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* Merged commit includes the following changes:
263863588  by yongzhe:

    Fix a bug that the SetExternalContext for EdgeTPU wasn't called when initializing LSTD client.

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263370193  by yongzhe:

    Internal change.

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PiperOrigin-RevId: 263863588

* Revert changes in seq_dataset_builder_test.py

* Remove stale code