def adaBoostModel(train_x, train_y, test_x, test_y, workOrFreeDay):
rng = np.random.RandomState(1)
adaBoost = AdaboostR(DTR(max_depth=5), n_estimators=300, random_state=rng)
adaBoost.fit(train_x, train_y)
predicted = adaBoost.predict(test_x)
# show test results
printEvaluationScores(predicted, test_y, "AdaBoost model with MSFsc", workOrFreeDay)
# invokes method to print the tree structure of the 300 trained tree
#saveTreeStrucutre(adaBoost)
# Predict without MSFSC
x_trainWithoutMSFSC = train_x.copy()
x_testWithoutMSFSC = test_x.copy()
del x_trainWithoutMSFSC['MSFSC']
del x_testWithoutMSFSC['MSFSC']
adaBoost.fit(x_trainWithoutMSFSC, train_y)
predicted = adaBoost.predict(x_testWithoutMSFSC)
# show test results
printEvaluationScores(predicted, test_y, "AdaBoost model with without MSFsc", workOrFreeDay)
def test_DecitionTreeRegressor():
import numpy as np
import pandas as pd
from sklearn.datasets import load_boston
dataset = load_boston()
X, y, features = dataset['data'], dataset['target'], dataset[
'feature_names']
X = pd.DataFrame(X, columns=features)
y = pd.DataFrame(y, columns=['target'])
data = pd.concat([X, y], axis=1)
features = data.columns[:-1]
target = data.columns[-1]
from sklearn.model_selection import train_test_split
X_train, X_vali, y_train, y_vali = train_test_split(X,
y,
test_size=0.2,
random_state=23)
print('X_train shape: ', X_train.shape)
print('X_vali shape: ', X_vali.shape)
print('y_train shape: ', y_train.shape)
print('y_vali shape: ', y_vali.shape)
from ml.tree import DecisionTreeRegressor
from sklearn.tree import DecisionTreeRegressor as DTR
models = {}
models['my_dtr'] = DecisionTreeRegressor(max_depth=5)
models['sklearn_dtr'] = DTR(max_depth=5)
for name, model in models.items():
model.fit(X_train, y_train)
print('%s score: %.8f' % (name, model.score(X_vali, y_vali)))
def get_new_model(self):
if (self.model_type.split("_")[-1] == "Regressor"):
if (self.model_type == "Linear-Regressor"):
from sklearn.linear_model import LinearRegression
self.model = LinearRegression(**self.model_args)
elif (self.model_type == "Support-Vector-Regressor"):
import sklearn.svm as SVR
self.model = SVR(**self.model_args)
elif (self.model_type == "Decision-Tree-Regressor"):
from sklearn.tree import DecisionTreeRegressor as DTR
self.model = DTR(**self.model_args)
elif (self.model_type == "Random-Forest-Regressor"):
from sklearn.ensemble import RandomForestRegressor as RFR
self.model = RFR(**self.model_args)
else:
if (self.model_type == "Logistic-Regression-Classifier"):
from sklearn.linear_model import LogisticRegression
self.model = LogisticRegression(**self.model_args)
elif (self.model_type == "KNN-Classifier"):
from sklearn.neighbors import KNeighborsClassifier as KNN
self.model = KNN(**self.model_args)
elif (self.model_type == "Support-Vector-Classifier"):
import sklearn.svm as SVC
self.model = SVC(**self.model_args)
elif (self.model_type == "Naive-Bayes-Classifier"):
from sklearn.naive_bayes import GNB
self.model = GNB(**self.model_args)
elif (self.model_type == "Decision-Tree-Classifier"):
from sklearn.tree import DecisionTreeClassifier as DTC
self.model = DTC(**self.model_args)
elif (self.model_type == "Random-Forest-Classifier"):
from sklearn.ensemble import RandomForestClassifier as RFC
self.model = RFC(**self.model_args)
def show_bias_variance(feature_variables, n_test, n_train):
target_variable = 'Class'
X, Y = filter_data(feature_variables)
n_x = len(X)
random_test_index = random.sample(range(n_x), n_test)
X_test = [X[i] for i in random_test_index]
Y_test = [[Y[i]] for i in random_test_index]
max_df = 30
dfs = range(1, max_df+1) #max_depth
result = {i: [] for i in dfs}
train_pool_index = [i for i in range(n_x) if i not in random_test_index]
train_indexes = []
for i in range(50):
train_indexes_sample = random.sample(train_pool_index, n_train)
as_list = sorted(train_indexes_sample)
train_indexes.append(as_list)
for df in dfs:
model = DTR(max_depth = df, max_features=len(feature_variables))
prediction_errors = []
training_errors = []
for i in range(50):
X_train = [X[j] for j in train_indexes[i]]
Y_train = [[Y[j]] for j in train_indexes[i]]
model.fit(X_train, Y_train)
y_predict = model.predict(X_test)
y_predict_train = model.predict(X_train)
mse = statistics.mean([(y_predict[j]-Y_test[j][0])**2 for j in range(n_test)])
mse_train = statistics.mean([(y_predict_train[j]-Y_train[j][0])**2 for j in range(n_train)])
prediction_errors.append(mse)
training_errors.append(mse_train)
result[df].append(prediction_errors)
result[df].append(statistics.mean(prediction_errors))
