先说实验成功的代码：

git clone https://github.com/tkwoo/anogan-keras.git

mkdir weights

python main.py --mode train

即可看到效果了！

核心代码：main.py

from __future__ import print_function

import matplotlib

matplotlib.use('Qt5Agg')

import os

import cv2

import numpy as np

import matplotlib.pyplot as plt

from keras.datasets import mnist

import argparse

import anogan

os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'

parser = argparse.ArgumentParser()

parser.add_argument('--img_idx', type=int, default=14)

parser.add_argument('--label_idx', type=int, default=7)

parser.add_argument('--mode', type=str, default='test', help='train, test')

args = parser.parse_args()

### 0. prepare data

(X_train, y_train), (X_test, y_test) = mnist.load_data()

X_train = (X_train.astype(np.float32) - 127.5) / 127.5

X_test = (X_test.astype(np.float32) - 127.5) / 127.5

X_train = X_train[:,:,:,None]

X_test = X_test[:,:,:,None]

X_test_original = X_test.copy()

X_train = X_train[y_train==1]

X_test = X_test[y_test==1]

print ('train shape:', X_train.shape)

### 1. train generator & discriminator

if args.mode == 'train':

    Model_d, Model_g = anogan.train(64, X_train)

### 2. test generator

generated_img = anogan.generate(25)

img = anogan.combine_images(generated_img)

img = (img*127.5)+127.5

img = img.astype(np.uint8)

img = cv2.resize(img, None, fx=4, fy=4, interpolation=cv2.INTER_NEAREST)

### opencv view

# cv2.namedWindow('generated', 0)

# cv2.resizeWindow('generated', 256, 256)

# cv2.imshow('generated', img)

# cv2.imwrite('result_latent_10/generator.png', img)

# cv2.waitKey()

### plt view

# plt.figure(num=0, figsize=(4, 4))

# plt.title('trained generator')

# plt.imshow(img, cmap=plt.cm.gray)

# plt.show()

# exit()

### 3. other class anomaly detection

def anomaly_detection(test_img, g=None, d=None):

    model = anogan.anomaly_detector(g=g, d=d)

    ano_score, similar_img = anogan.compute_anomaly_score(model, test_img.reshape(1, 28, 28, 1), iterations=500, d=d)

    # anomaly area, 255 normalization

    np_residual = test_img.reshape(28,28,1) - similar_img.reshape(28,28,1)

    np_residual = (np_residual + 2)/4

    np_residual = (255*np_residual).astype(np.uint8)

    original_x = (test_img.reshape(28,28,1)*127.5+127.5).astype(np.uint8)

    similar_x = (similar_img.reshape(28,28,1)*127.5+127.5).astype(np.uint8)

    original_x_color = cv2.cvtColor(original_x, cv2.COLOR_GRAY2BGR)

    residual_color = cv2.applyColorMap(np_residual, cv2.COLORMAP_JET)

    show = cv2.addWeighted(original_x_color, 0.3, residual_color, 0.7, 0.)

    return ano_score, original_x, similar_x, show

### compute anomaly score - sample from test set

# test_img = X_test_original[y_test==1][30]

### compute anomaly score - sample from strange image

# test_img = X_test_original[y_test==0][30]

### compute anomaly score - sample from strange image

img_idx = args.img_idx

label_idx = args.label_idx

test_img = X_test_original[y_test==label_idx][img_idx]

# test_img = np.random.uniform(-1,1, (28,28,1))

start = cv2.getTickCount()

score, qurey, pred, diff = anomaly_detection(test_img)

time = (cv2.getTickCount() - start) / cv2.getTickFrequency() * 1000

print ('%d label, %d : done'%(label_idx, img_idx), '%.2f'%score, '%.2fms'%time)

