def __init__(self):
self.image_shape = (config.IMG_HEIGHT, config.IMG_WIDTH,
config.CHANNELS)
self.optimizer = tf.keras.optimizers.RMSprop(
learning_rate=config.LEARNING_RATE)
self.kernel_init = tf.keras.initializers.RandomNormal(stddev=0.02)
self.constraint = ClipConstraint(0.01)
print("Loading Data...")
(self.train_images, _), (_, _) = fashion_mnist.load_data()
print("Normalizing Data...")
self.train_images = self.train_images / 127.5 - 1.
self.train_images = np.expand_dims(self.train_images, axis=3)
print("Train Data Shape : ", self.train_images.shape)
print()
print("Building Generator...")
self.generator = self.build_generator()
print("Building Discriminator...")
self.discriminator = self.build_discriminator()
self.generator_losses = []
self.discriminator_losses = []
def load_image(data_source: str):
"""
Loads one of the following image datasets: {mnist, famnist, cifar10}.
Normalizes the data. Returns X and y.
"""
reshape_shape = -1, 28, 28, 1
if data_source == "mnist":
(X_train, y_train), (X_test, y_test) = mnist.load_data()
elif data_source == "famnist":
(X_train, y_train), (X_test, y_test) = fashion_mnist.load_data()
elif data_source == "cifar10":
(X_train, y_train), (X_test, y_test) = cifar10.load_data()
reshape_shape = -1, 32, 32, 3
else:
raise ValueError("No valid `data_source`.")
X = np.concatenate((
X_train,
X_test)) # Combine train/test to make new train/test/validate later on
y = np.concatenate((y_train, y_test))
X = X.reshape(reshape_shape)
X = X / 255 # /= is not available when casting int to float: https://stackoverflow.com/a/48948461/10603874
y = y.reshape(y.shape[0], )
return X, y
def load_dataset_expanddim(self, random_state=42):
(x_train, y_train), (x_test, y_test) = dataset.load_data()
# Expand dimensions of datasets
x_train_1, x_test_1 = np.expand_dims(x_train,
axis=3), np.expand_dims(x_test,
axis=3)
# Rescale the images from [0,255] to the [0.0, 1.0] range.
x_train_1, x_test_1 = np.array(x_train,
dtype=np.float32) / 255.0, np.array(
x_test, dtype=np.float32) / 255.0
y_train_1, y_test_1 = tf.keras.utils.to_categorical(
y_train, 10,
dtype=np.uint8), tf.keras.utils.to_categorical(y_test,
10,
dtype=np.uint8)
x_val, x_test, y_val, y_test = train_test_split(
x_test_1, y_test_1, test_size=0.2, random_state=random_state)
print("Shape of original training examples:", np.shape(x_train_1))
print("Shape of original validation examples:", np.shape(x_val))
print("Shape of original test examples:", np.shape(x_test))
print("Shape of original training result:", np.shape(y_train_1))
print("Shape of original validation result:", np.shape(y_val))
print("Shape of original test result:", np.shape(y_test))
return (x_train_1, y_train_1), (x_val, y_val), (x_test, y_test)
def load_image(source: str):
"""
Loads the image datasets: mnist, famnist, cifar10.
:return: (X_train, y_train, X_test, y_test)
"""
reshape_shape = -1, 28, 28, 1
if source == "mnist":
(X_train, y_train), (X_test, y_test) = mnist.load_data()
elif source == "famnist":
(X_train, y_train), (X_test, y_test) = fashion_mnist.load_data()
elif source == "cifar10":
(X_train, y_train), (X_test, y_test) = cifar10.load_data()
reshape_shape = -1, 32, 32, 3
else:
raise ValueError("Specify a valid source.")
