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This PR contains the following updates:
==1.24.3
->==1.25.2
Release Notes
numpy/numpy (numpy)
v1.25.2
Compare Source
NumPy 1.25.2 Release Notes
NumPy 1.25.2 is a maintenance release that fixes bugs and regressions
discovered after the 1.25.1 release. This is the last planned release in
the 1.25.x series, the next release will be 1.26.0, which will use the
meson build system and support Python 3.12. The Python versions
supported by this release are 3.9-3.11.
Contributors
A total of 13 people contributed to this release. People with a "+" by
their names contributed a patch for the first time.
Pull requests merged
A total of 19 pull requests were merged for this release.
-ftrapping-math
with Clang on macOSnp.__all__
getenv
call used for memory policy warningChecksums
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NumPy 1.25.1 Release Notes
NumPy 1.25.1 is a maintenance release that fixes bugs and regressions
discovered after the 1.25.0 release. The Python versions supported by
this release are 3.9-3.11.
Contributors
A total of 10 people contributed to this release. People with a "+" by
their names contributed a patch for the first time.
Pull requests merged
A total of 14 pull requests were merged for this release.
return NULL
to begoto fail
__array_ufunc__
works without any kwargs passedChecksums
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v1.25.0
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NumPy 1.25.0 Release Notes
The NumPy 1.25.0 release continues the ongoing work to improve the
handling and promotion of dtypes, increase the execution speed, and
clarify the documentation. There has also been work to prepare for the
future NumPy 2.0.0 release, resulting in a large number of new and
expired deprecation. Highlights are:
@=
).We will be releasing a NumPy 1.26 when Python 3.12 comes out. That is
needed because distutils has been dropped by Python 3.12 and we will be
switching to using meson for future builds. The next mainline release
will be NumPy 2.0.0. We plan that the 2.0 series will still support
downstream projects built against earlier versions of NumPy.
The Python versions supported in this release are 3.9-3.11.
Deprecations
np.core.MachAr
is deprecated. It is private API. In names definedin
np.core
should generally be considered private.(gh-22638)
np.finfo(None)
is deprecated.(gh-23011)
np.round_
is deprecated. Usenp.round
instead.(gh-23302)
np.product
is deprecated. Usenp.prod
instead.(gh-23314)
np.cumproduct
is deprecated. Usenp.cumprod
instead.(gh-23314)
np.sometrue
is deprecated. Usenp.any
instead.(gh-23314)
np.alltrue
is deprecated. Usenp.all
instead.(gh-23314)
Only ndim-0 arrays are treated as scalars. NumPy used to treat all
arrays of size 1 (e.g.,
np.array([3.14])
) as scalars. In thefuture, this will be limited to arrays of ndim 0 (e.g.,
np.array(3.14)
). The following expressions will report adeprecation warning:
(gh-10615)
numpy.find_common_type
is now deprecated and its useshould be replaced with either
numpy.result_type
ornumpy.promote_types
. Most users leave the secondscalar_types
argument tofind_common_type
as[]
in which casenp.result_type
andnp.promote_types
are both faster and morerobust. When not using
scalar_types
the main difference is thatthe replacement intentionally converts non-native byte-order to
native byte order. Further,
find_common_type
returnsobject
dtype rather than failing promotion. This leads to differences when
the inputs are not all numeric. Importantly, this also happens for
e.g. timedelta/datetime for which NumPy promotion rules are
currently sometimes surprising.
When the
scalar_types
argument is not[]
things are morecomplicated. In most cases, using
np.result_type
and passing thePython values
0
,0.0
, or0j
has the same result as usingint
,float
, orcomplex
inscalar_types
.When
scalar_types
is constructed,np.result_type
is the correctreplacement and it may be passed scalar values like
np.float32(0.0)
. Passing values other than 0, may lead tovalue-inspecting behavior (which
np.find_common_type
never usedand NEP 50 may change in the future). The main possible change in
behavior in this case, is when the array types are signed integers
and scalar types are unsigned.