# cv2.imwrite('./qurey.png', qurey)

# cv2.imwrite('./pred.png', pred)

# cv2.imwrite('./diff.png', diff)

## matplot view

plt.figure(1, figsize=(3, 3))

plt.title('query image')

plt.imshow(qurey.reshape(28,28), cmap=plt.cm.gray)

print("anomaly score : ", score)

plt.figure(2, figsize=(3, 3))

plt.title('generated similar image')

plt.imshow(pred.reshape(28,28), cmap=plt.cm.gray)

plt.figure(3, figsize=(3, 3))

plt.title('anomaly detection')

plt.imshow(cv2.cvtColor(diff,cv2.COLOR_BGR2RGB))

plt.show()

### 4. tsne feature view

### t-SNE embedding

### generating anomaly image for test (radom noise image)

from sklearn.manifold import TSNE

random_image = np.random.uniform(0, 1, (100, 28, 28, 1))

print("random noise image")

plt.figure(4, figsize=(2, 2))

plt.title('random noise image')

plt.imshow(random_image[0].reshape(28,28), cmap=plt.cm.gray)

# intermidieate output of discriminator

model = anogan.feature_extractor()

feature_map_of_random = model.predict(random_image, verbose=1)

feature_map_of_minist = model.predict(X_test_original[y_test != 1][:300], verbose=1)

feature_map_of_minist_1 = model.predict(X_test[:100], verbose=1)

# t-SNE for visulization

output = np.concatenate((feature_map_of_random, feature_map_of_minist, feature_map_of_minist_1))

output = output.reshape(output.shape[0], -1)

anomaly_flag = np.array([1]*100+ [0]*300)

X_embedded = TSNE(n_components=2).fit_transform(output)

plt.figure(5)

plt.title("t-SNE embedding on the feature representation")

plt.scatter(X_embedded[:100,0], X_embedded[:100,1], label='random noise(anomaly)')

plt.scatter(X_embedded[100:400,0], X_embedded[100:400,1], label='mnist(anomaly)')

plt.scatter(X_embedded[400:,0], X_embedded[400:,1], label='mnist(normal)')

plt.legend()

plt.show()

anogan.py

from __future__ import print_function

from keras.models import Sequential, Model

from keras.layers import Input, Reshape, Dense, Dropout, MaxPooling2D, Conv2D, Flatten

from keras.layers import Conv2DTranspose, LeakyReLU

from keras.layers.core import Activation

from keras.layers.normalization import BatchNormalization

from keras.optimizers import Adam, RMSprop

from keras import backend as K

from keras import initializers

import tensorflow as tf

import numpy as np

from tqdm import tqdm

import cv2

import math

from keras.utils. generic_utils import Progbar

### combine images for visualization

def combine_images(generated_images):

    num = generated_images.shape[0]

    width = int(math.sqrt(num))

    height = int(math.ceil(float(num)/width))

    shape = generated_images.shape[1:4]

    image = np.zeros((height*shape[0], width*shape[1], shape[2]),

                     dtype=generated_images.dtype)

    for index, img in enumerate(generated_images):

        i = int(index/width)

        j = index % width

        image[i*shape[0]:(i+1)*shape[0], j*shape[1]:(j+1)*shape[1],:] = img[:, :, :]

    return image

### generator model define

def generator_model():

    inputs = Input((10,))

    fc1 = Dense(input_dim=10, units=128*7*7)(inputs)

    fc1 = BatchNormalization()(fc1)

    fc1 = LeakyReLU(0.2)(fc1)

    fc2 = Reshape((7, 7, 128), input_shape=(128*7*7,))(fc1)

    up1 = Conv2DTranspose(64, (2, 2), strides=(2, 2), padding='same')(fc2)

    conv1 = Conv2D(64, (3, 3), padding='same')(up1)

    conv1 = BatchNormalization()(conv1)

    conv1 = Activation('relu')(conv1)

    up2 = Conv2DTranspose(64, (2, 2), strides=(2, 2), padding='same')(conv1)

    conv2 = Conv2D(1, (5, 5), padding='same')(up2)

    outputs = Activation('tanh')(conv2)

    model = Model(inputs=[inputs], outputs=[outputs])

    return model

### discriminator model define

def discriminator_model():

    inputs = Input((28, 28, 1))