X_train = X_train.reshape(reshape_shape).astype(np.float32)
X_test = X_test.reshape(reshape_shape).astype(np.float32)
X_train /= 255
X_test /= 255
y_train = y_train.reshape(y_train.shape[0], ).astype(np.int32)
y_test = y_test.reshape(y_test.shape[0], ).astype(np.int32)
return X_train, y_train, X_test, y_test
def _load_data(self): # pragma: no cover
(x_train, y_train), (x_test, y_test) = fashion_mnist.load_data()
train = Dataset(x_train, y_train, self.x_type, self.y_type)
test = Dataset(x_test, y_test, self.x_type, self.y_type)
return train, test, None
def load_dataset():
(X_train, y_train), (X_test, y_test) = fm.load_data()
X_train = X_train.astype('float32') / 255.0
X_test = X_test.astype('float32') / 255.0
X_train = np.expand_dims(X_train, axis=3)
X_test = np.expand_dims(X_test, axis=3)
label_binarizer = LabelBinarizer()
y_train = label_binarizer.fit_transform(y_train)
y_test = label_binarizer.fit_transform(y_test)
(X_train, X_val, y_train, y_val) = train_test_split(X_train,
y_train,
train_size=0.8)
train_ds = (tf.data.Dataset.from_tensor_slices((X_train, y_train)))
val_ds = (tf.data.Dataset.from_tensor_slices((X_val, y_val)))
test_ds = (tf.data.Dataset.from_tensor_slices((X_test, y_test)))
train_ds = (train_ds.shuffle(
buffer_size=BUFFER_SIZE).batch(BATCH_SIZE).prefetch(
buffer_size=BUFFER_SIZE))
val_ds = (val_ds.batch(BATCH_SIZE).prefetch(buffer_size=BUFFER_SIZE))
test_ds = test_ds.batch(BATCH_SIZE)
return train_ds, val_ds, test_ds
def fmnist_sandal_sneaker():
"""
Classes:
0 T-shirt/top
1 Trouser
2 Pullover
3 Dress
4 Coat
5 Sandal
6 Shirt
7 Sneaker
8 Bag
9 Ankle boot
train: (12000, 784), test: (2000, 784)
"""
eps_dataset = 0.1
classes = [5, 7] # 5 is 1, 7 is -1 in the binary classification scheme
(X_train, y_train), (X_test, y_test) = fashion_mnist.load_data()
X_train, X_test = X_train.astype(np.float64) / 255.0, X_test.astype(
np.float64) / 255.0
X_train = np.reshape(X_train, [X_train.shape[0], -1])
X_test = np.reshape(X_test, [X_test.shape[0], -1])
X_train, y_train, X_test, y_test = binary_from_multiclass(
X_train, y_train, X_test, y_test, classes)
return X_train, y_train, X_test, y_test, eps_dataset
def solution_model():
fashion_mnist = tf.keras.datasets.fashion_mnist
(x_train, y_train), (x_test, y_test) = fashion_mnist.load_data()
# YOUR CODE HERE
model = Sequential()
model.add(
Conv1D(filters=64,
input_shape=(28, 28),
activation='relu',
kernel_size=(3),
strides=1,
padding='valid'))
model.add(Dropout(0.5))
model.add(MaxPooling1D(pool_size=2))
model.add(Flatten())
model.add(Dense(64))
model.add(Dense(32))
model.add(Dense(10, activation='softmax'))
return model
model.compile(optimizer='adam',
loss='categorical_crossentropy',
metrics=['acc'])
model.fit(x_train,
y_train,
epochs=100,
validation_size=0.2,
verbose=1,
batch_size=32)
def load(dataset='f-mnist'):
'''
iris, mnist, fashion mnist のデータを読み込む
デフォルトはfashion mnist
mnist, fashion mnist は255で除算し最大値1に正規化
iris は、MinMaxScalerで正規化
'''
if dataset == 'iris':
iris = load_iris()
x = iris.data
y = iris.target
mms = MinMaxScaler()
x = mms.fit_transform(x)
elif dataset == 'mnist':
(x, y), (x2, y2) = mnist.load_data()
x = np.concatenate([x, x2], axis=0)
y = np.concatenate([y, y2], axis=0)
x = np.expand_dims(x, axis=-1)
x = x / 255.
else:
(x, y), (x2, y2) = fashion_mnist.load_data()
x = np.concatenate([x, x2], axis=0)
y = np.concatenate([y, y2], axis=0)
x = np.expand_dims(x, axis=-1)
x = x / 255.
return x, y
def load_fashion_mnist(self):
"""
Load the FASHION MNIST dataset
"""
logging.info("loading FASHION MNIST dataset...")
