), mean_lab.flatten()))
return features
def classify_features(self, features):
return self.classifier.predict(features)
def feature_probabilities(self, features):
return self.classifier.predict_proba(features)
def train(self, features, classes):
self.classifier.fit(features, classes)
def NB_experiment(data_fold, train, test, dumper):
print "Ready to find the Best Parameters for Naive Bayes"
print 'Gaussian Naive Bayes'
nb = GNB()
print "fitting NaiveBayes Experiment"
dumper.write('Classifier: Naive Bayes\n')
scores = cross_validation.cross_val_score(nb, train[0], train[1],
cv = data_fold, score_func=accus)
reports = "Accuracy on Train: %0.2f (+/- %0.2f)"%(scores.mean(), scores.std()/2)
print reports
dumper.write(reports+'\n')
reports = " ".join(['%0.2f'%(item) for item in scores])
dumper.write(reports+'\n')
nb = GNB()
nb.fit(train[0], train[1])
pred = clf_test(nb, test)
output_ranking(pred, codecs.open('nb.ranking', 'w', 'utf-8'))
return None
def getGaussianPred(featureMatrix, labels, testSet, testSet_docIndex):
"""
All input arguments are return of getTrainTestData()
:param featureMatrix:
:param labels:
:param testSet:
:param testSet_docIndex:
:return docIndexPred: dict{docid: [index1, index2, ...], ...}
key is docid
value is all cognates' index
"""
gnb = GaussianNB()
gnb.fit(featureMatrix, labels)
# pred = gnb.predict(featureMatrix)
pred = gnb.predict(testSet)
docIndexPred = dict()
for i, p in enumerate(pred):
if p:
docid = testSet_docIndex[i, 0]
index = testSet_docIndex[i, 1]
if docid in docIndexPred:
docIndexPred[docid].append(index)
else:
docIndexPred[docid] = [index]
return docIndexPred
def NBAccuracy(features_train, labels_train, features_test, labels_test):
""" compute the accuracy of your Naive Bayes classifier """
### import the sklearn module for GaussianNB
from sklearn.naive_bayes import GaussianNB
### create classifier
clf = GaussianNB()
t0 = time()
### fit the classifier on the training features and labels
clf.fit(features_train, labels_train)
print "training time:", round(time()-t0, 3), "s"
### use the trained classifier to predict labels for the test features
import numpy as np
t1 = time()
pred = clf.predict(features_test)
print "predicting time:", round(time()-t1, 3), "s"
### calculate and return the accuracy on the test data
### this is slightly different than the example,
### where we just print the accuracy
### you might need to import an sklearn module
accuracy = clf.score(features_test, labels_test)
return accuracy
def NBAccuracy(features_train, labels_train, features_test, labels_test): #Import sklearn modules for GaussianNB from sklearn.naive_bayes import GaussianNB from sklearn.metrics import accuracy_score #Create classifer classifer = GaussianNB(); #Timing fit algorithm t0 = time(); #Fit classier on the training features classifer.fit(features_train, labels_train); print "Training Time: ", round(time() - t0, 3), "s"; GaussianNB(); #Timing prediction algorithm t0=time(); #Use trained classifer to predict labels for test features pred = classifer.predict(features_test); print "Prediction Time: ", round(time() - t0, 3), "s"; #Calculate accuracy from features_test with answer in labels_test accuracy = accuracy_score(pred, labels_test); return accuracy;
def performNB(trainingScores, trainingResults, testScores): print "->Gaussian NB" X = [] for currMark in trainingScores: pass for idx in range(0, len(trainingScores[currMark])): X.append([]) for currMark in trainingScores: if "Asym" in currMark: continue print currMark, for idx in range(0, len(trainingScores[currMark])): X[idx].append(trainingScores[currMark][idx]) X_test = [] for idx in range(0, len(testScores[currMark])): X_test.append([]) for currMark in trainingScores: if "Asym" in currMark: continue for idx in range(0, len(testScores[currMark])): X_test[idx].append(testScores[currMark][idx]) gnb = GaussianNB() gnb.fit(X, np.array(trainingResults)) y_pred = gnb.predict_proba(X_test)[:, 1] print "->Gaussian NB" return y_pred
def NB(text):
### features_train and features_test are the features for the training
### and testing datasets, respectively
### labels_train and labels_test are the corresponding item labels
features_train, features_test, labels_train, labels_test = Preprocess()
Ifeatures_train,Ifeatures_test,Ilabels_train=preprocess_input([text])
# classification goes here
clf = GaussianNB()
# training
train_t0 = time()
clf.fit(features_train, labels_train)
train_t1 = time()
# prediction or testing
test_t0 = time()
predict = clf.predict(features_test)
test_t1 = time()
print "accuracy: ", clf.score(features_test, labels_test)
print "#################################"
print "tain time: ", round(train_t1 - train_t0, 3), "s"
print "prediction time: ", round(test_t1 - test_t0, 3), "s"
print "#################################"
clf.fit(Ifeatures_train,Ilabels_train)
print ("prediction of ",str(clf.predict(Ifeatures_test))[1])
#print "prediction of ", clf.predict(preprocess_input(text))
return str(clf.predict(Ifeatures_test))[1]
class GaussianNBClassifier: def __init__(self): """ This is the constructor responsible for initializing the classifier """ self.outputHeader = "#gnb" self.clf = None def buildModel(self): """ This builds the model of the Gaussian NB classifier """ self.clf = GaussianNB() def trainGaussianNB(self,X, Y): """ Training the Gaussian NB Classifier """ self.clf.fit(X, Y) def validateGaussianNB(self,X, Y): """ Validate the Gaussian NB Classifier """ YPred = self.clf.predict(X) print accuracy_score(Y, YPred) def testGaussianNB(self,X, Y): """ Test the Gaussian NB Classifier """ YPred = self.clf.predict(X) print accuracy_score(Y, YPred)
def classify(features_train, labels_train):
clf = GaussianNB()
clf.fit(features_train, labels_train)
### import the sklearn module for GaussianNB
### create classifier
### fit the classifier on the training features and labels
return clf
def naive_bayes(features, labels):
classifier = GaussianNB()
classifier.fit(features, labels)
scores = cross_validation.cross_val_score(
classifier, features, labels, cv=10, score_func=metrics.precision_recall_fscore_support
)
print_table("Naive Bayes", numpy.around(numpy.mean(scores, axis=0), 2))
def test_gnb_prior():
# Test whether class priors are properly set.
clf = GaussianNB().fit(X, y)
assert_array_almost_equal(np.array([3, 3]) / 6.0, clf.class_prior_, 8)
clf.fit(X1, y1)
# Check that the class priors sum to 1
assert_array_almost_equal(clf.class_prior_.sum(), 1)
def nb_names():
#generate list of tuple names
engine = create_engine('sqlite:///names.db')
DBSession = sessionmaker(bind=engine)
session = DBSession()
db_names = names.Names.getAllNames(session)
names_list = [(x,'name') for x in db_names]
words_list = generate_words()
sample_names = [names_list[i] for i in sorted(random.sample(xrange(len(names_list)), len(words_list)))]
data = sample_names + words_list
shuffled_data = np.random.permutation(data)
strings = []
classification = []
for item in shuffled_data:
strings.append([item[0]])
classification.append(str(item[1]))
X = np.array(strings)
Y = np.array(classification)
print X,Y
clf = GaussianNB()
clf.fit(X, Y)
def trainNB():
featureVector = []
classVector = []
temp= []
headerLine = True
#training
train = open(r'C:\Python34\alchemyapi_python\TrainingDataDummy.csv')
for line in train:
if(headerLine):
headerLine = False
else:
temp = line.split(",")
x = [float(temp[i]) for i in activeFeatureIndex]
#print(x)
featureVector.append(x)
#temp = [int(x) for x in line.split(",")[-1].rstrip("\n")]
classVector.append(int(line.split(",")[-1].rstrip("\n")))
fVector = np.array(featureVector)
cVector = np.array(classVector)
#print(classVector)
print(fVector.shape)
print(cVector.shape)
clf = GaussianNB()
clf.fit(fVector,cVector)
train.close()
return clf
class CruiseAlgorithm(object): # cruise algorithm is used to classify the cruise phase vs noncruise phase, it uses the differential change in data stream as the input matrix def __init__(self, testing=False): self.core = GaussianNB() self.scaler = RobustScaler() self.X_prev = None self.testing = testing def fit(self,X,Y): # Y should be the label of cruise or not X = self.prepare(X) self.core.fit(X,Y.ravel()) def predict(self, X): if self.testing: X_t = self.prepare(X) else: if self.X_prev: X_t = X - self.X_prev else: X_t = X self.X_prev = X print repr(X_t) prediction_result = self.core.predict(X_t) return np.asmatrix(prediction_result) def prepare(self,X): a = np.zeros((X.shape[0],X.shape[1])) for i in xrange(X.shape[0]-1): a[i+1,:] = X[i+1] - X[i] return a
def selectKBest(previous_result, data): # remove 'restricted_stock_deferred' and 'director_fees' previous_result.pop(4) previous_result.pop(4) result = [] _k = 10 for k in range(0,_k): feature_list = ['poi'] for n in range(0,k+1): feature_list.append(previous_result[n][0]) data = featureFormat(my_dataset, feature_list, sort_keys = True, remove_all_zeroes = False) labels, features = targetFeatureSplit(data) features = [abs(x) for x in features] from sklearn.cross_validation import StratifiedShuffleSplit cv = StratifiedShuffleSplit(labels, 1000, random_state = 42) features_train = [] features_test = [] labels_train = [] labels_test = [] for train_idx, test_idx in cv: for ii in train_idx: features_train.append( features[ii] ) labels_train.append( labels[ii] ) for jj in test_idx: features_test.append( features[jj] ) labels_test.append( labels[jj] ) from sklearn.naive_bayes import GaussianNB clf = GaussianNB() clf.fit(features_train, labels_train) predictions = clf.predict(features_test) score = score_func(labels_test,predictions) result.append((k+1,score[0],score[1],score[2])) return result
class RegularizedGaussianNB:
"""
Three types of regularization are possible:
- regularized the variance of a feature within a class toward the
average variance of all features from that class
- regularize the variance of a feature within a class toward its
pooled variance across all classes
- add some constant amount of variance to each feature
In practice, the latter seems to work the best, though the regularization
value should be cross-validated.
