* [TPU] Doc, fix xla_spawn.py, only preprocess dataset once * Update examples/README.md * [xla_spawn] Add `_mp_fn` to other Trainer scripts * [TPU] Fix: eval dataloader was None
* Created using Colaboratory * [examples] reorganize files * remove run_tpu_glue.py as superseded by TPU support in Trainer * Bugfix: int, not tuple * move files around