def drawDecisionTree(data, name):
data['change next day class'] = data['change next day'].apply(classify)
X_train, X_test, y_train, y_test = train_test_split(
data[[
'rate of increase', 'increase length', 'rate of decrease',
'decrease length'
]],
data['change next day class'],
test_size=0.2,
random_state=42)
tree = DecisionTreeClassifier(max_depth=6, random_state=0)
tree.fit(X_train, y_train)
print('Train score:{:.3f}'.format(tree.score(X_train, y_train)))
print('Test score:{:.3f}'.format(tree.score(X_test, y_test)))
#生成可视化图
export_graphviz(tree,
out_file="tree.dot",
feature_names=[
'rate of increase', 'increase length',
'rate of decrease', 'decrease length'
],
impurity=False,
filled=True)
#展示可视化图
graph = pydotplus.graph_from_dot_file('tree.dot')
graph.write_pdf(name + '.pdf')
def get_best_tree(model, X, keep_scores=False):
"""
Given a model of ensembled trees with an `estimators_` attribute,
finds the tree that most closely resembles
Parameters
----------
model
X
Returns
-------
"""
overall_prediction = model.predict(X)
predictions = dict()
scores = dict()
best_score, best_tree_number = -999, -999
for tree_num, tree in enumerate(model.estimators_):
predictions[tree_num] = tree.predict(X)
new_score = tree.score(X, overall_prediction)
scores[tree_num] = new_score
if new_score > best_score:
best_score = new_score
best_tree_number = tree_num
nearest_tree = model.estimators_[best_tree_number]
if keep_scores:
return best_tree_number, nearest_tree, scores
return best_tree_number, nearest_tree
def evaluate_regressor(tree, X, Y):
"""
Evaluates a tree with the data values passed, returning the R2 and MSE
"""
r2 = tree.score(X, Y)
e = tree.predict(X)
mse = np.average(np.power((e - Y.values), 2))
return r2, mse
def process_chunk(self, chunk):
def update_min_max_count_dict(key, dict1, dict2):
return {
'max': max(dict1[key]['max'], dict2[key]['max']),
'min': max(dict1[key]['min'], dict2[key]['min']),
'count': dict1[key]['count'] + dict2[key]['count'],
}
new_min_max_count = get_feature_min_max_count(chunk,
self.feature_names)
if self.feature_min_max_count is None:
self.feature_min_max_count = new_min_max_count
else:
self.feature_min_max_count = {
key: update_min_max_count_dict(key, self.feature_min_max_count,
new_min_max_count)
for key in self.feature_names
}
chunk = self.__preprocess_data(chunk, self.feature_names)
tree = sklearn.tree.DecisionTreeRegressor(criterion='mse',
random_state=42,
**self.model_params)
train, test = sklearn.model_selection.train_test_split(chunk,
random_state=42)
plot, _ = sklearn.model_selection.train_test_split(chunk,
random_state=42,
train_size=min(
100,
len(chunk) - 1),
test_size=0)
self.plot_data_frames.append(plot)
tree.fit(train[self.model_feature_names], train[self.output_name])
self.test_scores.append(
tree.score(test[self.model_feature_names], test[self.output_name]))
self.train_scores.append(
tree.score(train[self.model_feature_names],
train[self.output_name]))
self.trees.append(tree)
def cluster_then_forest(xs, ys, in_sample_size):
isi, in_sample, osi, out_sample = create_in_out_samples(xs, in_sample_size)
clf = cluster.KMeans(n_clusters=4)
clf.fit(in_sample)
oos_clusterid = clf.predict(out_sample)
ins_clusterid = clf.predict(in_sample)
for id in numpy.unique(oos_clusterid):
print "Now working on Cluster " + str(id)
oos_ind = oos_clusterid == id
ins_ind = ins_clusterid == id
tree = ensemble.RandomForestRegressor(50)
tree.fit(in_sample[ins_ind], ys[isi][ins_ind])
print "Score for in-sample"
print str(tree.score(in_sample[ins_ind], ys[isi][ins_ind]))
print "Score for out-of sample"
tree.predict(out_sample[oos_ind])
print str(tree.score(out_sample[oos_ind], ys[osi][oos_ind]))
return None
def cluster_then_forest(xs, ys, in_sample_size):
isi, in_sample, osi, out_sample = create_in_out_samples(xs, in_sample_size)
clf = cluster.KMeans(n_clusters = 4)
clf.fit(in_sample)
oos_clusterid = clf.predict(out_sample)
ins_clusterid = clf.predict(in_sample)
for id in numpy.unique(oos_clusterid):
print "Now working on Cluster " + str(id)
oos_ind = oos_clusterid == id
ins_ind = ins_clusterid == id
tree = ensemble.RandomForestRegressor(50)
tree.fit(in_sample[ins_ind], ys[isi][ins_ind])
print "Score for in-sample"
print str(tree.score(in_sample[ins_ind], ys[isi][ins_ind]))
print "Score for out-of sample"
tree.predict(out_sample[oos_ind])
print str(tree.score(out_sample[oos_ind], ys[osi][oos_ind]))
return None
def cross_val(data, classifiers):
averages = []
for i in range(5):
bayes_estimates = []
tree_estimates =[]
data = np.array(data)
classifiers = np.array(classifiers)
folds = cross_validation.KFold(len(classifiers), n_folds=10, shuffle=True)
for train, test in folds:
bayes = naive_bayes(data[train], classifiers[train])
bayes_estimates.append(bayes.score(data[test], classifiers[test]))
