changelog + update docstring

CHANGELOG.md

@@ -336,6 +336,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Removed deprecated properties `DeepSpeedPlugin.cpu_offload*` in favor of `offload_optimizer`, `offload_parameters` and `pin_memory` ([#9244](https://github.com/PyTorchLightning/pytorch-lightning/pull/9244))
 
 
+- Removed `call_configure_sharded_model_hook` property from `Accelerator` and `TrainingTypePlugin` ([#9612](https://github.com/PyTorchLightning/pytorch-lightning/pull/9612))
+
+
 ### Fixed
 
 

pytorch_lightning/core/hooks.py

@@ -297,12 +297,8 @@ def configure_sharded_model(self) -> None:
         where we'd like to shard the model instantly, which is useful for extremely large models which can save
         memory and initialization time.
 
-        The accelerator manages whether to call this hook at every given stage.
-        For sharded plugins where model parallelism is required, the hook is usually on called once
-        to initialize the sharded parameters, and not called again in the same process.
-
-        By default for accelerators/plugins that do not use model sharding techniques,
-        this hook is called during each fit/val/test/predict stages.
+        This hook is called during each of fit/val/test/predict stages in the same process, so ensure that
+        implementation of this hook is idempotent.
         """