"""
def __init__(self, avg_weight = 0, pooled_weight = 0, extra_variance = 0.1):
self.pooled_weight = pooled_weight
self.avg_weight = avg_weight
self.extra_variance = extra_variance
self.model = GaussianNB()
def fit(self, X,Y):
self.model.fit(X,Y)
p = self.pooled_weight
a = self.avg_weight
ev = self.extra_variance
original_weight = 1.0 - p - a
pooled_variances = np.var(X, 0)
for i in xrange(self.model.sigma_.shape[0]):
class_variances = self.model.sigma_[i, :]
new_variances = original_weight*class_variances + \
p * pooled_variances + \
a * np.mean(class_variances) + \
ev
self.model.sigma_[i, :] = new_variances
def predict(self, X):
return self.model.predict(X)
def test_classification():
t = zeros(len(target))
t[target == 'setosa'] = 1
t[target == 'versicolor'] = 2
t[target == 'virginica'] = 3
from sklearn.naive_bayes import GaussianNB
classifier = GaussianNB()
classifier.fit(data,t) # training on the iris dataset
print classifier.predict(data[0])
print t[0]
from sklearn import cross_validation
train, test, t_train, t_test = cross_validation.train_test_split(data, t, test_size=0.4, random_state=0)
classifier.fit(train,t_train) # train
print classifier.score(test,t_test) # test
from sklearn.metrics import confusion_matrix
print confusion_matrix(classifier.predict(test),t_test)
from sklearn.metrics import classification_report
print classification_report(classifier.predict(test), t_test, target_names=['setosa', 'versicolor', 'virginica'])
from sklearn.cross_validation import cross_val_score
# cross validation with 6 iterations
scores = cross_val_score(classifier, data, t, cv=6)
print scores
from numpy import mean
print mean(scores)
def simple_svm_train(emotion, training_set): song_list = [] sizes_list = [] other_emotions = [] # print 'Start to sample set' # Setting up the data sampled_dict = create_sample_dict(training_set) # print 'Set sampled, extracting features' feature_vector, class_vector, test_values, test_class = extract_features(sampled_dict, emotion, training_set) # Creating the classifier using sklearn # print 'Extracted features, training classifier' clf = GaussianNB() clf.fit(feature_vector,class_vector) # clf = svm.SVC(max_iter = 10000) # clf.fit(feature_vector,class_vector) # print 'Finished training classifier' # Testing and analyzing results results = test_classifier(clf, emotion, test_values) return post_process_results(results, emotion)
def MyNaiveBayes(object):
pre = PreProcess()
(training_value, test_value, test_pos_x, test_pos_y, training_pos_x, training_pos_y) = pre.split()
# 模型初始化
clf_x = GaussianNB()
clf_y = GaussianNB()
# 进行模型的训练
clf_x.fit(training_value, training_pos_x)
clf_y.fit(training_value, training_pos_y)
# 计算结果
result_pos_x = clf_x.predict(test_value)
result_pos_y = clf_y.predict(test_value)
'''
print result_pos_x
print test_pos_x
print result_pos_y
print test_pos_y
'''
# 计算误差
x_dis = []
y_dis = []
d_dis = []
for i in range(len(result_pos_x)):
x_dis.append(abs(result_pos_x[i] - test_pos_x[i]))
y_dis.append(abs(result_pos_y[i] - test_pos_y[i]))
d_dis.append(math.sqrt((result_pos_x[i]-test_pos_x[i])**2+(result_pos_y[i]-test_pos_y[i])**2))
x = (sum(x_dis))/len(result_pos_x)
y = (sum(y_dis))/len(result_pos_y)
d = (sum(d_dis))/len(d_dis)
print x, y, d
return x, y, d
def myClassifier(X,Y,model,CV=4, scoreType='pure'):
# X = [[0, 0], [1, 1],[1, 2]]
# y = [0, 1, 2]
score = {}
print "Error Analysis using", scoreType
if model == "SVM":
clf = svm.SVC(probability=True, random_state=0, kernel='rbf')
#clf = svm.SVR(cache_size=7000)
elif model == "LR":
clf = linear_model.LogisticRegression()
clf.fit(X, Y)
elif model == "NB":
clf = GaussianNB()
clf.fit(X, Y)
elif model=='MLP': # multilayer perceptron
clf = MLPClassifier( hidden_layer_sizes=[100],algorithm='l-bfgs')
clf.fit(X, Y)
if scoreType == 'cv':
accu = np.mean(cross_validation.cross_val_score(clf, X, Y, scoring='accuracy',cv=CV))
elif scoreType == 'pure':
predictions=clf.predict(X)
accu = sum([int(predictions[q]==Y[q]) for q in range(len(Y))])/len(Y)
return accu, clf
def createNaiveBayesModel(feature_vector_data):
'''
Uses the dimensionally reduced feature vectors of each of the instance, sense id pairs
to create a naive bayes model
'''
naive_bayes_model_word_type = {}
for word_type, instance_sense_dict in feature_vector_data.iteritems():
vectors = []
senses = []
for i in xrange(len(instance_sense_dict)):
sense = instance_sense_dict.keys()[i][1]
data_type = instance_sense_dict.keys()[i][2]
#Need to grab the TSNE vectors and senses of only the training data
#Thus, we ignore all the validation data
if data_type == "training":
vectors.append(instance_sense_dict.values()[i])
senses.append(sense)
vectors = np.array(vectors)
senses = np.array(senses)
nb = GaussianNB()
nb.fit(vectors, senses)
naive_bayes_model_word_type[word_type] = nb
return naive_bayes_model_word_type
def boundaries():
# import some data to play with
iris = datasets.load_iris()
X = iris.data[:, :2]
y = iris.target
h = .02
means = np.empty((X.shape[1], len(set(y))))
for i,lab in enumerate(list(set(y))):
means[:,i] = X[y==lab].mean(axis=0)
x_min, x_max = X[:, 0].min() - 1, X[:, 0].max() + 1
y_min, y_max = X[:, 1].min() - 1, X[:, 1].max() + 1
xx, yy = np.meshgrid(np.arange(x_min, x_max, h),
np.arange(y_min, y_max, h))
nb = GaussianNB()
nb.fit(X, y)
Z = nb.predict(np.c_[xx.ravel(), yy.ravel()])
Z = Z.reshape(xx.shape)
plt.contourf(xx, yy, Z, cmap=plt.cm.Paired, alpha=0.8)
plt.scatter(means[0,:], means[1,:])
plt.xlabel('Sepal length')
plt.ylabel('Sepal width')
plt.xlim(xx.min(), xx.max())
plt.ylim(yy.min(), yy.max())
plt.xticks(())
plt.yticks(())
plt.savefig("decision_boundary.pdf")
plt.clf()
def univariateFeatureSelection(f_list, my_dataset): result = [] for feature in f_list: # Replace 'NaN' with 0 for name in my_dataset: data_point = my_dataset[name] if not data_point[feature]: data_point[feature] = 0 elif data_point[feature] == 'NaN': data_point[feature] =0 data = featureFormat(my_dataset, ['poi',feature], sort_keys = True, remove_all_zeroes = False) labels, features = targetFeatureSplit(data) features = [abs(x) for x in features] from sklearn.cross_validation import StratifiedShuffleSplit cv = StratifiedShuffleSplit(labels, 1000, random_state = 42) features_train = [] features_test = [] labels_train = [] labels_test = [] for train_idx, test_idx in cv: for ii in train_idx: features_train.append( features[ii] ) labels_train.append( labels[ii] ) for jj in test_idx: features_test.append( features[jj] ) labels_test.append( labels[jj] ) from sklearn.naive_bayes import GaussianNB clf = GaussianNB() clf.fit(features_train, labels_train) predictions = clf.predict(features_test) score = score_func(labels_test,predictions) result.append((feature,score[0],score[1],score[2])) result = sorted(result, reverse=True, key=lambda x: x[3]) return result
accuracy5 = clf5.score(X_test,y_test)
clf6.fit(X_train,y_train)
accuracy6 = clf6.score(X_test,y_test)
clf7.fit(X_train,y_train)
accuracy7 = clf7.score(X_test,y_test)
clf8.fit(X_train,y_train)
accuracy8 = clf8.score(X_test,y_test)
print(accuracy1,accuracy2,accuracy3,accuracy4,accuracy5,accuracy6,accuracy7,accuracy8)
from sklearn.naive_bayes import GaussianNB
clfnb = GaussianNB()
clfnb.fit(X_train, y_train)
accuracyNB = clfnb.score(X_test,y_test)
print("In Gaussian NB")
print (accuracyNB)
##WITH TruncatedSVD + KNN
from sklearn.decomposition import PCA, FastICA,TruncatedSVD
from sklearn.pipeline import Pipeline
