Returns an instance of Bayesian Model.

def get_model(self):
        """
        Returns an instance of Bayesian Model.
        """
        model = BayesianModel()
        model.add_nodes_from(self.variables)
        model.add_edges_from(self.edges)
        model.name = self.model_name

        tabular_cpds = []
        for var, values in self.variable_CPD.items():
            evidence = values['CONDSET'] if 'CONDSET' in values else []
            cpd = values['DPIS']
            evidence_card = values['CARDINALITY'] if 'CARDINALITY' in values else []
            states = self.variables[var]['STATES']
            cpd = TabularCPD(var, len(states), cpd,
                             evidence=evidence,
                             evidence_card=evidence_card)
            tabular_cpds.append(cpd)

        model.add_cpds(*tabular_cpds)

        if nx.__version__.startswith('1'):
            for var, properties in self.variables.items():
                model.node[var] = properties
        else:
            for var, properties in self.variables.items():
                model._node[var] = properties

        return model