the visdom cant run. and when i train the ssd,the erroe as follow:

[henbucuoshanghai]

/lib/python3.6/site-packages/requests/adapters.py", line 516, in send raise ConnectionError(e, request=request) requests.exceptions.ConnectionError: HTTPConnectionPool(host='localhost', port=8097): Max retries exceeded with url: /update (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fadec7485f8>: Failed to establish a new connection: [Errno 111] Connection refused',))

[JaryHuang]

please pip install visdom. if you don't install visdom, the trainning always can be success, but in the trainning, every step will pull this warnning