I need to run the demo of tihs code

[bilibilicharger]

Could you tell me how to prepare the date ? I change the root of the dataset,and get a wrong info:
assert os.path.exists(self.root_path), (f'Invalid path: {self.root_path}')
AssertionError: Invalid path: /media/ljq/software/shy/kitti/KITTI Semantic/SemanticKITTI/process/KITTI/dataset
Please teach me