BokehScheduler未使用这些版本：
bokeh==0.12.6
dask==0.15.0
distributed==1.17.0
tornado==4.4.0
此设置在Windows 7上完美运行，在虚拟环境中具有相同的软件包和版本。
错误：
distributed.scheduler - INFO - Could not launch service: ('bokeh', 8787)
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/distributed/scheduler.py", line 404, in start_services
service = v(self, io_loop=self.loop)
File "/usr/lib/python2.7/site-packages/distributed/bokeh/scheduler.py", line 995, in __init__
scheduler)))
File "/usr/lib/python2.7/site-packages/bokeh/application/handlers/function.py", line 11, in __init__
_check_callback(func, ('doc',))
File "/usr/lib/python2.7/site-packages/bokeh/util/callback_manager.py", line 12, in _check_callback
sig = signature(callback)
File "/usr/lib/python2.7/site-packages/bokeh/util/future.py", line 85, in signature
for name in func.keywords.keys():
AttributeError: 'NoneType' object has no attribute 'keys'
这一直在下面的包中进行：
Bokeh==0.12.5
dask==0.14.3
distributed==1.16.3
tornado==4.4.0