ValueError: __len__() should return >= 0

[Doflamingo-swj]

Hello, thank you for your reply! I ran into a problem while trying to run your code:

Specifically, in the CL-SLAM/slam/slam.py file, there is a code that returns the instance size:
return len(self.online_dataset), every time you run here, an error will be reported ValueError: len() should return >= 0.

I used KITTI's sequence 9 to run main_adapt.py. Is there any problem in the data set preparation stage? According to my observation, the online_dataset instance does not have a customized member function of len(). What do you want to return here?