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h2_fit_neural.py
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h2_fit_neural.py
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# -*- coding: utf-8 -*-
"""
Created on Sat Feb 11 11:24:58 2017
@author: Samuli
"""
from keras.models import Sequential
from keras.layers import Dense, Dropout, Activation, Input, merge, Lambda
from keras.models import Model
from keras.optimizers import SGD
import numpy as np
from keras.wrappers.scikit_learn import KerasClassifier
from keras.utils import np_utils
from sklearn.model_selection import cross_val_score
from sklearn.model_selection import KFold
from keras.regularizers import l2, activity_l2
from sklearn.metrics import classification_report
from sklearn.metrics import accuracy_score
import confusion_matrix as cm
import roc
print('Loading normalized data from HDF5...')
import h5py
h5f = h5py.File('datasets.h5', 'r')
X_train = h5f['X_nn_train'].value
Y_train = h5f['Y_nn_train'].value.astype(np.float32)
X_test = h5f['X_nn_test'].value
Y_test = h5f['Y_nn_test'].value.astype(np.float32)
X_train2 = h5f['X_rf_train'].value
Y_train2 = h5f['Y_rf_train'].value.astype(np.float32)
X_test2 = h5f['X_rf_test'].value
Y_test2 = h5f['Y_rf_test'].value.astype(np.float32)
h5f.close()
from sklearn.ensemble import ExtraTreesClassifier
print('Training ExtraTreesClassifier for "attack or not" labels...')
model2 = ExtraTreesClassifier(n_estimators=31, criterion='entropy')
model2 = model2.fit(X_train2, Y_train2)
Y_pred2 = model2.predict_proba(X_test2)[:,1]
print('Testing accuracy...')
score2 = accuracy_score(Y_test2, np.around(Y_pred2))
print(score2)
print(classification_report(Y_test2, np.around(Y_pred2)))
def perf_measure(y_actual, y_hat):
TP = 0
FP = 0
TN = 0
FN = 0
for i in range(len(y_hat)):
if y_actual[i]==y_hat[i]==1:
TP += 1
for i in range(len(y_hat)):
if y_hat[i]==1 and y_actual[i]!=y_hat[i]:
FP += 1
for i in range(len(y_hat)):
if y_actual[i]==y_hat[i]==0:
TN += 1
for i in range(len(y_hat)):
if y_hat[i]==0 and y_actual[i]!=y_hat[i]:
FN += 1
return(TP, FP, TN, FN)
TP, FP, TN, FN = perf_measure(np.around(Y_pred2), Y_test2)
fp_rate = FP/(TN+FP)
tn_rate = TN/(TN+FP)
accuracy = (TN+TP)/(TN+FP+TP+TN)
precision = TP/(TN+FP)
hitrate = TP/(TN+FN)
print('TP:', TP, 'FP:', FP, 'TN:', TN, 'FN:', FN)
print('Accuracy:', accuracy)
print('False Positive rate:', fp_rate, 'True Negative Rate', tn_rate)
def to_cat(y):
y_tmp = np.ndarray(shape=(y.shape[0], 2), dtype=np.float32)
for i in range(y.shape[0]):
y_tmp[i, :] = np.array([1-y[i], y[i]]) # np.array([0,1]) if y[i] else np.array([1,0])
return y_tmp
cm.plot_confusion_matrix(Y_test2, np.round(Y_pred2), classes=list(range(2)),
normalize=True,
title='"Attack or not" confusion matrix')
roc.plot_roc_curve(to_cat(Y_test2), to_cat(Y_pred2), 2, 0, title='Receiver operating characteristic (attack_or_not = 0)')
roc.plot_roc_curve(to_cat(Y_test2), to_cat(Y_pred2), 2, 1, title='Receiver operating characteristic (attack_or_not = 1)')
print('Combining predicted "attack or not" labels to neural network testing data...')
