prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  ParamScheduler docs missing
  No docs on `ParamScheduler` and related classes on the [site](https://pytorch.org/ignite/contrib/handlers.html).
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `ignite/contrib/handlers/__init__.py`
  Content:
  ```
  1 
  2 from ignite.contrib.handlers.param_scheduler import ParamScheduler, CyclicalScheduler, \
  3     LinearCyclicalScheduler, CosineAnnealingScheduler
  4 
  5 from ignite.contrib.handlers.tqdm_logger import ProgressBar
  6 
  7 __all__ = ['ProgressBar']
  8
  ```
  
  Path: `ignite/contrib/engines/__init__.py`
  Content:
  ```
  1 # coding: utf-8
  2 
  3 from ignite.contrib.engines.tbptt import create_supervised_tbptt_trainer
  4 from ignite.contrib.engines.tbptt import Tbptt_Events
  5 
  6 
  7 __all__ = ["create_supervised_tbptt_trainer", "Tbptt_Events"]
  8
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/ignite/contrib/engines/__init__.py b/ignite/contrib/engines/__init__.py
  --- a/ignite/contrib/engines/__init__.py
  +++ b/ignite/contrib/engines/__init__.py
  @@ -2,6 +2,3 @@
   
   from ignite.contrib.engines.tbptt import create_supervised_tbptt_trainer
   from ignite.contrib.engines.tbptt import Tbptt_Events
  -
  -
  -__all__ = ["create_supervised_tbptt_trainer", "Tbptt_Events"]
  diff --git a/ignite/contrib/handlers/__init__.py b/ignite/contrib/handlers/__init__.py
  --- a/ignite/contrib/handlers/__init__.py
  +++ b/ignite/contrib/handlers/__init__.py
  @@ -3,5 +3,3 @@
       LinearCyclicalScheduler, CosineAnnealingScheduler
   
   from ignite.contrib.handlers.tqdm_logger import ProgressBar
  -
  -__all__ = ['ProgressBar']
  
verification_info: {"golden_diff": "diff --git a/ignite/contrib/engines/__init__.py b/ignite/contrib/engines/__init__.py\n--- a/ignite/contrib/engines/__init__.py\n+++ b/ignite/contrib/engines/__init__.py\n@@ -2,6 +2,3 @@\n \n from ignite.contrib.engines.tbptt import create_supervised_tbptt_trainer\n from ignite.contrib.engines.tbptt import Tbptt_Events\n-\n-\n-__all__ = [\"create_supervised_tbptt_trainer\", \"Tbptt_Events\"]\ndiff --git a/ignite/contrib/handlers/__init__.py b/ignite/contrib/handlers/__init__.py\n--- a/ignite/contrib/handlers/__init__.py\n+++ b/ignite/contrib/handlers/__init__.py\n@@ -3,5 +3,3 @@\n     LinearCyclicalScheduler, CosineAnnealingScheduler\n \n from ignite.contrib.handlers.tqdm_logger import ProgressBar\n-\n-__all__ = ['ProgressBar']\n", "issue": "ParamScheduler docs missing\nNo docs on `ParamScheduler` and related classes on the [site](https://pytorch.org/ignite/contrib/handlers.html).\n", "before_files": [{"content": "\nfrom ignite.contrib.handlers.param_scheduler import ParamScheduler, CyclicalScheduler, \\\n    LinearCyclicalScheduler, CosineAnnealingScheduler\n\nfrom ignite.contrib.handlers.tqdm_logger import ProgressBar\n\n__all__ = ['ProgressBar']\n", "path": "ignite/contrib/handlers/__init__.py"}, {"content": "# coding: utf-8\n\nfrom ignite.contrib.engines.tbptt import create_supervised_tbptt_trainer\nfrom ignite.contrib.engines.tbptt import Tbptt_Events\n\n\n__all__ = [\"create_supervised_tbptt_trainer\", \"Tbptt_Events\"]\n", "path": "ignite/contrib/engines/__init__.py"}], "after_files": [{"content": "\nfrom ignite.contrib.handlers.param_scheduler import ParamScheduler, CyclicalScheduler, \\\n    LinearCyclicalScheduler, CosineAnnealingScheduler\n\nfrom ignite.contrib.handlers.tqdm_logger import ProgressBar\n", "path": "ignite/contrib/handlers/__init__.py"}, {"content": "# coding: utf-8\n\nfrom ignite.contrib.engines.tbptt import create_supervised_tbptt_trainer\nfrom ignite.contrib.engines.tbptt import Tbptt_Events\n", "path": "ignite/contrib/engines/__init__.py"}]}