    conv1 = Conv2D(64, (5, 5), padding='same')(inputs)

    conv1 = LeakyReLU(0.2)(conv1)

    pool1 = MaxPooling2D(pool_size=(2, 2))(conv1)

    conv2 = Conv2D(128, (5, 5), padding='same')(pool1)

    conv2 = LeakyReLU(0.2)(conv2)

    pool2 = MaxPooling2D(pool_size=(2, 2))(conv2)

    fc1 = Flatten()(pool2)

    fc1 = Dense(1)(fc1)

    outputs = Activation('sigmoid')(fc1)

    model = Model(inputs=[inputs], outputs=[outputs])

    return model

### d_on_g model for training generator

def generator_containing_discriminator(g, d):

    d.trainable = False

    ganInput = Input(shape=(10,))

    x = g(ganInput)

    ganOutput = d(x)

    gan = Model(inputs=ganInput, outputs=ganOutput)

    # gan.compile(loss='binary_crossentropy', optimizer='adam')

    return gan

def load_model():

    d = discriminator_model()

    g = generator_model()

    d_optim = RMSprop()

    g_optim = RMSprop(lr=0.0002)

    g.compile(loss='binary_crossentropy', optimizer=g_optim)

    d.compile(loss='binary_crossentropy', optimizer=d_optim)

    d.load_weights('./weights/discriminator.h5')

    g.load_weights('./weights/generator.h5')

    return g, d

### train generator and discriminator

def train(BATCH_SIZE, X_train):

    ### model define

    d = discriminator_model()

    g = generator_model()

    d_on_g = generator_containing_discriminator(g, d)

    d_optim = RMSprop(lr=0.0004)

    g_optim = RMSprop(lr=0.0002)

    g.compile(loss='mse', optimizer=g_optim)

    d_on_g.compile(loss='mse', optimizer=g_optim)

    d.trainable = True

    d.compile(loss='mse', optimizer=d_optim)

    for epoch in range(10):

        print ("Epoch is", epoch)

        n_iter = int(X_train.shape[0]/BATCH_SIZE)

        progress_bar = Progbar(target=n_iter)

        for index in range(n_iter):

            # create random noise -> U(0,1) 10 latent vectors

            noise = np.random.uniform(0, 1, size=(BATCH_SIZE, 10))

            # load real data & generate fake data

            image_batch = X_train[index*BATCH_SIZE:(index+1)*BATCH_SIZE]

            generated_images = g.predict(noise, verbose=0)

            # visualize training results

            if index % 20 == 0:

                image = combine_images(generated_images)

                image = image*127.5+127.5

                cv2.imwrite('./result/'+str(epoch)+"_"+str(index)+".png", image)

            # attach label for training discriminator

            X = np.concatenate((image_batch, generated_images))

            y = np.array([1] * BATCH_SIZE + [0] * BATCH_SIZE)

            # training discriminator

            d_loss = d.train_on_batch(X, y)

            # training generator

            d.trainable = False

            g_loss = d_on_g.train_on_batch(noise, np.array([1] * BATCH_SIZE))

            d.trainable = True

            progress_bar.update(index, values=[('g',g_loss), ('d',d_loss)])

        print ('')

        # save weights for each epoch

        g.save_weights('weights/generator.h5', True)

        d.save_weights('weights/discriminator.h5', True)

    return d, g

### generate images

def generate(BATCH_SIZE):

    g = generator_model()

    g.load_weights('weights/generator.h5')

    noise = np.random.uniform(0, 1, (BATCH_SIZE, 10))

    generated_images = g.predict(noise)

    return generated_images

### anomaly loss function

def sum_of_residual(y_true, y_pred):

    return K.sum(K.abs(y_true - y_pred))

