Github user ProtD commented on the issue:
    @srowen It worked in v2.0, but was broken probably in v2.2.0 by 
b3d39620c563e5f6a32a4082aa3908e1009c17d2. Current unit tests check writing only 
for dataframes which were previously read from a LibSVM format, not general 
ones. (And I guess people don't write LibSVMs very often - that may be why 
nobody has reported it.)
    @WeichenXu123 Yes, good idea, will do it!

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