trun = TruncatedSVD()
dm_reductions = [trun]
clf_details = [clf]
estimators = [('dm_reduce', trun), ('clf', clf)]
pipeline = Pipeline(estimators)
best_pipe = pipeline.fit(X_train, y_train)
n = [1500,5000,7000,10000,20000]
y_data[y_data == 6] = 0
y_data[y_data == 7] = 1
y_data[y_data == 8] = 1
y_data[y_data == 9] = 2
y_data[y_data == 10] = 2
df = pd.DataFrame(y_data)
fs = []
acc = []
df=df.astype('int')
genes_transpose = np.transpose(x_data)
for i in range(0,5):
X_new = SelectKBest(chi2, k=n[i]).fit_transform(genes_transpose, df)
classifier = GaussianNB()
X_train, X_test,y_train,y_test = train_test_split(X_new,df,test_size=0.3)
classifier.fit(X_train,y_train)
y_pred = classifier.predict(X_test)
cnf_matrix = confusion_matrix(y_test, y_pred)
cnf_matrix.astype(float)
FP = cnf_matrix.sum(axis=0) - np.diag(cnf_matrix)
FN = cnf_matrix.sum(axis=1) - np.diag(cnf_matrix)
TP = np.diag(cnf_matrix)
TN = cnf_matrix.sum() - (FP + FN + TP)
FP = FP.astype('float')
FN = FN.astype('float')
TP = TP.astype('float')
TN = TN.astype('float')
# Sensitivity, hit rate, recall, or true positive rate
TPR = TP/(TP+FN)
# Specificity or true negative rate
TNR = TN/(TN+FP)
Y = df.iloc[:, -1] # Encoding categorical values X = pd.get_dummies(X, columns=['Gender'], drop_first=True) # Train-Test-Split X_train = X.sample(frac=0.8, random_state=1) X_test = X.drop(X_train.index) Y_test = Y.drop(X_train.index) Y_train = Y.drop(Y_test.index) X_train = X_train.sort_index() # Scaling values from sklearn.preprocessing import StandardScaler Sc_X = StandardScaler() X_train = Sc_X.fit_transform(X_train) X_test = Sc_X.transform(X_test) # Making a Naive Bayes Classifier from sklearn.naive_bayes import GaussianNB clf = GaussianNB() clf.fit(X_train, Y_train) Y_pred = clf.predict(X_test) from sklearn.metrics import confusion_matrix c_m = confusion_matrix(Y_test, Y_pred) print(c_m)
def domestic_model_initialise():
connection = pymysql.connect(host='localhost',
user='******',
password='',
db='crickml',
charset='utf8mb4',
cursorclass=pymysql.cursors.DictCursor)
try:
with connection.cursor() as cursor:
# Read a single record
sql = "SELECT * FROM `domestic_stats`"
cursor.execute(sql)
result = cursor.fetchall()
player_list = []
for player in result:
career_score = batsmen_model(player['overall_matches'],
player['overall_innings'],
player['overall_average'],
player['overall_100s'],
player['overall_50s'])
player_list.append([
player['overall_average'] * player['overall_strike_rate'],
career_score
])
with connection.cursor() as cursor:
# Read a single record
sql = "SELECT * FROM `domestic_stats`"
cursor.execute(sql)
result = cursor.fetchall()
intl_performance_list = []
performance_list = []
for player in result:
performance_score = batsmen_performance_model(
player['intl_matches'], player['intl_innings'],
player['intl_average'], player['intl_100s'],
player['intl_50s'])
intl_performance_list.append([performance_score])
finally:
print('done')
# return pre_performance
np_intl_performances_list = np.array(intl_performance_list)
mean_performance = sum(
np_intl_performances_list[:, 0]) / len(np_intl_performances_list)
for performance in intl_performance_list:
if (performance <= mean_performance):
performance_list.append(0)
else:
performance_list.append(1)
# finally:
# connection.close()
# # print(np_players)
np_players = np.array(player_list)
np_players = np_players.astype(float)
np_performances = np.array(performance_list)
max_batting_pos = np.max(np_players[:, 0])
max_milestone_score = np.max(np_players[:, 1])
for player in np_players:
batting_pos_score = player[0]
batting_milestone_score = player[1]
# batting_runs_score = player[2]
# print(batting_pos_score)
# print(max_batting_pos)
normalized_batting_pos_score = batting_pos_score / max_batting_pos
normalized_batting_milestone_score = batting_milestone_score / max_milestone_score
# normalized_runs_score = batting_runs_score/max_runs_score
# print(normalized_batting_pos_score)
# exit()
player[0] = normalized_batting_pos_score
player[1] = normalized_batting_milestone_score
# player[2] = normalized_runs_score
sm = SMOTE(random_state=42)
np_players_resampled, np_performances_resampled = sm.fit_resample(
np_players, np_performances)
feature_train, feature_test, target_train, target_test = train_test_split(
np_players_resampled,
np_performances_resampled,
test_size=0.20,
random_state=42)
print("Training Domestoc Models")
print(feature_test)
svm_clf = SVC(C=1000, kernel='sigmoid', gamma=0.001, probability=True)
svm_clf.fit(feature_train, target_train)
svm_pred = svm_clf.predict(feature_test)
svm_pred_prob = svm_clf.predict_proba(feature_test)
# print(svm_pred_prob)
# acc = accuracy_score(svm_pred, target_test)
# print('Accuracy :', acc)
# print(classification_report(target_test, svm_pred))
gnb = GaussianNB()
gnb.fit(feature_train, target_train)
nb_pred_prob = gnb.predict_proba(feature_test)
nb_pred = gnb.predict(feature_test)
# acc = accuracy_score(nb_pred, target_test)
# print('Accuracy :', acc)
# print(classification_report(target_test, nb_pred))
desT = DecisionTreeClassifier()
desT.fit(feature_train, target_train)
desc_pred = desT.predict(feature_test)
desc_pred_prob = desT.predict_proba(feature_test)
mlp_clf = MLPClassifier(solver='lbfgs',
alpha=1e-5,
hidden_layer_sizes=(5, 2),
random_state=1)
mlp_clf.fit(feature_train, target_train)
mlp_pred_prob = mlp_clf.predict_proba(feature_test)
mlp_pred = mlp_clf.predict(feature_test)
# acc = accuracy_score(desc_pred, target_test)
# print('Accuracy :', acc)
# print(classification_report(target_test, desc_pred))
miss_nb = 0
for index, pred in enumerate(nb_pred):
if (pred != target_test[index]):
miss_nb += 1
amt_say_nb = 1 / 2 * (math.log((1 - (miss_nb / 119)) / (miss_nb / 119)))
miss_mlp = 0
for index, pred in enumerate(mlp_pred):
if (pred != target_test[index]):
miss_mlp += 1
amt_say_mlp = 1 / 2 * (math.log((1 - (miss_mlp / 119)) / (miss_mlp / 119)))
miss_svm = 0
for index, pred in enumerate(svm_pred):
if (pred != target_test[index]):
miss_svm += 1
amt_say_svm = 1 / 2 * (math.log((1 - (miss_svm / 119)) / (miss_svm / 119)))
miss_desc = 0
for index, pred in enumerate(desc_pred):
if (pred != target_test[index]):
miss_desc += 1
amt_say_desc = 1 / 2 * (math.log(
(1 - (miss_desc / 119)) / (miss_desc / 119)))
print('Amount of say NB :', amt_say_nb)
print('Amount of say MLP :', amt_say_mlp)
print('Amount of say SVM :', amt_say_svm)
print('Amount of say Descision Tree :', amt_say_desc)
return connection, gnb, mlp_clf, svm_clf, desT, amt_say_desc, amt_say_mlp, amt_say_nb, amt_say_svm, max_batting_pos, max_milestone_score, feature_train, feature_test, target_train, target_test
X=[]
Y=[]
i=0
with open(sys.argv[1], "r") as ins:
for line in ins:
line = line.strip()
line1 = line.split(',')
if(i==0):
i+=1
continue
X.append(map(int,line1[:-1]))
Y.append(int(line1[-1]))
clf = GaussianNB()
clf.fit(X, Y)
already = "../../Suites/Ccausalmarital"
num_atr=[10,8,70,16,7,14,6,5,2,100,40,100,40]
map={}
def check_ratio(fixed,clf):
if option==3 or option==4:
fin = open(already,"r")
requeried={}
num=0
den=0
for line in fin:
line = line.strip()
line = line.split(',')
line = line[:-1]
i=0
pos=0
Y = [
'male', 'female', 'female', 'female', 'male', 'male', 'male', 'female',
'male', 'female', 'male'
]
#classifiers
clf_tree = tree.DecisionTreeClassifier()
clf_svc = svm.SVC()
clf_KNN = KNeighborsClassifier()
clf_NB = GaussianNB()
#training the models
clf_tree = clf_tree.fit(X, Y)
clf_svc = clf_svc.fit(X, Y)