tree = decision_tree(data[train], classifiers[train])
tree_estimates.append(tree.score(data[test], classifiers[test]))
temp = []
temp.append(np.mean(bayes_estimates))
temp.append(np.mean(tree_estimates))
averages.append(temp)
visualize(averages)
def classify(keyword2int):
import numpy as np
import matplotlib.pyplot as plt
import scipy.misc
from PIL import Image
import pprint
pp = pprint.PrettyPrinter(indent=4)
# In[18]:
import sklearn
from sklearn import datasets
import skimage.io
# ## Datasets preparation
# In[19]:
def png2vec(filename):
img = Image.open(filename).convert('L')
arr = np.array(img)
return arr
# In[20]:
filesetNames = ["%01d" % x for x in range(0, 2)]
# In[21]:
import os
images = []
tgt = []
count = 0
img_test = Image.open("./img/0/1.jpg")
for curFileset in filesetNames:
curPath = "./img/" + curFileset + "/"
for file in os.listdir(curPath):
curImageVector = png2vec(curPath + file)
images.append(curImageVector)
tgt.append(curFileset)
count += 1
#end
print(len(images))
# In[22]:
# In[24]:
from sklearn.model_selection import train_test_split
from sklearn import model_selection, metrics
images_np = np.array(images)
img = images_np.reshape(images_np.shape[0], -1)
xM, xT, yM, yT = train_test_split(img, tgt, test_size=0.01)
print(yT)
xT = list(xT)
#map(list,xT)
xT.extend(xM[0:20])
yT.extend(yM[0:20])
print(yT)
xT = np.array(xT)
print(yT)
# # Naive Bayes
# In[25]:
# 要传参！！！ from search keyword2int
# 要传参！！！ from search keyword2int
#keyword2int = {'dog':0,'cat':1}
from sklearn import metrics
from sklearn import naive_bayes
cls = naive_bayes.GaussianNB()
cls.fit(xM, yM)
res = cls.predict(xT)
print(type(xT[0:1]))
print(len(xT), len(xT[0]), 'result', type(xT))
print(res)
print(metrics.confusion_matrix(yT, res), metrics.accuracy_score(yT, res),
"GaussianNB")
#plt.title('这个图片是'+str(list(keyword2int.keys())[0])+'预测结果是'+ str(list(keyword2int.keys())[int(res_test[0])]))
#plt.imshow(img_test)
#plt.show()
# In[26]:
cls = naive_bayes.BernoulliNB(binarize=0.9)
cls.fit(xM, yM)
res = cls.predict(xT)
print(metrics.confusion_matrix(yT, res), metrics.accuracy_score(yT, res),
"BernoulliNB")
# In[27]:
cls = naive_bayes.MultinomialNB(alpha=0.1,
fit_prior=True,
class_prior=None)
cls.fit(xM, yM)
res = cls.predict(xT)
print(metrics.confusion_matrix(yT, res), metrics.accuracy_score(yT, res),
"naive_bayes.MultinomialNB")
# # KNN
# In[28]:
from sklearn.neighbors import KNeighborsClassifier
cls = KNeighborsClassifier(n_neighbors=1)
cls.fit(xM, yM)
res = cls.predict(xT)
print(metrics.confusion_matrix(yT, res), metrics.accuracy_score(yT, res),
' knn')
# # Decision Tree
# In[33]:
from sklearn import tree
cls = tree.DecisionTreeClassifier()
cls = cls.fit(xM, yM)
res = cls.predict(xT)
print(metrics.confusion_matrix(yT, res), metrics.accuracy_score(yT, res),
"Decision Tree")
import random
index = random.randint(0, 10)
x_test = xT[index]
y_tag = yT[index]
DT_res = cls.predict([x_test])
x_test_image_list = list(x_test)
x_temp = []
x_image = []
for j in range(100):
for i in range(100):
x_temp.append(x_test[i + j * 100])
x_image.append(x_temp)
x_temp = []
np.array(x_image)
plt.title('the image is ' + str(list(keyword2int.keys())[int(y_tag)]) +
' result is ' + str(list(keyword2int.keys())[int(DT_res[0])]))
print(DT_res)
print(
list(keyword2int.keys())[int(y_tag)],
list(keyword2int.keys())[int(DT_res[0])])
plt.imshow(x_image)
plt.show()
import sys
sys.exit()
# In[40]:
from sklearn.tree import DecisionTreeClassifier
tree = DecisionTreeClassifier(random_state=0, min_samples_split=2)
tree.fit(xT, yT)
print(tree.score(xT, yT), tree.score(xM, yM), "DecisionTreeClassifier")
# In[37]:
DecisionTreeClassifier()
# # random forest
# In[56]:
from sklearn.ensemble import RandomForestClassifier
forest = RandomForestClassifier(n_estimators=150, random_state=0)
forest.fit(xT, yT)
forest.score(xT, yT), forest.score(xM, yM)
# In[44]:
forest
# In[74]:
scoreListUniform = []
nListUniform = []
stepCount = 10
stepDist = 200
start = 200
end = 2001
for curCount in range(start, end, stepDist):
forest = RandomForestClassifier(n_estimators=curCount, random_state=0)
forest.fit(xT, yT)
nListUniform.append(curCount)
scoreListUniform.append(forest.score(xM, yM))
scoreListUniform
# ## SVM
# In[76]:
from sklearn import svm
cls = svm.SVC()
cls = cls.fit(xM, yM)
res = cls.predict(xT)
print(metrics.confusion_matrix(yT, res), metrics.accuracy_score(yT, res),
" svm")
from sklearn import svm
import matplotlib.pyplot as plt
import numpy
n_trials = 3
train_percentages = range(5, 95, 5)
test_accuracies = numpy.zeros(len(train_percentages))
for (i, tp) in enumerate(train_percentages):
test_accuracy = numpy.zeros(n_trials)
for n in range(n_trials):
xM, xT, yM, yT = train_test_split(digits.data,
digits.target,
train_size=tp / 100.0)
