tensormaker
Base classes with various utilities for creating tensors.
TensorMakerMixin
¶
Source code in evotorch/tools/tensormaker.py
class TensorMakerMixin:
def __get_dtype_and_device_kwargs(
self,
*,
dtype: Optional[DType],
device: Optional[Device],
use_eval_dtype: bool,
out: Optional[Iterable],
) > dict:
result = {}
if out is None:
if dtype is None:
if use_eval_dtype:
if hasattr(self, "eval_dtype"):
result["dtype"] = self.eval_dtype
else:
raise AttributeError(
f"Received `use_eval_dtype` as {repr(use_eval_dtype)}, which represents boolean truth."
f" However, evaluation dtype cannot be determined, because this object does not have"
f" an attribute named `eval_dtype`."
)
else:
result["dtype"] = self.dtype
else:
if use_eval_dtype:
raise ValueError(
f"Received both a `dtype` argument ({repr(dtype)}) and `use_eval_dtype` as True."
f" These arguments are conflicting."
f" Please either provide a `dtype`, or leave `dtype` as None and pass `use_eval_dtype=True`."
)
else:
result["dtype"] = dtype
if device is None:
result["device"] = self.device
else:
result["device"] = device
return result
def __get_size_args(self, *size: Size, num_solutions: Optional[int], out: Optional[Iterable]) > tuple:
if out is None:
nsize = len(size)
if (nsize == 0) and (num_solutions is None):
return tuple()
elif (nsize >= 1) and (num_solutions is None):
return size
elif (nsize == 0) and (num_solutions is not None):
if hasattr(self, "solution_length"):
num_solutions = int(num_solutions)
if self.solution_length is None:
return (num_solutions,)
else:
return (num_solutions, self.solution_length)
else:
raise AttributeError(
f"Received `num_solutions` as {repr(num_solutions)}."
f" However, to determine the target tensor's size via `num_solutions`, this object"
f" needs to have an attribute named `solution_length`, which seems to be missing."
)
else:
raise ValueError(
f"Encountered both `size` arguments ({repr(size)})"
f" and `num_solutions` keyword argument (num_solutions={repr(num_solutions)})."
f" Specifying both `size` and `num_solutions` is not valid."
)
else:
return tuple()
def __get_generator_kwargs(self, *, generator: Any) > dict:
result = {}
if generator is None:
if hasattr(self, "generator"):
result["generator"] = self.generator
else:
result["generator"] = generator
return result
def __get_all_args_for_maker(
self,
*size: Size,
num_solutions: Optional[int],
out: Optional[Iterable],
dtype: Optional[DType],
device: Optional[Device],
use_eval_dtype: bool,
) > tuple:
args = self.__get_size_args(*size, num_solutions=num_solutions, out=out)
kwargs = self.__get_dtype_and_device_kwargs(dtype=dtype, device=device, use_eval_dtype=use_eval_dtype, out=out)
if out is not None:
kwargs["out"] = out
return args, kwargs
def __get_all_args_for_random_maker(
self,
*size: Size,
num_solutions: Optional[int],
out: Optional[Iterable],
dtype: Optional[DType],
device: Optional[Device],
use_eval_dtype: bool,
generator: Any,
):
args = self.__get_size_args(*size, num_solutions=num_solutions, out=out)
kwargs = {}
kwargs.update(
self.__get_dtype_and_device_kwargs(dtype=dtype, device=device, use_eval_dtype=use_eval_dtype, out=out)
)
kwargs.update(self.__get_generator_kwargs(generator=generator))
if out is not None:
kwargs["out"] = out
return args, kwargs
def make_tensor(
self,
data: Any,
*,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
read_only: bool = False,
) > Iterable:
"""
Make a new tensor.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
data: The data to be converted to a tensor.
If one wishes to create a PyTorch tensor, this can be anything
that can be stored by a PyTorch tensor.
If one wishes to create an `ObjectArray` and therefore passes
`dtype=object`, then the provided `data` is expected as an
`Iterable`.
dtype: Optionally a string (e.g. "float32"), or a PyTorch dtype
(e.g. torch.float32), or `object` or "object" (as a string)
or `Any` if one wishes to create an `ObjectArray`.
If `dtype` is not specified it will be assumed that the user
wishes to create a tensor using the dtype of this method's
parent object.
device: The device in which the tensor will be stored.
If `device` is not specified, it will be assumed that the user
wishes to create a tensor on the device of this method's
parent object.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
read_only: Whether or not the created tensor will be readonly.
By default, this is False.
Returns:
A PyTorch tensor or an ObjectArray.
"""
kwargs = self.__get_dtype_and_device_kwargs(dtype=dtype, device=device, use_eval_dtype=use_eval_dtype, out=None)
return misc.make_tensor(data, read_only=read_only, **kwargs)
def make_empty(
self,
*size: Size,
num_solutions: Optional[int] = None,
out: Optional[Iterable] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > Iterable:
"""
Make an empty tensor.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: Shape of the empty tensor to be created.
expected as multiple positional arguments of integers,
or as a single positional argument containing a tuple of
integers.
Note that when the user wishes to create an `ObjectArray`
(i.e. when `dtype` is given as `object`), then the size
is expected as a single integer, or as a singleelement
tuple containing an integer (because `ObjectArray` can only
be onedimensional).
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32) or, for creating an `ObjectArray`,
"object" (as string) or `object` or `Any`.
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The new empty tensor, which can be a PyTorch tensor or an
`ObjectArray`.
"""
args, kwargs = self.__get_all_args_for_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
)
return misc.make_empty(*args, **kwargs)
def make_zeros(
self,
*size: Size,
num_solutions: Optional[int] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > torch.Tensor:
"""
Make a new tensor filled with 0, or fill an existing tensor with 0.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: Size of the new tensor to be filled with 0.
This can be given as multiple positional arguments, each such
positional argument being an integer, or as a single positional
argument of a tuple, the tuple containing multiple integers.
Note that, if the user wishes to fill an existing tensor with
0 values, then no positional argument is expected.
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
out: Optionally, the tensor to be filled by 0 values.
If an `out` tensor is given, then no `size` argument is expected.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The created or modified tensor after placing 0 values.
"""
args, kwargs = self.__get_all_args_for_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
)
return misc.make_zeros(*args, **kwargs)
def make_ones(
self,
*size: Size,
num_solutions: Optional[int] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > torch.Tensor:
"""
Make a new tensor filled with 1, or fill an existing tensor with 1.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: Size of the new tensor to be filled with 1.
This can be given as multiple positional arguments, each such
positional argument being an integer, or as a single positional
argument of a tuple, the tuple containing multiple integers.
Note that, if the user wishes to fill an existing tensor with
1 values, then no positional argument is expected.
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
out: Optionally, the tensor to be filled by 1 values.
If an `out` tensor is given, then no `size` argument is expected.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The created or modified tensor after placing 1 values.
"""
args, kwargs = self.__get_all_args_for_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
)
return misc.make_ones(*args, **kwargs)
def make_nan(
self,
*size: Size,
num_solutions: Optional[int] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > torch.Tensor:
"""
Make a new tensor filled with NaN values, or fill an existing tensor
with NaN values.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: Size of the new tensor to be filled with NaN.
This can be given as multiple positional arguments, each such
positional argument being an integer, or as a single positional
argument of a tuple, the tuple containing multiple integers.
Note that, if the user wishes to fill an existing tensor with
NaN values, then no positional argument is expected.
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
out: Optionally, the tensor to be filled by NaN values.
If an `out` tensor is given, then no `size` argument is expected.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The created or modified tensor after placing NaN values.
"""
args, kwargs = self.__get_all_args_for_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
)
return misc.make_nan(*args, **kwargs)
def make_I(
self,
size: Optional[int] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > torch.Tensor:
"""
Make a new identity matrix (I), or change an existing tensor so that
it expresses the identity matrix.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: A single integer specifying the length of the target square
matrix. In this context, "length" means both rowwise length
and columnwise length, since the target is a square matrix.
Note that, if the user wishes to fill an existing tensor with
identity values, then `size` is expected to be left as None.
out: Optionally, the existing tensor whose values will be changed
so that they represent an identity matrix.
If an `out` tensor is given, then `size` is expected as None.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The created or modified tensor after placing the I matrix values
"""
if (len(size) == 0) and (out is None):
if hasattr(self, "solution_length"):
size = self.solution_length
else:
raise AttributeError(
"The method `.make_I(...)` was used without any `size`"
" arguments."
" When the `size` argument is missing, the default"
" behavior of this method is to create an identity matrix"
" of size (n, n), n being the length of a solution."
" However, the parent object of this method does not have"
" an attribute name `solution_length`."
)
args, kwargs = self.__get_all_args_for_maker(
*size,
num_solutions=None,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
)
return misc.make_I(*args, **kwargs)
def make_uniform(
self,
*size: Size,
num_solutions: Optional[int] = None,
lb: Optional[RealOrVector] = None,
ub: Optional[RealOrVector] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
generator: Any = None,
) > torch.Tensor:
"""
Make a new or existing tensor filled by uniformly distributed values.
Both lower and upper bounds are inclusive.
This function can work with both float and int dtypes.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: Size of the new tensor to be filled with uniformly distributed
values. This can be given as multiple positional arguments, each
such positional argument being an integer, or as a single
positional argument of a tuple, the tuple containing multiple
integers. Note that, if the user wishes to fill an existing
tensor instead, then no positional argument is expected.
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
lb: Lower bound for the uniformly distributed values.
Can be a scalar, or a tensor.
If not specified, the lower bound will be taken as 0.
Note that, if one specifies `lb`, then `ub` is also expected to
be explicitly specified.
