Remove AcceleratorConnector.devices (#12435)

CHANGELOG.md

@@ -792,6 +792,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Removed `AcceleratorConnector.parallel_device_ids` property ([#12072](https://github.com/PyTorchLightning/pytorch-lightning/pull/12072))
 
 
+- Removed `AcceleratorConnector.devices` property ([#12435](https://github.com/PyTorchLightning/pytorch-lightning/pull/12435))
+
+
 ### Fixed
 
 - Fixed an issue where `ModelCheckpoint` could delete older checkpoints when `dirpath` has changed during resumed training ([#12045](https://github.com/PyTorchLightning/pytorch-lightning/pull/12045))

pytorch_lightning/trainer/connectors/accelerator_connector.py

@@ -59,7 +59,6 @@ from pytorch_lightning.strategies import (
     DeepSpeedStrategy,
     HorovodStrategy,
     IPUStrategy,
-    ParallelStrategy,
     SingleDeviceStrategy,
     SingleTPUStrategy,
     Strategy,
@@ -780,14 +779,6 @@ class AcceleratorConnector:
     def parallel_devices(self) -> List[Union[torch.device, int]]:
         return self._parallel_devices
 
-    @property
-    def devices(self) -> int:
-        if isinstance(self.strategy, SingleDeviceStrategy):
-            return 1
-        elif isinstance(self.strategy, ParallelStrategy):
-            return len(self.strategy.parallel_devices)
-        return 0
-
     @property
     def tpu_cores(self) -> Optional[Union[List[int], int]]:
         if isinstance(self.accelerator, TPUAccelerator):