>>> from torchmetrics.regression import R2Score
         >>> target = torch.tensor([[0.5, 1], [-1, 1], [7, -6]])
         >>> preds = torch.tensor([[0, 2], [-1, 2], [8, -5]])
         >>> r2score = MultioutputWrapper(R2Score(), 2)
         >>> r2score(preds, target)
         tensor([0.9654, 0.9082])

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