cls = svm.LinearSVC().fit(xM, yM)
res = cls.predict(xT)
test_accuracy[n] = metrics.accuracy_score(yT, res)
test_accuracies[i] = test_accuracy.mean()
print(i, tp, test_accuracies[i])
print(train_percentages)
fig = plt.figure()
plt.plot(train_percentages, test_accuracies)
plt.xlabel('Percentage of Data Used for Training')
plt.ylabel('Accuracy on Test Set')
plt.show()
#tratando valores nulos encontrados pela média
new_data_train['Age'].fillna(new_data_train['Age'].mean(), inplace=True)
new_data_test['Age'].fillna(new_data_test['Age'].mean(), inplace=True)
#Verificação de valores nulos, de ordem descrescente com os 10 primeiros
new_data_test.isnull().sum().sort_values(ascending=False).head(10)
#tratamento do valor nulo coluna fare pela média
new_data_test['Fare'].fillna(new_data_test['Fare'].mean(), inplace=True)
#separado as features para a criação do modelo
X = new_data_train.drop("Survived", axis=1) #tirando apenas a coluna target
y = new_data_train["Survived"] # colocando somente a coluna target
from sklearn import tree
from sklearn.tree import DecisionTreeClassifier
#parametrizando o tamanho a arvore de decisao
tree = DecisionTreeClassifier(max_depth=3, random_state=0)
tree.fit(X, y)
#avaliando o modelo
tree.score(X, y)
#Enviando a previsão para o Kaggle
previsao = pd.DataFrame()
previsao["PassengerId"] = new_data_test["PassengerId"]
previsao["Survived"] = tree.predict(new_data_test)
#importando para CSV
previsao.to_csv('previsao.csv', index=False)
regiao = 'Grande Florianópolis'
localizacao = 'URBANA'
serie = '8º ano'
regiao_enc = encoders['regiao'].transform([regiao])[0]
localizacao_enc = encoders['localizacao'].transform([localizacao])[0]
serie_enc = encoders['serie'].transform([serie])[0]
prediction_enc = tree.predict([[regiao_enc, localizacao_enc, serie_enc]])
prediction = encoders['status'].inverse_transform(int(prediction_enc[0]))
proba = tree.predict_proba([[regiao_enc, localizacao_enc, serie_enc]])[0]
# Output
print('\nAcurácia do classificador: ' + str(tree.score(data, target)))
print('\nA predição retornou: ' + prediction)
if prediction == 'Suficiente':
print('O aluno atende aos pré requisitos do Bolsa Família.')
else:
print(
'O aluno não atende aos pré requisitos do Bolsa Família e deve ser desligado do programa.'
)
print('\nPeso de cada variável:')
for i in range(len(default_csv[0]) - 1):
print('\t' + default_csv[0][i] + ': ' +
str(tree.feature_importances_[i]))
print('\nGrau de certeza de cada possível resposta:')
X = data.values[:, :-1]
y = data.values[:, -1]
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.5)
svm = svm.SVC(probability=True)
logreg = LogisticRegression()
tree = tree.DecisionTreeClassifier()
svm.fit(X_train, y_train)
logreg.fit(X_train, y_train)
tree.fit(X_train, y_train)
print("SVM Accuracy: %.2f%s" %
(svm.score(X_test, y_test) * 100, '%'))
print("LogReg Accuracy: %.2f%s" %
(logreg.score(X_test, y_test) * 100, '%'))
print("Tree Accuracy: %.2f%s" %
(tree.score(X_test, y_test) * 100, '%'))
w = [1, 1, 1]
ensemble = VotingClassifier(
estimators=[('svm', svm),
('logreg', logreg),
('tree', tree)],
voting='hard', weights=w)
ensemble.fit(X_train, y_train)
print("Ensemble Accuracy: %.2f%s" %
(ensemble.score(X_test, y_test) * 100, '%'))
plt.scatter(x_data[:, 0], x_data[:, 1], c=y_data) plt.show() # 准确率 print(kNN.score(x_test, y_test)) '''建决策树模型''' tree = tree.DecisionTreeClassifier() tree.fit(x_train, y_train) # 画图 draw(tree) plt.scatter(x_data[:, 0], x_data[:, 1], c=y_data) plt.show() # 准确率 print(tree.score(x_test, y_test)) '''接下来使用bagging集成学习，加入kNN''' # 100个不放回的抽样，也就是训练100个kNN分类器 bagging_kNN = BaggingClassifier(kNN, n_estimators=100) bagging_kNN.fit(x_train, y_train) # 画图 draw(bagging_kNN) plt.scatter(x_data[:, 0], x_data[:, 1], c=y_data) plt.show() # 准确率 print(bagging_kNN.score(x_test, y_test)) '''加入决策树的集成学习''' bagging_tree = BaggingClassifier(tree, n_estimators=100) bagging_tree.fit(x_train, y_train)
targets_test = test.loc[:, 'over_50k']
#the decision tree tends to overfit the training data at the expense of lower accuracy in testing
#this can be mitigated by specifying a maximum tree depth
#using the validation data to pick a tree depth
validation_accs = [] #list of all validation accuracies
for i in range(1, 24):
#decision tree model
tree = DecisionTreeClassifier(max_depth=i,
random_state=0) #specify model type
tree.fit(data_train, targets_train) #fit the model
#add accuracy for this test to testing_accs
validation_accs.append(100 *
tree.score(data_validation, targets_validation))
depth = validation_accs.index(
max(validation_accs)
) + 1 #the tree depth that produced the greatest test accuracy - in general this tends to be 7 or 8
print('\nSelecting a maximum tree depth of ' + str(depth))
#decision tree model
