Testing tensorflow < 2 installation

mnist_cnn_tf_sample.py

'''Trains a simple convnet on the MNIST dataset.
Gets to 99.25% test accuracy after 12 epochs
(there is still a lot of margin for parameter tuning).
16 seconds per epoch on a GRID K520 GPU.
'''

#from __future__ import print_function
from tensorflow import keras as K
# from keras.datasets import mnist
# from keras.models import Sequential
# from keras.layers import Dense, Dropout, Flatten
# from keras.layers import Conv2D, MaxPooling2D
# from keras import backend as K

batch_size = 128
num_classes = 10
epochs = 12

# input image dimensions
img_rows, img_cols = 28, 28

# the data, split between train and test sets
(x_train, y_train), (x_test, y_test) = K.datasets.mnist.load_data()

# if K.image_data_format() == 'channels_first':
#     x_train = x_train.reshape(x_train.shape[0], 1, img_rows, img_cols)
#     x_test = x_test.reshape(x_test.shape[0], 1, img_rows, img_cols)
#     input_shape = (1, img_rows, img_cols)
# else:
#     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.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
print('x_train shape:', x_train.shape)
print(x_train.shape[0], 'train samples')
print(x_test.shape[0], 'test samples')

# convert class vectors to binary class matrices
y_train = K.utils.to_categorical(y_train, num_classes)
y_test = K.utils.to_categorical(y_test, num_classes)

model = K.models.Sequential()
model.add(K.layers.Conv2D(32, kernel_size=(3, 3),
                 activation='relu',
                 input_shape=input_shape))
model.add(K.layers.Conv2D(64, (3, 3), activation='relu'))
model.add(K.layers.MaxPooling2D(pool_size=(2, 2)))
model.add(K.layers.Dropout(0.25))
model.add(K.layers.Flatten())
model.add(K.layers.Dense(128, activation='relu'))
model.add(K.layers.Dropout(0.5))
model.add(K.layers.Dense(num_classes, activation='softmax'))

model.compile(loss=K.losses.categorical_crossentropy,
              optimizer=K.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])