Added multivariate grouper and tests #432
Merged
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Description of changes:
This is the first pull request of bringing the GP Copula model to GluonTS master.
This PR implements the multivariate grouper which allows the use of univariate datasets in the multivariate setting. It groups the univariate dataset into a multivariate dataset consisting of one multivariate time series (and performs alignments where necessary). It also supports rolling evaluation scenarios in the test dataset.
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