在请问下，为何我这边的次数是你的一半（我这边是 727，你的是 1454），一样的代码，还有有个 warning 信息能帮忙看看是啥意思吗？
Epoch 2/10
Corrupt JPEG data: 1403 extraneous bytes before marker 0xd9
Corrupt JPEG data: 65 extraneous bytes before marker 0xd9
Corrupt JPEG data: 239 extraneous bytes before marker 0xd9
Corrupt JPEG data: 228 extraneous bytes before marker 0xd9
Corrupt JPEG data: 128 extraneous bytes before marker 0xd9
Corrupt JPEG data: 214 extraneous bytes before marker 0xd9
Corrupt JPEG data: 162 extraneous bytes before marker 0xd9
Corrupt JPEG data: 99 extraneous bytes before marker 0xd9
Warning: unknown JFIF revision number 0.00
Corrupt JPEG data: 396 extraneous bytes before marker 0xd9
Corrupt JPEG data: 252 extraneous bytes before marker 0xd9
Corrupt JPEG data: 2226 extraneous bytes before marker 0xd9
Corrupt JPEG data: 1153 extraneous bytes before marker 0xd9
727/727 - 31s - loss: 0.6006 - sparse_categorical_accuracy: 0.6799