Source code for cr.sparse._src.lop.props

# Copyright 2021 CR-Suite Development Team
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import jax.numpy as jnp

from .util import to_matrix

def upper_frame_bound(T):
    """Computes the upper frame bound for a linear operator using full SVD
    """
    A = to_matrix(T)
    s = jnp.linalg.svd(A, False, False)
    return s[0]