Raise clear error when gridsearch() receives multiple TimeSeries - #3191
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Raise clear error when gridsearch() receives multiple TimeSeries#3191COMPUMAX-EC wants to merge 2 commits into
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`gridsearch()` only supports a single TimeSeries for `series`, `val_series`, `past_covariates`, and `future_covariates`. Passing a sequence of TimeSeries previously failed deep in the call stack with a cryptic error (e.g. "The two TimeSeries sequences must have the same length"), making the actual problem hard to diagnose. Fixes unit8co#1622
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Fixes #1622
gridsearch()only supports a singleTimeSeriesforseries,val_series,past_covariates, andfuture_covariates. Passing a sequence ofTimeSeriespreviously failed deep in the call stack with a cryptic error (e.g."The two TimeSeries sequences must have the same length"), instead of a clear message at the point of the mistake.This adds an early validation check using the existing
get_series_seq_typehelper, raising aValueErrorthat names the offending argument, plus a parametrized test covering all four arguments.