model = DecisionTreeClassifier(max_depth=depth,
random_state=0) #specify model type
model.fit(data_train, targets_train) #fit the model
print('Testing accuracy: ' + str('%.2f' %
(100 * tree.score(data_test, targets_test))) +
'%') #tends to be roughly 82%
print(All_X.shape, train_X.shape, val_X.shape, train_y.shape, val_y.shape,
test_X.shape)
# In[ ]:
#Feature importance
tree = DecisionTreeClassifier(random_state=99)
tree.fit(train_X, train_y)
imp = pd.DataFrame(tree.feature_importances_,
columns=['Importance'],
index=train_X.columns)
imp = imp.sort_values(['Importance'], ascending=True)
imp[:10].plot(kind='barh')
print(tree.score(train_X, train_y))
# In[ ]:
# Modeling
MLA = [
#Ensemble Methods
ensemble.AdaBoostClassifier(),
ensemble.BaggingClassifier(),
ensemble.ExtraTreesClassifier(),
ensemble.GradientBoostingClassifier(),
ensemble.RandomForestClassifier(),
#Gaussian Processes
gaussian_process.GaussianProcessClassifier(),
info = [0.66, 0.8, 0.9, 0.95]
depths = len(info) * [None]
nleaves = len(info) * [None]
accuracies_train = len(info) * [None]
accuracies_test = len(info) * [None]
for index in range(0, len(info)):
elem = info[index]
pca = PCA(elem)
reduced_d2_X_train = pca.fit_transform(d2_X_train)
reduced_d2_X_test = pca.transform(d2_X_test)
tree = DecisionTreeClassifier()
model = tree.fit(reduced_d2_X_train, y_train)
depths[index] = tree.get_depth()
nleaves[index] = tree.get_n_leaves()
accuracies_train[index] = tree.score(reduced_d2_X_train, y_train)
accuracies_test[index] = tree.score(reduced_d2_X_test, y_test)
t = PrettyTable()
t.add_column("% information", info)
t.add_column("Tree depth", depths)
t.add_column("number of leaves", nleaves)
t.add_column("Accuracy on train set", accuracies_train)
t.add_column("Accuracy on test set", accuracies_test)
print(t)
res_model.append("Decision tree")
res_param.append("Unrestricted max depth \n66% of information")
res_train_acc.append(accuracies_train[0])
res_valid_acc.append("-")
res_test_acc.append(accuracies_test[0])
X = data.values[:, :-1]
y = data.values[:, -1]
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.5)
svm = svm.SVC(probability=True)
logreg = LogisticRegression()
tree = tree.DecisionTreeClassifier()
svm.fit(X_train, y_train)
logreg.fit(X_train, y_train)
tree.fit(X_train, y_train)
print("SVM Accuracy: %.2f%s" % (svm.score(X_test, y_test) * 100, '%'))
print("LogReg Accuracy: %.2f%s" % (logreg.score(X_test, y_test) * 100, '%'))
print("Tree Accuracy: %.2f%s" % (tree.score(X_test, y_test) * 100, '%'))
w = [
svm.score(X_test, y_test),
logreg.score(X_test, y_test),
tree.score(X_test, y_test)
]
ensemble = VotingClassifier(estimators=[('svm', svm), ('logreg', logreg),
('tree', tree)],
voting='soft',
weights=w)
ensemble.fit(X_train, y_train)
print("Ensemble Accuracy: %.2f%s" %
(ensemble.score(X_test, y_test) * 100, '%'))
def evaluate_classifier(tree, X, Y):
"""
Evaluates a tree with the data values passed, returning the R2 and MSE
"""
miss_rate = tree.score(X, Y)
return miss_rate
def decision_tree():
# Decision Tree
tree = tree.DecisionTreeClassifier()
tree.fit(X_train, y_train)
tree_pred = tree.predict(X_test)
print("Tree test set score: {:.5f}".format(tree.score(X_test, y_test)))
from scipy import misc
# from sklearn.metrics import accuracy_score
def show_tree(tree, features, path):
f = io.StringIO()
export_graphviz(tree,
out_file=f,
class_names=['malignant', 'benign'],
feature_names=features,
impurity=False)
pydotplus.graph_from_dot_data(f.getvalue()).write_png(path)
img = misc.imread(path)
plt.rcParams['figure.figsize'] = (20, 20)
plt.imshow(img)
cancer = load_breast_cancer()
X_train, X_test, y_train, y_test = train_test_split(cancer.data,
cancer.target,
stratify=cancer.target,
random_state=42)
tree = DecisionTreeClassifier(max_depth=6,
min_samples_split=10,
random_state=0)
tree.fit(X_train, y_train)
show_tree(tree, cancer.feature_names, "BreastCancer.png")
accuracy = tree.score(X_test, y_test)
print('Accuracy :', accuracy)
edges[edge.get_source()].append(int(edge.get_destination()))
for edge in edges:
edges[edge].sort()
for i in range(2):
dest = graph.get_node(str(edges[edge][i]))[0]
dest.set_fillcolor(colors[i])
graph.write_png('tree.png')
"""
#########################################################################
prediction = tree.predict(test_features)
print("The prediction accuracy is: ",
tree.score(test_features, test_targets) * 100, "%")
# x axis values
x = ['sun', 'mon', 'fri', 'sat', 'tue', 'wed', 'thu']
# y axis values
y = [5, 6.7, 4, 6, 2, 4.9, 1.8]
# plotting strip plot with seaborn
ax = sns.stripplot(x, y)
# giving labels to x-axis and y-axis
ax.set(xlabel='x', ylabel='y')
# giving title to the plot
plt.title('My first graph')
4, # número de épocas, sem redução na função de perda, que o monitor espera para agir.