ub: Upper bound for the uniformly distributed values.
Can be a scalar, or a tensor.
If not specified, the upper bound will be taken as 1.
Note that, if one specifies `ub`, then `lb` is also expected to
be explicitly specified.
out: Optionally, the tensor to be filled by uniformly distributed
values. If an `out` tensor is given, then no `size` argument is
expected.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
generator: Pseudorandom generator to be used when sampling
the values. Can be a `torch.Generator` or any object with
a `generator` attribute (e.g. a Problem object).
If not given, then this method's parent object will be
analyzed whether or not it has its own generator.
If it does, that generator will be used.
If not, the global generator of PyTorch will be used.
Returns:
The created or modified tensor after placing the uniformly
distributed values.
"""
args, kwargs = self.__get_all_args_for_random_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
generator=generator,
)
return misc.make_uniform(*args, lb=lb, ub=ub, **kwargs)
def make_gaussian(
self,
*size: Size,
num_solutions: Optional[int] = None,
center: Optional[RealOrVector] = None,
stdev: Optional[RealOrVector] = None,
symmetric: bool = False,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
generator: Any = None,
) > torch.Tensor:
"""
Make a new or existing tensor filled by Gaussian distributed values.
This function can work only with float dtypes.
Args:
size: Size of the new tensor to be filled with Gaussian distributed
values. This can be given as multiple positional arguments, each
such positional argument being an integer, or as a single
positional argument of a tuple, the tuple containing multiple
integers. Note that, if the user wishes to fill an existing
tensor instead, then no positional argument is expected.
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
center: Center point (i.e. mean) of the Gaussian distribution.
Can be a scalar, or a tensor.
If not specified, the center point will be taken as 0.
Note that, if one specifies `center`, then `stdev` is also
expected to be explicitly specified.
stdev: Standard deviation for the Gaussian distributed values.
Can be a scalar, or a tensor.
If not specified, the standard deviation will be taken as 1.
Note that, if one specifies `stdev`, then `center` is also
expected to be explicitly specified.
symmetric: Whether or not the values should be sampled in a
symmetric (i.e. antithetic) manner.
The default is False.
out: Optionally, the tensor to be filled by Gaussian distributed
values. If an `out` tensor is given, then no `size` argument is
expected.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
generator: Pseudorandom generator to be used when sampling
the values. Can be a `torch.Generator` or any object with
a `generator` attribute (e.g. a Problem object).
If not given, then this method's parent object will be
analyzed whether or not it has its own generator.
If it does, that generator will be used.
If not, the global generator of PyTorch will be used.
Returns:
The created or modified tensor after placing the Gaussian
distributed values.
"""
args, kwargs = self.__get_all_args_for_random_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
generator=generator,
)
return misc.make_gaussian(*args, center=center, stdev=stdev, symmetric=symmetric, **kwargs)
def make_randint(
self,
*size: Size,
n: Union[int, float, torch.Tensor],
num_solutions: Optional[int] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
generator: Any = None,
) > torch.Tensor:
"""
Make a new or existing tensor filled by random integers.
The integers are uniformly distributed within `[0 ... n1]`.
This function can be used with integer or float dtypes.
Args:
size: Size of the new tensor to be filled with uniformly distributed
values. This can be given as multiple positional arguments, each
such positional argument being an integer, or as a single
positional argument of a tuple, the tuple containing multiple
integers. Note that, if the user wishes to fill an existing
tensor instead, then no positional argument is expected.
n: Number of choice(s) for integer sampling.
The lowest possible value will be 0, and the highest possible
value will be n  1.
`n` can be a scalar, or a tensor.
out: Optionally, the tensor to be filled by the random integers.
If an `out` tensor is given, then no `size` argument is
expected.
dtype: Optionally a string (e.g. "int64") or a PyTorch dtype
(e.g. torch.int64).
If `dtype` is not specified (and also `out` is None),
`torch.int64` will be used.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
generator: Pseudorandom generator to be used when sampling
the values. Can be a `torch.Generator` or any object with
a `generator` attribute (e.g. a Problem object).
If not given, then this method's parent object will be
analyzed whether or not it has its own generator.
If it does, that generator will be used.
If not, the global generator of PyTorch will be used.
Returns:
The created or modified tensor after placing the uniformly
distributed values.
"""
if (dtype is None) and (out is None):
dtype = torch.int64
args, kwargs = self.__get_all_args_for_random_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
generator=generator,
)
return misc.make_randint(*args, n=n, **kwargs)
def as_tensor(
self,
x: Any,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > torch.Tensor:
"""
Get the tensor counterpart of the given object `x`.
Args:
x: Any object to be converted to a tensor.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32) or, for creating an `ObjectArray`,
"object" (as string) or `object` or `Any`.
If `dtype` is not specified, the dtype of this method's
parent object will be used.
device: The device in which the resulting tensor will be stored.
If `device` is not specified, the device of this method's
parent object will be used.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The tensor counterpart of the given object `x`.
"""
kwargs = self.__get_dtype_and_device_kwargs(dtype=dtype, device=device, use_eval_dtype=use_eval_dtype, out=None)
return misc.as_tensor(x, **kwargs)
def ensure_tensor_length_and_dtype(
self,
t: Any,
length: Optional[int] = None,
dtype: Optional[DType] = None,
about: Optional[str] = None,
*,
allow_scalar: bool = False,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > Iterable:
"""
Return the given sequence as a tensor while also confirming its
length, dtype, and device.
Default length, dtype, device are taken from this method's
parent object.
In more details, these attributes belonging to this method's parent
object will be used for determining the the defaults:
`solution_length`, `dtype`, and `device`.
Args:
t: The tensor, or a sequence which is convertible to a tensor.
length: The length to which the tensor is expected to conform.
If missing, the `solution_length` attribute of this method's
parent object will be used as the default value.
dtype: The dtype to which the tensor is expected to conform.
If `dtype` argument is missing and `use_eval_dtype` is False,
then the default dtype will be determined by the `dtype`
attribute of this method's parent object.
If `dtype` argument is missing and `use_eval_dtype` is True,
then the default dtype will be determined by the `eval_dtype`
attribute of this method's parent object.
about: The prefix for the error message. Can be left as None.
allow_scalar: Whether or not to accept scalars in addition
to vector of the desired length.
If `allow_scalar` is False, then scalars will be converted
to sequences of the desired length. The sequence will contain
the same scalar, repeated.
If `allow_scalar` is True, then the scalar itself will be
converted to a PyTorch scalar, and then will be returned.
device: The device in which the sequence is to be stored.
If the given sequence is on a different device than the
desired device, a copy on the correct device will be made.
If device is None, the default behavior of `torch.tensor(...)`
will be used, that is: if `t` is already a tensor, the result
will be on the same device, otherwise, the result will be on
the cpu.
use_eval_dtype: Whether or not to use the evaluation dtype
(instead of the dtype of decision values).
If this is given as True, the `dtype` argument is expected
as None.
If `dtype` argument is missing and `use_eval_dtype` is False,
then the default dtype will be determined by the `dtype`
attribute of this method's parent object.
If `dtype` argument is missing and `use_eval_dtype` is True,
then the default dtype will be determined by the `eval_dtype`
attribute of this method's parent object.
Returns:
The sequence whose correctness in terms of length, dtype, and
device is ensured.
Raises:
ValueError: if there is a length mismatch.
"""
if length is None:
if hasattr(self, "solution_length"):
length = self.solution_length
else:
raise AttributeError(
f"{about}: The argument `length` was found to be None."
f" When the `length` argument is None, the default behavior is to use the `solution_length`"
f" attribute of this method's parent object."
f" However, this method's parent object does NOT have a `solution_length` attribute."
)
dtype_and_device = self.__get_dtype_and_device_kwargs(
dtype=dtype, device=device, use_eval_dtype=use_eval_dtype, out=None
)
return misc.ensure_tensor_length_and_dtype(
t, length=length, about=about, allow_scalar=allow_scalar, **dtype_and_device
)
def make_uniform_shaped_like(
self,
t: torch.Tensor,
*,
lb: Optional[RealOrVector] = None,
ub: Optional[RealOrVector] = None,
) > torch.Tensor:
"""
Make a new uniformlyfilled tensor, shaped like the given tensor.
The `dtype` and `device` will be determined by the parent of this
method (not by the given tensor).
If the parent of this method has its own random generator, then that
generator will be used.
Args:
t: The tensor according to which the result will be shaped.
lb: The inclusive lower bounds for the uniform distribution.
Can be a scalar or a tensor.
If left as None, 0.0 will be used as the upper bound.
ub: The inclusive upper bounds for the uniform distribution.
Can be a scalar or a tensor.
If left as None, 1.0 will be used as the upper bound.
Returns:
A new tensor whose shape is the same with the given tensor.
"""
return self.make_uniform(t.shape, lb=lb, ub=ub)
def make_gaussian_shaped_like(
self,
t: torch.Tensor,
*,
center: Optional[RealOrVector] = None,
stdev: Optional[RealOrVector] = None,
) > torch.Tensor:
"""
Make a new tensor, shaped like the given tensor, with its values
filled by the Gaussian distribution.
The `dtype` and `device` will be determined by the parent of this
method (not by the given tensor).
If the parent of this method has its own random generator, then that
generator will be used.
Args:
t: The tensor according to which the result will be shaped.
center: Center point for the Gaussian distribution.
Can be a scalar or a tensor.
If left as None, 0.0 will be used as the center point.
stdev: The standard deviation for the Gaussian distribution.
Can be a scalar or a tensor.
If left as None, 1.0 will be used as the standard deviation.
Returns:
A new tensor whose shape is the same with the given tensor.
"""
return self.make_gaussian(t.shape, center=center, stdev=stdev)
as_tensor(self, x, dtype=None, device=None, use_eval_dtype=False)
¶
Get the tensor counterpart of the given object x
.
Parameters:
Name  Type  Description  Default 

