After using visdom, the following problem occurs.

requests.exceptions.ConnectionError: HTTPConnectionPool(host=’localhost’, port=8097): Max retries exceeded with url: /env/main (Caused by NewConnectionError(‘<urllib3.connection.HTTPConnection object at 0x0000027F8769B7F0>: Failed to establish a new connection: [WinError 10061] Unable to connect due to aggressive rejection by the target computer.’))
[WinError 10061] Unable to connect because the target computer is actively rejecting.
Visdom python client failed to establish socket to get messages from the server. This feature is optional and can be disabled by initializing Visdom with `use_incoming_socket=False`, which will prevent waiting for this request to timeout.
Setting up a new session…

visdom The above problem will also occur if it is not started.
Solution.

python -m visdom.server