Hi,
Thanks for the quick response! I wrote the code based on the example:
from bokeh.models import VeeHead
ml = p.multi_line(xs='xs', ys='ys', color='black', source=dataSource)
ml.add_decoration(VeeHead(size=10), "end")
The good thing is the code does not throw any exception, but it does not draw arrow heads. So, I am guessing the functionality exists but its not implemented yet. Lets hope it will be in near future!
Anyways for the time being, I can just use more multi_line
to draw my arrow heads.