- MultiSegmentFetcher.__len__: min([]) → 加空检查返回 0 - BaseDataset.get_index: assert 替换为 RuntimeError / ValueError - BaseDataset.__len__: assert 替换为 early return 0
- MultiSegmentFetcher.__len__: min([]) → 加空检查返回 0 - BaseDataset.get_index: assert 替换为 RuntimeError / ValueError - BaseDataset.__len__: assert 替换为 early return 0