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NeuralNetwork.py
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NeuralNetwork.py
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"""
Construct a NeuralNetwork class to include operations
related to various datasets and corresponding models.
Author: Min Wu
Email: [email protected]
"""
import cv2
import copy
import keras
from keras.datasets import mnist, cifar10
from keras.models import Sequential, load_model
from keras.layers import Dense, Dropout, Flatten, Conv2D, MaxPooling2D
from keras.preprocessing.image import ImageDataGenerator
from keras.preprocessing import image as Image
from keras import backend as K
from matplotlib import pyplot as plt
from basics import assure_path_exists
from DataSet import *
# Define a Neural Network class.
class NeuralNetwork:
# Specify which dataset at initialisation.
def __init__(self, data_set):
self.data_set = data_set
self.model = Sequential()
assure_path_exists("%s_pic/" % self.data_set)
def predict(self, image):
import numpy as np
image = np.expand_dims(image, axis=0)
predict_value = self.model.predict(image)
new_class = np.argmax(np.ravel(predict_value))
confident = np.amax(np.ravel(predict_value))
return new_class, confident
# To train a neural network.
def train_network(self):
# Train an mnist model.
if self.data_set == 'mnist':
batch_size = 128
num_classes = 10
epochs = 50
img_rows, img_cols = 28, 28
(x_train, y_train), (x_test, y_test) = mnist.load_data()
x_train = x_train.reshape(x_train.shape[0], img_rows, img_cols, 1)
x_test = x_test.reshape(x_test.shape[0], img_rows, img_cols, 1)
input_shape = (img_rows, img_cols, 1)
x_train = x_train.astype('float32')
x_test = x_test.astype('float32')
x_train /= 255
x_test /= 255
y_train = keras.utils.np_utils.to_categorical(y_train, num_classes)
y_test = keras.utils.np_utils.to_categorical(y_test, num_classes)
model = Sequential()
model.add(Conv2D(32, (3, 3), activation='relu', input_shape=input_shape))
model.add(Conv2D(32, (3, 3), activation='relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Conv2D(64, (3, 3), activation='relu'))
model.add(Conv2D(64, (3, 3), activation='relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Flatten())
model.add(Dense(200, activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(200, activation='relu'))
model.add(Dense(num_classes, activation='softmax'))
model.compile(loss='categorical_crossentropy',
optimizer=keras.optimizers.Adadelta(),
metrics=['accuracy'])
model.fit(x_train, y_train,
batch_size=batch_size,
epochs=epochs,
verbose=1,
validation_data=(x_test, y_test))
score = model.evaluate(x_test, y_test, verbose=0)
print("Test loss:", score[0])
print("Test accuracy:", score[1])
self.model = model
# Train a cifar10 model.
elif self.data_set == 'cifar10':
batch_size = 128
num_classes = 10
epochs = 50
img_rows, img_cols, img_chls = 32, 32, 3
data_augmentation = True
(x_train, y_train), (x_test, y_test) = cifar10.load_data()
x_train = x_train.reshape(x_train.shape[0], img_rows, img_cols, img_chls)
x_test = x_test.reshape(x_test.shape[0], img_rows, img_cols, img_chls)
input_shape = (img_rows, img_cols, img_chls)
x_train = x_train.astype('float32')
x_test = x_test.astype('float32')
x_train /= 255
x_test /= 255
y_train = keras.utils.np_utils.to_categorical(y_train, num_classes)
y_test = keras.utils.np_utils.to_categorical(y_test, num_classes)
model = Sequential()
model.add(Conv2D(64, (3, 3), activation='relu', input_shape=input_shape))
model.add(Conv2D(64, (3, 3), activation='relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Conv2D(128, (3, 3), activation='relu'))
model.add(Conv2D(128, (3, 3), activation='relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Flatten())
model.add(Dense(256, activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(256, activation='relu'))
model.add(Dense(num_classes, activation='softmax'))
opt = keras.optimizers.rmsprop(lr=0.0001, decay=1e-6)
model.compile(loss='categorical_crossentropy',
optimizer=opt,
metrics=['accuracy'])
if not data_augmentation:
print("Not using data augmentation.")
model.fit(x_train, y_train,
batch_size=batch_size,
epochs=epochs,
validation_data=(x_test, y_test),
shuffle=True)
else:
print("Using real-time data augmentation.")
datagen = ImageDataGenerator(
featurewise_center=False,
samplewise_center=False,
featurewise_std_normalization=False,
samplewise_std_normalization=False,
zca_whitening=False,
rotation_range=0,
width_shift_range=0.1,
height_shift_range=0.1,
horizontal_flip=True,
vertical_flip=False)
datagen.fit(x_train)
model.fit_generator(datagen.flow(x_train, y_train,
batch_size=batch_size),
epochs=epochs,
validation_data=(x_test, y_test),
workers=4)
scores = model.evaluate(x_test, y_test, verbose=0)
print("Test loss:", scores[0])
print("Test accuracy:", scores[1])
self.model = model
# Train a gtsrb model.
elif self.data_set == 'gtsrb':
batch_size = 128
num_classes = 43
epochs = 50
img_rows, img_cols, img_chls = 48, 48, 3
data_augmentation = True
train = DataSet('gtsrb', 'training')
x_train, y_train = train.x, train.y
test = DataSet('gtsrb', 'test')
x_test, y_test = test.x, test.y
input_shape = (img_rows, img_cols, img_chls)
model = Sequential()
model.add(Conv2D(64, (3, 3), activation='relu', input_shape=input_shape))
model.add(Conv2D(64, (3, 3), activation='relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Conv2D(128, (3, 3), activation='relu'))
model.add(Conv2D(128, (3, 3), activation='relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Flatten())
model.add(Dense(256, activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(256, activation='relu'))
model.add(Dense(num_classes, activation='softmax'))
opt = keras.optimizers.rmsprop(lr=0.0001, decay=1e-6)
model.compile(loss='categorical_crossentropy',
optimizer=opt,
metrics=['accuracy'])
if not data_augmentation:
print("Not using data augmentation.")
