def METHOD_NAME(k_params):
    """
    The linear inequality constraint matrix.
    """
    from cvxopt import matrix
    I = np.eye(k_params)  # noqa:E741
    A = np.concatenate((-I, -I), axis=1)
    B = np.concatenate((I, -I), axis=1)
    C = np.concatenate((A, B), axis=0)
    # Return
    return matrix(C)