x 
Any 
Any object to be converted to a tensor. 
required 
dtype 
Union[str, torch.dtype, numpy.dtype, Type] 
Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32) or, for creating an 
None 
device 
Union[str, torch.device] 
The device in which the resulting tensor will be stored.
If 
None 
use_eval_dtype 
bool 
If this is given as True and a 
False 
Returns:
Type  Description 

Tensor 
The tensor counterpart of the given object 
Source code in evotorch/tools/tensormaker.py
def as_tensor(
self,
x: Any,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > torch.Tensor:
"""
Get the tensor counterpart of the given object `x`.
Args:
x: Any object to be converted to a tensor.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32) or, for creating an `ObjectArray`,
"object" (as string) or `object` or `Any`.
If `dtype` is not specified, the dtype of this method's
parent object will be used.
device: The device in which the resulting tensor will be stored.
If `device` is not specified, the device of this method's
parent object will be used.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The tensor counterpart of the given object `x`.
"""
kwargs = self.__get_dtype_and_device_kwargs(dtype=dtype, device=device, use_eval_dtype=use_eval_dtype, out=None)
return misc.as_tensor(x, **kwargs)
ensure_tensor_length_and_dtype(self, t, length=None, dtype=None, about=None, *, allow_scalar=False, device=None, use_eval_dtype=False)
¶
Return the given sequence as a tensor while also confirming its length, dtype, and device.
Default length, dtype, device are taken from this method's
parent object.
In more details, these attributes belonging to this method's parent
object will be used for determining the the defaults:
solution_length
, dtype
, and device
.
Parameters:
Name  Type  Description  Default 