clf_KNN = clf_KNN.fit(X, Y)
clf_NB = clf_NB.fit(X, Y)
prediction_tree = clf_tree.predict(X)
prediction_svc = clf_svc.predict(X)
prediction_KNN = clf_KNN.predict(X)
prediction_NB = clf_NB.predict(X)
result = accuracy_score(Y, prediction_tree)
result1 = accuracy_score(Y, prediction_svc)
result2 = accuracy_score(Y, prediction_KNN)
result3 = accuracy_score(Y, prediction_NB)
print(result)
print(result1)
print(result2)
print(result3)
#OUTPUT:- #MODEL-1: Accuracy of LogisticRegression : 77.09 #MODEL-2) Gaussian Naive Bayes #------------------------------------------ from sklearn.naive_bayes import GaussianNB gaussian = GaussianNB() gaussian.fit(x_train, y_train) y_pred = gaussian.predict(x_val) acc_gaussian = round(accuracy_score(y_pred, y_val) * 100, 2) print( "MODEL-2: Accuracy of GaussianNB : ", acc_gaussian ) #OUTPUT:- #MODEL-2: Accuracy of GaussianNB : 78.68 #MODEL-3) Support Vector Machines #------------------------------------------ from sklearn.svm import SVC svc = SVC()
#Import Library of Gaussian Naive Bayes model
from sklearn.naive_bayes import GaussianNB
import numpy as np
#assigning predictor and target variables
x = np.array([[-3, 7], [1, 5], [1, 2], [-2, 0], [2, 3], [-4, 0], [-1, 1],
[1, 1], [-2, 2], [2, 7], [-4, 1], [-2, 7]])
Y = np.array([3, 3, 3, 3, 4, 3, 3, 4, 3, 4, 4, 4])
#Create a Gaussian Classifier
model = GaussianNB()
# Train the model using the training sets
model.fit(x, Y)
#Predict Output
predicted = model.predict([[1, 2], [3, 4]])
print(predicted)
def analysis():
(train_original, test_original, full_data) = featureextraction(False)
for i in range(5):
test = train_original.iloc[178*i:178*(i+1),:].copy()
test = test.drop(labels=["Survived"],axis = 1)
train = train_original.loc[~train_original['PassengerId'].isin(test['PassengerId'])]
X_train = train.drop("Survived", axis=1)
X_train = X_train.drop("PassengerId", axis=1).copy()
Y_train = train["Survived"]
X_test = test.drop("PassengerId", axis=1).copy()
X_train.shape, Y_train.shape, X_test.shape
logreg = LogisticRegression()
logreg.fit(X_train, Y_train)
Y_pred = logreg.predict(X_test)
acc_log = round(logreg.score(X_train, Y_train) * 100, 2)
print('Logistic regression:',acc_log,'%')
svc = SVC()
svc.fit(X_train, Y_train)
Y_pred = svc.predict(X_test)
acc_svc = round(svc.score(X_train, Y_train) * 100, 2)
print('SVC:',acc_svc,'%')
for k in range(3,8,2):
knn = KNeighborsClassifier(n_neighbors = k)
knn.fit(X_train, Y_train)
Y_pred = knn.predict(X_test)
acc_knn = round(knn.score(X_train, Y_train) * 100, 2)
print('%s KNeighbors:'%k,acc_knn,'%')
decision_tree = DecisionTreeClassifier()
decision_tree.fit(X_train, Y_train)
Y_pred = decision_tree.predict(X_test)
acc_decision_tree = round(decision_tree.score(X_train, Y_train) * 100, 2)
print('Decision Tree:',acc_decision_tree,'%')
random_forest = RandomForestClassifier(n_estimators=100)
random_forest.fit(X_train, Y_train)
Y_pred = random_forest.predict(X_test)
random_forest.score(X_train, Y_train)
acc_random_forest = round(random_forest.score(X_train, Y_train) * 100, 2)
print('Random Forest:',acc_random_forest,'%')
Naive_bayes = GaussianNB()
Naive_bayes.fit(X_train, Y_train)
Y_pred = Naive_bayes.predict(X_test)
Naive_bayes.score(X_train, Y_train)
acc_Naive_bayes = round(Naive_bayes.score(X_train, Y_train) * 100, 2)
print('Naive Bayes:',acc_Naive_bayes,'%')
MLP = MLPClassifier(hidden_layer_sizes=(15,15,15))
MLP.fit(X_train, Y_train)
Y_pred = MLP.predict(X_test)
MLP.score(X_train, Y_train)
acc_MLP = round(MLP.score(X_train, Y_train) * 100, 2)
print('MLP:',acc_MLP,'%')
print('\n')
X_train = train_original.drop("Survived", axis=1)
X_train = X_train.drop("PassengerId", axis=1)
Y_train = train_original["Survived"]
X_test = test_original.drop("PassengerId", axis=1).copy()
X_train.shape, Y_train.shape, X_test.shape
Submission_classifier = KNeighborsClassifier(n_neighbors = 7)
Submission_classifier.fit(X_train, Y_train)
Y_pred = Submission_classifier.predict(X_test)
Submission_classifier.score(X_train, Y_train)
Submission_classifier_score = round(Submission_classifier.score(X_train, Y_train) * 100, 2)
submission = pd.DataFrame({
"PassengerId": test_original["PassengerId"],
"Survived": Y_pred.astype(int)
})
submission.to_csv('submission_KNN_2.csv', index=False)
print('Submission accuracy:',Submission_classifier_score,'%')
def trainModel(X, results):
print 'Building model...'
clf = GaussianNB()
clf.fit(X, results)
return clf
my_data = pd.read_csv('C:\Projects\ML-BinaryClassification\iris\Iris.csv')
#split the dataset into features and labels
features = my_data.iloc[:, :5]
labels = my_data[my_data.columns[-1]]
# Split our data
train, test, train_labels, test_labels = train_test_split(features,
labels,
test_size=0.20,
random_state=42)
#print(test_labels)
#print (features)
#print (labels)
# Initialize our classifier
gnb = GaussianNB()
# Train our classifier
model = gnb.fit(train, train_labels)
# Make predictions
print(test)
preds = gnb.predict(test)
print(preds)
# Evaluate accuracy
print(accuracy_score(test_labels, preds))
# train and test dataset splitting
from sklearn.model_selection import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X,
y,
test_size=0.25,
random_state=0)
#feature scaler
from sklearn.preprocessing import StandardScaler
SS_X = StandardScaler()
X_train = SS_X.fit_transform(X_train)
X_test = SS_X.transform(X_test)
#fitting logistic regression to the training data set
from sklearn.naive_bayes import GaussianNB
gnb = GaussianNB()
gnb.fit(X_train, y_train)
#predicting the trest set results
y_pred = gnb.predict(X_test)
# Visualising the Training set results
from matplotlib.colors import ListedColormap
X_set, y_set = X_train, y_train
X1 = np.arange(start=X_set[:, 0].min() - 1,
stop=X_set[:, 0].max() + 1,
step=0.01)
X2 = np.arange(start=X_set[:, 1].min() - 1,
stop=X_set[:, 1].max() + 1,
step=0.01)
X1, X2 = np.meshgrid(X1, X2)
plt.contourf(X1,
######################################### - Fitting Model- ########################################### # Model 1 # Multinomial Naive Bayes smnb = MultinomialNB() smnb.fit(X_train_count,y_train) ## Multinomial Model Accuracy smnb.score(X_train_count,y_train) # 0.99 smnb.score(X_test_count,y_test) # 0.98 # Model 2 # Gaussian Naive Bayes sgnb = GaussianNB() sgnb.fit(X_train_count_array,y_train) ## Gaussian Model Accuracy sgnb.score(X_train_count_array,y_train) # 0.90 sgnb.score(X_test_count_array,y_test) # 0.85 # From Above we can Conclude that Multinomial Naive Bayes Model gives us best result. So we are using it for future Predication. # Prediction on Train & Test Data pred_train = smnb.predict(X_train_count) pred_test = smnb.predict(X_test_count) # Confusion matrix of Train and Test ## Train confusion_matrix_train = pd.crosstab(y_train,pred_train,rownames=['Actual'],colnames= ['Train Predictions']) sns.heatmap(confusion_matrix_train, annot = True, cmap = 'Blues',fmt='g')
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
from sklearn.naive_bayes import GaussianNB
dataset = pd.read_csv("../datasheets/projection.csv")
cases = np.array(dataset.india.values.tolist()) # y
days = list(range(1, (len(cases) + 1))) # X
days = np.array([[day] for day in days])
days_pred = list(range(1, (len(cases) + 5)))
days_pred = np.array([[day] for day in days_pred])
clf = GaussianNB()
clf.fit(days, cases)
print(clf.predict(days_pred))
"""우리는 Feature 중 sepal에 관련된 두 개의 feature만 이용해서 학습할 것이다. 따라서 이외의 feature는 제거해준다. 그리고 target 값은 현재의 string에서 숫자로 변환해준다.
