import json if __name__ == '__main__': path = '../datasets/lvis/annotations/lvis_v1_minival.json' with open(path, 'r') as f: data = json.load(f) for anno in data['annotations']: anno['category_id'] = 1 with open('../datasets/lvis/annotations/lvis_v1_minival_sc.json', 'w') as f: json.dump(data, f)