t 
Any 
The tensor, or a sequence which is convertible to a tensor. 
required 
length 
Optional[int] 
The length to which the tensor is expected to conform.
If missing, the 
None 
dtype 
Union[str, torch.dtype, numpy.dtype, Type] 
The dtype to which the tensor is expected to conform.
If 
None 
about 
Optional[str] 
The prefix for the error message. Can be left as None. 
None 
allow_scalar 
bool 
Whether or not to accept scalars in addition
to vector of the desired length.
If 
False 
device 
Union[str, torch.device] 
The device in which the sequence is to be stored.
If the given sequence is on a different device than the
desired device, a copy on the correct device will be made.
If device is None, the default behavior of 
None 
use_eval_dtype 
bool 
Whether or not to use the evaluation dtype
(instead of the dtype of decision values).
If this is given as True, the 
False 
Returns:
Type  Description 

Iterable 
The sequence whose correctness in terms of length, dtype, and device is ensured. 
Exceptions:
Type  Description 

ValueError 
if there is a length mismatch. 
Source code in evotorch/tools/tensormaker.py
def ensure_tensor_length_and_dtype(
self,
t: Any,
length: Optional[int] = None,
dtype: Optional[DType] = None,
about: Optional[str] = None,
*,
allow_scalar: bool = False,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > Iterable:
"""
Return the given sequence as a tensor while also confirming its
length, dtype, and device.
Default length, dtype, device are taken from this method's
parent object.
In more details, these attributes belonging to this method's parent
object will be used for determining the the defaults:
`solution_length`, `dtype`, and `device`.
Args:
t: The tensor, or a sequence which is convertible to a tensor.
length: The length to which the tensor is expected to conform.
If missing, the `solution_length` attribute of this method's
parent object will be used as the default value.
dtype: The dtype to which the tensor is expected to conform.
If `dtype` argument is missing and `use_eval_dtype` is False,
then the default dtype will be determined by the `dtype`
attribute of this method's parent object.
If `dtype` argument is missing and `use_eval_dtype` is True,
then the default dtype will be determined by the `eval_dtype`
attribute of this method's parent object.
about: The prefix for the error message. Can be left as None.
allow_scalar: Whether or not to accept scalars in addition
to vector of the desired length.
If `allow_scalar` is False, then scalars will be converted
to sequences of the desired length. The sequence will contain
the same scalar, repeated.
If `allow_scalar` is True, then the scalar itself will be
converted to a PyTorch scalar, and then will be returned.
device: The device in which the sequence is to be stored.
If the given sequence is on a different device than the
desired device, a copy on the correct device will be made.
If device is None, the default behavior of `torch.tensor(...)`
will be used, that is: if `t` is already a tensor, the result
will be on the same device, otherwise, the result will be on
the cpu.
use_eval_dtype: Whether or not to use the evaluation dtype
(instead of the dtype of decision values).
If this is given as True, the `dtype` argument is expected
as None.
If `dtype` argument is missing and `use_eval_dtype` is False,
then the default dtype will be determined by the `dtype`
attribute of this method's parent object.
If `dtype` argument is missing and `use_eval_dtype` is True,
then the default dtype will be determined by the `eval_dtype`
attribute of this method's parent object.
Returns:
The sequence whose correctness in terms of length, dtype, and
device is ensured.
Raises:
ValueError: if there is a length mismatch.
"""
if length is None:
if hasattr(self, "solution_length"):
length = self.solution_length
else:
raise AttributeError(
f"{about}: The argument `length` was found to be None."
f" When the `length` argument is None, the default behavior is to use the `solution_length`"
f" attribute of this method's parent object."
f" However, this method's parent object does NOT have a `solution_length` attribute."
)
dtype_and_device = self.__get_dtype_and_device_kwargs(
dtype=dtype, device=device, use_eval_dtype=use_eval_dtype, out=None
)
return misc.ensure_tensor_length_and_dtype(
t, length=length, about=about, allow_scalar=allow_scalar, **dtype_and_device
)
make_I(self, size=None, out=None, dtype=None, device=None, use_eval_dtype=False)
¶
Make a new identity matrix (I), or change an existing tensor so that it expresses the identity matrix.
When not explicitly specified via arguments, the dtype and the device of the resulting tensor is determined by this method's parent object.
Parameters:
Name  Type  Description  Default 

size 
Optional[int] 
A single integer specifying the length of the target square
matrix. In this context, "length" means both rowwise length
and columnwise length, since the target is a square matrix.
Note that, if the user wishes to fill an existing tensor with
identity values, then 
None 
out 
Optional[torch.Tensor] 
Optionally, the existing tensor whose values will be changed
so that they represent an identity matrix.
If an 
None 
dtype 
Union[str, torch.dtype, numpy.dtype, Type] 
Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If 
None 
device 
Union[str, torch.device] 
The device in which the new empty tensor will be stored.
If not specified (and also 
None 
use_eval_dtype 
bool 
If this is given as True and a 
False 
Returns:
Type  Description 