그 후 격자 안의 모든 점을 가우시안 나이브 베이즈 모델을 이용하여 예측하고 해당 예측을 통해서 decision boundary를 visualization해준다. 결과는 아래와 같다.
"""
import matplotlib.colors as colors
from sklearn.naive_bayes import GaussianNB
df1 = iris_frame[["sepal length (cm)", "sepal width (cm)", "target"]]
X = df1.iloc[:, 0:2]
Y = df1.iloc[:, 2].replace({
'setosa': 0,
'versicolor': 1,
'virginica': 2
}).copy()
NB = GaussianNB()
NB.fit(X, Y)
N = 100
X_ = np.linspace(4, 8, N)
Y_ = np.linspace(1.5, 5, N)
X_, Y_ = np.meshgrid(X_, Y_)
color_list = ['Blues', 'Greens', 'Reds']
my_norm = colors.Normalize(vmin=-1, vmax=1)
g = sn.FacetGrid(iris_frame, hue="target", size=10, palette='colorblind').map(
plt.scatter,
"sepal length (cm)",
"sepal width (cm)",
).add_legend()
my_ax = g.ax
print('Empirical learning curve for RF generated')
X, Y = ([] for i in range(2))
test_label = [train_label[i] for i in range(len(test_data))]
original_test_data = np.array(test_data) # same for every iteration
clf = GaussianNB()
for sample_size in range(1, len(train_label) / CIGTOTAL):
# train with given sample size
X.append(sample_size)
train_subset_label = [
train_label[i] for i in range(CIGTOTAL * sample_size)
]
train_subset_data = [train_data[i] for i in range(CIGTOTAL * sample_size)]
train_subset_label = np.array(train_subset_label)
train_subset_data = np.array(train_subset_data)
clf.fit(train_subset_data, train_subset_label)
# test the trained classifier
predict = clf.predict(original_test_data)
Y.append(getY(predict, test_label))
fig, ax = plt.subplots(1, figsize=(11, 8))
ax.plot(X, Y)
plt.xticks(np.arange(1, len(train_label) / CIGTOTAL, 1.))
plt.xlabel('sample size')
plt.ylabel('accuracy')
plt.title('Empirical Gaussian NB learning curve for Halo, Juul, Blu, and V2')
fig.savefig('2_ss_lc/nb_lc.png')
plt.show()
class EndgamePredictor():
def __init__(self):
data = pd.read_csv('CheckEndgame.csv')
data["Pieces"] = data.apply(
lambda row: self.gettotalpieces(chess.Board(row["FEN"])), axis=1)
data["Material"] = data.apply(
lambda row: self.gettotalmaterial(chess.Board(row["FEN"])), axis=1)
data["Major Pieces"] = data.apply(
lambda row: self.getmajorpieces(chess.Board(row["FEN"])), axis=1)
x = data[['Pieces', 'Material', 'Major Pieces']]
y = data.Endgame
self.model = GaussianNB()
self.model.fit(x, y)
def is_endgame(self, fen: str):
board = chess.Board(fen)
arr = np.array([
self.gettotalpieces(board),
self.gettotalmaterial(board),
self.getmajorpieces(board)
])
result = self.model.predict(arr.reshape(-1, 1))
if (result.any()):
return True
else:
return False
def gettotalmaterial(self, board: chess.Board):
i = 0
valfinder = SquareValue()
material = 0
while (i < 64):
piece = board.piece_at(i)
if (piece):
if ((piece.piece_type > 1) and (piece.piece_type < 6)):
material += abs(
valfinder.getpiecevalue(i, chess.WHITE, piece, True))
i += 1
return material
def gettotalpieces(self, board: chess.Board):
i = 0
pieces = 0
while (i < 64):
piece = board.piece_at(i)
if (piece):
pieces += 1
i += 1
return pieces - 2
def getmajorpieces(self, board: chess.Board):
i = 0
pieces = 0
while (i < 64):
piece = board.piece_at(i)
if (piece):
if ((piece.piece_type > 1) and (piece.piece_type < 6)):
pieces += 1
i += 1
return pieces
y_data = y_data.reset_index(drop=True)
print('\nPre-processing Done.')
print('\nCount of different classes in Train set:')
print(X_train['Class'].value_counts())
print('\nCount of different classes in Test set:')
print(X_test['Class'].value_counts())
feats=[c for c in X_train.columns if c!='Class']
# Train classifier
print('\nImplementing Gaussian Naive Bayes Model.')
gnb = GaussianNB()
gnb.fit(
X_train[feats].values,
y_train['Class']
)
y_pred = gnb.predict(X_test[feats].values)
print("\nNumber of mislabeled points out of a total {} points : {}, Accuracy: {:05.5f}%"
.format(
X_test.shape[0],
(X_test["Class"] != y_pred).sum(),
100*(1-(X_test["Class"] != y_pred).sum()/X_test.shape[0])
))
cv = KFold(n_splits=5)
clf = GaussianNB()
X_data=X_data.values
y_data=y_data.values
def result():
if request.method == 'POST':
path = request.files.get('myFile')
df = pd.read_csv(path, encoding="ISO-8859-1")
filename = request.form['filename']
str1 = request.form['feature']
str2 = request.form['label']
if str1 in list(df) and str2 in list(df):
y = df[str2]
X = df[str1]
else:
return render_template('nameError.html')
x = []
for subject in X:
result = re.sub(r"http\S+", "", subject)
replaced = re.sub(r'[^a-zA-Z0-9 ]+', '', result)
x.append(replaced)
X = pd.Series(x)
X = X.str.lower()
"""
texts = []
for doc in X:
doc = nlp(doc, disable=['parser', 'ner'])
tokens = [tok.lemma_.lower().strip() for tok in doc if tok.lemma_ != '-PRON-']
tokens = [tok for tok in tokens if tok not in stopwords]
tokens = ' '.join(tokens)
texts.append(tokens)
X = pd.Series(texts)
"""
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.33, shuffle=True)
tfidfvect = TfidfVectorizer(ngram_range=(1, 1))
X_train_tfidf = tfidfvect.fit_transform(X_train)
start = time()
clf1 = LinearSVC()
clf1.fit(X_train_tfidf, y_train)
pred_SVC = clf1.predict(tfidfvect.transform(X_test))
a1 = accuracy_score(y_test, pred_SVC)
end = time()
print("accuracy SVC: {} and time: {} s".format(a1, (end - start)))
start = time()
clf2 = LogisticRegression(n_jobs=-1, multi_class='multinomial', solver='newton-cg')
clf2.fit(X_train_tfidf, y_train)
pred_LR = clf2.predict(tfidfvect.transform(X_test))
a2 = accuracy_score(y_test, pred_LR)
end = time()
print("accuracy LR: {} and time: {}".format(a2, (end - start)))
start = time()
clf3 = RandomForestClassifier(n_jobs=-1)
clf3.fit(X_train_tfidf, y_train)
pred = clf3.predict(tfidfvect.transform(X_test))
a3 = accuracy_score(y_test, pred)
end = time()
print("accuracy RFC: {} and time: {}".format(a3, (end - start)))
start = time()
clf4 = MultinomialNB()
clf4.fit(X_train_tfidf, y_train)
pred = clf4.predict(tfidfvect.transform(X_test))
a4 = accuracy_score(y_test, pred)
end = time()
print("accuracy MNB: {} and time: {}".format(a4, (end - start)))
start = time()
clf5 = GaussianNB()
clf5.fit(X_train_tfidf.toarray(), y_train)
pred = clf5.predict(tfidfvect.transform(X_test).toarray())
a5 = accuracy_score(y_test, pred)
end = time()
print("accuracy GNB: {} and time: {}".format(a5, (end - start)))
start = time()
clf6 = LogisticRegressionCV(n_jobs=-1)
clf6.fit(X_train_tfidf, y_train)
pred_LR = clf6.predict(tfidfvect.transform(X_test))
a6 = accuracy_score(y_test, pred_LR)
end = time()
print("accuracy LRCV: {} and time: {}".format(a6, (end - start)))
start = time()
clf7 = AdaBoostClassifier()
clf7.fit(X_train_tfidf, y_train)
pred_LR = clf7.predict(tfidfvect.transform(X_test))
a7 = accuracy_score(y_test, pred_LR)
end = time()
print("accuracy ABC: {} and time: {}".format(a7, (end - start)))
start = time()
clf8 = BernoulliNB()
clf8.fit(X_train_tfidf.toarray(), y_train)
pred = clf8.predict(tfidfvect.transform(X_test).toarray())
a8 = accuracy_score(y_test, pred)
end = time()
print("accuracy BNB: {} and time: {}".format(a8, (end - start)))
