Export fine-tuned BERT Model trained on Cloud TPU to HDF5 format

I’m using Colab environment to fine-tune a BERT Model (for
reference this is the
Notebook_with_Cloud_TPU_Sentence_Classification_Tasks.ipynb)).
How can I export fine tuned model (it’s a TPUEstimator object) to
HDF5 format? I need to use the trained model locally on CPU.