Tensor 
The created or modified tensor after placing the I matrix values 
Source code in evotorch/tools/tensormaker.py
def make_I(
self,
size: Optional[int] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > torch.Tensor:
"""
Make a new identity matrix (I), or change an existing tensor so that
it expresses the identity matrix.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: A single integer specifying the length of the target square
matrix. In this context, "length" means both rowwise length
and columnwise length, since the target is a square matrix.
Note that, if the user wishes to fill an existing tensor with
identity values, then `size` is expected to be left as None.
out: Optionally, the existing tensor whose values will be changed
so that they represent an identity matrix.
If an `out` tensor is given, then `size` is expected as None.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The created or modified tensor after placing the I matrix values
"""
if (len(size) == 0) and (out is None):
if hasattr(self, "solution_length"):
size = self.solution_length
else:
raise AttributeError(
"The method `.make_I(...)` was used without any `size`"
" arguments."
" When the `size` argument is missing, the default"
" behavior of this method is to create an identity matrix"
" of size (n, n), n being the length of a solution."
" However, the parent object of this method does not have"
" an attribute name `solution_length`."
)
args, kwargs = self.__get_all_args_for_maker(
*size,
num_solutions=None,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
)
return misc.make_I(*args, **kwargs)
make_empty(self, *size, *, num_solutions=None, out=None, dtype=None, device=None, use_eval_dtype=False)
¶
Make an empty tensor.
When not explicitly specified via arguments, the dtype and the device of the resulting tensor is determined by this method's parent object.
Parameters:
Name  Type  Description  Default 

size 
Union[int, torch.Size] 
Shape of the empty tensor to be created.
expected as multiple positional arguments of integers,
or as a single positional argument containing a tuple of
integers.
Note that when the user wishes to create an 
() 
num_solutions 
Optional[int] 
This can be used instead of the 
None 
dtype 
Union[str, torch.dtype, numpy.dtype, Type] 
Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32) or, for creating an 
None 
device 
Union[str, torch.device] 
The device in which the new empty tensor will be stored.
If not specified (and also 
None 
use_eval_dtype 
bool 
If this is given as True and a 
False 
Returns:
Type  Description 

Iterable 
The new empty tensor, which can be a PyTorch tensor or an

Source code in evotorch/tools/tensormaker.py
def make_empty(
self,
*size: Size,
num_solutions: Optional[int] = None,
out: Optional[Iterable] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > Iterable:
"""
Make an empty tensor.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: Shape of the empty tensor to be created.
expected as multiple positional arguments of integers,
or as a single positional argument containing a tuple of
integers.
Note that when the user wishes to create an `ObjectArray`
(i.e. when `dtype` is given as `object`), then the size
is expected as a single integer, or as a singleelement
tuple containing an integer (because `ObjectArray` can only
be onedimensional).
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32) or, for creating an `ObjectArray`,
"object" (as string) or `object` or `Any`.
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The new empty tensor, which can be a PyTorch tensor or an
`ObjectArray`.
"""
args, kwargs = self.__get_all_args_for_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
)
return misc.make_empty(*args, **kwargs)
make_gaussian(self, *size, *, num_solutions=None, center=None, stdev=None, symmetric=False, out=None, dtype=None, device=None, use_eval_dtype=False, generator=None)
¶
Make a new or existing tensor filled by Gaussian distributed values. This function can work only with float dtypes.
Parameters:
Name  Type  Description  Default 

size 
Union[int, torch.Size] 
Size of the new tensor to be filled with Gaussian distributed values. This can be given as multiple positional arguments, each such positional argument being an integer, or as a single positional argument of a tuple, the tuple containing multiple integers. Note that, if the user wishes to fill an existing tensor instead, then no positional argument is expected. 
() 
num_solutions 
Optional[int] 
This can be used instead of the 
None 
center 
Union[float, Iterable[float], torch.Tensor] 
Center point (i.e. mean) of the Gaussian distribution.
Can be a scalar, or a tensor.
If not specified, the center point will be taken as 0.
Note that, if one specifies 
None 
stdev 
Union[float, Iterable[float], torch.Tensor] 
Standard deviation for the Gaussian distributed values.
Can be a scalar, or a tensor.
If not specified, the standard deviation will be taken as 1.
Note that, if one specifies 
None 
symmetric 
bool 
Whether or not the values should be sampled in a symmetric (i.e. antithetic) manner. The default is False. 
False 
out 
Optional[torch.Tensor] 
Optionally, the tensor to be filled by Gaussian distributed
values. If an 
None 
dtype 
Union[str, torch.dtype, numpy.dtype, Type] 
Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If 
None 
device 
Union[str, torch.device] 
The device in which the new empty tensor will be stored.
If not specified (and also 
None 
use_eval_dtype 
bool 
If this is given as True and a 
False 
generator 
Any 
Pseudorandom generator to be used when sampling
the values. Can be a 
None 
Returns:
Type  Description 

Tensor 
The created or modified tensor after placing the Gaussian distributed values. 
Source code in evotorch/tools/tensormaker.py
def make_gaussian(
self,
*size: Size,
num_solutions: Optional[int] = None,
center: Optional[RealOrVector] = None,
stdev: Optional[RealOrVector] = None,
symmetric: bool = False,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
generator: Any = None,
) > torch.Tensor:
"""
Make a new or existing tensor filled by Gaussian distributed values.
This function can work only with float dtypes.
Args:
size: Size of the new tensor to be filled with Gaussian distributed
values. This can be given as multiple positional arguments, each
such positional argument being an integer, or as a single
positional argument of a tuple, the tuple containing multiple
integers. Note that, if the user wishes to fill an existing
tensor instead, then no positional argument is expected.
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
center: Center point (i.e. mean) of the Gaussian distribution.
Can be a scalar, or a tensor.
If not specified, the center point will be taken as 0.
Note that, if one specifies `center`, then `stdev` is also
expected to be explicitly specified.
stdev: Standard deviation for the Gaussian distributed values.
Can be a scalar, or a tensor.
If not specified, the standard deviation will be taken as 1.
Note that, if one specifies `stdev`, then `center` is also
expected to be explicitly specified.
symmetric: Whether or not the values should be sampled in a
symmetric (i.e. antithetic) manner.
The default is False.
out: Optionally, the tensor to be filled by Gaussian distributed
values. If an `out` tensor is given, then no `size` argument is
expected.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
generator: Pseudorandom generator to be used when sampling
the values. Can be a `torch.Generator` or any object with
a `generator` attribute (e.g. a Problem object).
If not given, then this method's parent object will be
analyzed whether or not it has its own generator.
If it does, that generator will be used.
If not, the global generator of PyTorch will be used.
Returns:
The created or modified tensor after placing the Gaussian
distributed values.
"""
args, kwargs = self.__get_all_args_for_random_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
generator=generator,
)
return misc.make_gaussian(*args, center=center, stdev=stdev, symmetric=symmetric, **kwargs)
make_gaussian_shaped_like(self, t, *, center=None, stdev=None)
¶
Make a new tensor, shaped like the given tensor, with its values filled by the Gaussian distribution.
The dtype
and device
will be determined by the parent of this
method (not by the given tensor).
If the parent of this method has its own random generator, then that
generator will be used.
Parameters:
Name  Type  Description  Default 

t 
Tensor 
The tensor according to which the result will be shaped. 
required 
center 
Union[float, Iterable[float], torch.Tensor] 
Center point for the Gaussian distribution. Can be a scalar or a tensor. If left as None, 0.0 will be used as the center point. 
None 
stdev 
Union[float, Iterable[float], torch.Tensor] 
The standard deviation for the Gaussian distribution. Can be a scalar or a tensor. If left as None, 1.0 will be used as the standard deviation. 
None 
Returns:
Type  Description 

