Import py27-nfg-0.1.2 as wip/py-ngf.

PyNFG is designed to make it easy for researchers to model strategic
environments using the Network Form Game (NFG) formalism developed by David
Wolpert with contributions from Ritchie Lee, James Bono and others. The main
idea of the NFG framework is to translate a strategic environment into the
language of probabilistic graphical models. The result is a more intuitive,
powerful, and user-friendly framework than the extensive form
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