model.fit(x_train, y_train,
batch_size=batch_size,
epochs=epochs,
validation_data=(x_test, y_test),
shuffle=True)
else:
print("Using real-time data augmentation.")
datagen = ImageDataGenerator(
featurewise_center=False,
samplewise_center=False,
featurewise_std_normalization=False,
samplewise_std_normalization=False,
zca_whitening=False,
rotation_range=0,
width_shift_range=0.1,
height_shift_range=0.1,
horizontal_flip=True,
vertical_flip=False)
datagen.fit(x_train)
model.fit_generator(datagen.flow(x_train, y_train,
batch_size=batch_size),
epochs=epochs,
validation_data=(x_test, y_test),
workers=4)
scores = model.evaluate(x_test, y_test, verbose=0)
print("Test loss:", scores[0])
print("Test accuracy:", scores[1])
self.model = model
else:
print("Unsupported dataset %s. Try 'mnist' or 'cifar10' or 'gtsrb'." % self.data_set)
self.save_network()
# To save the neural network to disk.
def save_network(self):
if self.data_set == 'mnist':
self.model.save('models/mnist.h5')
print("Neural network saved to disk.")
elif self.data_set == 'cifar10':
self.model.save('models/cifar10.h5')
print("Neural network saved to disk.")
elif self.data_set == 'gtsrb':
self.model.save('models/gtsrb.h5')
print("Neural network saved to disk.")
else:
print("save_network: Unsupported dataset.")
# To load a neural network from disk.
def load_network(self):
if self.data_set == 'mnist':
self.model = load_model('models/mnist.h5')
print("Neural network loaded from disk.")
elif self.data_set == 'cifar10':
self.model = load_model('models/cifar10.h5')
print("Neural network loaded from disk.")
elif self.data_set == 'gtsrb':
try:
self.model = load_model('models/gtsrb.h5')
print("Neural network loaded from disk.")
except (IOError, OSError):
self.train_network()
else:
print("load_network: Unsupported dataset.")
def save_input(self, image, filename):
image = Image.array_to_img(image.copy())
plt.imsave(filename, image)
# causes discrepancy
# image_cv = copy.deepcopy(image)
# cv2.imwrite(filename, image_cv * 255.0, [cv2.IMWRITE_PNG_COMPRESSION, 9])
def get_label(self, index):
if self.data_set == 'mnist':
labels = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
elif self.data_set == 'cifar10':
labels = ['airplane', 'automobile', 'bird', 'cat', 'deer', 'dog', 'frog', 'horse', 'ship', 'truck']
elif self.data_set == 'gtsrb':
labels = ['speed limit 20 (prohibitory)', 'speed limit 30 (prohibitory)',
'speed limit 50 (prohibitory)', 'speed limit 60 (prohibitory)',
'speed limit 70 (prohibitory)', 'speed limit 80 (prohibitory)',
'restriction ends 80 (other)', 'speed limit 100 (prohibitory)',
'speed limit 120 (prohibitory)', 'no overtaking (prohibitory)',
'no overtaking (trucks) (prohibitory)', 'priority at next intersection (danger)',
'priority road (other)', 'give way (other)', 'stop (other)',
'no traffic both ways (prohibitory)', 'no trucks (prohibitory)',
'no entry (other)', 'danger (danger)', 'bend left (danger)',
'bend right (danger)', 'bend (danger)', 'uneven road (danger)',
'slippery road (danger)', 'road narrows (danger)', 'construction (danger)',
'traffic signal (danger)', 'pedestrian crossing (danger)', 'school crossing (danger)',
'cycles crossing (danger)', 'snow (danger)', 'animals (danger)',
'restriction ends (other)', 'go right (mandatory)', 'go left (mandatory)',
'go straight (mandatory)', 'go right or straight (mandatory)',
'go left or straight (mandatory)', 'keep right (mandatory)',
'keep left (mandatory)', 'roundabout (mandatory)',
'restriction ends (overtaking) (other)', 'restriction ends (overtaking (trucks)) (other)']
else:
print("LABELS: Unsupported dataset.")
return labels[index]
# Get softmax logits, i.e., the inputs to the softmax function of the classification layer,
# as softmax probabilities may be too close to each other after just one pixel manipulation.
def softmax_logits(self, manipulated_images, batch_size=512):
model = self.model
func = K.function([model.layers[0].input] + [K.learning_phase()],
[model.layers[model.layers.__len__() - 1].output.op.inputs[0]])
# func = K.function([model.layers[0].input] + [K.learning_phase()],
# [model.layers[model.layers.__len__() - 1].output])
if len(manipulated_images) >= batch_size:
softmax_logits = []
batch, remainder = divmod(len(manipulated_images), batch_size)
for b in range(batch):
logits = func([manipulated_images[b * batch_size:(b + 1) * batch_size], 0])[0]
softmax_logits.append(logits)
softmax_logits = np.asarray(softmax_logits)
softmax_logits = softmax_logits.reshape(batch * batch_size, model.output_shape[1])
# note that here if logits is empty, it is fine, as it won't be concatenated.
logits = func([manipulated_images[batch * batch_size:len(manipulated_images)], 0])[0]
softmax_logits = np.concatenate((softmax_logits, logits), axis=0)
else:
softmax_logits = func([manipulated_images, 0])[0]
# softmax_logits = func([manipulated_images, 0])[0]
# print(softmax_logits.shape)
return softmax_logits