[timeseries] add RMSLE to metrics #3938
Merged
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Issue #, if available:
#3878
Description of changes:
RMSLE is a forecast error metric popular with some Kaggle competitions, that is specifically insensitive to effects of scale and trends and has an asymmetric penalty for overprediction. For example, the "getting started" Sales Prediction competition uses RMSLE. This PR includes RMSLE to AG-TS.
Discussion points:
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