We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
No module named 'packaging' when install horovod
It seems that the horovod v0.26.0 has some dependency problems.

How long does it take for a new patch version to be released or should I pin the horovod version? ^_^

![image](https://user-images.githubusercontent.com/32220263/195746141-2a0050f5-1eaf-4f7b-9a62-50fd6b13f2ff.png)


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `horovod/__init__.py`
Content:
```
1 from horovod.runner import run
2 
3 __version__ = '0.26.0'
4
```
--- 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()

```

diff --git a/horovod/__init__.py b/horovod/__init__.py
--- a/horovod/__init__.py
+++ b/horovod/__init__.py
@@ -1,3 +1,3 @@
 from horovod.runner import run
 
-__version__ = '0.26.0'
+__version__ = '0.26.1'

{"golden_diff": "diff --git a/horovod/__init__.py b/horovod/__init__.py\n--- a/horovod/__init__.py\n+++ b/horovod/__init__.py\n@@ -1,3 +1,3 @@\n from horovod.runner import run\n \n-__version__ = '0.26.0'\n+__version__ = '0.26.1'\n", "issue": "No module named 'packaging' when install horovod\nIt seems that the horovod v0.26.0 has some dependency problems.\r\n\r\nHow long does it take for a new patch version to be released or should I pin the horovod version? ^_^\r\n\r\n![image](https://user-images.githubusercontent.com/32220263/195746141-2a0050f5-1eaf-4f7b-9a62-50fd6b13f2ff.png)\r\n\n", "before_files": [{"content": "from horovod.runner import run\n\n__version__ = '0.26.0'\n", "path": "horovod/__init__.py"}], "after_files": [{"content": "from horovod.runner import run\n\n__version__ = '0.26.1'\n", "path": "horovod/__init__.py"}]}