result[df].append(training_errors)
result[df].append(statistics.mean(training_errors))
fig, ax = plt.subplots()
sort_dfs = sorted(dfs)
for i in range(max_df):
ax.plot(sort_dfs, [result[df][0][i] for df in sort_dfs], '-', color = (1,0.2,0,0.25), lw = 2)
p=ax.plot(sort_dfs, [result[df][1] for df in sort_dfs], '-', color = (1,0,0,1), lw = 1.5)
p[0].set_label("Expected Test Error Estimate")
for i in range(max_df):
ax.plot(sort_dfs, [result[df][2][i] for df in sort_dfs], '-', color = (0,0.2,1,0.25), lw = 2)
p=ax.plot(sort_dfs, [result[df][3] for df in sort_dfs], '-', color = (0,0,1,1), lw = 1.5)
p[0].set_label("Expected Training Error Estimate")
ax.legend()
ax.set_xlabel('Max Depth')
ax.set_ylabel('Prediction Error')
fig.show()
def function(Xt, Xy, Yt, Yy, weight, dynamic=False):
for i in range(50):
estimator = DTR(max_depth=5, random_state=42)
if i == 0:
estimator.fit(X_train, y_train)
else:
estimator.fit(
X_train, square_grad(y_train, gbm_predict(X_train, ests,
coef)))
ests.append(estimator)
if (dynamic):
coef.append(weight / (1 + i))
else:
coef.append(weight)
return MSE(y_test, gbm_predict(X_test, ests, coef))
def test_gbdt():
import numpy as np
import pandas as pd
from sklearn.datasets import load_boston
dataset = load_boston()
X, y, features = dataset['data'], dataset['target'], dataset[
'feature_names']
X = pd.DataFrame(X, columns=features)
y = pd.DataFrame(y, columns=['target'])
data = pd.concat([X, y], axis=1)
features = data.columns[:-1]
target = data.columns[-1]
from sklearn.model_selection import train_test_split
X_train, X_vali, y_train, y_vali = train_test_split(X,
y,
test_size=0.2,
random_state=25)
print('X_train shape: ', X_train.shape)
print('X_vali shape: ', X_vali.shape)
print('y_train shape: ', y_train.shape)
print('y_vali shape: ', y_vali.shape)
from sklearn.tree import DecisionTreeRegressor as DTR
dtr = DTR(max_depth=5)
dtr.fit(X_train, y_train.values.reshape(-1))
print('sklearn dtr score: ', dtr.score(X_vali, y_vali))
from sklearn.ensemble import GradientBoostingRegressor as GBR
import xgboost as xgb
gbr = GBR(max_depth=5)
gbr.fit(X_train, y_train)
print('sklearn gbr score: ', gbr.score(X_vali, y_vali))
from ml.tree import DecisionTreeRegressor
mydtr = DecisionTreeRegressor(max_depth=5)
mydtr.fit(X_train, y_train)
print('my dtr score: ', mydtr.score(X_vali, y_vali))
from ml.ensemble import GradientBoostingRegressor
mygbr = GradientBoostingRegressor()
mygbr.fit(X_train, y_train)
print('my gbr score: ', mygbr.score(X_vali, y_vali))
def adaBoostModelWithCrossFoldValidation(inputData, outputData, workOrFreeDay):
rng = np.random.RandomState(1)
adaBoost = AdaboostR(DTR(max_depth=5), n_estimators=300, random_state=rng)
# do leave one-out cross prediction
adaBoostPredict = cross_val_predict(adaBoost, inputData, outputData, cv=len(inputData))
# show test results
printEvaluationScores(adaBoostPredict, outputData, "AdaBoost model with MSFsc and LOO prediction", workOrFreeDay)
# Predict without MSFSC
dataWithoutMSFSC = inputData.copy()
del dataWithoutMSFSC['MSFSC']
adaBoostPredict = cross_val_predict(adaBoost, dataWithoutMSFSC, outputData, cv=len(inputData))
# show test results
printEvaluationScores(adaBoostPredict, outputData, "AdaBoost model without MSFsc and LOO prediction", workOrFreeDay)
def __init__(self,
criterion='mse',
splitter='best',
max_depth=None,
min_samples_split=2,
min_samples_leaf=1,
min_weight_fraction_leaf=0.0,
max_features=None,
random_state=None,
max_leaf_nodes=None,
min_impurity_decrease=0.0,
min_impurity_split=None,
ccp_alpha=0.0):
self.max_leaf_nodes = max_leaf_nodes
self.min_samples_split = min_samples_split
self.random_state = random_state
self.min_samples_leaf = min_samples_leaf
self.ccp_alpha = ccp_alpha
self.min_impurity_decrease = min_impurity_decrease
self.max_features = max_features
self.splitter = splitter
self.max_depth = max_depth
self.min_weight_fraction_leaf = min_weight_fraction_leaf
self.min_impurity_split = min_impurity_split
self.criterion = criterion
self.model = DTR(
ccp_alpha=self.ccp_alpha,
min_impurity_decrease=self.min_impurity_decrease,
min_weight_fraction_leaf=self.min_weight_fraction_leaf,
min_impurity_split=self.min_impurity_split,
splitter=self.splitter,
min_samples_split=self.min_samples_split,
max_leaf_nodes=self.max_leaf_nodes,
max_depth=self.max_depth,
min_samples_leaf=self.min_samples_leaf,
max_features=self.max_features,
criterion=self.criterion,
random_state=self.random_state)
def bagging(X_train, y_train, X_test, boot_count, depth):
trees = np.array([DTR(max_depth=depth) for _ in range(0, boot_count)])
X_train_bootstrap = np.array([])