verbose=1,
)
#fazendo uso dos monitores criados
history = model.fit(X_train,
y_train_cat,
batch_size=batch_size,
epochs=epochs,
callbacks=[reduce_lr, early_stopping],
verbose=1,
validation_data=(X_valid, y_valid_cat))
print("1-NN: ", 1 - neigh.score(X_valid, y_valid))
print("SVM: ", 1 - svm.score(X_valid, y_valid))
print('Tree: ', 1 - tree.score(X_valid, y_valid))
print("MLP:", 1 - model.evaluate(X_valid, y_valid_cat, verbose=0)[1])
plt.plot(history.history['acc'])
plt.plot(history.history['val_acc'])
plt.title('model accuracy')
plt.ylabel('accuracy')
plt.xlabel('epoch')
plt.legend(['train', 'val'], loc='upper left')
plt.show()
# summarize history for loss
plt.plot(history.history['loss'])
plt.plot(history.history['val_loss'])
plt.title('model loss')
plt.ylabel('loss')
plt.xlabel('epoch')
print("Acuracia de teste NAIVE BAYES: %0.3f" % te1)
#precision NAIVE BAYES
y_pred1 = gnb.predict(X_test)
micro_precision1 = precision_score(Y_test, y_pred1, average='macro')
print("Precision NAIVE BAYES: %0.3f" % micro_precision1)
#recall NAIVE BAYES
recall1 = recall_score(Y_test, y_pred1, average='macro')
print("Recall NAIVE BAYES: %0.3f" % recall1)
#criando e treinando arvore de decisao
tree = tree.DecisionTreeClassifier(criterion='entropy', random_state=1)
t_tree = time()
tree = tree.fit(X_train, Y_train)
tf_tree = round(time() - t_tree, 3)
print("Training time Arvore de Decisao:", tf_tree, "s")
t2 = round(tree.score(X_train, Y_train), 3)
te2 = round(tree.score(X_test, Y_test), 3)
#acuracia treino e test
print("Acuracia de treinamento ARVORE DE DECISAO: %0.3f" % t2)
print("Acuracia de teste ARVORE DE DECISAO: %0.3f" % te2)
#precision arvore de decisao
y_pred2 = tree.predict(X_test)
micro_precision2 = precision_score(Y_test, y_pred2, average='macro')
print("Precision ARVORE DE DECISAO: %0.3f" % micro_precision2)
#recall ARVORE DE DECISAO
recall2 = recall_score(Y_test, y_pred2, average='macro')
print("Recall ARVORE DE DECISAO: %0.3f" % recall2)
#criando e treinando logistic regression
lr = LogisticRegression(random_state=1)
t_lr = time()
# max_depth = 3
list_min_leaves = [i for i in range(1, 10)]
for criterion in insert_criterion:
for depth in range(2, 7):
for min_leaf in list_min_leaves:
# tree = DecisionTreeClassifier(criterion=criterion, max_depth=max_depth,
# min_samples_leaf=min_leaf, random_state=42)
tree = DecisionTreeClassifier(criterion=criterion,
max_depth=depth,
min_samples_leaf=min_leaf,
random_state=42)
tree.fit(x_train, y_train)
train_result.append(tree.score(x_train, y_train))
test_result.append(tree.score(x_test, y_test))
criterions.append(criterion)
# max_depths.append(max_depth)
max_depths.append(depth)
min_leaves.append(min_leaf)
result = pd.DataFrame()
result["Criterion"] = criterions
result["Depth"] = max_depths
result["MinLeafSize"] = min_leaves
result["Train_Acc"] = train_result
result["Test_Acc"] = test_result
forest = sklearn.ensemble.RandomForestRegressor(n_estimators=100,
max_depth=10,
random_state=4324)
# forest_pipe = sklearn.pipeline.Pipeline([("Scale", scaler), ("Model", forest)])
forest.fit(X_train, y_train)
tree = sklearn.tree.DecisionTreeRegressor(max_depth=3, random_state=575767)
tree.fit(X_train, y_train)
print("Linear Regression & {:.3f} & {:.3f} \\\\".format(
lm.score(X_train, y_train), lm.score(X_test, y_test)))
print("Random Forest & {:.3f} & {:.3f} \\\\".format(
forest.score(X_train, y_train), forest.score(X_test, y_test)))
print("Decision Tree & {:.3f} & {:.3f} \\\\".format(
tree.score(X_train, y_train), tree.score(X_test, y_test)))
# fig, ax = plt.subplots(figsize=(15, 5))
# sklearn.tree.plot_tree(tree, filled=True, impurity=False, fontsize=10, ax=ax)
# plt.show()
vaasa_iter = [
get_data_week_and_two_previous(col, "Vaasa", algae) +
get_data_week_and_two_previous(col, "Vaasa", temps) +
get_data_week_and_two_previous(col, "Vaasa", rains) +
get_data_week_and_two_previous(col, "Vaasa", aqs)
# + [population.loc["Vaasa"][str(col[0])]]
+ [visits.loc["Vaasa"][col] / population.loc["Vaasa"][str(col[0])]]
for col in visits.columns
]
