naryConfusionMatrix
        >>> target = torch.tensor([1, 1, 0, 0])
        >>> preds = torch.tensor([0.35, 0.85, 0.48, 0.01])
        >>> bcm = BinaryConfusionMatrix()
        >>> bcm(preds, target)
        tensor([[2, 0],
                [1, 1]])

    F