There isn't same category between the dataset for network pre-training and the dataset for detector learning

[little-spoon]

Hello, I have a question:
If there is no same category between the dataset for network pre-training and the dataset for detector learning, is the method in the paper useless?

你好，我有一个问题：
如果用于网络预训练的数据集和用于检测器学习的数据集之间没有相同的类别，文章中的方法还有用吗？