added sample_discrete function
added sample_discrete function

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