izing linear operator input vector if True.
compute_w : bool, optional
    Request a norm-maximizing linear operator output vector if True.

Returns
-------
est : float
    An underestimate of the 1-norm of the sparse matrix.
v : ndarray, optional
    The vector such that ||Av||_1 == est*||v||_1.
    It can be thought of as an input to the linear operator
    that gives an output with particularly large norm.
w : ndarray, optional
    The vector Av which has relatively large 1-norm.
    It can be thought of as an output of the linear operator
    that is relatively large in norm compared to the input.

)