y_train_bootstrap = np.array([])
# Формирование трейн-выборок бутстрэпом:
for i in range(0, boot_count):
for j in range(0, X_train.shape[0]):
random_index = random.choice(
[i for i in range(0, X_train.shape[0])])
X_train_bootstrap = np.append(X_train_bootstrap,
X_train[random_index])
y_train_bootstrap = np.append(y_train_bootstrap,
y_train[random_index])
X_train_bootstrap = X_train_bootstrap.reshape(boot_count, X_train.shape[0],
X_train.shape[1])
y_train_bootstrap = y_train_bootstrap.reshape(boot_count, X_train.shape[0])
# Обучаем деревья на трейн-выборках:
fitted_trees = np.array([
trees[i].fit(X_train_bootstrap[i], y_train_bootstrap[i])
for i in range(0, boot_count)
])
# Предсказываем ансамблем деревьев:
y_predicts = np.array([tree.predict(X_test) for tree in fitted_trees])
y_predicts = y_predicts.reshape(boot_count, X_test.shape[0])
# Усреднение
y_pred = np.array([])
for i in range(0, X_test.shape[0]):
mean_value = 0
for j in range(0, boot_count):
mean_value += y_predicts[j][i]
mean_value = mean_value / boot_count
y_pred = np.append(y_pred, mean_value)
return y_pred
PAR(C=1.0,
fit_intercept=False,
tol=None,
shuffle=True,
verbose=1,
loss='epsilon_insensitive',
epsilon=0.01,
random_state=rng),
'svr_rbf':
SVR(kernel='rbf', C=1e3, shrinking=True, verbose=True),
'svr_ply':
SVR(kernel='poly', C=1e3, degree=3, shrinking=True, verbose=True),
'gpr':
GPR(kernel=None, alpha=1e-10, optimizer='fmin_l_bfgs_b', random_state=rng),
'dtr':
DTR(max_depth=10),
'kr_rbf':
KernelRidge(kernel='rbf', gamma=0.1, alpha=1e-2),
'kr_ply':
KernelRidge(kernel='poly', gamma=10.1, alpha=1e-2, degree=3),
'mlp_r':
MLPRegressor(
hidden_layer_sizes=(
10,
8,
5,
),
activation='tanh',
solver='adam', #'lbfgs', #
alpha=0.0001,
batch_size=32,
def getDTC(data, target, depth):
Y = data[target]
X = data.drop(target, axis=1)
model = DTR(max_depth=depth)
return model
})
df_['Category of interaction'] = df_['Category of interaction'].map({
'positive':
1,
'negative':
-1,
'neutral':
0
})
#### seperating dependent and independent variables
x = df_.drop(['Churn date'], axis=1)
y = df_['Churn date']
#splitting into training and testdata
from sklearn.model_selection import train_test_split
train_x, test_x, train_y, test_y = train_test_split(x,
y,
random_state=23,
test_size=0.3)
from sklearn.tree import DecisionTreeRegressor as DTR
dtr = DTR(max_depth=41, random_state=23)
dtr.fit(train_x, train_y)
pickle.dump(dtr, open('model.pkl', 'wb'))
model = pickle.load(open('model.pkl', 'rb'))
print(model.predict([[737000, 737002, 0]]))
for i in range(0, len(y)):
if y[i] == 0:
y[i] = 1
from sklearn.model_selection import train_test_split as tts
X_train, X_test, y_train, y_test = tts(X, y, test_size=0.2, random_state=0)
from sklearn.linear_model import LinearRegression as LR
reg = LR()
reg.fit(X_train, y_train)
y_pred = reg.predict(X_test)
y_pred_train = reg.predict(X_train)
Table(y_pred, y_pred_train, y_train, y_test, 'LR', X_train, X_test)
from sklearn.tree import DecisionTreeRegressor as DTR
reg = DTR()
reg.fit(X_train, y_train)
y_pred = reg.predict(X_test)
y_pred_train = reg.predict(X_train)
Table(y_pred, y_pred_train, y_train, y_test, 'DTR', X_train, X_test)
from sklearn.ensemble import RandomForestRegressor as RF
reg = RF()
reg.fit(X_train, y_train)
y_pred = reg.predict(X_test)
y_pred_train = reg.predict(X_train)
Table(y_pred, y_pred_train, y_train, y_test, 'RFR', X_train, X_test)
plotting(y_pred, 'RFR')
from lightgbm import LGBMRegressor as lgb
reg = lgb()
# In[21]:
from sklearn.tree import DecisionTreeRegressor as DTR
from sklearn.model_selection import RandomizedSearchCV
parameters={"splitter":["best","random"],
"max_depth" : [1,3,5,7,9,11,12],
"min_samples_leaf":[1,2,3,4,5,6,7,8,9,10],
"min_weight_fraction_leaf":[0.1,0.2,0.3,0.4,0.5],
"max_features":["auto","log2","sqrt",None],
"max_leaf_nodes":[None,10,20,30,40,50,60,70,80,90]
}
randGrid = RandomizedSearchCV(DTR(), parameters, cv=10, scoring='r2', n_iter=1000, verbose=1, n_jobs=3)
randGrid.fit(xall, yall)
print(randGrid.best_params_)
print(randGrid.best_score_)
# In[22]:
parameters={"splitter":["best","random"],
"max_depth" : [1,3,5,7,9,11,12],
"min_samples_leaf":[1,2,3,4,5,6,7,8,9,10],
# "min_weight_fraction_leaf":[0.1,0.2,0.3,0.4,0.5],
"max_features":["auto","log2","sqrt",None],
# "max_leaf_nodes":[None,10,20,30,40,50,60,70,80,90]
}
