The measuring unit of MSE in utils.py

[guoyage]

Hello, I have the confusion about RMSE. First of all, the RMSE calculation of the Polar model in the code is performed in the polar coordinate system, which brings about the first problem: in the polar coordinate system, the dimensions of radius and angle are not the same, and the two dimensions are different. Is it reasonable to add the values directly? Secondly, I tried to convert the predicted trajectory from the polar coordinate system to the Cartesian coordinate system. At this time, I found that the RMSE in the Cartesian coordinate system would increase, which brought about the second confusion: the difference between Polar and Cartesian coordinates. Is the RMSE comparison fair at this time? Very much looking forward to your reply.