python dqn.py
The problem is that windows doesn't allow "?" in filenames. But Visdom library contains this problem.
A quick fix for windows users would be to delete the corresponding entry in ext_files in server.py
%sfonts/glyphicons-halflings-regular.eot?#iefix' % bb:
'glyphicons-halflings-regular.eot?#iefix',
(lines 568-569)
python -m visdom.server
See the result : URL