Source code for netket.utils.static_number
# Copyright 2023 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 numbers import Number
import jax
import jax.numpy as jnp
import numpy as np
from . import struct
from .types import DType
[docs]
@struct.dataclass
class StaticZero(Number):
"""
A static representation of 0, which can be used in Jax and attempts to behave like
a normal jax array.
Used to be able to test for hard-zeros in jax code
"""
dtype: DType = struct.field(pytree_node=False, default=bool)
shape = property(lambda _: ())
ndim = property(lambda _: 0)
weak_dtype = property(lambda _: True)
aval = property(lambda self: jax.ShapeDtypeStruct(self.shape, self.dtype))
__add__ = lambda self, o: self if isinstance(o, StaticZero) else o
__radd__ = lambda self, o: self if isinstance(o, StaticZero) else o
__sub__ = lambda self, o: self if isinstance(o, StaticZero) else -o
__rsub__ = lambda self, o: self if isinstance(o, StaticZero) else o
__mul__ = lambda self, o: self
__rmul__ = lambda self, o: self
__neg__ = lambda self: self
__bool__ = lambda self: False
__eq__ = lambda self, o: True if isinstance(o, StaticZero) else False
astype = lambda self, dtype: StaticZero(dtype)
def __array__(self, dtype=None):
if dtype is None:
dtype = self.dtype
return np.zeros(self.shape, dtype=dtype)
def __jax_array__(self, dtype=None):
if dtype is None:
dtype = self.dtype
return jnp.zeros(self.shape, dtype=dtype)