adds get_cardinality method in BayesianModel class
adds get_cardinality method in BayesianModel class

pgmpy/pgmpy,kris-singh/pgmpy,ankurankan/pgmpy,abinashpanda/pgmpy,pgmpy/pgmpy,kris-singh/pgmpy,sandeepkrjha/pgmpy,khalibartan/pgmpy,ankurankan/pgmpy,jhonatanoliveira/pgmpy,jhonatanoliveira/pgmpy,khalibartan/pgmpy,abinashpanda/pgmpy,sandeepkrjha/pgmpy