Tensor 
A new tensor whose shape is the same with the given tensor. 
Source code in evotorch/tools/tensormaker.py
def make_gaussian_shaped_like(
self,
t: torch.Tensor,
*,
center: Optional[RealOrVector] = None,
stdev: Optional[RealOrVector] = None,
) > torch.Tensor:
"""
Make a new tensor, shaped like the given tensor, with its values
filled by the Gaussian distribution.
The `dtype` and `device` will be determined by the parent of this
method (not by the given tensor).
If the parent of this method has its own random generator, then that
generator will be used.
Args:
t: The tensor according to which the result will be shaped.
center: Center point for the Gaussian distribution.
Can be a scalar or a tensor.
If left as None, 0.0 will be used as the center point.
stdev: The standard deviation for the Gaussian distribution.
Can be a scalar or a tensor.
If left as None, 1.0 will be used as the standard deviation.
Returns:
A new tensor whose shape is the same with the given tensor.
"""
return self.make_gaussian(t.shape, center=center, stdev=stdev)
make_nan(self, *size, *, num_solutions=None, out=None, dtype=None, device=None, use_eval_dtype=False)
¶
Make a new tensor filled with NaN values, or fill an existing tensor with NaN values.
When not explicitly specified via arguments, the dtype and the device of the resulting tensor is determined by this method's parent object.
Parameters:
Name  Type  Description  Default 

size 
Union[int, torch.Size] 
Size of the new tensor to be filled with NaN. This can be given as multiple positional arguments, each such positional argument being an integer, or as a single positional argument of a tuple, the tuple containing multiple integers. Note that, if the user wishes to fill an existing tensor with NaN values, then no positional argument is expected. 
() 
num_solutions 
Optional[int] 
This can be used instead of the 
None 
out 
Optional[torch.Tensor] 
Optionally, the tensor to be filled by NaN values.
If an 
None 
dtype 
Union[str, torch.dtype, numpy.dtype, Type] 
Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If 
None 
device 
Union[str, torch.device] 
The device in which the new empty tensor will be stored.
If not specified (and also 
None 
use_eval_dtype 
bool 
If this is given as True and a 
False 
Returns:
Type  Description 

Tensor 
The created or modified tensor after placing NaN values. 
Source code in evotorch/tools/tensormaker.py
def make_nan(
self,
*size: Size,
num_solutions: Optional[int] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > torch.Tensor:
"""
Make a new tensor filled with NaN values, or fill an existing tensor
with NaN values.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: Size of the new tensor to be filled with NaN.
This can be given as multiple positional arguments, each such
positional argument being an integer, or as a single positional
argument of a tuple, the tuple containing multiple integers.
Note that, if the user wishes to fill an existing tensor with
NaN values, then no positional argument is expected.
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
out: Optionally, the tensor to be filled by NaN values.
If an `out` tensor is given, then no `size` argument is expected.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The created or modified tensor after placing NaN values.
"""
args, kwargs = self.__get_all_args_for_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
)
return misc.make_nan(*args, **kwargs)
make_ones(self, *size, *, num_solutions=None, out=None, dtype=None, device=None, use_eval_dtype=False)
¶
Make a new tensor filled with 1, or fill an existing tensor with 1.
When not explicitly specified via arguments, the dtype and the device of the resulting tensor is determined by this method's parent object.
Parameters:
Name  Type  Description  Default 

size 
Union[int, torch.Size] 
Size of the new tensor to be filled with 1. This can be given as multiple positional arguments, each such positional argument being an integer, or as a single positional argument of a tuple, the tuple containing multiple integers. Note that, if the user wishes to fill an existing tensor with 1 values, then no positional argument is expected. 
() 
num_solutions 
Optional[int] 
This can be used instead of the 
None 
out 
Optional[torch.Tensor] 
Optionally, the tensor to be filled by 1 values.
If an 
None 
dtype 
Union[str, torch.dtype, numpy.dtype, Type] 
Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If 
None 
device 
Union[str, torch.device] 
The device in which the new empty tensor will be stored.
If not specified (and also 
None 
use_eval_dtype 
bool 
If this is given as True and a 
False 
Returns:
Type  Description 

Tensor 
The created or modified tensor after placing 1 values. 
Source code in evotorch/tools/tensormaker.py
def make_ones(
self,
*size: Size,
num_solutions: Optional[int] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > torch.Tensor:
"""
Make a new tensor filled with 1, or fill an existing tensor with 1.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: Size of the new tensor to be filled with 1.
This can be given as multiple positional arguments, each such
positional argument being an integer, or as a single positional
argument of a tuple, the tuple containing multiple integers.
Note that, if the user wishes to fill an existing tensor with
1 values, then no positional argument is expected.
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
out: Optionally, the tensor to be filled by 1 values.
If an `out` tensor is given, then no `size` argument is expected.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The created or modified tensor after placing 1 values.
"""
args, kwargs = self.__get_all_args_for_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
)
return misc.make_ones(*args, **kwargs)
make_randint(self, *size, *, n, num_solutions=None, out=None, dtype=None, device=None, use_eval_dtype=False, generator=None)
¶
Make a new or existing tensor filled by random integers.
The integers are uniformly distributed within [0 ... n1]
.
This function can be used with integer or float dtypes.
Parameters:
Name  Type  Description  Default 

size 
Union[int, torch.Size] 
Size of the new tensor to be filled with uniformly distributed values. This can be given as multiple positional arguments, each such positional argument being an integer, or as a single positional argument of a tuple, the tuple containing multiple integers. Note that, if the user wishes to fill an existing tensor instead, then no positional argument is expected. 
() 
n 
Union[int, float, torch.Tensor] 
Number of choice(s) for integer sampling.
The lowest possible value will be 0, and the highest possible
value will be n  1.

