def find_optimal_n_components_plsr(x_train, y_train, max_n_components, num_folds_cv):
# Store the average mse of different n_components
list_ave_mse = []
for n_components in range(1, max_n_components + 1):
# Store the mse of the current n_components in cv
list_mse = []
# Define the function of compute mse in the training and testing data
def compute_mse(x_train, y_train, x_test, y_test):
model = PLSRegression(n_components=n_components).fit(x_train, y_train)
predictions = model.predict(x_test)
mse = optunity.metrics.mse(y_test, predictions)
list_mse.append(mse)
return mse
# The cv object
cv = optunity.cross_validated(x=x_train, y=y_train, num_folds=num_folds_cv)
try:
compute_mse_cv = cv(compute_mse)
compute_mse_cv()
except ValueError:
print('Value error. The n_component in PLSR is bigger than the dimension of the input data!')
print('Found the optimal n_component in the valid range.')
break
# Record the ave_mes for this parameter
ave_mse = np.mean(list_mse)
list_ave_mse.append(ave_mse)
# Find the min and index of list_ave_mse
optimal_n_components = np.argmin(list_ave_mse) + 1
print("The optimal number of components of PLS: ", optimal_n_components)
return optimal_n_components
def __init__(self, images, labels, n_folds_cv):
self.__space_ = {'kernel': {'linear': {'C': [0, 2]},
'rbf': {'logGamma': [-5, 0], 'C': [0, 10]},
'poly': {'degree': [2, 5], 'C': [0, 5], 'coef0': [0, 2]}
}
}
self.__sgd_space_ = {'alpha1': [0.0001, 5], 'power_t':[0.1,0.9]}
self.__log = log.Logger()
self.__cv_decorator_ = optunity.cross_validated(x=images, y=labels, num_folds=n_folds_cv)
def run_optunity(self):
cv_decorator = optunity.cross_validated(
x=self.X,
y=self.Y,
)
svm_tuned_auroc = cv_decorator(self.svm_tuned_auroc)
optimal_svm_pars, info, _ = optunity.maximize_structured(
svm_tuned_auroc, self.space, num_evals=150, pmap=optunity.pmap)
print("Optimal parameters" + str(optimal_svm_pars))
print("AUROC of tuned SVM: %1.3f" % info.optimum)
df = optunity.call_log2dataframe(info.call_log)
print(df.sort_values('value', ascending=False))
def train(self):
self._pca.fit(self._features_data)
features_pca = self._pca.transform(self._features_data)
cv_decorator = optunity.cross_validated(x=features_pca,
y=self._labels,
num_folds=5)
svm_tuned = cv_decorator(svm_tuned_precision)
optimal_svm_pars, _, _ = optunity.maximize_structured(
svm_tuned,
_SVM_SEARCH_SPACE,
num_evals=self._config.get('num_evals', 100))
self._model = _train_model(features_pca, self._labels,
**optimal_svm_pars)
def prepare_svm(X, Y, prob_setting):
'''
Code inspired by http://optunity.readthedocs.org/en/latest/notebooks/notebooks/sklearn-svc.html#tune-svc-without-deciding-the-kernel-in-advance
'''
cv_decorator = optunity.cross_validated(x=X, y=Y, num_folds=10)
space = {'kernel': {'linear': {'C': [0, 1000], 'class_weight_param': [1, 22]},
'rbf': {'logGamma': [-5, 1], 'C': [0, 1000], 'class_weight_param': [1, 22]},
'poly': {'degree': [2, 5], 'C': [0, 1000], 'coef0': [0, 100],
'class_weight_param': [1, 22]}}}
def train_model(x_train, y_train, kernel, C, logGamma, degree, coef0, classWeightParam):
if kernel=='linear':
model = SVC(kernel=kernel, C=C, class_weight={1: classWeightParam})
elif kernel=='poly':
model = SVC(kernel=kernel, C=C, degree=degree, coef0=coef0, class_weight={1: classWeightParam})
elif kernel=='rbf':
model = SVC(kernel=kernel, C=C, gamma=10 ** logGamma, class_weight={1: classWeightParam})
else:
raise ValueError("Unknown kernel function: %s" % kernel)
model.fit(x_train, y_train)
return model
def svm_tuned_auroc(x_train, y_train, x_test, y_test, kernel='linear', C=0, logGamma=0, degree=0, coef0=0, class_weight_param=1):
model = train_model(x_train, y_train, kernel, C, logGamma, degree, coef0, class_weight_param)
decision_values = model.decision_function(x_test)
return optunity.metrics.roc_auc(y_test, decision_values)
svm_tuned_auroc = cv_decorator(svm_tuned_auroc)
optimal_svm_pars, info, _ = optunity.maximize_structured(svm_tuned_auroc, space, num_evals=200)
print("Optimal parameters:"+str(optimal_svm_pars))
print("AUROC of tuned SVM: %1.3f" % info.optimum)
classifier = build_svc(optimal_svm_pars, prob_setting)
classifier.fit(X, Y)
return classifier
import math
import itertools
import optunity
import optunity.metrics
import sklearn.svm
from sklearn.datasets import load_diabetes
diabetes = load_diabetes()
n = diabetes.data.shape[0]
data = diabetes.data
targets = diabetes.target
# we explicitly generate the outer_cv decorator so we can use it twice
outer_cv = optunity.cross_validated(x=x1, y=y1, num_folds=3)
def compute_mse_standard(x_train, y_train, x_test, y_test):
"""Computes MSE of an SVR with RBF kernel and default hyperparameters.