display(samples - np.round(data.mean())) display(samples - np.round(data.median())) from sklearn.tree import DecisionTreeRegressor as DTR from sklearn.metrics import accuracy_score from sklearn import cross_validation # Make a copy of the DataFrame, using the 'drop' function to drop the given feature new_data = data.drop(['Frozen'], axis=1, inplace=False) # Split the data into training and testing sets using the given feature as the target new_y = data.drop(['Fresh','Milk','Grocery','Detergents_Paper','Delicatessen'], axis=1, inplace=False) X_train, X_test, y_train, y_test = cross_validation.train_test_split(new_data, new_y, test_size=0.25, random_state=42) # Create a decision tree regressor and fit it to the training set regressor = DTR(random_state=42) regressor.fit(X_train, y_train) # Report the score of the prediction using the testing set score = regressor.score(X_test, y_test) print(score) # Scale the data using the natural logarithm log_data = np.log(data) # Scale the sample data using the natural logarithm log_samples = np.log(samples) # Produce a scatter matrix for each pair of newly-transformed features pd.scatter_matrix(log_data, alpha = 0.3, figsize = (14,8), diagonal = 'kde');
# loading original dataset
data = pd.read_csv(path + 'SPP+.csv')
# arranging features from original dataset for model learning
x = data.drop([
'Wavelength (nm)', 'Width (nm)', 'AspectRatio', 'Length (nm)',
'Linewidth (nm)', 'MaxCscat'
],
axis=1)
w_y = data['Width (nm)']
l_y = data['Length (nm)']
# parameters for GridSearchCV class
param_grid = {'max_depth': range(1, 31)}
# Initialize GridSearchCV class
width_gs = GridSearchCV(estimator=DTR(),
param_grid=param_grid,
cv=10,
scoring='neg_mean_squared_error')
length_gs = GridSearchCV(estimator=DTR(),
param_grid=param_grid,
cv=10,
scoring='neg_mean_squared_error')
width_gs.fit(x, w_y)
length_gs.fit(x, l_y)
joblib_width_file = "joblib_width_gs.pkl"
joblib.dump(width_gs, joblib_width_file)
joblib_length_file = "joblib_length_gs.pkl"
def __init__(self, featureset=None, target=None, mode='predict', path=''):
if (mode == 'train'):
self.__svm = SVC(C=1.0,
cache_size=200,
class_weight=None,
coef0=0.0,
decision_function_shape='ovr',
degree=3,
gamma='auto',
kernel='rbf',
max_iter=-1,
probability=False,
random_state=None,
shrinking=True,
tol=0.001,
verbose=False)
self.__svr = SVR(C=1.0,
cache_size=200,
coef0=0.0,
degree=3,
epsilon=0.1,
gamma='auto',
kernel='rbf',
max_iter=-1,
shrinking=True,
tol=0.001,
verbose=False)
self.__nusvm = NuSVC(cache_size=200,
class_weight=None,
coef0=0.0,
decision_function_shape='ovr',
degree=3,
gamma='auto',
kernel='rbf',
max_iter=-1,
nu=0.5,
probability=False,
random_state=None,
shrinking=True,
tol=0.001,
verbose=False)
self.__nusvr = NuSVR(C=1.0,
cache_size=200,
coef0=0.0,
degree=3,
gamma='auto',
kernel='rbf',
max_iter=-1,
nu=0.5,
shrinking=True,
tol=0.001,
verbose=False)
self.__linsvm = LinearSVC(C=1.0,
class_weight=None,
dual=True,
fit_intercept=True,
intercept_scaling=1,
loss='squared_hinge',
max_iter=1000,
multi_class='ovr',
penalty='l2',
random_state=None,
tol=0.0001,
verbose=0)
self.__linsvr = LinearSVR(C=1.0,
dual=True,
epsilon=0.0,
fit_intercept=True,
intercept_scaling=1.0,
loss='epsilon_insensitive',
max_iter=1000,
random_state=None,
tol=0.0001,
verbose=0)
self.__mlpc = MLPC(activation='relu',
alpha=1e-05,
batch_size='auto',
beta_1=0.9,
beta_2=0.999,
early_stopping=False,
epsilon=1e-08,
hidden_layer_sizes=(100, 25),
learning_rate='constant',
learning_rate_init=0.001,
max_iter=200,
momentum=0.9,
nesterovs_momentum=True,
power_t=0.5,
random_state=1,
shuffle=True,
solver='lbfgs',
tol=0.0001,
validation_fraction=0.1,
verbose=False,
warm_start=False)
self.__mlpr = MLPR(activation='relu',
alpha=0.0001,
batch_size='auto',
beta_1=0.9,
beta_2=0.999,
early_stopping=False,
epsilon=1e-08,
hidden_layer_sizes=(100, 25),
learning_rate='constant',
learning_rate_init=0.001,
max_iter=200,
momentum=0.9,
nesterovs_momentum=True,
power_t=0.5,
random_state=None,
shuffle=True,
solver='adam',
tol=0.0001,
validation_fraction=0.1,
verbose=False,
warm_start=False)
self.__dtc = DTC(class_weight=None,
criterion='gini',
max_depth=None,
max_features=None,
max_leaf_nodes=None,
min_impurity_decrease=0.0,
min_impurity_split=None,
min_samples_leaf=1,
min_samples_split=2,
min_weight_fraction_leaf=0.0,
presort=False,
random_state=None,
splitter='best')
self.__dtr = DTR(criterion='mse',
max_depth=None,
max_features=None,
max_leaf_nodes=None,
min_impurity_decrease=0.0,
min_impurity_split=None,
min_samples_leaf=1,
min_samples_split=2,
min_weight_fraction_leaf=0.0,
presort=False,
random_state=None,
splitter='best')
self.__rfc = RFC(bootstrap=True,
class_weight=None,
criterion='gini',
max_depth=100,
max_features='auto',
max_leaf_nodes=None,
min_impurity_decrease=0.0,
min_impurity_split=None,
min_samples_leaf=1,