start = time()
clf9 = Perceptron(n_jobs=-1)
clf9.fit(X_train_tfidf.toarray(), y_train)
pred = clf9.predict(tfidfvect.transform(X_test).toarray())
a9 = accuracy_score(y_test, pred)
end = time()
print("accuracy Per: {} and time: {}".format(a9, (end - start)))
start = time()
clf10 = RidgeClassifierCV()
clf10.fit(X_train_tfidf.toarray(), y_train)
pred = clf10.predict(tfidfvect.transform(X_test).toarray())
a10 = accuracy_score(y_test, pred)
end = time()
print("accuracy RidCV: {} and time: {}".format(a10, (end - start)))
start = time()
clf11 = SGDClassifier(n_jobs=-1)
clf11.fit(X_train_tfidf.toarray(), y_train)
pred = clf11.predict(tfidfvect.transform(X_test).toarray())
a11 = accuracy_score(y_test, pred)
end = time()
print("accuracy SGDC: {} and time: {}".format(a11, (end - start)))
start = time()
clf12 = SGDClassifier(n_jobs=-1)
clf12.fit(X_train_tfidf.toarray(), y_train)
pred = clf12.predict(tfidfvect.transform(X_test).toarray())
a12 = accuracy_score(y_test, pred)
end = time()
print("accuracy XGBC: {} and time: {}".format(a12, (end - start)))
acu_list = [a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12]
max_list = max(acu_list)
if max_list == a1:
pickle.dump(clf1, open(filename + '_model', 'wb'))
elif max_list == a2:
pickle.dump(clf2, open(filename + '_model', 'wb'))
elif max_list == a3:
pickle.dump(clf3, open(filename + '_model', 'wb'))
elif max_list == a4:
pickle.dump(clf4, open(filename + '_model', 'wb'))
elif max_list == a5:
pickle.dump(clf5, open(filename + '_model', 'wb'))
elif max_list == a6:
pickle.dump(clf6, open(filename + '_model', 'wb'))
elif max_list == a7:
pickle.dump(clf7, open(filename + '_model', 'wb'))
elif max_list == a8:
pickle.dump(clf8, open(filename + '_model', 'wb'))
elif max_list == a9:
pickle.dump(clf9, open(filename + '_model', 'wb'))
elif max_list == a10:
pickle.dump(clf10, open(filename + '_model', 'wb'))
elif max_list == a11:
pickle.dump(clf11, open(filename + '_model', 'wb'))
elif max_list == a12:
pickle.dump(clf12, open(filename + '_model', 'wb'))
pickle.dump(tfidfvect, open(filename + '_tfidfVect', 'wb'))
return render_template("result.html", ac1=a1, ac2=a2, ac3=a3, ac4=a4, ac5=a5, ac6=a6, ac7=a7, ac8=a8, ac9=a9,
ac10=a10, ac11=a11, ac12=a12)
X_train = np.empty(shape=(len(Li), len(feature_dict) + 3))
Y_train = np.empty(shape=len(Li))
for i in range(len(Li)):
#print(Li[i])
List = tokenize(Li[i][0])
# score_snippet(List,dal)
X_train[i] = get_features(List)
Y_train[i] = Li[i][1]
# for i in range(len(Li)):
# #print(Li[i])
# print(X_train[i],":",Y_train[i])
normalized_X = (normalize(X_train))
clf = GaussianNB()
clf.fit(normalized_X, Y_train)
clf_lr = LogisticRegression()
clf_lr.fit(normalized_X, Y_train)
Li_test = load_corpus("/Users/sravyakurra/Desktop/NLP/HW@2/test.txt")
X_test = np.empty(shape=(len(Li_test), len(feature_dict) + 3))
Y_test = np.empty(shape=len(Li_test))
for i in range(len(Li_test)):
#print(Li[i])
List = tokenize(Li_test[i][0])
X_test[i] = get_features(List)
Y_test[i] = Li_test[i][1]
#print(X_test)
#print("hiii")
class Model_Finder:
"""
This class shall be used to find the model with best accuracy and AUC score.
"""
def __init__(self, file_object, logger_object):
self.file_object = file_object
self.logger_object = logger_object
self.gnb = GaussianNB()
self.xgb = XGBClassifier(objective='binary:logistic', n_jobs=-1)
def get_best_params_for_naive_bayes(self, train_x, train_y):
"""
Method Name: get_best_params_for_naive_bayes
Description: get the parameters for the Naive Bayes's Algorithm which give the best accuracy.
Use Hyper Parameter Tuning.
Output: The model with the best parameters
On Failure: Raise Exception
"""
self.logger_object.log(
self.file_object,
'Entered the get_best_params_for_naive_bayes method of the Model_Finder class'
)
try:
# initializing with different combination of parameters
self.param_grid = {
"var_smoothing": [
1e-9, 0.1, 0.001, 0.5, 0.05, 0.01, 1e-8, 1e-7, 1e-6, 1e-10,
1e-11
]
}
#Creating an object of the Grid Search class
self.grid = GridSearchCV(estimator=self.gnb,
param_grid=self.param_grid,
cv=3,
verbose=3)
#finding the best parameters
self.grid.fit(train_x, train_y)
#extracting the best parameters
self.var_smoothing = self.grid.best_params_['var_smoothing']
#creating a new model with the best parameters
self.gnb = GaussianNB(var_smoothing=self.var_smoothing)
# training the mew model
self.gnb.fit(train_x, train_y)
self.logger_object.log(
self.file_object,
'Naive Bayes best params: ' + str(self.grid.best_params_) +
'. Exited the get_best_params_for_naive_bayes method of the Model_Finder class'
)
return self.gnb
except Exception as e:
self.logger_object.log(
self.file_object,
'Exception occured in get_best_params_for_naive_bayes method of the Model_Finder class. Exception message: '
+ str(e))
self.logger_object.log(
self.file_object,
'Naive Bayes Parameter tuning failed. Exited the get_best_params_for_naive_bayes method of the Model_Finder class'
)
raise Exception()
def get_best_params_for_xgboost(self, train_x, train_y):
"""
Method Name: get_best_params_for_xgboost
Description: get the parameters for XGBoost Algorithm which give the best accuracy.
Use Hyper Parameter Tuning.
Output: The model with the best parameters
On Failure: Raise Exception
"""
self.logger_object.log(
self.file_object,
'Entered the get_best_params_for_xgboost method of the Model_Finder class'
)
try:
# initializing with different combination of parameters
self.param_grid_xgboost = {
"n_estimators": [50, 100, 130],
"max_depth": range(3, 11, 1),
"random_state": [0, 50, 100]
}
# Creating an object of the Grid Search class
self.grid = GridSearchCV(
XGBClassifier(objective='binary:logistic'),
self.param_grid_xgboost,
verbose=3,
cv=2,
n_jobs=-1)
# finding the best parameters
self.grid.fit(train_x, train_y)
# extracting the best parameters
self.random_state = self.grid.best_params_['random_state']
self.max_depth = self.grid.best_params_['max_depth']
self.n_estimators = self.grid.best_params_['n_estimators']
# creating a new model with the best parameters
self.xgb = XGBClassifier(random_state=self.random_state,
max_depth=self.max_depth,
n_estimators=self.n_estimators,
n_jobs=-1)
# training the mew model
self.xgb.fit(train_x, train_y)
self.logger_object.log(
self.file_object,
'XGBoost best params: ' + str(self.grid.best_params_) +
'. Exited the get_best_params_for_xgboost method of the Model_Finder class'
)
return self.xgb
except Exception as e:
self.logger_object.log(
self.file_object,
'Exception occured in get_best_params_for_xgboost method of the Model_Finder class. Exception message: '
+ str(e))
self.logger_object.log(
self.file_object,
'XGBoost Parameter tuning failed. Exited the get_best_params_for_xgboost method of the Model_Finder class'
)
raise Exception()
def get_best_model(self, train_x, train_y, test_x, test_y):
"""
Method Name: get_best_model
Description: Find out the Model which has the best AUC score.
