Update CHANGELOG.md

Author: ananthsub

CHANGELOG.md

@@ -98,6 +98,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Added a `_Stateful` support for `LightningDataModule` ([#11637](https://github.com/PyTorchLightning/pytorch-lightning/pull/11637))
 
 
+- Added checks to `TPUAccelerator.setup_environment` to assert device availability ([#11799](https://github.com/PyTorchLightning/pytorch-lightning/pull/11799))
+
+
 ### Changed
 
 - Implemented a new native and rich format in `_print_results` method of the `EvaluationLoop` ([#11332](https://github.com/PyTorchLightning/pytorch-lightning/pull/11332))

pytorch_lightning/accelerators/tpu.py

@@ -26,7 +26,7 @@
 class TPUAccelerator(Accelerator):
     """Accelerator for TPU devices."""
 
-    def setup_environment(self, root_device: torch.device) -> None:
+    def __init__(self) -> None:
         """
         Raises:
             MisconfigurationException: