# Copyright 2021 The NetKet Authors - All rights reserved.
#
# 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
#
#    http://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.

from typing import Callable, Optional, Union, Tuple, Any
from functools import partial

import jax
import flax
from jax import numpy as jnp
from flax import struct

Ndarray = Any


@struct.dataclass
class SR:
    """
    Base class holding the parameters for the way to find the solution to
    (S + I*diag_shift) / F.
    """

    diag_shift: float = 0.01
    """Diagonal shift added to the S matrix."""