Output: The best model name and the model object
On Failure: Raise Exception
"""
self.logger_object.log(
self.file_object,
'Entered the get_best_model method of the Model_Finder class')
# create best model for XGBoost
try:
self.xgboost = self.get_best_params_for_xgboost(train_x, train_y)
self.prediction_xgboost = self.xgboost.predict(
test_x) # Predictions using the XGBoost Model
if len(
test_y.unique()
) == 1: #if there is only one label in y, then roc_auc_score returns error. We will use accuracy in that case
self.xgboost_score = accuracy_score(test_y,
self.prediction_xgboost)
self.logger_object.log(self.file_object,
'Accuracy for XGBoost:' +
str(self.xgboost_score)) # Log AUC
else:
self.xgboost_score = roc_auc_score(
test_y, self.prediction_xgboost) # AUC for XGBoost
self.logger_object.log(self.file_object, 'AUC for XGBoost:' +
str(self.xgboost_score)) # Log AUC
# create best model for Random Forest
self.naive_bayes = self.get_best_params_for_naive_bayes(
train_x, train_y)
self.prediction_naive_bayes = self.naive_bayes.predict(
test_x) # prediction using the Random Forest Algorithm
if len(
test_y.unique()
) == 1: #if there is only one label in y, then roc_auc_score returns error. We will use accuracy in that case
self.naive_bayes_score = accuracy_score(
test_y, self.prediction_naive_bayes)
self.logger_object.log(
self.file_object,
'Accuracy for NB:' + str(self.naive_bayes_score))
else:
self.naive_bayes_score = roc_auc_score(
test_y,
self.prediction_naive_bayes) # AUC for Random Forest
self.logger_object.log(
self.file_object,
'AUC for RF:' + str(self.naive_bayes_score))
#comparing the two models
if (self.naive_bayes_score < self.xgboost_score):
return 'XGBoost', self.xgboost
else:
return 'NaiveBayes', self.naive_bayes
except Exception as e:
self.logger_object.log(
self.file_object,
'Exception occured in get_best_model method of the Model_Finder class. Exception message: '
+ str(e))
self.logger_object.log(
self.file_object,
'Model Selection Failed. Exited the get_best_model method of the Model_Finder class'
)
raise Exception()
class NaiveBayes:
def __init__(self,
features={},
split=0.8,
distribution="Bernoulli",
isSummary=False):
self.Tags = [
"OTH", "BKG", "CTR", "NA", "AIM", "OWN", "BAS", "TXT", "", "BEGIN"
]
self.Locations = [
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"
]
self.ParaLocations = ["INITIAL", "MEDIAL", "FINAL"]
self.Headlines = [
"Introduction", "Implementation", "Example", "Conclusion",
"Result", "Evaluation", "Solution", "Discussion", "Further Work",
"Data", "Related Work", "Experiment", "Problems", "Method",
"Problem Statement", "Non-Prototypical"
]
self.YESorNO = ["YES", "NO"]
self.SecLocations = [
"FIRST", "SECOND", "THIRD", "LAST", "SECOND-LAST", "THIRD-LAST",
"SOMEWHERE"
]
self.Tenses = ["PRESENT", "PAST", "FUTURE", "NOVERB"]
self.Modals = ["MODAL", "NOMODAL", "NOVERB"]
self.Voices = ["Active", "Passive", "NOVERB"]
self.isSummary = isSummary
self.features = features
self.transformFeatures()
self.distribution = distribution
self.split = split
self.splitData()
def reloadDis(self):
if self.distribution == "Bernoulli":
self.nb = BernoulliNB()
elif self.distribution == "Multinomial":
self.nb = MultinomialNB()
elif self.distribution == "Complement":
self.nb = ComplementNB()
else:
self.nb = GaussianNB()
def splitData(self):
if not self.isSummary:
print "Data split between train and test: " + str(self.split)
papers = self.features.keys()
order = np.random.permutation(len(papers))
self.train_papers = []
for i in range(int(self.split * len(papers))):
self.train_papers.append(papers[order[i]])
self.test_papers = []
for i in range(int(self.split * len(papers)) + 1, len(papers)):
self.test_papers.append(papers[order[i]])
self.train_X, self.train_y = self.getFeatures(self.train_papers)
self.test_X, self.test_y = self.getFeatures(self.test_papers)
def transformFeatures(self):
self.transformed_features = dict()
for filename in self.features.keys():
self.transformed_features[filename] = dict()
for sentId in self.features[filename].keys():
self.transformed_features[filename][sentId] = dict()
self.transformed_features[filename][sentId][
'loc'] = self.Locations.index(
self.features[filename][sentId]['loc'])
self.transformed_features[filename][sentId][
'parloc'] = self.ParaLocations.index(
self.features[filename][sentId]['parloc'])
self.transformed_features[filename][sentId][
'val'] = self.Tags.index(
self.features[filename][sentId]['val'])
self.transformed_features[filename][sentId][
'Title'] = self.YESorNO.index(
self.features[filename][sentId]['Title'])
self.transformed_features[filename][sentId][
'len'] = self.YESorNO.index(
self.features[filename][sentId]['len'])
self.transformed_features[filename][sentId][
'tfidf'] = self.YESorNO.index(
self.features[filename][sentId]['tfidf'])
self.transformed_features[filename][sentId][
'secloc'] = self.SecLocations.index(
self.features[filename][sentId]['secloc'])
self.transformed_features[filename][sentId][
'Headlines'] = self.Headlines.index(
self.features[filename][sentId]['Headlines'])
self.transformed_features[filename][sentId][
'history'] = self.Tags.index(
self.features[filename][sentId]['history'])
self.transformed_features[filename][sentId][
'tense'] = self.Tenses.index(
self.features[filename][sentId]['tense'])
self.transformed_features[filename][sentId][
'voice'] = self.Voices.index(
self.features[filename][sentId]['voice'])
self.transformed_features[filename][sentId][
'modal'] = self.Modals.index(
self.features[filename][sentId]['modal'])
def getFeatures(self, filenames):
X = []
y = []
for filename in filenames:
for sentId in self.transformed_features[filename].keys():
X.append(self.transformed_features[filename][sentId].values())
y.append(self.transformed_features[filename][sentId]['val'])
X = np.asarray(X)
y = np.asarray(y)
return X, y
def getSummary(self, filename):
summary = []
for sentId in self.transformed_features[filename].keys():
feature = self.transformed_features[filename][sentId].values()
y = self.nb.predict([feature])
if y in [1, 2, 4, 6]:
summary.append(self.features[filename][sentId]['data'])
if y in [0, 1, 5]:
if random.uniform(0, 1) > 0.96:
summary.append(self.features[filename][sentId]['data'])
return "\n".join(summary)
def train(self):
if not self.isSummary:
print "Train dataset: ", len(self.train_papers)
self.reloadDis()
y_pred = self.nb.fit(self.train_X, self.train_y).predict(self.train_X)
if not self.isSummary:
print "Mislabelled sentences: " + str(
(self.train_y != y_pred).sum()) + " out of " + str(
self.train_X.shape[0])
print "Train Accuracy: " + str(
self.accuracy(
(self.train_y != y_pred).sum(), self.train_X.shape[0]))
def test(self, generate_histogram=False):
print "Test dataset length: ", len(self.test_papers)
y_pred = self.nb.predict(self.test_X)
if generate_histogram:
plt.hist(y_pred, density=True)
plt.savefig('histogram.png')
print "Mislabelled sentences: " + str(
(self.test_y != y_pred).sum()) + " out of " + str(
self.test_X.shape[0])
print "Test Accuracy: " + str(
self.accuracy((self.test_y != y_pred).sum(), self.test_X.shape[0]))
# return self.getConfusionMatrix(self.test_y, y_pred)
def accuracy(self, misclassifications, samples):
return (1 - (misclassifications / (samples * 1.0))) * 100.0
def plotConfusionMatrix(self,
cm,
classes,
normalize=True,
title='Confusion matrix',
cmap=plt.cm.Blues):
"""
This function prints and plots the confusion matrix.
Normalization can be applied by setting `normalize=True`.
"""
if normalize:
cm = cm.astype('float') / cm.sum(axis=1)[:, np.newaxis]
print("Normalized confusion matrix")
else:
print('Confusion matrix, without normalization')
print(cm)
plt.imshow(cm, interpolation='nearest', cmap=cmap)
plt.title(title)
plt.colorbar()
tick_marks = np.arange(len(classes))
plt.xticks(tick_marks, classes, rotation=45)
plt.yticks(tick_marks, classes)
fmt = '.2f' if normalize else 'd'
thresh = cm.max() / 2.
