ensor([0.4, 0.01, 0.5, 0.6, 0.2, 0.3, 0.5])
        >>> target = tensor([True, False, False, True, True, False, True])
        >>> r = RetrievalRecallAtFixedPrecision(min_precision=0.8)
        >>> r(preds, target, indexes=indexes)
        (tensor(0.5000), tensor(1))

    Tr!