"""
model = sklearn.svm.SVR().fit(x_train, y_train)
predictions = model.predict(x_test)
return optunity.metrics.mse(y_test, predictions)
# wrap with outer cross-validation
compute_mse_standard = outer_cv(compute_mse_standard)
compute_mse_standard()
######################################
regularization=[0.001, 0.05],
step=[0.01, 0.2])
predict, w, b = train_lr(x_train, y_train, **pars)
yhat = predict(x_test)
loss = optunity.metrics.logloss(y_test, yhat)
brier = optunity.metrics.brier(y_test, yhat)
print('+ model: ' + str(b.get_value())[:5] + ' + ' + str(w.get_value()[0])[:5] + ' * x1 + ' + str(w.get_value()[1])[:5] + ' * x2')
print('++ log loss in test fold: ' + str(loss))
print('++ Brier loss in test fold: ' + str(brier))
print('')
return loss, brier
# wrap both evaluation functions in cross-validation
# we will compute two metrics using nested cross-validation
# for this purpose we use list_mean() as aggregator
outer_cv = optunity.cross_validated(x=data, y=labels, num_folds=3,
aggregator=optunity.cross_validation.list_mean)
lr_untuned = outer_cv(lr_untuned)
lr_tuned = outer_cv(lr_tuned)
print('true model: 1 + 2 * x1 + 3 * x2')
print('')
# perform experiment
print('evaluating untuned LR model')
untuned_loss, untuned_brier = lr_untuned()
print('evaluating tuned LR model')
tuned_loss, tuned_brier = lr_tuned()
print('Log loss (lower is better):')
print('untuned: ' + str(untuned_loss))
def modelling_PLSRegression(max_n_components,
num_folds_outer_cv,
num_folds_inner_cv,
input_data_array,
wavelengths,
labels,
flag_save=False,
flag_fig=False,
id_cv=0):
"""
Modelling a PSL regression using cross-validation.
:param max_n_components:
:param num_folds_outer_cv:
:param num_folds_inner_cv:
:param input_data_array:
:param wavelengths: for the purpose of recored only
:param labels: the values need to be predicted
:param flag_save:
:param flag_fig:
:param id_cv: the id of cv to check
:return: the record of cv and the model trained using all of the data.
Author: Huajian Liu
Email: [email protected]
Version: v0 (10, Feb, 2019)
"""
start = datetime.datetime.now()
print('')
print('PLS regression')
print('The range of n_components is: [1, ' + str(max_n_components) + ']')
print('')
# For records
date_time = datetime.datetime.now().strftime('%y-%m-%d-%H-%M-%S')
save_record_name = 'record_plsr_' + date_time + '.sav'
save_model_name = 'model_plsr' + date_time + '.sav'
####################################################################################################################
# Outer CV function for computing mean square error compute_mse_pls()
####################################################################################################################
print('Conducting outer cross-validation')
# For record.
params_each_fold = []
errors_each_fold = []
predictions_labels_each_fold = []
tuned_models_each_fold = []
# Define the function for outer CV
def compute_mse_pls(x_train, y_train, x_test, y_test):
"""Find the optimized n_nomponents.
Train a model using the opt-parameter.
compute MSE
"""
# ##############################################################################################################
# # Find the optimal parameter (n_components) of PLS
# ##############################################################################################################
optimal_n_components = find_optimal_n_components_plsr(x_train, y_train, max_n_components=max_n_components,
num_folds_cv=num_folds_inner_cv)
################################################################################################################
# Train a model using the optimal parameters and the x_train and y_train
################################################################################################################
# Train
tuned_model = PLSRegression(n_components=optimal_n_components).fit(x_train, y_train)
# Predict the testing data and training data
predictions_train = tuned_model.predict(x_train)
predictions_train = predictions_train.reshape(x_train.shape[0], order='C') # Make it one-D
predictions_test = tuned_model.predict(x_test)
predictions_test = predictions_test.reshape(x_test.shape[0], order='C')
################################################################################################################
# Record errors and parameters
################################################################################################################
errors_train = errors_prediction(y_train, predictions_train)
errors_test = errors_prediction(y_test, predictions_test)
print('R^2_train: ', errors_train['r2_score'])
print('R^2_validation:', errors_test['r2_score'])
print('')
predictions_labels_each_fold.append({'predictions_train': predictions_train,
'labels_train': y_train,
'predictions_test': predictions_test,
'labels_test': y_test})
params_each_fold.append({'optimal_n_component': optimal_n_components})
errors_each_fold.append({'errors_train': errors_train, 'errors_test': errors_test})
tuned_models_each_fold.append(tuned_model)
return errors_test['mse']
# Activate outer CV
outer_cv = optunity.cross_validated(x=input_data_array, y=labels, num_folds=num_folds_outer_cv)
compute_mse_pls = outer_cv(compute_mse_pls)
compute_mse_pls()
print('The cross-validation has been done!', datetime.datetime.now().strftime('%y-%m-%d-%H-%M-%S'))
stop = datetime.datetime.now()