min_samples_split=2,
min_weight_fraction_leaf=0.0,
n_estimators=50,
n_jobs=1,
oob_score=False,
random_state=None,
verbose=0,
warm_start=False)
self.__rfr = RFR(bootstrap=True,
criterion='mse',
max_depth=None,
max_features='auto',
max_leaf_nodes=None,
min_impurity_decrease=0.0,
min_impurity_split=None,
min_samples_leaf=1,
min_samples_split=2,
min_weight_fraction_leaf=0.0,
n_estimators=10,
n_jobs=1,
oob_score=False,
random_state=None,
verbose=0,
warm_start=False)
(self.__svm, self.__svr, self.__nusvm, self.__nusvr, self.__linsvm,
self.__linsvr, self.__mlpc, self.__mlpr, self.__dtc, self.__dtr,
self.__rfc, self.__rfr) = self.__trainAll(X=list(featureset),
Y=list(target))
self.__saveModelsToFile(path)
else:
self.__svm = joblib.load(path + 'Mel_SVM.pkl')
self.__svr = joblib.load(path + 'Mel_SVR.pkl')
self.__nusvm = joblib.load(path + 'Mel_NuSVM.pkl')
self.__nusvr = joblib.load(path + 'Mel_NuSVR.pkl')
self.__linsvm = joblib.load(path + 'Mel_LinSVM.pkl')
self.__linsvr = joblib.load(path + 'Mel_LinSVR.pkl')
self.__mlpc = joblib.load(path + 'Mel_MLPC.pkl')
self.__mlpr = joblib.load(path + 'Mel_MLPR.pkl')
self.__dtc = joblib.load(path + 'Mel_DTC.pkl')
self.__dtr = joblib.load(path + 'Mel_DTR.pkl')
self.__rfc = joblib.load(path + 'Mel_RFC.pkl')
self.__rfr = joblib.load(path + 'Mel_RFR.pkl')
trees[i].fit(X_train_bootstrap[i], y_train_bootstrap[i])
for i in range(0, boot_count)
])
# Предсказываем ансамблем деревьев:
y_predicts = np.array([tree.predict(X_test) for tree in fitted_trees])
y_predicts = y_predicts.reshape(boot_count, X_test.shape[0])
# Усреднение
y_pred = np.array([])
for i in range(0, X_test.shape[0]):
mean_value = 0
for j in range(0, boot_count):
mean_value += y_predicts[j][i]
mean_value = mean_value / boot_count
y_pred = np.append(y_pred, mean_value)
return y_pred
X, y = load_boston(return_X_y=True)
X_train, X_test, y_train, y_test = train_test_split(X,
y,
test_size=0.3,
random_state=123,
shuffle=True)
y_pred = bagging(X_train, y_train, X_test, boot_count=200, depth=10)
y_dt_pred = DTR().fit(X_train, y_train).predict(X_test)
y = RandomForestRegressor().fit(X_train, y_train).predict(X_test)
print(mean_squared_error(y, y_test))
print(mean_squared_error(y_dt_pred, y_test))
print(mean_squared_error(y_pred, y_test))
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
#Importing the dataset
dataset = pd.read_csv("D:\work\ML A to Z\Own\Regression\Faces.csv")
#Matrix and vector
X = dataset.iloc[:, 1:5].values
y = dataset.iloc[:, 5].values
#training and test set
from sklearn.model_selection import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X,
y,
test_size=0.2,
random_state=0)
#Regressor
from sklearn.tree import DecisionTreeRegressor as DTR
regressor = DTR()
regressor.fit(X_train, y_train)
#prediction
y_pred = regressor.predict(X_test)
#Plotting
plt.scatter(X_test, y_test, color="red")
plt.plot(X_test, regressor.predict(X_test), color="blue")
plt.show()
# some_prepared = full_pipeline.transform(some_data)
# print("Predictions: ", lr.predict(some_prepared))
# print("Original Labels: ", list(some_labels))
# 可以看出預測結果差的離譜(代表資料的擬合不足 underfitting)
# 透過 Scikit-Learn mean_squared_error 來計算整個訓練資料上回歸模型的RMSE
from sklearn.metrics import mean_squared_error
housing_predictions = lr.predict(housing_prepared)
# lr_mse = mean_squared_error(housing_labels, housing_predictions)
# rmse = np.sqrt(lr_mse)
# print("RMSE: ", rmse) # 預測誤差 68628.19819848923 美元
# 因此對於擬合不足的模型, 可以選用更強大的模型或是提供更好的特徵, 減少限制等等
# 這裡則更換更強大的模型 DecisionTreeRegressor
from sklearn.tree import DecisionTreeRegressor as DTR
tree_reg = DTR()
tree_reg.fit(housing_prepared, housing_labels)
predicted = tree_reg.predict(housing_prepared)
# mse = mean_squared_error(housing_labels, predicted)
# rmse = np.sqrt(mse)
# print("RMSE: ", rmse) # RMSE: 0.0
# 這裡的結果正確率是100%, 但要考慮是否過度擬合 Overfitting
# 因此, 要使用交叉驗證來進行更好的評估模型
from sklearn.model_selection import cross_val_score as cvs
scores = cvs(tree_reg, housing_prepared, housing_labels, scoring = "neg_mean_squared_error", cv = 10)
rmse_scores = np.sqrt(-scores)
# Scikit-Learn 交叉驗證更傾向於效用函數(越大越好), 而不是成本函數(越小越好), 所以計算分數實際上是負的MSE
# 來查看結果
def display_score(scores):
print("Score: ", scores)
z = sqrt(mean_squared_error(y_test, predicted))
print('RMS Evaluation: {}'.format(z))
print('Prediction/Fit Run Time: {}\n'.format(elapsed_time))
print("Bayesian Ridge:")
model = BR()
start_time = time.time()
model.fit(X_train, y_train)
predicted = model.predict(X_test)
elapsed_time = time.time() - start_time
z = sqrt(mean_squared_error(y_test, predicted))
print('RMS Evaluation: {}'.format(z))