required 
out 
Optional[torch.Tensor] 
Optionally, the tensor to be filled by the random integers.
If an 
None 
dtype 
Union[str, torch.dtype, numpy.dtype, Type] 
Optionally a string (e.g. "int64") or a PyTorch dtype
(e.g. torch.int64).
If 
None 
device 
Union[str, torch.device] 
The device in which the new empty tensor will be stored.
If not specified (and also 
None 
use_eval_dtype 
bool 
If this is given as True and a 
False 
generator 
Any 
Pseudorandom generator to be used when sampling
the values. Can be a 
None 
Returns:
Type  Description 

Tensor 
The created or modified tensor after placing the uniformly distributed values. 
Source code in evotorch/tools/tensormaker.py
def make_randint(
self,
*size: Size,
n: Union[int, float, torch.Tensor],
num_solutions: Optional[int] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
generator: Any = None,
) > torch.Tensor:
"""
Make a new or existing tensor filled by random integers.
The integers are uniformly distributed within `[0 ... n1]`.
This function can be used with integer or float dtypes.
Args:
size: Size of the new tensor to be filled with uniformly distributed
values. This can be given as multiple positional arguments, each
such positional argument being an integer, or as a single
positional argument of a tuple, the tuple containing multiple
integers. Note that, if the user wishes to fill an existing
tensor instead, then no positional argument is expected.
n: Number of choice(s) for integer sampling.
The lowest possible value will be 0, and the highest possible
value will be n  1.
`n` can be a scalar, or a tensor.
out: Optionally, the tensor to be filled by the random integers.
If an `out` tensor is given, then no `size` argument is
expected.
dtype: Optionally a string (e.g. "int64") or a PyTorch dtype
(e.g. torch.int64).
If `dtype` is not specified (and also `out` is None),
`torch.int64` will be used.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
generator: Pseudorandom generator to be used when sampling
the values. Can be a `torch.Generator` or any object with
a `generator` attribute (e.g. a Problem object).
If not given, then this method's parent object will be
analyzed whether or not it has its own generator.
If it does, that generator will be used.
If not, the global generator of PyTorch will be used.
Returns:
The created or modified tensor after placing the uniformly
distributed values.
"""
if (dtype is None) and (out is None):
dtype = torch.int64
args, kwargs = self.__get_all_args_for_random_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
generator=generator,
)
return misc.make_randint(*args, n=n, **kwargs)
make_tensor(self, data, *, dtype=None, device=None, use_eval_dtype=False, read_only=False)
¶
Make a new tensor.
When not explicitly specified via arguments, the dtype and the device of the resulting tensor is determined by this method's parent object.
Parameters:
Name  Type  Description  Default 

data 
Any 
The data to be converted to a tensor.
If one wishes to create a PyTorch tensor, this can be anything
that can be stored by a PyTorch tensor.
If one wishes to create an 
required 
dtype 
Union[str, torch.dtype, numpy.dtype, Type] 
Optionally a string (e.g. "float32"), or a PyTorch dtype
(e.g. torch.float32), or 
None 
device 
Union[str, torch.device] 
The device in which the tensor will be stored.
If 
None 
use_eval_dtype 
bool 
If this is given as True and a 
False 
read_only 
bool 
Whether or not the created tensor will be readonly. By default, this is False. 
False 
Returns:
Type  Description 

Iterable 
A PyTorch tensor or an ObjectArray. 
Source code in evotorch/tools/tensormaker.py
def make_tensor(
self,
data: Any,
*,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
read_only: bool = False,
) > Iterable:
"""
Make a new tensor.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
data: The data to be converted to a tensor.
If one wishes to create a PyTorch tensor, this can be anything
that can be stored by a PyTorch tensor.
If one wishes to create an `ObjectArray` and therefore passes
`dtype=object`, then the provided `data` is expected as an
`Iterable`.
dtype: Optionally a string (e.g. "float32"), or a PyTorch dtype
(e.g. torch.float32), or `object` or "object" (as a string)
or `Any` if one wishes to create an `ObjectArray`.
If `dtype` is not specified it will be assumed that the user
wishes to create a tensor using the dtype of this method's
parent object.
device: The device in which the tensor will be stored.
If `device` is not specified, it will be assumed that the user
wishes to create a tensor on the device of this method's
parent object.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
read_only: Whether or not the created tensor will be readonly.
By default, this is False.
Returns:
A PyTorch tensor or an ObjectArray.
"""
kwargs = self.__get_dtype_and_device_kwargs(dtype=dtype, device=device, use_eval_dtype=use_eval_dtype, out=None)
return misc.make_tensor(data, read_only=read_only, **kwargs)
make_uniform(self, *size, *, num_solutions=None, lb=None, ub=None, out=None, dtype=None, device=None, use_eval_dtype=False, generator=None)
¶
Make a new or existing tensor filled by uniformly distributed values. Both lower and upper bounds are inclusive. This function can work with both float and int dtypes.
When not explicitly specified via arguments, the dtype and the device of the resulting tensor is determined by this method's parent object.
Parameters:
Name  Type  Description  Default 

size 
Union[int, torch.Size] 
Size of the new tensor to be filled with uniformly distributed values. This can be given as multiple positional arguments, each such positional argument being an integer, or as a single positional argument of a tuple, the tuple containing multiple integers. Note that, if the user wishes to fill an existing tensor instead, then no positional argument is expected. 
() 
num_solutions 
Optional[int] 
This can be used instead of the 
None 
lb 
Union[float, Iterable[float], torch.Tensor] 
Lower bound for the uniformly distributed values.
Can be a scalar, or a tensor.
If not specified, the lower bound will be taken as 0.
Note that, if one specifies 
None 
ub 
Union[float, Iterable[float], torch.Tensor] 
Upper bound for the uniformly distributed values.
Can be a scalar, or a tensor.
If not specified, the upper bound will be taken as 1.
Note that, if one specifies 
None 
out 
Optional[torch.Tensor] 
Optionally, the tensor to be filled by uniformly distributed
values. If an 
None 
dtype 
Union[str, torch.dtype, numpy.dtype, Type] 
Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If 
None 
device 
Union[str, torch.device] 
The device in which the new empty tensor will be stored.
If not specified (and also 
None 
use_eval_dtype 
bool 
If this is given as True and a 
False 
generator 
Any 
Pseudorandom generator to be used when sampling
the values. Can be a 
None 
Returns:
Type  Description 