print('Total time used ', stop - start)
ave_errors = errors_average(errors_each_fold)
print_ave_errors_cv(ave_errors)
################################################################################################################
# Train a model using all of the data
################################################################################################################
print('')
print('Traing the finial model using all of the data')
optimal_n_components = find_optimal_n_components_plsr(input_data_array, labels, max_n_components=max_n_components,
num_folds_cv=num_folds_outer_cv)
# Train a model using the optimal parameters and the x_train and y_train
tuned_model_finial = PLSRegression(n_components=optimal_n_components).fit(input_data_array, labels)
print('')
####################################################################################################################
# Record the results
####################################################################################################################
record_pls = {'model_name': save_model_name,
'date_time': date_time,
'num_folds_outer_cv': num_folds_outer_cv,
'num_folds_inner_cv': num_folds_inner_cv,
'tuned_models_each_fold': tuned_models_each_fold,
'predictions_labels_each_fold': predictions_labels_each_fold,
'optimal_parameters_each_fold': params_each_fold,
'errors_each_fold': errors_each_fold,
'average_errors': ave_errors,
'wavelengths': wavelengths,
'input_data_array': input_data_array,
'tuned_model_finial': tuned_model_finial
}
if flag_fig:
# Plot a record in one (random selected) of the cv
plot_regression_result(predictions_labels_each_fold[id_cv]['labels_train'],
predictions_labels_each_fold[id_cv]['predictions_train'])
plot_regression_result(predictions_labels_each_fold[id_cv]['labels_test'],
predictions_labels_each_fold[id_cv]['predictions_test'])
####################################################################################################################
# Save record
####################################################################################################################
if flag_save:
joblib.dump(record_pls, save_record_name)
print('The the record has been saved in the current working folder.')
return record_pls
label[index] = file[index][0]
return label
#导入数据
f1 = np.loadtxt('D:/Study/Bioinformatics/AFP/feature_matrix/Antifp_Main/ASDC/train_ASDC.csv', delimiter = ',', skiprows = 1)
y_train = np.loadtxt('D:/Study/Bioinformatics/AFP/feature_matrix/Antifp_Main/train_label.csv', delimiter = ',')
sample = get_matrix(f1)
label = y_train
print(sample)
print(label)
#we will make the cross-validation decorator once, so we can reuse it later for the other tuning task
# by reusing the decorator, we get the same folds etc.
cv_decorator = optunity.cross_validated(x=sample, y=label, num_folds=5)
def svr_rforest_tuned_acc(x_train, y_train, x_test, y_test, n_estimators, max_depth,min_samples_leaf,
min_samples_split):
rf = RandomForestClassifier(n_estimators=int(n_estimators),max_features='log2',
max_depth=int(max_depth),min_samples_leaf=int(min_samples_leaf),
min_samples_split=int(min_samples_split), n_jobs=-1).fit(x_train,y_train)
y_pre = rf.predict(x_test)
#pcc = round(np.corrcoef(y_pre, y_test)[0][1], 5)
acc = optunity.metrics.accuracy(y_pre, y_test)
# auc = optunity.metrics.roc_auc(y_test, decision_values)
return acc
#auc = optunity.metrics.roc_auc(y_test, decision_values)
#print(pcc_test)
#return optunity.metrics.mse(y_test, y_pre)
negative_digit = 9
positive_idx = [i for i in range(n) if digits.target[i] == positive_digit]
negative_idx = [i for i in range(n) if digits.target[i] == negative_digit]
# add some noise to the data to make it a little challenging
original_data = digits.data[positive_idx + negative_idx, ...]
data = original_data + 5 * numpy.random.randn(original_data.shape[0], original_data.shape[1])
labels = [True] * len(positive_idx) + [False] * len(negative_idx)
# we will use nested 3-fold cross-validation
# in the outer cross-validation procedure
# we make the decorator explicitly so we can reuse the same folds
# in both tuned and untuned approaches
folds = optunity.cross_validation.generate_folds(data.shape[0], num_folds=3)
outer_cv = optunity.cross_validated(x=data, y=labels, num_folds=3, folds=[folds],
aggregator=optunity.cross_validation.identity)
outer_cv = optunity.cross_validated(x=data, y=labels, num_folds=3)
# compute area under ROC curve of default parameters
def compute_roc_standard(x_train, y_train, x_test, y_test):
model = sklearn.svm.SVC().fit(x_train, y_train)
decision_values = model.decision_function(x_test)
auc = optunity.metrics.roc_auc(y_test, decision_values)
return auc
# decorate with cross-validation
compute_roc_standard = outer_cv(compute_roc_standard)
roc_standard = compute_roc_standard()
#print('Nested cv area under ROC curve of non-tuned model: ' + str(roc_standard))
# compute area under ROC curve with tuned parameters
scaler = StandardScaler()
data = X
data = scaler.fit_transform(data)
labels = y
space = {
'kernel': {
'rbf': {
'logGamma': [-5, 0],
'C': [0, 10]
},
}
}
cv_decorator = optunity.cross_validated(x=data, y=labels, num_folds=5)
def train_model(x_train, y_train, kernel, C, logGamma, degree, coef0):
"""A generic SVM training function, with arguments based on the chosen kernel."""