X_test = np.concatenate((Y_pred2[:,np.newaxis], X_test), axis=1)
print('Creating neural network...')
num_of_features = X_train.shape[1]
nb_classes = Y_train.shape[1]
def residual_layer(size, x):
y = Dense(size, activation='sigmoid', W_regularizer=l2(0.01), activity_regularizer=activity_l2(0.01))(x)
# x = Dropout(0.5)(x)
# print(x.get_shape().as_list()[1])
y = Dense(x.get_shape().as_list()[1], activation='sigmoid', W_regularizer=l2(0.01), activity_regularizer=activity_l2(0.01))(y)
res = merge([y, x], mode='sum')
return res
def baseline_model():
def branch2(x):
x = Dense(np.floor(num_of_features*50), activation='sigmoid')(x)
x = Dropout(0.75)(x)
x = Dense(np.floor(num_of_features*20), activation='sigmoid')(x)
x = Dropout(0.5)(x)
x = Dense(np.floor(num_of_features), activation='sigmoid')(x)
x = Dropout(0.1)(x)
return x
main_input = Input(shape=(num_of_features,), name='main_input')
x = main_input
x = branch2(x)
main_output = Dense(nb_classes, activation='softmax')(x)
model = Model(input=main_input, output=main_output)
model.compile(loss='categorical_crossentropy', optimizer='adam', metrics=['accuracy', 'categorical_crossentropy'])
return model
model = baseline_model()
print('Training neural network...')
history = model.fit(X_train, Y_train,
nb_epoch=100,
batch_size=128
)
print('Plotting training history data...')
print(history.history.keys())
from epoch_history_plot import plot_hist
plot_hist(history, ['loss', 'acc'])
# summarize history for accuracy
import matplotlib.pyplot as plt
plt.figure()
plt.plot(history.history['acc'])
# plt.plot(history.history['val_acc'])
plt.title('model accuracy')
plt.ylabel('accuracy')
plt.xlabel('epoch')
#plt.legend(['train', 'test'], loc='upper left')
plt.show()
plt.figure()
# 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')
#plt.legend(['train', 'test'], loc='upper left')
plt.show()
print('Testing neural network...')
Y_predicted = model.predict(X_test)
max_probs = np.argmax(Y_predicted, axis=1)
Y_pred = np.zeros(Y_predicted.shape)
for row, col in enumerate(max_probs):
Y_pred[row,col] = 1
score = accuracy_score(Y_test, Y_pred)
print(score)
print(classification_report(Y_test.argmax(axis=-1), Y_pred.argmax(axis=-1)))
cm.plot_confusion_matrix(Y_test.argmax(axis=-1), Y_pred.argmax(axis=-1), classes=list(range(10)),
normalize=True,
title='Confusion matrix')
print('Saving neural network model...')
json_string = model.to_json()
with open('neural_model1.json', 'w') as f:
f.write(json_string)
model.save_weights('neural_model_weights1.h5')
model.save('neural_model1.h5')
roc.plot_roc_curve(Y_test, Y_predicted, nb_classes, 6, title='Receiver operating characteristic (class 6)')
roc.plot_roc_curve(Y_test, Y_predicted, nb_classes, 4, title='Receiver operating characteristic (class 4)')
roc.plot_roc_curve(Y_test, Y_predicted, nb_classes, 2, title='Receiver operating characteristic (class 2)')
roc.plot_roc_curve(Y_test, Y_predicted, nb_classes, 0, title='Receiver operating characteristic (class 0)')
model3 = ExtraTreesClassifier(n_estimators=5, criterion='entropy')
print('Fitting...')
model3 = model2.fit(X_train, Y_train.argmax(axis=-1))
print('Predicting...')
Y_predicted3 = model3.predict(X_test)
print('Testing accuracy...')
score3 = accuracy_score(Y_test.argmax(axis=-1), Y_predicted3)
print(score3)
print(classification_report(Y_test.argmax(axis=-1), Y_predicted3))
cm.plot_confusion_matrix(Y_test.argmax(axis=-1), Y_predicted3, classes=list(range(10)),
normalize=True,
title='Extratrees Confusion matrix')
'''
print('Saving X and Y to HDF5')
h5f = h5py.File('results.h5', 'w')
h5f.create_dataset('Y_predicted', data=Y_pred)
h5f.create_dataset('Y_expected', data=Y_test)
h5f.close()
'''