print('Prediction/Fit Run Time: {}\n'.format(elapsed_time))
print("Decision Tree Regression:")
model = DTR(max_depth=3)
start_time = time.time()
model.fit(X_train, y_train)
predicted = model.predict(X_test)
elapsed_time = time.time() - start_time
z = sqrt(mean_squared_error(y_test, predicted))
print('RMS Evaluation: {}'.format(z))
print('Prediction/Fit Run Time: {}\n'.format(elapsed_time))
print("Linear Regression:")
model = LNR()
start_time = time.time()
model.fit(X_train, y_train)
predicted = model.predict(X_test)
elapsed_time = time.time() - start_time
z = sqrt(mean_squared_error(y_test, predicted))
def main():
# ----------------------------
# Training data
# ----------------------------
# Loading training data
trainingDataFile = 'Training_set.csv'
trainingData = pd.read_csv(trainingDataFile)
# Obtaining unique cases of events (Note: This remains the same for both training and test data)
myEventSet = []
for x in trainingData.events:
if x not in myEventSet:
myEventSet.append(x)
print('Unique events are as follows: \n', myEventSet,'\n')
# Event string value reassignment based on unique event cases in 'myEventSet'
newEvents = []
for x in trainingData.events:
for i in range(len(myEventSet)):
if x == myEventSet[i]:
newEvents.append(i)
# Converting datetime to Seconds and saving day of the week
day = []
numDateTrainData = []
for i in range(len(trainingData.date)):
date_obj = datetime.strptime(str(trainingData.date[i]), '%Y-%m-%d')
numDateTrainData.append(date_obj.timestamp())
day.append(date_obj.weekday())
#print(trainingData.date)
dictReqCount = {}
for i in range(len(trainingData.date)):
if day[i] not in dictReqCount.keys():
dictReqCount[day[i]] = []
dictReqCount[day[i]].append(trainingData.request_count[i])
#print(dictReqCount)
dictAvgReqCount = {}
for key,val in dictReqCount.items():
dictAvgReqCount[key] = sum(val)/len(val)
#print(dictAvgReqCount)
maxValue = max(dictAvgReqCount.values())
maxKey = [key for key,val in dictAvgReqCount.items() if val == maxValue]
print('Day #{} of the week has the max mean request count'.format(maxKey[0]))
minValue = min(dictAvgReqCount.values())
minKey = [key for key, val in dictAvgReqCount.items() if val == minValue]
print('Day #{} of the week has the min mean request count'.format(minKey[0]))
# Assembling feature arrays
features_trainingData = []
for i in range(len(numDateTrainData)):
row = [numDateTrainData[i], day[i], trainingData.calendar_code[i], trainingData.site_count[i], trainingData.max_temp[i], trainingData.min_temp[i], trainingData.precipitation[i], newEvents[i]];
features_trainingData.append(row)
#for i in range(len(features_trainingData)):
# print(len(features_trainingData[i]))
#Y = list(trainingData.request_count)
Y = trainingData.request_count
X = features_trainingData
#print('length of Y =', len(Y))
#print(features_trainingData)
# Models that work on both continuous and discrete data
scoring = 'neg_mean_squared_error'
models = [DTR(),GNB(),RFR(),KNR()]
'''models = [[DTR(), DTR(max_depth=2), DTR(max_depth=5)],
[GNB(), GNB(priors=None)],
[RFR(), RFR(), RFR()],
[KNR(), KNR(), KNR()]]
'''
seed = 7
kfold = MS.KFold(n_splits=10, random_state=seed)
i = 0
mErr = []
for model in models:
results = MS.cross_val_score(model, X, Y, cv=kfold, scoring=scoring)
mErr.append(results.mean())
i += 1
#print(mErr)
best_model_index = 0
maxAbsErrInd = math.fabs(mErr[0])
for i in range(1, len(mErr)):
if (math.fabs(mErr[i]) < maxAbsErrInd):
best_model_index = i
maxAbsErrInd = math.fabs(mErr[i])
print('\nModel #%d (i.e. %s) performed best' %(best_model_index, str(models[best_model_index]).split('(')[0]))
# -------------------------------------------------------
# Test Data
# -------------------------------------------------------
# Loading test data
testDataFile = 'Test_set.csv'
testData = pd.read_csv(testDataFile)
# Event string reassignment using myEventSet from training data
newEvents = []
for x in testData.events:
for i in range(len(myEventSet)):
if x == myEventSet[i]:
newEvents.append(i)
# Converting datetime to Seconds and determining days of the week
day = []
numDateTestData = []
for i in range(len(testData.date)):
date_obj = datetime.strptime(str(testData.date[i]), '%Y-%m-%d')
numDateTestData.append(date_obj.timestamp())
day.append(date_obj.weekday())
# Assembling feature arrays
features_testData = []
for i in range(len(numDateTestData)):
row = [numDateTestData[i], day[i], testData.calendar_code[i], testData.site_count[i], testData.max_temp[i],
testData.min_temp[i], testData.precipitation[i], newEvents[i]];
features_testData.append(row)
# Test data features
X_test = features_testData