if kernel == 'linear':
model = svm.SVC(kernel=kernel, C=C, cache_size=10000, verbose=3)
elif kernel == 'poly':
model = svm.SVC(kernel=kernel,
C=C,
degree=degree,
coef0=coef0,
cache_size=10000,
verbose=3)
elif kernel == 'rbf':
model = svm.SVC(kernel=kernel,
return optunity.metrics.logloss(y_test, yhat)
pars, _, _ = optunity.minimize(inner_cv,
num_evals=50,
regularization=[0.001, 0.05],
step=[0.01, 0.2])
predict, w, b = train_lr(x_train, y_train, **pars)
yhat = predict(x_test)
loss = optunity.metrics.logloss(y_test, yhat)
brier = optunity.metrics.brier(y_test, yhat)
return loss, brier
# wrap both evaluation functions in cross-validation
# we will compute two metrics using nested cross-validation
# for this purpose we use list_mean() as aggregator
outer_cv = optunity.cross_validated(
x=train,
y=labels,
num_folds=3,
aggregator=optunity.cross_validation.list_mean)
lr_untuned = outer_cv(lr_untuned)
lr_tuned = outer_cv(lr_tuned)
print('true model: 1 + 2 * x1 + 3 * x2')
print('')
# perform experiment
print('evaluating untuned LR model')
untuned_loss, untuned_brier = lr_untuned()
negative_digit = 9
positive_idx = [i for i in range(n) if digits.target[i] == positive_digit]
negative_idx = [i for i in range(n) if digits.target[i] == negative_digit]
# add some noise to the data to make it a little challenging
original_data = digits.data[positive_idx + negative_idx, ...]
data = original_data + 5 * numpy.random.randn(original_data.shape[0], original_data.shape[1])
labels = [True] * len(positive_idx) + [False] * len(negative_idx)
# we will use nested 3-fold cross-validation
# in the outer cross-validation procedure
# we make the decorator explicitly so we can reuse the same folds
# in both tuned and untuned approaches
folds = optunity.cross_validation.generate_folds(data.shape[0], num_folds=3)
outer_cv = optunity.cross_validated(x=data, y=labels, num_folds=3, folds=[folds],
aggregator=optunity.cross_validation.identity)
outer_cv = optunity.cross_validated(x=data, y=labels, num_folds=3)
# compute area under ROC curve of default parameters
def compute_roc_standard(x_train, y_train, x_test, y_test):
model = sklearn.svm.SVC().fit(x_train, y_train)
decision_values = model.decision_function(x_test)
auc = optunity.metrics.roc_auc(y_test, decision_values)
return auc
# decorate with cross-validation
compute_roc_standard = outer_cv(compute_roc_standard)
roc_standard = compute_roc_standard()
print('Nested cv area under ROC curve of non-tuned model: ' + str(roc_standard))
# Data
direc = '../data/'
file = direc + 'housing.csv'
df = pd.read_csv(file, delim_whitespace=True, header=None)
# split into X and y
X = df.iloc[:, 0:13].as_matrix()
y = df.iloc[:, 13].as_matrix()
num = X.shape[1]
x_train, x_test, y_train, y_test = train_test_split(X,
y,
test_size=0.1,
random_state=0)
# SVC
outer_cv = optunity.cross_validated(x=x_train, y=y_train, num_folds=3)
space = {
'kernel': {
'linear': {
'C': [0, 100]
},
'rbf': {
'gamma': [0, 50],
'C': [1, 100]
},
'poly': {
'degree': [2, 5],
'C': [1000, 20000],
'coef0': [0, 1]
}
}
def modelling_svr_rbf(C_svr_rbf,
gamma_svr_rbf,
wavelengths_range,
input_type,
num_folds_outer_cv,
num_iter_inner_cv,
num_folds_inner_cv,
num_evals_inner_cv,
samples,
wavelengths,
labels,
flag_save,
flag_fig):
""" Model a svr with rbf kernel."""
