An error is reported when training RobotCar Loop：numpy.linalg.LinAlgError: Eigenvalues did not converge

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Hi and thanks for your work. When I'm going to train RobotCar Loop, I encountered the following error, I'm very distressed, do you know what's going on? I am using the same dataset as in your paper. I would be very grateful if you could answer.

numpy.linalg.LinAlgError: Eigenvalues did not converge