vaasa_data = np.stack(vaasa_iter)
def classify(keyword2int):
import numpy as np
import matplotlib.pyplot as plt
import scipy.misc
from PIL import Image
import pprint
pp = pprint.PrettyPrinter(indent = 4)
# In[18]:
import sklearn
from sklearn import datasets
import skimage.io
# ## Datasets preparation
# In[19]:
def png2vec(filename):
img = Image.open(filename).convert('L')
arr = np.array(img)
return arr
# In[20]:
filesetNames = ["%01d" %x for x in range(0,2)]
# In[21]:
import os
images = []
tgt = []
count = 0
img_test = Image.open("./img/0/1.jpg")
for curFileset in filesetNames:
curPath = "./img/"+ curFileset + "/"
for file in os.listdir(curPath):
curImageVector = png2vec(curPath + file)
images.append(curImageVector)
tgt.append(curFileset)
count += 1
#end
print (len(images))
# In[22]:
'''
import random
index = random.randint(0,count - 1)
random_raw_image = images[index]
random_im = Image.fromarray(random_raw_image)
title = "No."+ "%04d"%index + " Tag:" + tgt[index]
plt.title(title)
plt.imshow(random_im)
# In[23]:
random_raw_image.flatten()
'''
# In[24]:
from sklearn.model_selection import train_test_split
from sklearn import model_selection, metrics
images_np = np.array(images)
img = images_np.reshape(images_np.shape[0],-1)
xM, xT, yM, yT = train_test_split(img, tgt, test_size = 0.01)
print(yT)
xT = list(xT)
#map(list,xT)
xT.extend(xM[0:20])
yT.extend(yM[0:20])
print(yT)
xT = np.array(xT)
print(yT)
# # Naive Bayes
# In[25]:
# 要传参！！！ from search keyword2int
# 要传参！！！ from search keyword2int
#keyword2int = {'dog':0,'cat':1}
from sklearn import metrics
from sklearn import naive_bayes
cls = naive_bayes.GaussianNB()
cls.fit(xM, yM)
res = cls.predict(xT)
print(type(xT[0:1]))
print(len(xT),len(xT[0]),'result',type(xT))
print(res)
print(metrics.confusion_matrix(yT, res),metrics.accuracy_score(yT, res),"GaussianNB")
#plt.title('这个图片是'+str(list(keyword2int.keys())[0])+'预测结果是'+ str(list(keyword2int.keys())[int(res_test[0])]))
#plt.imshow(img_test)
#plt.show()
# In[26]:
cls = naive_bayes.BernoulliNB(binarize = 0.9)
cls.fit(xM, yM)
res = cls.predict(xT)
print(metrics.confusion_matrix(yT, res),metrics.accuracy_score(yT, res),"BernoulliNB")
# In[27]:
cls = naive_bayes.MultinomialNB(alpha=0.1, fit_prior=True, class_prior=None)
cls.fit(xM, yM)
res = cls.predict(xT)
print(metrics.confusion_matrix(yT, res),metrics.accuracy_score(yT, res),"naive_bayes.MultinomialNB")
# # KNN
# In[28]:
from sklearn.neighbors import KNeighborsClassifier
cls = KNeighborsClassifier(n_neighbors=7)
cls.fit(xM, yM)
res = cls.predict(xT)
print(metrics.confusion_matrix(yT, res),metrics.accuracy_score(yT, res),' knn')
'''
# ## KNN Parameters
# In[30]:
scoreListUniform = []
nListUniform = []
stepCount = 10
start = 1
end = 10
for curN in range(start,end):
cls = KNeighborsClassifier(n_neighbors=curN,weights = 'uniform')
cls.fit(xM, yM)
res = cls.predict(xT)
curScore = metrics.accuracy_score(yT, res)
nListUniform.append(curN)
scoreListUniform.append(curScore)
scoreListUniform
# In[75]:
scoreListDistance = []
nListDistance = []
for curN in range(start,end):
cls = KNeighborsClassifier(n_neighbors = curN,weights = 'distance')
cls.fit(xM, yM)
res = cls.predict(xT)
curScore = metrics.accuracy_score(yT, res)
nListDistance.append(curN)
scoreListDistance.append(curScore)
scoreListDistance
# ## Plot
# In[ ]:
x = range(start,end)
plt.figure(figsize = (8,4))
plt.plot(x,scoreListUniform,"r-",label = "Uniform Weights",linewidth = 1)
plt.plot(x,scoreListDistance,"b-",label = "Weights by Distance",linewidth = 1)
plt.xlabel("Neighbours")
plt.ylabel("Score")
plt.title("KNN Parameters Scores")
plt.legend()
plt.savefig("KnnParameters.png")
plt.show()
# ## KNN Parameters: weights
# In[ ]:
scoreList = []
nList = []
stepCount = 10
start = 1
end = 10
cls = KNeighborsClassifier(weights = 'uniform')
cls.fit(xM, yM)
res = cls.predict(xT)
curScore = metrics.accuracy_score(yT, res)
nList.append('uniform')
scoreList.append(curScore)
cls = KNeighborsClassifier(weights = 'distance')
cls.fit(xM, yM)
res = cls.predict(xT)
curScore = metrics.accuracy_score(yT, res)