start = datetime.datetime.now()
print('')
print('svr (kernel = rbf)')
print('The range of C is: ', C_svr_rbf)
print('The range of gamma is: ', gamma_svr_rbf)
print('')
# For records
date_time = datetime.datetime.now().strftime('%y-%m-%d-%H-%M-%S')
model_name = 'svr_rbf'
save_record_name = 'record' + '_' + wavelengths_range + '_' + input_type + '_' + model_name + '.sav'
save_model_name = 'model' + '_' + wavelengths_range + '_' + input_type + '_' + model_name + '.sav'
# //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
# CV
# ///
print('Conducting cross-validation')
# For record
params_each_fold = []
errors_each_fold = []
predictions_labels_each_fold = []
tuned_models_each_fold = []
# ==================================================================================================================
# Thf function for outer_cv
# ==========================
def compute_mse_svr_rbf(x_train, y_train, x_test, y_test):
"""Find the optimal hyperparameters of svm;
Train a model using the optmal parametes
compute MSE
"""
# -------------------------------------------------------------------------------------------------------------
# Find optimal parameters
# ------------------------
@optunity.cross_validated(x=x_train, y=y_train, num_iter=num_iter_inner_cv,
num_folds=num_folds_inner_cv)
def tune_cv(x_train, y_train, x_test, y_test, C, gamma):
model = SVR(C=C, gamma=gamma).fit(x_train, y_train)
predictions = model.predict(x_test)
return optunity.metrics.mse(y_test, predictions)
# Optimise parameters
optimal_pars, _, _ = optunity.minimize(tune_cv, num_evals=num_evals_inner_cv, C=C_svr_rbf, gamma=gamma_svr_rbf)
print("THe optimal hyperparameters of SVR (kernel = rbf): " + str(optimal_pars))
# -----------------------
# Find optimal parameters
# -------------------------------------------------------------------------------------------------------------
# Train a model using the optimal parameters and the x_train and y_train
tuned_model = SVR(**optimal_pars).fit(x_train, y_train)
# Predict the testing data and training data
predictions_train = tuned_model.predict(x_train)
predictions_train = predictions_train.reshape(x_train.shape[0], order='C') # Make it one-D
predictions_test = tuned_model.predict(x_test)
predictions_test = predictions_test.reshape(x_test.shape[0], order='C')
# Errors
errors_train = errors_prediction(y_train, predictions_train)
errors_test = errors_prediction(y_test, predictions_test)
print('R^2_train: ', errors_train['r2_score'])
print('R^2_test:', errors_test['r2_score'])
# Save the parameters and errors
predictions_labels_each_fold.append({'predictions_train': predictions_train,
'labels_train': y_train,
'predictions_test': predictions_test,
'labels_test': y_test})
params_each_fold.append(optimal_pars)
errors_each_fold.append({'errors_train': errors_train, 'errors_test': errors_test})
tuned_models_each_fold.append(tuned_model)
return errors_test['mse']
# =========================
# The function for outer cv
# ==================================================================================================================
# The fellow is the same as:
# @optunity.cross_validated(x=samples, y=labels, num_folds=num_folds_outer_cv)
# def compute_mse_svr_rbf:
# ...
#
# compute_mse_svr_rbf()
outer_cv = optunity.cross_validated(x=samples, y=labels, num_folds=num_folds_outer_cv) # function decoter
compute_mse_svr_rbf = outer_cv(compute_mse_svr_rbf) # Decorate computer_mse_svr_rbf
compute_mse_svr_rbf()
print('The cross-validation has been done!', datetime.datetime.now().strftime('%y-%m-%d-%H-%M-%S'))
stop = datetime.datetime.now()
print('Total time used ', stop - start)
# ///
# CV
# //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
# Record the results
ave_errors = errors_average(errors_each_fold)
record_svr_rbf = {'model_name': save_model_name,
'date_time': date_time,
'C_range': C_svr_rbf,
'gamma_range': gamma_svr_rbf,
'num_folds_outer_cv': num_folds_outer_cv,
'num_iter_inner_cv': num_iter_inner_cv,
'num_folds_inner_cv': num_folds_inner_cv,
'num_evals_inner_cv': num_evals_inner_cv,
'tuned_models_each_fold': tuned_models_each_fold,
'predictions_labels_each_fold': predictions_labels_each_fold,
'optimal_parameters_each_fold': params_each_fold,
'errors_each_fold': errors_each_fold,
'average_errors': ave_errors,
'wavelengths': wavelengths
}
# Print average of cv
print_ave_errors_cv(ave_errors)
if flag_fig:
# Plot a record in one (random selected) of the cv
plot_regression_result(predictions_labels_each_fold[0]['labels_train'],
predictions_labels_each_fold[0]['predictions_train'])
plot_regression_result(predictions_labels_each_fold[0]['labels_test'],
predictions_labels_each_fold[0]['predictions_test'])
# //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
# Train a model using all of the data
# ////////////////////////////////////
# ==================================================================================================================
# Find the optimal parameters
# ============================
print('Training a SVR (kernel = rbf) instance.')
@optunity.cross_validated(x=samples, y=labels, num_iter=num_iter_inner_cv,
num_folds=num_folds_inner_cv)
def tune_cv(x_train, y_train, x_test, y_test, C, gamma):
model = SVR(C=C, gamma=gamma).fit(x_train, y_train)
predictions = model.predict(x_test)
return optunity.metrics.mse(y_test, predictions)
# Optimise parameters
optimal_pars, _, _ = optunity.minimize(tune_cv, num_evals=num_evals_inner_cv, C=C_svr_rbf, gamma=gamma_svr_rbf)
# ============================
# Find the optimal parameters
# ==================================================================================================================
# Train a model using all of the data
tuned_model_finial = SVR(**optimal_pars).fit(samples, labels)
# ///////////////////////////////////
# Train a model using all of the data
# //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
# Save the model
if flag_save:
joblib.dump(record_svr_rbf, save_record_name)
joblib.dump(tuned_model_finial, save_model_name)
print('The tuned_model_finial and the record has been saved!')
