Who did Keanu Reeves play in the movie The Matrix?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q15632617', 'id': 0, 'label': 'fictional human'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q43416', 'id': 1, 'label': 'Keanu Reeves'}, {'type': 'INTERNAL', 'name_': 'Q20019907', 'id': 2, 'label': 'Matrix universe'}, {'type': 'INTERNAL', 'name_': 'Q207536', 'id': 3, 'label': 'The Matrix Revolutions'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q83495', 'id': 4, 'label': 'The Matrix'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q5668075', 'id': 5, 'label': 'Tank'}, {'type': 'INTERNAL', 'name_': 'Q64417139', 'id': 6, 'label': 'John Wick'}], 'links': [{'name_': 'P161', 'source': 3, 'target': 1, 'label': 'cast member'}, {'name_': 'P1434', 'source': 3, 'target': 2, 'label': 'takes place in fictional universe'}, {'name_': 'P144', 'source': 3, 'target': 4, 'label': 'based on'}, {'name_': 'P31', 'source': 5, 'target': 0, 'label': 'instance of'}, {'name_': 'P1080', 'source': 5, 'target': 2, 'label': 'from narrative universe'}, {'name_': 'P1441', 'source': 5, 'target': 4, 'label': 'present in work'}, {'name_': 'P31', 'source': 6, 'target': 0, 'label': 'instance of'}, {'name_': 'P175', 'source': 6, 'target': 1, 'label': 'performer'}]}