How many movies has James Cameron directed?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q6173448', 'id': 0, 'label': 'Wikipedia:Vital articles/Level/4'}, {'type': 'INTERNAL', 'name_': 'Q1860', 'id': 1, 'label': 'English'}, {'type': 'INTERNAL', 'name_': 'Q1406', 'id': 2, 'label': 'Microsoft Windows'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q42574', 'id': 3, 'label': 'James Cameron'}, {'type': 'INTERNAL', 'name_': 'Q103569', 'id': 4, 'label': 'Alien'}, {'type': 'INTERNAL', 'name_': 'Q97658680', 'id': 5, 'label': "Plato's Atlantis"}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q336517', 'id': 6, 'label': 'The Abyss'}, {'type': 'INTERNAL', 'name_': 'Q113714725', 'id': 7, 'label': 'The Abyss: Incident at Europa'}], 'links': [{'name_': 'P5008', 'source': 1, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P5008', 'source': 2, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P5008', 'source': 3, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P1412', 'source': 3, 'target': 1, 'label': 'languages spoken, written or signed'}, {'name_': 'P364', 'source': 4, 'target': 1, 'label': 'original language of performance work'}, {'name_': 'P8371', 'source': 5, 'target': 4, 'label': 'references work, tradition or theory'}, {'name_': 'P8371', 'source': 5, 'target': 6, 'label': 'references work, tradition or theory'}, {'name_': 'P400', 'source': 7, 'target': 2, 'label': 'platform'}, {'name_': 'P144', 'source': 7, 'target': 6, 'label': 'based on'}]}