STEPS = 1000

print("Keras: Flow")

datagen = ImageDataGenerator()

start_time = time.time()

datagen.fit(X_train)
train_generator = datagen.flow(X_train, Y_train, batch_size=32)

print("PRE-TIME (fit)", time.time() - start_time)

start_time = time.time()

step = 0
for x_batch, y_batch in train_generator:
    step += 1
    if step > STEPS: break

print("TIME", time.time() - start_time)

curr_mem = psutil.virtual_memory().used
print("Memory Used: %.2f GB" % ((curr_mem - start_mem) / GB))

# Release unused memory
gc.collect()
time.sleep(5)