# Test data prediction
bestModel = models[best_model_index]
Y_pred = bestModel.fit(X, Y).predict(X_test)
Y_pred_train = bestModel.fit(X, Y).predict(X)
print('\nThe predicted values for request count using the test data is as follows:\n',Y_pred)
output_file = open('predicted_request_count.csv','w')
for i in range(len(Y_pred)):
output_file.write(str(Y_pred[i])+'\n')
output_file.close()
# Plot the results
plt.figure(1)
plt.scatter(numDateTrainData, Y, c="darkorange", label="Training data")
plt.scatter(numDateTestData, Y_pred, c="cornflowerblue", label="Test data model prediction")
plt.scatter(numDateTrainData, Y_pred_train, c="red", label="Training data model prediction")
plt.xlabel("Numerical Date")
plt.ylabel("Page Count")
plt.title("Best Model")
plt.legend()
plt.show()
for i in data1.columns:
if data1[i].dtype ==object:
print(i)
data1 =cat_to_num(data1,i)
data1.drop(['gender','ssc_b','hsc_b','degree_t'],inplace =True,axis =1)
x = data1
y = data1['salary']
from sklearn.model_selection import train_test_split
x_train,x_test,y_train,y_test = train_test_split(x,y,test_size = 0.2)
from sklearn.tree import DecisionTreeRegressor as DTR
regr = DTR()
regr.fit(x_train,y_train)
from sklearn.linear_model import LogisticRegression
model = LogisticRegression()
model.fit(x_train,y_train)
from sklearn.ensemble import RandomForestRegressor
rf = RandomForestRegressor(n_estimators = 1000, random_state = 42)
rf.fit(x_test, y_test);
from sklearn.metrics import r2_score
print(r2_score(y_test,regr.predict(x_test)))
ax1 = sns.distplot(y_test,hist=False,color ="r",label ="Actual Value")
sns.distplot(regr.predict(x_test),color ="b",hist = False,label = "Preicted Value",ax =ax1)
def trainDecisionTreeModel(inputData, outputData, workOrFreeDay):
regressor = DTR(random_state=0, max_depth = 5)
predicted = cross_val_predict(regressor, inputData, outputData, cv=10)
printEvaluationScores(predicted, outputData, "Simple DecisionTree", workOrFreeDay)
plt.xlabel('Date');
# So this is as far as a linear regression will go. This gives us a baseline $R^2$ of 61.2% to build from with a more complicated model.
#
# The most obvious thing that will need to be improved is the fact that negative radiation is impossible. Therefore, we will need a model that can deal with this.
# ## Decision Tree Algorithm
# In[32]:
from sklearn.tree import DecisionTreeRegressor as DTR
# fit random forest
dt = DTR()
dt.fit(X_train, y_train)
# In[33]:
dt.score(X=X_test, y=y_test)
# In[34]:
# predict using the random forest model
y_pred = dt.predict(X_test)
enet_msq = msq(enet.predict(X_test), y_test)
enet_r2 = r2(enet.predict(X_test), y_test)
print('\nThe mean squared error of the ElasticNet model is: \t\t\t%s' %
enet_msq)
print('The R2 score of the ElasticNet model is: \t\t\t\t%s' % enet_r2)
# =============================================================================
# TREE CLASSIFICATIONS
# =============================================================================
from sklearn.tree import DecisionTreeRegressor as DTR
from sklearn.tree import DecisionTreeClassifier as DTC
from sklearn.neighbors import KNeighborsRegressor as KNR
from sklearn.neighbors import KNeighborsClassifier as KNC
# DECISION TREE REGRESSOR
dtr = DTR()
dtr.fit(X_train, y_train)
dtr_msq = msq(dtr.predict(X_test), y_test)
dtr_r2 = r2(dtr.predict(X_test), y_test)
print(
'\nThe mean squared error of the Decision Tree Regressor model is: \t%s' %
dtr_msq)
print('The R2 score of the Decision Tree Regressor model is: \t\t\t%s' %
dtr_r2)
# DECISION TREE CLASSIFIER
dtc = DTC()
dtc.fit(X_train, y_train)
dtc_msq = msq(dtc.predict(X_test), y_test)
dtc_r2 = r2(dtc.predict(X_test), y_test)
print(
"""
##############################Regression##############################
"""
from sklearn.metrics import mean_squared_error
#k-Neighbors Regressor
from sklearn.neighbors import KNeighborsRegressor as KNR
knr_energy = KNR(weights='distance').fit(X_train_energy_pca, y_train_energy)
y_pred_knr = knr_energy.predict(X_test_energy_pca)
print("Mean squared error for kNN: {:.3f}.".format(
mean_squared_error(y_pred_knr, y_test_energy)))
#Decision Tree Regressor
from sklearn.tree import DecisionTreeRegressor as DTR
dtr_energy = DTR(max_depth=11,
min_samples_split=16,
min_samples_leaf=2,
random_state=37).fit(X_train_energy_stand, y_train_energy)
y_pred_dtr = dtr_energy.predict(X_test_energy_stand)
print("Mean squared error for DTR: {:.3f}.".format(
mean_squared_error(y_pred_dtr, y_test_energy)))
#Random Forest Regressor
from sklearn.ensemble import RandomForestRegressor as RFR