### discriminator intermediate layer feautre extraction

def feature_extractor(d=None):

    if d is None:

        d = discriminator_model()

        d.load_weights('weights/discriminator.h5')

    intermidiate_model = Model(inputs=d.layers[0].input, outputs=d.layers[-7].output)

    intermidiate_model.compile(loss='binary_crossentropy', optimizer='rmsprop')

    return intermidiate_model

### anomaly detection model define

def anomaly_detector(g=None, d=None):

    if g is None:

        g = generator_model()

        g.load_weights('weights/generator.h5')

    intermidiate_model = feature_extractor(d)

    intermidiate_model.trainable = False

    g = Model(inputs=g.layers[1].input, outputs=g.layers[-1].output)

    g.trainable = False

    # Input layer cann't be trained. Add new layer as same size & same distribution

    aInput = Input(shape=(10,))

    gInput = Dense((10), trainable=True)(aInput)

    gInput = Activation('sigmoid')(gInput)

    # G & D feature

    G_out = g(gInput)

    D_out= intermidiate_model(G_out)

    model = Model(inputs=aInput, outputs=[G_out, D_out])

    model.compile(loss=sum_of_residual, loss_weights= [0.90, 0.10], optimizer='rmsprop')

    # batchnorm learning phase fixed (test) : make non trainable

    K.set_learning_phase(0)

    return model

### anomaly detection

def compute_anomaly_score(model, x, iterations=500, d=None):

    z = np.random.uniform(0, 1, size=(1, 10))

    intermidiate_model = feature_extractor(d)

    d_x = intermidiate_model.predict(x)

    # learning for changing latent

    loss = model.fit(z, [x, d_x], batch_size=1, epochs=iterations, verbose=0)

    similar_data, _ = model.predict(z)

    loss = loss.history['loss'][-1]

    return loss, similar_data

效果图：

detect strange imager never seen!!! refer:https://github.com/yjucho1/anoGAN

## compute anomaly score - sample from strange image

test_img = plt.imread('assets/test_img.png')

test_img = test_img[:,:,0]

model = anogan.anomaly_detector()

ano_score, similar_img = anogan.compute_anomaly_score(model, test_img.reshape(1, 28, 28, 1))

plt.figure(figsize=(2, 2))

plt.imshow(test_img.reshape(28,28), cmap=plt.cm.gray)

plt.show()

print("anomaly score : " + str(ano_score))

plt.figure(figsize=(2, 2))

plt.imshow(test_img.reshape(28,28), cmap=plt.cm.gray)

residual  = test_img.reshape(28,28) - similar_img.reshape(28, 28)

plt.imshow(residual, cmap='jet', alpha=.5)

plt.show()


anomaly score : 446.46844482421875

https://github.com/yjucho1/anoGAN

from keras.models import Sequential, Model

from keras.layers import Input, Reshape, Dense, Dropout, UpSampling2D, Conv2D, Flatten

from keras.layers.advanced_activations import LeakyReLU

from keras.optimizers import Adam

from keras import backend as K

from keras import initializers

import tensorflow as tf

import numpy as np

from tqdm import tqdm

def generator_model():

    generator = Sequential()

    generator.add(Dense(128*7*7, input_dim=100, kernel_initializer=initializers.RandomNormal(stddev=0.02)))

    generator.add(LeakyReLU(0.2))

    generator.add(Reshape((7, 7, 128)))

    generator.add(UpSampling2D(size=(2, 2)))

    generator.add(Conv2D(64, kernel_size=(5, 5), padding='same'))

    generator.add(LeakyReLU(0.2))

    generator.add(UpSampling2D(size=(2, 2)))

    generator.add(Conv2D(1, kernel_size=(5, 5), padding='same', activation='tanh'))

    generator.compile(loss='binary_crossentropy', optimizer='adam')

    return generator

def discriminator_model():

    discriminator = Sequential()

    discriminator.add(Conv2D(64, kernel_size=(5, 5), strides=(2, 2), padding='same', input_shape=(28,28, 1), kernel_initializer=initializers.RandomNormal(stddev=0.02)))

    discriminator.add(LeakyReLU(0.2))

    discriminator.add(Dropout(0.3))

    discriminator.add(Conv2D(128, kernel_size=(5, 5), strides=(2, 2), padding='same'))