# Load the data
(self.train_x,
self.train_y), (self.test_x, self.test_y) = fashion_mnist.load_data()
# Reshape data
self.train_x = self.train_x.reshape(60000, 28, 28, 1)
self.test_x = self.test_x.reshape(10000, 28, 28, 1)
# Scale the data to the range [0, 1]
self.train_x = self.train_x.astype('float32') / 255.0
self.test_x = self.test_x.astype('float32') / 255.0
self.height = 28
self.width = 28
self.depth = 1
label_names = [
'T-shirt/top', 'Trouser', 'Pullover', 'Dress', 'Coat', 'Sandal',
'Shirt', 'Sneaker', 'Bag', 'Ankle boot'
]
self.classes_cnt = len(label_names)
def load_dataset():
(x_train, y_train), (x_test, y_test) = fashion_mnist.load_data()
x_train = np.expand_dims(x_train, axis=-1)
x_test = np.expand_dims(x_test, axis=-1)
generator_fs = ImageDataGenerator(
# width_shift_range=4./28.,
# height_shift_range=4./28.,
# fill_mode='reflect',
horizontal_flip=True, )
generator = ImageDataGenerator(
# width_shift_range=4./28.,
# height_shift_range=4./28.,
# fill_mode='reflect',
horizontal_flip=True)
y_train = np.reshape(y_train, [-1, 1])
y_test = np.reshape(y_test, [-1, 1])
x_train = x_train / 127.5 - 1.
x_test = x_test / 127.5 - 1.
output = {
'train': {
'data': x_train,
'label': y_train
},
'test': {
'data': x_test,
'label': y_test
},
'generator': generator,
'generator_fs': generator_fs
}
return output
def test_generators(params):
print(
"Test on MNIST fashion https://www.kaggle.com/zalando-research/fashionmnist"
)
(x_train, y_train), (x_test, y_test) = fashion_mnist.load_data()
num_classes = len(np.unique(y_train))
params['image_size'] = (32, 32, 1)
params['batch_size'] = 400
params['model_file'] = "model.test.fashion_mnist.coronahack.hdf5"
x_train = np.array(
[cv2.resize(x, dsize=params['image_size'][:-1]) for x in x_train])
x_test = np.array(
[cv2.resize(x, dsize=params['image_size'][:-1]) for x in x_test])
x_train = np.expand_dims(x_train, axis=3).astype(
np.float32) / x_train.max()
x_test = np.expand_dims(x_test, axis=3).astype(np.float32) / x_train.max()
y_train = to_categorical(y_train)
y_test = to_categorical(y_test)
train_img_gen = ImageDataGenerator(rescale=1.0 / x_train.max())
test_img_gen = ImageDataGenerator(rescale=1.0 / x_test.max())
train_img_gen.fit(x_train)
test_img_gen.fit(x_test)
train_generator = train_img_gen.flow(x_train,
y_train,
batch_size=params['batch_size'])
val_generator = test_img_gen.flow(x_test,
y_test,
batch_size=params['batch_size'])
return num_classes, train_generator, val_generator
def data_generator(n_samples):
'''yields the first n_samples from the fashion_mnist dataset.
