MAPE (Mean Absolute Percentage Error)
SMAPE (Symmetric Mean Absolute Percentage Error)
both are sensitive when the TRUE values is 0.
Thus I've come to the conclusion to add some
epsilon to all data points to eliminate having zero in determinator.
But after that, I put attention that the resulting
MAPE significantly depends on such
For example, if I choose $\epsilon=0.1$ the
MAPE is much lower, than if I choose $\epsilon=0.01$.
What should be done?