    discriminator.add(LeakyReLU(0.2))

    discriminator.add(Dropout(0.3))

    discriminator.add(Flatten())

    discriminator.add(Dense(1, activation='sigmoid'))

    discriminator.compile(loss='binary_crossentropy', optimizer='adam')

    return discriminator

def generator_containing_discriminator(g, d):

    d.trainable = False

    ganInput = Input(shape=(100,))

    x = g(ganInput)

    ganOutput = d(x)

    gan = Model(inputs=ganInput, outputs=ganOutput)

    gan.compile(loss='binary_crossentropy', optimizer='adam')

    return gan

def train(BATCH_SIZE, X_train):

    d = discriminator_model()

    print("#### discriminator ######")

    d.summary()

    g = generator_model()

    print("#### generator ######")

    g.summary()

    d_on_g = generator_containing_discriminator(g, d)

    d.trainable = True

    for epoch in tqdm(range(200)):

        for index in range(int(X_train.shape[0]/BATCH_SIZE)):

            noise = np.random.uniform(0, 1, size=(BATCH_SIZE, 100))

            image_batch = X_train[index*BATCH_SIZE:(index+1)*BATCH_SIZE]

            generated_images = g.predict(noise, verbose=0)

            X = np.concatenate((image_batch, generated_images))

            y = np.array([1] * BATCH_SIZE + [0] * BATCH_SIZE)

            d_loss = d.train_on_batch(X, y)

            noise = np.random.uniform(0, 1, (BATCH_SIZE, 100))

            d.trainable = False

            g_loss = d_on_g.train_on_batch(noise, np.array([1] * BATCH_SIZE))

            d.trainable = True

        g.save_weights('assets/generator', True)

        d.save_weights('assets/discriminator', True)

    return d, g

def generate(BATCH_SIZE):

    g = generator_model()

    g.load_weights('assets/generator')

    noise = np.random.uniform(0, 1, (BATCH_SIZE, 100))

    generated_images = g.predict(noise)

    return generated_images

def sum_of_residual(y_true, y_pred):

    return tf.reduce_sum(abs(y_true - y_pred))

def feature_extractor():

    d = discriminator_model()

    d.load_weights('assets/discriminator')

    intermidiate_model = Model(inputs=d.layers[0].input, outputs=d.layers[-5].output)

    intermidiate_model.compile(loss='binary_crossentropy', optimizer='adam')

    return intermidiate_model

def anomaly_detector():

    g = generator_model()

    g.load_weights('assets/generator')

    g.trainable = False

    intermidiate_model = feature_extractor()

    intermidiate_model.trainable = False

    aInput = Input(shape=(100,))

    gInput = Dense((100))(aInput)

    G_out = g(gInput)

    D_out= intermidiate_model(G_out)

    model = Model(inputs=aInput, outputs=[G_out, D_out])

    model.compile(loss=sum_of_residual, loss_weights= [0.9, 0.1], optimizer='adam')

    return model

def compute_anomaly_score(model, x):

    z = np.random.uniform(0, 1, size=(1, 100))

    intermidiate_model = feature_extractor()

    d_x = intermidiate_model.predict(x)

    loss = model.fit(z, [x, d_x], epochs=500, verbose=0)

    similar_data, _ = model.predict(z)

    return loss.history['loss'][-1], similar_data

　

GAN异常检测的一些实验

要做基于GANomaly的异常检测实验，需要准备大量的OK样本和少量的NG样本。找不到合适的数据集怎么办？很简单，随便找个开源的分类数据集，将其中一个类别的样本当作异常类别，其他所有类别的样本当作正常样本即可，文章中的实验就是这么干的。具体试验结果如下：

反正在效果上，GANomaly是超过了之前两种代表性的方法。此外，作者还做了性能对比的实验。事实上前面已经介绍了GANomaly的推断方法，就是一个简单的前向传播和一个对比阈值的过程，因此速度非常快。具体结果如下：

可以看出，计算性能上，GANomaly表现也是非常不错的。

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