Original graph construction information:
                    ** 9 entities extracted **
                        - paper entity: 1
                        - method entity: 4
                        - problem entity: 2
                        - domain entity: 2
                    ** 10 relations extracted **
                    ** Graph optimization status: Failed **
                    ** Checked the graph **
                        - removed duplicates
                        - aligned the entity names in the entity list and the relation list
                        - removed discrete entities