adds cardinality method to get the cardinality of variables
adds cardinality method to get the cardinality of variables

yashu-seth/pgmpy,pratyakshs/pgmpy,ankurankan/pgmpy,kislayabhi/pgmpy,liquidmetal/pgmpy,jhonatanoliveira/pgmpy,khalibartan/pgmpy,yashu-seth/pgmpy,liquidmetal/pgmpy,pgmpy/pgmpy,kris-singh/pgmpy,anaviltripathi/pgmpy,pratyakshs/pgmpy,vivek425ster/pgmpy,kislayabhi/pgmpy,abinashpanda/pgmpy,sandeepkrjha/pgmpy,khalibartan/pgmpy,palashahuja/pgmpy,anaviltripathi/pgmpy,abinashpanda/pgmpy,palashahuja/pgmpy,ankurankan/pgmpy,jhonatanoliveira/pgmpy,vivek425ster/pgmpy,sandeepkrjha/pgmpy,kris-singh/pgmpy,pgmpy/pgmpy