Is it possible that the reason for the faster training speed of this tensorflow model on Google Colab (400 --> 10 seconds per epoch) is due to this?

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It is possible that the faster training speed of the TensorFlow model on Google Colab could be due to various factors such as the optimization of the code, the performance of the hardware used by Colab, or the specific configuration and settings of Colab. However, it is not clear from the given information what specific factor may be responsible for the faster training speed.