Tensor 
The created or modified tensor after placing the uniformly distributed values. 
Source code in evotorch/tools/tensormaker.py
def make_uniform(
self,
*size: Size,
num_solutions: Optional[int] = None,
lb: Optional[RealOrVector] = None,
ub: Optional[RealOrVector] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
generator: Any = None,
) > torch.Tensor:
"""
Make a new or existing tensor filled by uniformly distributed values.
Both lower and upper bounds are inclusive.
This function can work with both float and int dtypes.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: Size of the new tensor to be filled with uniformly distributed
values. This can be given as multiple positional arguments, each
such positional argument being an integer, or as a single
positional argument of a tuple, the tuple containing multiple
integers. Note that, if the user wishes to fill an existing
tensor instead, then no positional argument is expected.
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
lb: Lower bound for the uniformly distributed values.
Can be a scalar, or a tensor.
If not specified, the lower bound will be taken as 0.
Note that, if one specifies `lb`, then `ub` is also expected to
be explicitly specified.
ub: Upper bound for the uniformly distributed values.
Can be a scalar, or a tensor.
If not specified, the upper bound will be taken as 1.
Note that, if one specifies `ub`, then `lb` is also expected to
be explicitly specified.
out: Optionally, the tensor to be filled by uniformly distributed
values. If an `out` tensor is given, then no `size` argument is
expected.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
generator: Pseudorandom generator to be used when sampling
the values. Can be a `torch.Generator` or any object with
a `generator` attribute (e.g. a Problem object).
If not given, then this method's parent object will be
analyzed whether or not it has its own generator.
If it does, that generator will be used.
If not, the global generator of PyTorch will be used.
Returns:
The created or modified tensor after placing the uniformly
distributed values.
"""
args, kwargs = self.__get_all_args_for_random_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
generator=generator,
)
return misc.make_uniform(*args, lb=lb, ub=ub, **kwargs)
make_uniform_shaped_like(self, t, *, lb=None, ub=None)
¶
Make a new uniformlyfilled tensor, shaped like the given tensor.
The dtype
and device
will be determined by the parent of this
method (not by the given tensor).
If the parent of this method has its own random generator, then that
generator will be used.
Parameters:
Name  Type  Description  Default 

t 
Tensor 
The tensor according to which the result will be shaped. 
required 
lb 
Union[float, Iterable[float], torch.Tensor] 
The inclusive lower bounds for the uniform distribution. Can be a scalar or a tensor. If left as None, 0.0 will be used as the upper bound. 
None 
ub 
Union[float, Iterable[float], torch.Tensor] 
The inclusive upper bounds for the uniform distribution. Can be a scalar or a tensor. If left as None, 1.0 will be used as the upper bound. 
None 
Returns:
Type  Description 

Tensor 
A new tensor whose shape is the same with the given tensor. 
Source code in evotorch/tools/tensormaker.py
def make_uniform_shaped_like(
self,
t: torch.Tensor,
*,
lb: Optional[RealOrVector] = None,
ub: Optional[RealOrVector] = None,
) > torch.Tensor:
"""
Make a new uniformlyfilled tensor, shaped like the given tensor.
The `dtype` and `device` will be determined by the parent of this
method (not by the given tensor).
If the parent of this method has its own random generator, then that
generator will be used.
Args:
t: The tensor according to which the result will be shaped.
lb: The inclusive lower bounds for the uniform distribution.
Can be a scalar or a tensor.
If left as None, 0.0 will be used as the upper bound.
ub: The inclusive upper bounds for the uniform distribution.
Can be a scalar or a tensor.
If left as None, 1.0 will be used as the upper bound.
Returns:
A new tensor whose shape is the same with the given tensor.
"""
return self.make_uniform(t.shape, lb=lb, ub=ub)
make_zeros(self, *size, *, num_solutions=None, out=None, dtype=None, device=None, use_eval_dtype=False)
¶
Make a new tensor filled with 0, or fill an existing tensor with 0.
When not explicitly specified via arguments, the dtype and the device of the resulting tensor is determined by this method's parent object.
Parameters:
Name  Type  Description  Default 

size 
Union[int, torch.Size] 
Size of the new tensor to be filled with 0. This can be given as multiple positional arguments, each such positional argument being an integer, or as a single positional argument of a tuple, the tuple containing multiple integers. Note that, if the user wishes to fill an existing tensor with 0 values, then no positional argument is expected. 
() 
num_solutions 
Optional[int] 
This can be used instead of the 
None 
out 
Optional[torch.Tensor] 
Optionally, the tensor to be filled by 0 values.
If an 
None 
dtype 
Union[str, torch.dtype, numpy.dtype, Type] 
Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If 
None 
device 
Union[str, torch.device] 
The device in which the new empty tensor will be stored.
If not specified (and also 
None 
use_eval_dtype 
bool 
If this is given as True and a 
False 
Returns:
Type  Description 

Tensor 
The created or modified tensor after placing 0 values. 
Source code in evotorch/tools/tensormaker.py
def make_zeros(
self,
*size: Size,
num_solutions: Optional[int] = None,
out: Optional[torch.Tensor] = None,
dtype: Optional[DType] = None,
device: Optional[Device] = None,
use_eval_dtype: bool = False,
) > torch.Tensor:
"""
Make a new tensor filled with 0, or fill an existing tensor with 0.
When not explicitly specified via arguments, the dtype and the device
of the resulting tensor is determined by this method's parent object.
Args:
size: Size of the new tensor to be filled with 0.
This can be given as multiple positional arguments, each such
positional argument being an integer, or as a single positional
argument of a tuple, the tuple containing multiple integers.
Note that, if the user wishes to fill an existing tensor with
0 values, then no positional argument is expected.
num_solutions: This can be used instead of the `size` arguments
for specifying the shape of the target tensor.
Expected as an integer, when `num_solutions` is specified
as `n`, the shape of the resulting tensor will be
`(n, m)` where `m` is the solution length reported by this
method's parent object's `solution_length` attribute.
out: Optionally, the tensor to be filled by 0 values.
If an `out` tensor is given, then no `size` argument is expected.
dtype: Optionally a string (e.g. "float32") or a PyTorch dtype
(e.g. torch.float32).
If `dtype` is not specified (and also `out` is None),
it will be assumed that the user wishes to create a tensor
using the dtype of this method's parent object.
If an `out` tensor is specified, then `dtype` is expected
as None.
device: The device in which the new empty tensor will be stored.
If not specified (and also `out` is None), it will be
assumed that the user wishes to create a tensor on the
same device with this method's parent object.
If an `out` tensor is specified, then `device` is expected
as None.
use_eval_dtype: If this is given as True and a `dtype` is not
specified, then the `dtype` of the result will be taken
from the `eval_dtype` attribute of this method's parent
object.
Returns:
The created or modified tensor after placing 0 values.
"""
args, kwargs = self.__get_all_args_for_maker(
*size,
num_solutions=num_solutions,
out=out,
dtype=dtype,
device=device,
use_eval_dtype=use_eval_dtype,
)
return misc.make_zeros(*args, **kwargs)