InvalidArgumentError: Received a label value of 12 which is outside the valid range of [0, 10).

报错如下

Train on 22824 samples, validate on 5706 samples
Epoch 1/20
---------------------------------------------------------------------------
InvalidArgumentError                      Traceback (most recent call last)
<ipython-input-19-46e26c3fe07c> in <module>
      4 
      5 history = model.fit(train_images, train_labels, epochs=20, 
----> 6                     validation_data=(test_images, test_labels))

e:\python37\lib\site-packages\tensorflow\python\keras\engine\training.py in fit(self, x, y, batch_size, epochs, verbose, callbacks, validation_split, validation_data, shuffle, class_weight, sample_weight, initial_epoch, steps_per_epoch, validation_steps, max_queue_size, workers, use_multiprocessing, **kwargs)
    878           initial_epoch=initial_epoch,
    879           steps_per_epoch=steps_per_epoch,
-->