'''
(x_train, y_train), (_, _) = fashion_mnist.load_data()
for sample, target in zip(x_train, y_train[:n_samples]):
yield sample, target
def retrieve_FMNIST(name, shuffle, samples_per_class, list_of_nrs):
"""
retireves fashion-mnist dataset with the required data in the required format
name: name of dataset
shuffle: flag if shuffle or not
samples_per_class: how many samples per class from mnist
list_of_nrs: which number classes
returns: transformed fashion mnist data
"""
(X_train, y_train), (X_test, y_test) = fashion_mnist.load_data()
# extract indices of the wanted numbers
train_filter = np.isin(y_train, list_of_nrs)
test_filter = np.isin(y_test, list_of_nrs)
# extract wanted numbers
X_train, y_train = X_train[train_filter], y_train[train_filter]
X_test, y_test = X_test[test_filter], y_test[test_filter]
#if samples per class is specified find random indices
if samples_per_class != -1:
# extract indices of amount of samples per class wanted
indices = MNIST_extract_shuffled_indices(y_train, list_of_nrs,
samples_per_class)
# apply indices on train data
X_train, y_train = X_train[indices], y_train[indices]
return trans_MNIST(name, X_train, y_train, X_test, y_test)
def train_and_evaluate(output_dir, hparams):
(X_train, y_train), (X_test, y_test) = fashion_mnist.load_data()
model = cnn_model()
model.compile(optimizer=tf.keras.optimizers.Adam(hparams["learning_rate"]),
loss=tf.keras.losses.CategoricalCrossentropy(),
metrics=[tf.keras.metrics.CategoricalAccuracy()])
estimator = tf.keras.estimator.model_to_estimator(keras_model=model,
model_dir=output_dir)
train_spec = tf.estimator.TrainSpec(input_fn=make_input_fn(
X_train, y_train, tf.estimator.ModeKeys.TRAIN, hparams),
max_steps=hparams["train_steps"])
input_column = tf.feature_column.numeric_column("image_input",
shape=(28, 28, 1),
dtype=tf.float32)
serving_input_fn = tf.estimator.export.build_parsing_serving_input_receiver_fn(
tf.feature_column.make_parse_example_spec([input_column]))
exporter = tf.estimator.LatestExporter(
name="exporter", serving_input_receiver_fn=serving_input_fn)
eval_spec = tf.estimator.EvalSpec(input_fn=make_input_fn(
X_test, y_test, tf.estimator.ModeKeys.EVAL, hparams),
exporters=exporter,
steps=None)
tf.estimator.train_and_evaluate(estimator, train_spec, eval_spec)
estimator.saved_model()
def get_input_fn(mode, batch_size=32, num_epochs=1):
(train_x, train_y), (test_x, test_y) = fashion_mnist.load_data()
half = test_x.shape[0] // 2
if mode == tf.estimator.ModeKeys.TRAIN:
input_x, input_y = train_x, train_y
train = True
elif mode == tf.estimator.ModeKeys.EVAL:
input_x, input_y = test_x[:half], test_y[:half]
train = False
elif mode == tf.estimator.ModeKeys.PREDICT:
input_x, input_y = test_x[half:-1], test_y[half:-1]
train = False
else:
raise ValueError("tf.estimator.ModeKeys required!")
def scale_fn(image, label):
return (
(tf.image.convert_image_dtype(image, tf.float32) - 0.5) * 2.0,
tf.cast(label, tf.int32),
)
def input_fn():
dataset = tf.data.Dataset.from_tensor_slices(
(tf.expand_dims(input_x, -1), tf.expand_dims(input_y, -1))
).map(scale_fn)
if train:
dataset = dataset.shuffle(10).repeat(num_epochs)
dataset = dataset.batch(batch_size).prefetch(1)
return dataset
return input_fn
def load_dataset():
# load fashoion mnist dataset
(x_train, y_train), (x_test, y_test) = fashion_mnist.load_data()
# print their shape
print("x_train shape : {}, y_train shape : {}".format(
x_train.shape, y_train.shape))
print("x_test shape : {}, y_test shape : {}".format(
x_test.shape, y_test.shape))
# Normalize the data in range [0,1]
x_train = x_train / 255
x_test = x_test / 255
x_train = x_train.astype("float32")
x_test = x_test.astype("float32")
# Reshape image in 3 dimensions (height = 28px, width = 28px , channel = 1)
x_train = tf.reshape(x_train, [-1, 28, 28, 1])
x_test = tf.reshape(x_test, [-1, 28, 28, 1])
# one hot encoding
y_train = tf.one_hot(y_train, 10)
y_test = tf.one_hot(y_test, 10)
return (x_train, x_test, y_train, y_test)
def train_donnees_mnist(cls):
""""Methode qui charge et prepare des images de l'entrainement FashionMNIST dans le format nécessaire pour l'entraînement.
