Hard code for saving path

[zhoupancake]

Hello! Thanks for your excellent job!
I found some trouble when using this project, it's not a bug, just something can be better.
When using ns-train to modeling, we can designate expected output directory. But there will be several folders named experiment_name, method_name and timestamp created following the designated path. If I rename or move the 'timestamp' folder, it will appear that project cannot find the trained model when I use ns-viewer or ns-export commands even the config path is required.
I guess that it might cause by the hard code mode when reading the .ckpt file. When I try to input the .ckpt path, there is no way for me to do so. So, is it possible to search for the .ckpt file by relative path or proving the path by user? I don't want to modify the path in the config file for I use the 'pip' package.
Please, please, please.