About the log(Ls) in Table 2

So sorry to bother you . I have a little bit of trouble calculating the log(Ls) of various methods in Table 2. The logarithm of the loss with covariance matrix is always negative, and the absolute value is greatly different from the paper. Would it be possible for you to share the evaluation code you used to computer the log(Ls) in the Table 2? Thank you very much for your help.