:return: dataset a utiliser pour l'entraînement
:rtype: class 'tensorflow.python.data.ops.dataset_ops.BatchDataset'
"""
# Chargement de l'ensemble de données MNIST composé de 60000 paires
# image/étiquette d'entraînement et 10000 paires image/étiquette de test
(train_images, train_labels), (test_images,
test_labels) = mnist.load_data()
# Remodelation des donnees: 60000 vecteurs de dimension 784 au lieu des 60000 matrices de dimensions 28x28
train_images = train_images.reshape(60000, 784)
# Conversion de chaque pixel en un nombre flottant 32 bits
train_images = train_images.astype('float32')
# Normalisation des valeurs de chaque pixel pour les rendre entre 0 et 1
train_images = train_images / 255
train_images = 1 - train_images
# Création d'un jeu de données dont les éléments sont des tranches des tenseurs donnés -
# les tenseurs donnés sont découpés le long de leur première dimension
# (division des lots en tenseurs individuels pour itérer sur l'ensemble de données):
train_dataset = tf.data.Dataset.from_tensor_slices(train_images)
# Mélanger les images (tenseurs)
train_dataset = train_dataset.shuffle(buffer_size=1024).batch(64)
return train_dataset
def load_fashion_mnist(single_class=-1):
(train_x, train_y), _ = fashion_mnist.load_data()
train_x = np.expand_dims(train_x, axis=-1)
if single_class != -1:
return normalize_image(train_x[train_y == single_class])
else:
return normalize_image(train_x)
def load_real_samples():
(trainx, _), (testx, _) = fashion_mnist.load_data()
data = np.concatenate([trainx, testx], axis=0)
data = np.expand_dims(data, axis=-1)
x = data.astype(np.float32)
x = (x - 127.5) / 127.5
return x
def get_fashion_images():
"""
Function to load mnist_fashion data set:
* Only using a subset of the data for testing functionality of the model
* Resize the images to 512*512
:return: training and testing data
"""
(x_train, y_train), (x_test, y_test) = fashion_mnist.load_data()
x_train = x_train[0:600]
y_train = y_train[0:600]
x_test = x_test[0:100]
y_test = y_test[0:100]
x_train_new = []
x_test_new = []
for pic in x_train:
upgraded_pic = resize(pic, (512, 512), anti_aliasing=True)
x_train_new.append(upgraded_pic)
x_train_new = np.array(x_train_new)
for pic in x_test:
upgraded_pic = resize(pic, (512, 512), anti_aliasing=True)
x_test_new.append(upgraded_pic)
x_test_new = np.array(x_test_new)
# Encode labels via one-hot encoding
onehot_encoder = OneHotEncoder(sparse=False)
integer_encoded_train = y_train.reshape(len(y_train), 1)
integer_encoded_test = y_test.reshape(len(y_test), 1)
y_train = onehot_encoder.fit_transform(integer_encoded_train)
y_test = onehot_encoder.fit_transform(integer_encoded_test)
return x_train_new, x_test_new, y_train, y_test
def train(self, epochs, batch_size=128, sample_interval=50):
# 데이터셋 로드
(X_train, y_train), (_, _) = fashion_mnist.load_data()
X_train = (X_train.astype(np.float32) - 127.5) / 127.5
X_train = np.expand_dims(X_train, axis=3)
y_train = y_train.reshape(-1, 1)
# Adversarial ground truths
valid = np.ones((batch_size, 1))
fake = np.zeros((batch_size, 1))
D_loss_list = []
G_loss_list = []
for epoch in range(1,epochs+1):
# ---------------------
# 판별자 학습
# ---------------------
# 학습에 사용할 이미지 랜덤으로 선택
idx = np.random.randint(0, X_train.shape[0], batch_size)
imgs, labels = X_train[idx], y_train[idx]
# 노이즈 생성
noise = np.random.normal(0, 1, (batch_size, self.latent_dim))
# 생성자가 이미지 생성
#### (9) 입력으로 noise와 labels을 함께 사용
#### hint: noise와 labels을 하나의 리스트로 모두 입력받습니다.
gen_imgs = self.generator.predict(????)
# 판별자 학습
#### (10) 입력으로 imgs와 labels을 함께 사용
#### hint: imgs와 labels을 하나의 리스트로 모두 입력받습니다.
d_loss_real = self.discriminator.train_on_batch(????, valid)