rfr_energy = RFR(n_estimators=100,
min_samples_leaf=2,
max_leaf_nodes=1000,
random_state=37).fit(X_train_energy, y_train_energy)
y_pred_rfr = rfr_energy.predict(X_test_energy)
print("Mean squared error for RFR: {:.3f}.".format(
mean_squared_error(y_pred_rfr, y_test_energy)))
mydata = mydata.loc[myreturn.index]
myreturn = myreturn.sort_values(ascending=False)
total = len(myreturn.index)
#mark the first 1/3 stocks (by return) as 1, and the last 1/3 as 0
top_index = myreturn.index[:int(total/3)]
bottom_index = myreturn.index[int(total*2/3):]
top = mydata.loc[top_index]
bottom = mydata.loc[bottom_index]
top['target'] = myreturn.loc[top_index]
bottom['target'] = myreturn.loc[bottom_index]
mydata = pd.concat([top,bottom],axis=0).dropna(axis=0)
target = mydata.pop('target')
#train a new regression tree of today
dtr = DTR(max_depth=m_depth)
mytrees = []
myscores = []
for i in range(0,num_trees):
train_X,test_X, train_y, test_y = train_test_split(mydata,target,test_size = 0.2,random_state = 11+2*i)
newresult = dtr.fit(train_X,train_y)
mytrees.append(newresult)
y_predict = pd.Series(newresult.predict(test_X))
test_y = pd.Series(test_y)
test_y = test_y.sort_values(ascending=False)
for rank in range(0,int(len(test_y)/2)):
test_y[rank] = 1
for rank in range(int(len(test_y)/2),len(test_y)):
test_y[rank] = 0
test_y = test_y.sort_index().tolist()
print("\nMean squared error for Linear Regression: {:.3f}.".format(
mean_squared_error(LinReg_y_pred, y_test)))
plt.scatter(LinReg_y_pred, y_test, c='green')
"""
####################Ridge Regression####################
"""
ridge = Ridge().fit(X_train, y_train)
Ridge_y_pred = ridge.predict(X_test)
print("\nMean squared error for Ridge Regression: {:.3f}.".format(
mean_squared_error(Ridge_y_pred, y_test)))
plt.scatter(Ridge_y_pred, y_test, c='red')
"""
####################Regression Tree####################
"""
#No changes
R_tree = DTR(random_state=37).fit(X_train, y_train)
RT_y_pred = R_tree.predict(X_test)
print("\nMean squared error for Regression Tree: {:.3f}.".format(
mean_squared_error(RT_y_pred, y_test)))
#Depth set to 11
R_tree = DTR(max_depth=11, random_state=37).fit(X_train, y_train)
RT_y_pred = R_tree.predict(X_test)
print("\tDepth set to 11: {:.3f}.".format(mean_squared_error(
RT_y_pred, y_test)))
#Min samples split set to 16
R_tree = DTR(min_samples_split=16, random_state=37).fit(X_train, y_train)
RT_y_pred = R_tree.predict(X_test)
print("\tMin samples split set to 16: {:.3f}.".format(
mean_squared_error(RT_y_pred, y_test)))
def train_some_model(X, X_cat, y, model='linear', params=None):
ada_scores = []
ridge_scores = []
gbr_scores = []
linear_scores = []
knn_scores = []
k = 0
K = 10
for train, test in model_selection.KFold(K, shuffle=True).split(X, y):
X_train, X_test, y_train, y_test = X.iloc[train], X.iloc[test], y.iloc[
train], y.iloc[test]
X_cat_train, X_cat_test = X_cat.iloc[train], X_cat.iloc[test]
sale_price_mean = X_cat_train['SalePrice'].mean()
for c in X_cat.columns:
if c == 'SalePrice':
continue
hood_price = X_cat_train.groupby(
c)['SalePrice'].mean().reset_index()
hood_price.columns = [c, c + '_mean_price']
merged_train = X_cat_train.reset_index().merge(
hood_price, how='left',
on=[c]).set_index('index')[c + '_mean_price']
X_train = pd.concat((X_train, merged_train), axis=1)
merged_test = X_cat_test.reset_index().merge(
hood_price, how='left', on=[
c
]).set_index('index')[c +
'_mean_price'].fillna(sale_price_mean)
X_test = pd.concat((X_test, merged_test), axis=1)
y_train = np.log(y_train)
y_test = np.log(y_test)
split = (X_train, y_train, X_test, y_test)
dtr = DTR(criterion='mse', max_depth=None)
ada = ensemble.AdaBoostRegressor(base_estimator=dtr,
n_estimators=100,
learning_rate=1.0,
loss='exponential')
score = get_score(ada, split)
ada_scores.append(score)
ridge = linear_model.Ridge(250)
score = get_score(ridge, split)
ridge_scores.append(score)
gbr = ensemble.GradientBoostingRegressor(n_estimators=100,
learning_rate=0.1,
max_depth=5)
score = get_score(gbr, split)
gbr_scores.append(score)
linear = linear_model.LinearRegression()
score = get_score(linear, split)
linear_scores.append(score)
# is bad:
# knn = KNR(n_neighbors=10)
# score = get_score(knn, split)
# knn_scores.append(score)
# print(dict(zip(X_train.columns, model.feature_importances_)))
# print(X_train.columns[np.argpartition(model.feature_importances_, -4)[-4:]])
# print(model.feature_importances_[np.argpartition(model.feature_importances_, -4)[-4:]])
# print(model.feature_importances_)
k += 1
scores = [ada_scores, ridge_scores, gbr_scores, linear_scores, knn_scores]
return scores, k