man_corrcoef(preds, target)
        tensor(1.0000)

    Example (multi output regression):
        >>> from torchmetrics.functional.regression import spearman_corrcoef
        >>> target = torch.tensor([[3, -0.5], [2, 7]])
        >>> preds = torch.tensor([[2.5, 0.0], [2, 8]])
        >>> spearman_corrcoef(preds, target)
        tensor([1.0000, 1.0000])

    r	