#### (11) 입력으로 gen_imgs와 labels을 함께 사용
#### hint: gen_imgs와 labels을 하나의 리스트로 모두 입력받습니다.
d_loss_fake = self.discriminator.train_on_batch(????, fake)
d_loss = 0.5 * np.add(d_loss_real, d_loss_fake)
# ---------------------
# 생성자 학습
# ---------------------
sampled_labels = np.random.randint(0, 10, batch_size).reshape(-1, 1)
noise = np.random.normal(0, 1, (batch_size, self.latent_dim))
# 판별자 레이블 샘플을 유효한 것으로 지정
#### (12) 입력으로 noise와 sampled_labels을 함께 사용
#### hint: noise와 sampled_labels을 하나의 리스트로 모두 입력받습니다.
g_loss = self.model.train_on_batch(????, valid)
G_loss_list.append(g_loss)
D_loss_list.append(d_loss[0])
print ("%d [D loss: %f, acc.: %.2f%%] [G loss: %f]" % (epoch, d_loss[0], 100*d_loss[1], g_loss))
if epoch % sample_interval == 0:
self.sample_images(epoch)
self.plotLoss(G_loss_list, D_loss_list, epoch)
def get_fashion_mnist():
(x_data, y_data), (x_test, y_test) = fashion_mnist.load_data()
x_data = x_data.astype(np.float32) / 255
x_data = x_data.reshape(-1, 28, 28, 1)
x_data = x_data * 2. - 1.
y_data = to_categorical(y_data, num_classes=max(y_data) + 1)
return x_data, y_data
def fashion(auto_var, var_value, inter_var):
from tensorflow.keras.datasets import fashion_mnist
(x_train, y_train), (x_test, y_test) = fashion_mnist.load_data()
x_train, x_test = x_train[:, :, :, np.newaxis], x_test[:, :, :, np.newaxis]
x_train, x_test = x_train.astype(np.float32) / 255, x_test.astype(np.float32) / 255
return x_train, y_train, x_test, y_test
def load_dataset():
(train_images, train_labels), (test_images, test_labels) = load_data()
train_images = train_images.reshape(
(train_images.shape[0], 28, 28, 1)) / 255
test_images = test_images.reshape((test_images.shape[0], 28, 28, 1)) / 255
train_labels = to_categorical(train_labels)
test_labels = to_categorical(test_labels)
return train_images, train_labels, test_images, test_labels
def get_fashion_mnist():
(x_train, y_train), (x_test, y_test) = fashion_mnist.load_data()
x_train = x_train.astype(np.float32) / 255
x_train = x_train.reshape(-1, 28, 28, 1) * 2. - 1.
print(y_train.shape, np.max(y_train)+1)
y_train = to_categorical(y_train, num_classes=max(y_train)+1)
print(y_train.shape)
return x_train, y_train
def load_fashion_mnist():
from tensorflow.keras.datasets import fashion_mnist # this requires keras>=2.0.9
(x_train, y_train), (x_test, y_test) = fashion_mnist.load_data()
x = np.concatenate((x_train, x_test))
y = np.concatenate((y_train, y_test))
x = x.reshape([-1, 28, 28, 1]) / 255.0
print('Fashion MNIST samples', x.shape)
return x, y
def get_fashion_mnist():
(x_train, y_train), (x_test, y_test) = fashion_mnist.load_data()
x_train = x_train.astype(np.float32) / 255
x_test = x_test.astype(np.float32) / 255
x_train = x_train.reshape(-1, 28, 28, 1) * 2. - 1.
x_test = x_test.reshape(-1, 28, 28, 1) * 2. - 1.
return x_train, x_test
def load_fashion_mnist():
(X_train, y_train), (X_test, y_test) = fashion_mnist.load_data()
X_train = normalize_minus1_1(
cast_to_floatx(np.pad(X_train, ((0, 0), (2, 2), (2, 2)), 'constant')))
X_train = np.expand_dims(X_train, axis=get_channels_axis())
X_test = normalize_minus1_1(
cast_to_floatx(np.pad(X_test, ((0, 0), (2, 2), (2, 2)), 'constant')))
X_test = np.expand_dims(X_test, axis=get_channels_axis())
return (X_train, y_train), (X_test, y_test)
def load_fashion_mnist_keras(sparse=False):
(X_train, y_train), (X_test, y_test) = fashion_mnist.load_data()
X_train = X_train.reshape(60000, 28, 28, 1)
X_test = X_test.reshape(10000, 28, 28, 1)
if not sparse:
y_train = to_categorical(y_train)
y_test = to_categorical(y_test)
return X_train, y_train, X_test, y_test