return record_svr_rbf, tuned_model_finial
# SVM regression with rbf kernel
################################
# SVM regression with rbf kernel
########################################################################################################################
def train(self, file, tuning, cache, save, svr, ignore):
if svr:
self.svr = True
print("== SVR mode ==")
else:
self.svr = False
if tuning:
self.tuning = int(tuning)
else:
self.tuning = 0
self.file = file
if cache:
self.cache = cache
else:
self.cache = 0
self.datas = json.load(self.file)
if ignore and ignore > 0:
class_0 = 0
class_1 = 0
class_2 = 0
self.ignore = ignore
counter = list()
for i in range(0, len(self.datas)):
if self.datas[i]['score2'] > 300:
counter.append(i)
continue
if self.ignore > 1 and self.datas[i]['followers_count'] > 10000:
counter.append(i)
continue
if self.ignore > 2 and self.datas[i]['score'] > 20000:
counter.append(i)
continue
if self.ignore > 3:
if self.datas[i]['score2'] >= 200:
if class_2 > 30000:
counter.append(i)
continue
else:
class_2 += 1
elif self.datas[i]['score2'] >= 50:
if class_1 > 30000:
counter.append(i)
continue
else:
class_1 += 1
elif self.datas[i]['score2'] >= 0:
if class_0 > 30000:
counter.append(i)
continue
else:
class_0 += 1
self.datas = [self.datas[i] for i in range(0, len(self.datas)) if i not in counter]
print(str(len(counter))+" aberrant values removed")
else:
self.ignore = 0
# Split data
self.train, self.test = train_test_split(self.datas, test_size=0.33, shuffle=True, random_state=42)
# Format data
if self.svr:
self.test_y, self.train_y = [row['score'] for row in self.test], [row['score'] for row in self.train]
else:
self.test_y, self.train_y = [[row['score'], row['score2']] for row in self.test], [[row['score'], row['score2']] for row in self.train]
self.test_X, self.train_X = [[row['hashtag'], row['weekday'], row['hour'], row['followers_count'], row['friends_count'], row['listed_count'], row['statuses_count'], row['text'], 0, 0, 0, 0, 0, 0, 0, 0, 0] for row in self.test], [[row['hashtag'], row['weekday'], row['hour'], row['followers_count'], row['friends_count'], row['listed_count'], row['statuses_count'], row['text'], 0, 0, 0, 0, 0, 0, 0, 0, 0] for row in self.train]
self.names = ['hashtag', 'weekday', 'hour', 'followers_count', 'friends_count', 'listed_count', 'statuses_count', 'text', 'quote', 'link', '...', '!', '?', '@', 'upper', 'polarity', 'subjectivity' ]
# Prepare features
self.prepare_columns()
# baselines
self.cache_baseline()
# Normalize dataset
print("Prepare dataset...")
self.cache_dataset()
if self.tuning == 1:
print("Tuning model")
if self.svr:
outer_cv = optunity.cross_validated(x=self.train_X, y=self.train_y, num_folds=3)
def compute_mse_rbf_tuned(x_train, y_train, x_test, y_test):
"""Computes MSE of an SVR with RBF kernel and optimized hyperparameters."""
# define objective function for tuning
@optunity.cross_validated(x=x_train, y=y_train, num_iter=2, num_folds=5)
def tune_cv(x_train, y_train, x_test, y_test, C, gamma):
print("tune_cv model C="+str(C)+", gamma="+str(gamma))
model = SVR(C=C, gamma=gamma).fit(x_train, y_train)
print("tune_cv model fit")
predictions = model.predict(x_test)
return optunity.metrics.mse(y_test, predictions)
# optimize parameters
optimal_pars, _, _ = optunity.minimize(tune_cv, 150, C=[1, 100], gamma=[0, 50])
print("optimal hyperparameters: " + str(optimal_pars))
tuned_model = SVR(**optimal_pars).fit(x_train, y_train)
predictions = tuned_model.predict(x_test)
return optunity.metrics.mse(y_test, predictions)
# wrap with outer cross-validation
compute_mse_rbf_tuned = outer_cv(compute_mse_rbf_tuned)
compute_mse_rbf_tuned()
else:
sample_leaf_options = [1,5,10,50,100,200,500]
for leaf_size in sample_leaf_options :
print(":: leaf_size = " + str(leaf_size))
self.min_samples_leaf = leaf_size
self.cache_model()
print("Predict model")
self.predictions = self.regr_rf.predict(self.test_X)
print("Feature importance : ")
print(sorted(zip(map(lambda x: round(x, 4), self.regr_rf.feature_importances_), self.names), reverse=True))
self.test_score_rf = mean_squared_error(self.test_y, self.predictions)
print('=Model Test MSE: %.3f' % self.test_score_rf)
self.test_score = self.test_score_rf
self.evaluation()
elif self.tuning == 2:
print("Tuning model 2")
param_grid = { \
'bootstrap': [True, False],\
'max_depth': [80, 90, 100, 110],\
'max_features': [2, 3],\
'min_samples_leaf': [1, 3, 4, 5, 500],\
'min_samples_split': [8, 10, 12],\
'n_estimators': [100, 200, 300, 1000]\
}
rf = RandomForestRegressor()
# Instantiate the grid search model
grid_search = GridSearchCV(estimator = rf, param_grid = param_grid, cv = 3, n_jobs = -1, verbose = 2)
grid_search.fit(self.train_X, self.train_y)
print("grid_search.best_params_=")
print(grid_search.best_params_)
else:
print("Train model")
self.cache_model()
if save:
print("Save model")
self.save_model()
print("Predict model")