nList.append('distance')
scoreList.append(curScore)
'''
# # Decision Tree
# In[33]:
from sklearn import tree
cls = tree.DecisionTreeClassifier()
cls = cls.fit(xM,yM)
res = cls.predict(xT)
print(metrics.confusion_matrix(yT,res), metrics.accuracy_score(yT,res),"Decision Tree")
import random
index = random.randint(0, 10)
x_test = xT[index]
y_tag = yT[index]
DT_res = cls.predict([x_test])
x_test_image_list = list(x_test)
x_temp = []
x_image = []
for j in range(100):
for i in range(100):
x_temp.append(x_test[i+j*100])
x_image.append(x_temp)
x_temp = []
np.array(x_image)
plt.title('the image is '+str(list(keyword2int.keys())[int(y_tag)])+' res is '+ str(list(keyword2int.keys())[int(DT_res[0])]))
print(DT_res)
print(list(keyword2int.keys())[int(y_tag)],list(keyword2int.keys())[int(DT_res[0])])
plt.imshow(x_image)
plt.show()
import sys
sys.exit()
# In[40]:
from sklearn.tree import DecisionTreeClassifier
tree = DecisionTreeClassifier(random_state=0, min_samples_split=2)
tree.fit(xT,yT)
print(tree.score(xT, yT),tree.score(xM, yM),"DecisionTreeClassifier")
# In[37]:
DecisionTreeClassifier()
# # random forest
# In[56]:
from sklearn.ensemble import RandomForestClassifier
forest = RandomForestClassifier(n_estimators=150, random_state=0)
forest.fit(xT, yT)
forest.score(xT, yT),forest.score(xM, yM)
# In[44]:
forest
# In[74]:
scoreListUniform = []
nListUniform = []
stepCount = 10
stepDist = 200
start = 200
end = 2001
for curCount in range(start,end,stepDist):
forest = RandomForestClassifier(n_estimators = curCount, random_state=0)
forest.fit(xT, yT)
nListUniform.append(curCount)
scoreListUniform.append(forest.score(xM, yM))
scoreListUniform
# In[94]:
# ### Gini Random
# ### Entropy Best
# ### Entropy Random
# ## SVM
# In[76]:
'''
'''
from sklearn import svm
cls = svm.SVC()
cls = cls.fit(xM,yM)
res = cls.predict(xT)
print(metrics.confusion_matrix(yT,res), metrics.accuracy_score(yT,res), " svm")
# In[77]:
'''
max_iter=500,
random_state=17,
n_jobs=4,
multi_class='multinomial')
logit_pipe = Pipeline([('scaler', StandardScaler()), ('logit', logit)])
logit_pipe.fit(X_train, y_train)
y_pred_lf = logit_pipe.predict(X_test)
score_lf = accuracy_score(y_test, y_pred_lf)
##### 0.41
##### Decision Tree
tree = tree.DecisionTreeClassifier()
tree.fit(X_train, y_train)
y_pred_tree = tree.predict(X_test)
score_tree = tree.score(X_test, y_test)
##### 0.38
##### Random Forest
forest = RandomForestClassifier(n_estimators=100, random_state=17, n_jobs=4)
forest.fit(X_train, y_train)
y_pred_forest = forest.predict(X_test)
S = accuracy_score(y_test, y_pred_forest)
##### 0.43
##### SVM
### Linear
from sklearn.svm import SVC
svc = OneVsRestClassifier(SVC()).fit(X_train, y_train)
loans_info['orig_fico'] = loans_orig_info['nb_original_fico']
loans_info['nb_realized_loss'] = np.log(loans_info['nb_realized_loss'])
loans_info['orig_balance'] = np.log(loans_info['orig_balance'])
vals = 0
runs = 100
x1 = 0
x2 = 0
x3 = 0
x4 = 0
for x in range (0,runs):
clf = DecisionTreeClassifier()
data = loans_info.dropna(axis = 0, how = 'any')
X = (data.drop(columns={'nb_loan_number','nb_realized_loss', 'caused_loss','age'}))
X_train, X_test, Y_train, Y_test = train_test_split(X, data['caused_loss'], test_size = .7, train_size = .3)
tree = clf.fit(X_train, Y_train)
vals = vals + (tree.score(X_test, Y_test))
#print(tree.feature_importances_)
x1 += tree.feature_importances_[0]
x2 += tree.feature_importances_[1]
x3 += tree.feature_importances_[2]
x4 += tree.feature_importances_[3]
print(vals/runs)
print('Average Importance of Loan Term, Loam Amount, FICO Score, and Loan to Value Ratio')
print(x1/runs)
print(x2/runs)
print(x3/runs)
x4/runs
def decision_tree_regressor(x_train, y_train, x_test, y_test):
from sklearn import tree
tree = tree.DecisionTreeRegressor()
tree.fit(x_train, y_train)
value = tree.score(x_test, y_test)
return "{0:.2f}".format(value)
def getTreeImportanceAndScore(tree, features, traget):
importance = tree.feature_importances_
score = tree.score(features, traget)
return importance, score
