flip_vert.py

# Flip images vertically
datagen = ImageDataGenerator(vertical_flip=True)

# fit parameters from data
datagen.fit(x_train)

# Configure batch size and retrieve one batch of images
for X_batch, y_batch in datagen.flow(x_train, y_train, batch_size=9):
    # Show 9 images
    for i in range(0, 9):
        pyplot.subplot(330 + 1 + i)
        pyplot.imshow(X_batch[i].reshape(img_rows, img_cols, 3))
    # show the plot
    pyplot.show()
    break