#!/usr/bin/env python
# coding: utf-8

# multi-label classification
# https://people.iee.ihu.gr/~stoug/odep/papers/Multi-Label%20Classification:%20An%20Overview.pdf
# https://arxiv.org/abs/1508.01991

# In[ ]:


ordinal regression
http://www.wsdm-conference.org/2010/proceedings/docs/p151.pdf
https://kentonmurray.com/www2014.cobafi.pdf