########################################################################################################################
from sklearn.tree import DecisionTreeClassifier
from sklearn.datasets import load_breast_cancer
from sklearn.model_selection import train_test_split # some documents still include the cross-validation option but it no more exists in version 18.0
import pylab as plt
cancer = load_breast_cancer()
X_train, X_test, y_train, y_test = train_test_split(cancer.data,
cancer.target,
stratify=cancer.target,
random_state=42)
tree = DecisionTreeClassifier(random_state=0)
tree.fit(X_train, y_train)
print("Accuracy on training set: {:.3f}".format(tree.score(X_train, y_train)))
print("Accuracy on test set: {:.3f}".format(tree.score(X_test, y_test)))
for i in range(2, 10):
tree = DecisionTreeClassifier(max_depth=i, random_state=0)
tree.fit(X_train, y_train)
export_graphviz(tree,
out_file="tree" + str(i) + ".dot",
class_names=["malignant", "benign"],
feature_names=cancer.feature_names,
impurity=False,
filled=True)
print("Accuracy on training set: {:.3f}".format(
tree.score(X_train, y_train)))
print("Accuracy on test set: {:.3f}".format(tree.score(X_test, y_test)))
yList = [predY10, predY30, predY50, predY70, usedTrainY]
yListName = [
'10% labeled', '30% labeled', '50% labeled', '70% labeled', 'All data'
]
semiRecord = []
for yIdx, y in enumerate(yList):
CV = cross_val_score(BaggingClassifier(cartTree,
max_samples=0.7,
max_features=1.0),
usedTrainX,
y,
cv=5).mean()
# CV = cross_val_score(ridge, usedTrainX, y, cv=5).mean()
tree = cartTree_bagging.fit(usedTrainX, y)
tree.fit(usedTrainX, y)
testScore = tree.score(usedTestX, usedTestY)
print(yListName[yIdx])
print('CV:\t{}'.format(CV))
print('Test:\t{}'.format(testScore))
semiRecord.append({'name': yListName[yIdx], 'CV': CV, 'test': testScore})
#%% 4. Predict(batch data)
from sklearn.cross_validation import train_test_split
x_batch_10 = usedTrainX[y_10 != -1]
y_batch_10 = usedTrainY[y_10 != -1]
x_batch_30 = usedTrainX[y_30 != -1]
y_batch_30 = usedTrainY[y_30 != -1]
x_batch_50 = usedTrainX[y_50 != -1]
y_batch_50 = usedTrainY[y_50 != -1]
from sklearn.ensemble import RandomForestClassifier
from sklearn.tree import DecisionTreeClassifier
income_data=pd.read_csv('income.csv', header=0, delimiter=', ')
print(income_data.iloc[0])
labels=income_data[["income"]]
income_data['sex-int']=income_data['sex'].apply(lambda x: 0 if x == 'Male' else 1)
income_data['country-int']=income_data['native-country'].apply(lambda y: 0 if y == 'United-State' else 1)
data = income_data[['age','capital-gain','capital-loss','hours-per-week','sex-int','country-int']]
train_data,test_data,train_labels,test_labels=train_test_split(data, labels, random_state=1)
forest=RandomForestClassifier(random_state=1)
forest.fit(train_data, train_labels)
#print(forest.feature_importances_)
print(forest.score(test_data, test_labels))
#comparison with Decision Tree
tree=DecisionTreeClassifier(random_state=1)
tree.fit(train_data, train_labels)
print(tree.score(test_data, test_labels))
#print(income_data['native-country'].value_counts())
lambda occ: 0 if occ in [
"Adm-clerical", "Armed-Forces", "Priv-house-serv", "Handlers-cleaners"
] else 1)
labels = income_data[["income"]]
data = income_data[[
"capital-gain", "capital-loss", "education-num", "occupation-int"
]]
train_data, test_data, train_labels, test_labels = train_test_split(
data, labels, random_state=1)
forest = RandomForestClassifier(n_estimators=150, random_state=2)
forest.fit(train_data, train_labels)
# Show importances of features
print("importances: ", forest.feature_importances_)
print(forest.score(test_data, test_labels)) # 84.45% correct
prediction = {}
for i in range(1, 20):
tree = DecisionTreeClassifier(random_state=2, max_depth=i)
tree.fit(train_data, train_labels)
prediction.update({i: tree.score(test_data, test_labels)})
print("Decision Tree best: ",
max(prediction.items(), key=operator.itemgetter(1))) # 84.47% correct
me = np.array([0, 0, 13, 1]).reshape(1, -1)
print("Random Forest Prediction of me: ", forest.predict(me))
