align ends when inverting transformations for max_horizon #205
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Description
When using
max_horizonthe targets are offset, so for the first date the target at horizon 1 is the value at that date, however for the horizon 2 the target is the value at the second date and so on. The differences inverse transformation for the fitted values assumes that the serie that we're inverse transforming ends at the same period as the original one. This PR ensures that this transformation is done correctly.Checklist: