added figures
compute Z
Merge branch 'master' of github.com:PRMLiA/taichi
walsh basis
anti ferro
Ising
utils
a buf fix in binary_expression and intro of logSumExp
several critical bug fixes
removed Ising
some improvements
deleted nprbm.py
deleted nprbm.py
Merge branch 'master' of github.com:PRMLiA/taichi

Conflicts:
	Ising/FT.plt
	Ising/HopfiledNet_p2_3.py
	Ising/Ising.py
Merge branch 'master' of github.com:qqm377p9k2/PML