self.predictions = self.regr_rf.predict(self.test_X)
if not self.svr:
print("Feature importance : ")
print(sorted(zip(map(lambda x: round(x, 4), self.regr_rf.feature_importances_), self.names), reverse=True))
self.test_score_rf = mean_squared_error(self.test_y, self.predictions)
print('=Model Test MSE: %.3f' % self.test_score_rf)
self.test_score = self.test_score_rf
print('r2 = ')
print(r2_score(self.test_y, self.predictions, multioutput='raw_values'))
classif = list()
classif_pred = list()
for i in range(0, len(self.test_y)):
if self.test_y[i][1] >= 200:
classif.append(2)
elif self.test_y[i][1] >= 50:
classif.append(1)
elif self.test_y[i][1] >= 0:
classif.append(0)
for i in range(0, len(self.predictions)):
if self.predictions[i][1] >= 200:
classif_pred.append(2)
elif self.predictions[i][1] >= 50:
classif_pred.append(1)
elif self.predictions[i][1] >= 0:
classif_pred.append(0)
target_names = ['class 0', 'class 1', 'class 2']
print(classification_report(classif, classif_pred, target_names=target_names))
x = np.asarray(self.test_y)[:,0]
y = np.asarray(self.predictions)[:,0]
max = [np.amax(x), np.amax(y)]
x1 = [0, np.amax(max)]
plt.figure()
plt.plot(x, y, 'r+')
plt.plot(x1, x1)
plt.figure()
x = np.asarray(self.test_y)[:,1]
y = np.asarray(self.predictions)[:,1]
max = [np.amax(x), np.amax(y)]
x1 = [0, np.amax(max)]
plt.plot(x, y, 'g+')
plt.plot(x1, x1)
plt.show()
self.evaluation()
def dead_single_opt(pmts, pmts_check, events):
N = int(len(events) / 5)
Events = [[event[j] for event in events if event[pmts[-1]] > 50][0:N]
for j in pmts]
logging.info('Number of Events Trained: ' + str(len(Events[0])))
logging.info('PMT Used to Train: ' + str(pmts[-1]))
data_train = list(zip(*Events[0:-1]))
target_train = Events[-1]
print('Normalizing Data')
scaler = preprocessing.StandardScaler().fit(data_train)
data_train = scaler.transform(data_train)
# we explicitly generate the outer_cv decorator so we can use it twice
outer_cv = optunity.cross_validated(x=data_train,
y=target_train,
num_folds=2)
mse_old = 10e7
def compute_mse_rbf_tuned(x_train, y_train, x_test, y_test):
"""Computes MSE of an SVR with RBF kernel and optimized hyperparameters."""
global optimal_parameters, clf
# define objective function for tuning
@optunity.cross_validated(x=x_train,
y=y_train,
num_iter=2,
num_folds=2)
def tune_cv(x_train, y_train, x_test, y_test, C, gamma):
# sample_weights = my_scaling_odr(y_train)
# sample_weights = [i / max(Events[-1]) for i in Events[-1]]
model = svm.SVR(C=C, gamma=gamma).fit(
x_train, y_train) #, sample_weight=sample_weights
predictions = model.predict(x_test)
return optunity.metrics.mse(y_test, predictions)
# optimize parameters
optimal_pars, _, _ = optunity.minimize(tune_cv,
200,
C=[1, 4000],
gamma=[0, 10],
pmap=optunity.pmap)
logging.info("Optimal hyperparameters: " + str(optimal_pars))
# sample_weights = my_scaling_odr(y_train)
tuned_model = svm.SVR(**optimal_pars).fit(x_train, y_train)
predictions = tuned_model.predict(x_test)
mse = optunity.metrics.mse(y_test, predictions)
logging.info('mse: ' + str(mse))
if mse < mse_old:
optimal_parameters = optimal_pars
clf = tuned_model
return mse
# wrap with outer cross-validation
compute_mse_rbf_tuned = outer_cv(compute_mse_rbf_tuned)
print('Beginning Cross-Validated Optimization of HyperParameters')
compute_mse_rbf_tuned()
Events_check = [[
event[j] for event in events if event[pmts_check[-1]] > 50
] for j in pmts_check]
logging.info('Number of Events Trained: ' + str(len(Events_check[0])))
logging.info('PMT Used to Train Final Function: ' + str(pmts_check[-1]))
X_Span = list(zip(*Events_check[:-1]))
X_Span = scaler.transform(X_Span)
print('Predicting Data Now')
pmt_estimate = clf.predict(X_Span)
# print('Plotting Guessed Data Now')
diff = [(pmt_estimate[i] - Events_check[-1][i]) / (Events_check[-1][i] + 1)
for i in range(0, len(Events_check[-1]))]
# print(np.mean(diff), np.std(diff))
# print(np.mean(np.abs(diff)), np.std(np.abs(diff)))
logging.critical('Final Average Absolute Relative Error: ' +
str(round(np.mean(np.abs(diff)), 3)) + '+-' +
str(round(np.std(np.abs(diff)), 3)))
# plt.figure()
# plt.plot(Events_check[-1], pmt_estimate, '*')
# plt.plot([0, max(Events_check[-1])], [0, max(Events_check[-1])], 'r', label='Error = 0%')
# plt.xlabel('Actual PMT Value')
# plt.ylabel('Estimated PMT Value')
# plt.show()
return clf, scaler
x_train, x_test, y_train, y_test = train_test_split(X,
y,
test_size=0.3,
random_state=5)
x_train = x_train.values
x_test = x_test.values
y_train = y_train.values
y_test = y_test.values
import optunity
import optunity.metrics
from sklearn.svm import SVR
from sklearn.pipeline import Pipeline
from sklearn import preprocessing
outer_cv = optunity.cross_validated(x=X, y=y, num_folds=3)
def compute_mse_rbf_tuned(x_train, y_train, x_test, y_test):
"""Computes MSE of an SVR with RBF kernel and optimized hyperparameters."""
