* tpu device check
* replaced with xmp spawn
* Revert "replaced with xmp spawn"
This reverts commit 6835380f
* replaced all instances of XLA_AVAILABLE
* moved inner_f to global scope
* made refactors
* added changelog
* added TPU_AVAILABLE variable
* fix codefactor issues
* removed form trainer and early stopping
* add TORCHXLA_AVAILABLE check
* added tests
* refactoring
* Update pytorch_lightning/utilities/xla_device_utils.py
Co-authored-by: Adrian Wälchli <aedu.waelchli@gmail.com>
* updated function names
* fixed bug
* updated CHANGELOG.md
* added todo
* added type hints
* isort and black
Co-authored-by: Adrian Wälchli <aedu.waelchli@gmail.com>
Co-authored-by: William Falcon <waf2107@columbia.edu>
Lezwon Castelino