Fixes bug in repetitive calling of GibbsSampling.sample
Fixes bug in repetitive calling of GibbsSampling.sample

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