for i, j in itertools.product(range(cm.shape[0]), range(cm.shape[1])):
plt.text(j,
i,
format(cm[i, j], fmt),
horizontalalignment="center",
color="white" if cm[i, j] > thresh else "black")
plt.ylabel('True label')
plt.xlabel('Predicted label')
plt.tight_layout()
plt.savefig('confusion_matrix.png')
def getConfusionMatrix(self, y_true, y_pred):
return confusion_matrix(y_true, y_pred)
import numpy as np
import pandas as pd
from sklearn.model_selection import train_test_split
from sklearn.naive_bayes import GaussianNB
from sklearn.metrics import accuracy_score
import matplotlib.pyplot as plt
import seaborn as sns
df = pd.read_csv('diabetes.csv')
x = df.drop('diabetes' ,axis=1)
y = df['diabetes']
x_train, x_test, y_train, y_test = train_test_split(x,y, test_size=0.25, random_state=42)
model = GaussianNB()
model.fit(x_train, y_train)
y_pred = model.predict(x_test)
y_pred
accuracy = accuracy_score(y_test, y_pred)*100
accuracy
from sklearn.model_selection import train_test_split
x_train, x_test, y_train, y_test = train_test_split(x, y, test_size = 0.25, random_state = 0)
print(x_train)
print(x_test)
print(y_train)
import matplotlib.pyplot as plt
import pandas as pd
dt = pd.read_csv('Data.csv')
print(dt)
X = dt.iloc[:, 1:-1].values
y = dt.iloc[:, -1].values
from sklearn.model_selection import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X,
y,
test_size=0.25,
random_state=0)
from sklearn.preprocessing import StandardScaler
sc = StandardScaler()
X_train = sc.fit_transform(X_train)
X_test = sc.transform(X_test)
from sklearn.naive_bayes import GaussianNB
reg = GaussianNB()
reg.fit(X_train, y_train)
y_pred = reg.predict(X_test)
print(
np.concatenate(
(y_pred.reshape(len(y_pred), 1), y_test.reshape(len(y_test), 1)), 1))
from sklearn.metrics import confusion_matrix, accuracy_score
cm = confusion_matrix(y_test, y_pred)
print(cm)
accuracy_score(y_test, y_pred)
X = pd.get_dummies(train_data[features])
X_test = pd.get_dummies(test_data[features])
from sklearn.ensemble import RandomForestClassifier
from sklearn.naive_bayes import GaussianNB
from sklearn.neural_network import MLPClassifier
from sklearn.neighbors import KNeighborsClassifier
from sklearn.metrics import confusion_matrix
from sklearn.impute import SimpleImputer
my_imputer = SimpleImputer()
X = my_imputer.fit_transform(X)
X_test = my_imputer.fit_transform(X_test)
model1 = GaussianNB()
model1.fit(X, y)
model2 = RandomForestClassifier(max_depth=15,
n_estimators=100,
bootstrap=False,
max_features='sqrt',
min_samples_leaf=4,
min_samples_split=10)
model2.fit(X, y)
model3 = MLPClassifier(solver='lbfgs',
alpha=1e-5,
hidden_layer_sizes=(5, 2),
random_state=1,
max_iter=2000)
model3.fit(X, y)
model4 = KNeighborsClassifier(3)
model4.fit(X, y)
plt.show()
"""
#Split the data
X, x, Y, y = train_test_split(features,
targets,
test_size=0.2,
random_state=10)
#Let us try different algorithms to find the best match
#1. Naive-Bayes
from sklearn.naive_bayes import GaussianNB
from sklearn.metrics import accuracy_score
#Create a GaussianNB object
gnb = GaussianNB()
pred = gnb.fit(X, Y).predict(x)
print("Naive-Bayes accuracy: ", accuracy_score(y, pred, normalize=True))
#2. Linear Support Vector Classifier
from sklearn.svm import LinearSVC
svc_model = LinearSVC(random_state=0)
pred = svc_model.fit(X, Y).predict(x)
print("Linear SVC accuracy: ", accuracy_score(y, pred, normalize=True))
#3. k-Nearest-Neighbours classifier
from sklearn.neighbors import KNeighborsClassifier
neigh = KNeighborsClassifier(n_neighbors=3)
neigh.fit(X, Y)
pred = neigh.predict(x)
print("k-Nearest-Neighbours score: ", accuracy_score(y, pred))
# Read the small handwritten digit dataset
digitsData = pd.read_csv('digits_small.csv')
y_digits = digitsData['0']
X_digits = digitsData.drop('0', axis=1)
# Split the data to train and test dataset with 20%
Xtrain, Xtest, ytrain, ytest = train_test_split(X_digits,
y_digits,
random_state=0,
test_size=0.2)
# Choose Gaussian Naive Bayes model
model = GaussianNB()
# Fit the model with the iris dataset
model.fit(Xtrain, ytrain)
# Evaluate the outcome for Xtest
y_fitted = model.predict(Xtest)
# Print the accuracy. It is 0.825.
print("The accuracy of GaussianNB is %f" % (accuracy_score(ytest, y_fitted)))
confusionMat = confusion_matrix(ytest, y_fitted)
sns.heatmap(confusionMat, cbar=False, square=True, annot=True)
plt.xlabel('predicted digits')
plt.ylabel('true digits')
# Evaluate five-fold cross validation scores
cv_score = cross_val_score(model, X_digits, y_digits, cv=5)
print("Cross Validation Scores:", cv_score)
class Emoji(object):
def __init__(self):
# fit the Naive Bayes
np.random.seed(42)
self.emojis = pd.read_pickle('../database/df_emojis.pkl')
def fit(self):
# ------- this part needs work
try:
self.labeled_tweets = pd.read_pickle('../database/labeled.pkl')
print 'it worked'
except:
from label_tweets import label_tweets
tweets = np.array(list(pickle.load(open('../database/yay_moji.pkl','rb'))))
self.by_emoji,self.labeled_tweets = label_tweets(tweets,self.emojis,top = 50, save = True)
self.y = self.labeled_tweets['emoji'].values
self.X = self.labeled_tweets['tweet'].values
def model(self, max_df_ = .8, min_df_ = .001, ngram = (1,2)):
self.X_train, self.X_test, self.y_train, self.y_test = train_test_split(self.X,self.y)
stopwords = set(list(ENGLISH_STOP_WORDS) + ['rt', 'follow', 'dm', 'https', 'ur', 'll' ,'amp', 'subscribe', 'don', 've', 'retweet', 'im', 'http','lt'])
# fit the tfidf or CountVectorizer
self.tfidf = TfidfVectorizer(max_features=10000, max_df = max_df_, min_df=min_df_, stop_words = stopwords, ngram_range = ngram)
self.tfidf.fit(self.X_train)
self.vector = self.tfidf.transform(self.X_train)
# --> add the emoji name to bag of words for each emoji
self.bag = np.array(self.tfidf.get_feature_names())
self.nb = GaussianNB()
self.nb.fit(self.vector.todense(), self.y_train)
def internal_predict(self, print_side_by_side = True):
test_tfidf = self.tfidf.transform(self.X_test)
predicted = self.nb.predict(test_tfidf.todense())
print 'labeled'
acc = np.mean(self.y_test == predicted)
print 'Test accuracy =',acc
print ''
if print_side_by_side:
for true,predict in zip(self.y_test,predicted):
print '-->',true,predict
def predict(self,text):
top_n = 3
test_tfidf = self.tfidf.transform([text])
probs = self.nb.predict_proba(test_tfidf.todense())
probs = probs.flatten()
above_0 = np.argwhere(probs>0).flatten()
above_0 = np.sort(above_0)[::-1]
print '-->',text,'=',
for i in above_0[:5]:
print self.nb.classes_[i],' ',#probs.flatten()[i],' ',
print ''
return probs
def print_top_words(self,top_n_words=5):
# printing top words for each emoji
print ''
print '----- Top {} words for each Emoji in Train set'.format(top_n_words)
print '-'*60
for i in range(len(self.nb.classes_)):
top = self.bag[self.nb.theta_[i].argsort()[::-1]][:top_n_words]
print self.nb.classes_[i],' -->',top
print ''
def naive_bayes(training_file, test_file):
start = time.time()
#-----------------------------------DATA PREPARATION-----------------------------------
training_set = pd.read_csv(training_file, header=None)
test_set = pd.read_csv(test_file, header=None)
#encoding the training set
categorical_feature_mask = training_set.dtypes == object
categorical_cols = training_set.columns[categorical_feature_mask].tolist()
le = LabelEncoder()
training_set[categorical_cols] = training_set[categorical_cols].apply(
lambda col: le.fit_transform(col))
#encoding the test set
categorical_feature_mask = test_set.dtypes == object
categorical_cols = test_set.columns[categorical_feature_mask].tolist()
le = LabelEncoder()
test_set[categorical_cols] = test_set[categorical_cols].apply(
lambda col: le.fit_transform(col))
l = (len(training_set.columns) - 1)
x = training_set.drop([l], axis=1)
y = training_set[l]
l = (len(training_set.columns) - 1)
x_test = test_set.drop([l], axis=1)
y_test = test_set[l]
#-----------------------------------MODEL GENERATION AND PREDICTION-----------------------------------
# Decision tree
gb = GaussianNB()
# Performing training
gb.fit(x, y)
#prediciton of test set class attribute
pred = gb.predict(x_test)
#-----------------------------------COMPARISON AND OUTPUT-----------------------------------
#ytestar = y_test.to_numpy()
true_values = []
y_test_rows = y_test.shape[0]
for i in range(0, (y_test_rows)):
if np.array_equal(y_test[i], pred[i]):
true_values.append(1)
else:
true_values.append(0)
for i in range(0, y_test_rows):
print("ID = " + str(i) + " predicted = " + str(pred[i]) + " true = " +
str(y_test[i]) + " accuracy = " + str(true_values[i]))
print("\nClassification report:\n" + classification_report(y_test, pred))
print("Runtime: ")
print(time.time() - start)
train_y = np.mat(df_train.iloc[select_idx]['label'].tolist()).reshape((-1, 1))
##构建测试集矩阵
test_x = makeDataMat(df_train.iloc[test_select_idx], vocabList)
test_y = np.mat(df_train.iloc[test_select_idx]['label'].tolist()).reshape(
(-1, 1))
# In[12]:
train_x.shape, train_y.shape
# In[13]:
#模型训练
model = GaussianNB()
model.fit(train_x, train_y)
# In[14]:
#二分类参数
model.class_prior_
# In[15]:
sum(train_y)
# In[16]:
model.predict(
np.array(word2Vect('这个真的好可爱啊！我超喜欢这里的', vocabList)).reshape(1, -1))