# define objective function for tuning
@optunity.cross_validated(x=x_train, y=y_train, num_iter=2, num_folds=5)
def tune_cv(x_train, y_train, x_test, y_test, C, gamma, epsilon):
pipe = Pipeline([('scaler', preprocessing.StandardScaler()),
('svr', SVR(C=C, gamma=gamma, epsilon=epsilon))])
model = pipe.fit(x_train, y_train)
predictions = model.predict(x_test)
return optunity.metrics.mse(y_test, predictions)
# optimize parameters
box_constraints = {
"learning_rate": [-7, -3],
"num_nodes": [2, 20],
"num_layers": [1, 4],
"lr_decay": [0.0, 0.001],
"momentum": [0.8, 0.95],
"L1_reg": [0.05, 5.0],
"L2_reg": [0.05, 5.0],
"dropout": [0.0, 0.5]
}
opt_fxn = get_objective_function(100, update_fn=update_fn)
train = filter_train_by_visit(visit_type, data['train'])
opt_fxn = optunity.cross_validated(x=train[cols].values,
y=np.column_stack(
(train.is_diab.values,
train[time_col_train].values)),
num_folds=num_folds)(opt_fxn)
opt_params, call_log, _ = optunity.maximize(opt_fxn,
num_evals=50,
solver_name='sobol',
**box_constraints)
hyperparams = opt_params
hyperparams['hidden_layers_sizes'] = [int(hyperparams['num_nodes'])] * int(
hyperparams['num_layers'])
del hyperparams['num_layers']
del hyperparams['num_nodes']
hyperparams['batch_norm'] = True
hyperparams['standardize'] = True
hyperparams['learning_rate'] = 10**hyperparams['learning_rate']
degree=degree,
coef0=coef0,
class_weight='balanced')
elif kernel == 'rbf':
model = SVC(kernel=kernel,
C=C,
gamma=10**logGamma,
class_weight='balanced')
else:
raise ArgumentError("Unknown kernel function: %s" % kernel)
model.fit(x_train, y_train)
return model
cv_decorator = optunity.cross_validated(x=scaler.transform(
vec.transform(x_train).toarray()),
y=classes,
num_folds=3)
def svm_rbf_tuned_auroc(x_train, y_train, x_test, y_test, C, logGamma):
model = SVC(C=C, gamma=10**logGamma,
class_weight='balanced').fit(x_train, y_train)
decision_values = model.decision_function(x_test)
auc = optunity.metrics.roc_auc(y_test, decision_values)
return auc
def svm_tuned_auroc(x_train,
y_train,
x_test,
y_test,
y = np.stack((ya, yb), axis=1)
NUM_EPOCHS = num_epochs
NUM_FOLDS = num_folds
global main_logger
main_logger = load_logger(logdir)
#main_logger.debug('Parameters: ' + str(args))
box_constraints = load_box_constraints(box)
main_logger.debug('Box Constraints: ' + str(box_constraints))
opt_fxn = get_objective_function(NUM_EPOCHS, logdir,
utils.get_optimizer_from_str(update_fn))
opt_fxn = optunity.cross_validated(x=x,
y=y,
num_folds=NUM_FOLDS,
strata=strata)(opt_fxn)
main_logger.debug('Maximizing C-Index. Num_iterations: %d' % num_evals)
opt_params, call_log, _ = optunity.maximize(opt_fxn,
num_evals=num_evals,
solver_name='sobol',
**box_constraints)
main_logger.debug('Optimal Parameters: ' + str(opt_params))
main_logger.debug('Saving Call log...')
print(call_log._asdict())
save_call_log(
os.path.join(logdir, 'optunity_log_%s.pkl' % (str(uuid.uuid4()))),
call_log._asdict())
NUM_EPOCHS = args.num_epochs
NUM_FOLDS = args.num_folds
global main_logger
main_logger = load_logger(args.logdir)
main_logger.debug('Parameters: ' + str(args))
main_logger.debug('Loading dataset: ' + args.dataset)
x, y, strata = load_dataset(args.dataset)
box_constraints = load_box_constraints(args.box)
main_logger.debug('Box Constraints: ' + str(box_constraints))
opt_fxn = get_objective_function(NUM_EPOCHS, args.logdir,
utils.get_optimizer_from_str(args.update_fn))
opt_fxn = optunity.cross_validated(x=x, y=y, num_folds=NUM_FOLDS,
strata=strata)(opt_fxn)
main_logger.debug('Maximizing C-Index. Num_iterations: %d' % args.num_evals)
opt_params, call_log, _ = optunity.maximize(opt_fxn, num_evals=args.num_evals,
solver_name='sobol',
**box_constraints)
main_logger.debug('Optimal Parameters: ' + str(opt_params))
main_logger.debug('Saving Call log...')
print(call_log._asdict())
save_call_log(os.path.join(args.logdir, 'optunity_log_%s.pkl' % (str(uuid.uuid4()))), call_log._asdict())
exit(0)