当我训练我的神经网络时，在第 8 个时期验证准确性突然下降，这意味着什么？
Train for 281 steps, validate for 24 steps
Epoch 1/10
281/281 [==============================] - 106s 378ms/step - loss: 1.5758 - accuracy: 0.8089 - val_loss: 1.8909 - val_accuracy: 0.4766
Epoch 2/10
281/281 [==============================] - 99s 353ms/step - loss: 1.5057 - accuracy: 0.8715 - val_loss: 1.7364 - val_accuracy: 0.6276
Epoch 3/10
281/281 [==============================] - 99s 353ms/step - loss: 1.4829 - accuracy: 0.8929 - val_loss: 1.5347 - val_accuracy: 0.8398
Epoch 4/10
281/281 [==============================] - 99s 353ms/step - loss: 1.4445 - accuracy: …