If you are unsure about how to replace a use of
scalar_types
orwhen non-numeric dtypes are likely, please do not hesitate to open a
NumPy issue to ask for help.
(gh-22539)
Expired deprecations
np.core.machar
andnp.finfo.machar
have been removed.(gh-22638)
+arr
will now raise an error when the dtype is not numeric (andpositive is undefined).
(gh-22998)
A sequence must now be passed into the stacking family of functions
(
stack
,vstack
,hstack
,dstack
andcolumn_stack
).(gh-23019)
np.clip
now defaults to same-kind casting. Falling back to unsafecasting was deprecated in NumPy 1.17.
(gh-23403)
np.clip
will now propagatenp.nan
values passed asmin
ormax
. Previously, a scalar NaN was usually ignored. This wasdeprecated in NumPy 1.17.
(gh-23403)
The
np.dual
submodule has been removed.(gh-23480)
NumPy now always ignores sequence behavior for an array-like
(defining one of the array protocols). (Deprecation started NumPy
1.20)
(gh-23660)
The niche
FutureWarning
when casting to a subarray dtype inastype
or the array creation functions such asasarray
is nowfinalized. The behavior is now always the same as if the subarray
dtype was wrapped into a single field (which was the workaround,
previously). (FutureWarning since NumPy 1.20)
(gh-23666)
==
and!=
warnings have been finalized. The==
and!=
operators on arrays now always:
raise errors that occur during comparisons such as when the
arrays have incompatible shapes
(
np.array([1, 2]) == np.array([1, 2, 3])
).return an array of all
True
or allFalse
when values arefundamentally not comparable (e.g. have different dtypes). An
example is
np.array(["a"]) == np.array([1])
.This mimics the Python behavior of returning
False
andTrue
when comparing incompatible types like
"a" == 1
and"a" != 1
. For a long time these gaveDeprecationWarning
orFutureWarning
.(gh-22707)
Nose support has been removed. NumPy switched to using pytest in
2018 and nose has been unmaintained for many years. We have kept
NumPy's nose support to avoid breaking downstream projects who
might have been using it and not yet switched to pytest or some
other testing framework. With the arrival of Python 3.12, unpatched
nose will raise an error. It is time to move on.
Decorators removed:
These are not to be confused with pytest versions with similar
names, e.g., pytest.mark.slow, pytest.mark.skipif,
pytest.mark.parametrize.
Functions removed:
(gh-23041)
The
numpy.testing.utils
shim has been removed. Importing from thenumpy.testing.utils
shim has been deprecated since 2019, the shimhas now been removed. All imports should be made directly from
numpy.testing
.(gh-23060)
The environment variable to disable dispatching has been removed.
Support for the
NUMPY_EXPERIMENTAL_ARRAY_FUNCTION
environmentvariable has been removed. This variable disabled dispatching with
__array_function__
.(gh-23376)
Support for
y=
as an alias ofout=
has been removed. Thefix
,isposinf
andisneginf
functions allowed usingy=
as a(deprecated) alias for
out=
. This is no longer supported.(gh-23376)
Compatibility notes
The
busday_count
method now correctly handles cases where thebegindates
is later in time than theenddates
. Previously, theenddates
was included, even though the documentation states it isalways excluded.
(gh-23229)
When comparing datetimes and timedelta using
np.equal
ornp.not_equal
numpy previously allowed the comparison withcasting="unsafe"
. This operation now fails. Forcing the outputdtype using the
dtype
kwarg can make the operation succeed, but wedo not recommend it.
(gh-22707)
When loading data from a file handle using
np.load
, if the handleis at the end of file, as can happen when reading multiple arrays by
calling
np.load
repeatedly, numpy previously raisedValueError
if
allow_pickle=False
, andOSError
ifallow_pickle=True
. Nowit raises
EOFError
instead, in both cases.(gh-23105)
np.pad
withmode=wrap
pads with strict multiples of original dataCode based on earlier version of
pad
that usesmode="wrap"
willreturn different results when the padding size is larger than initial
array.
np.pad
withmode=wrap
now always fills the space with strictmultiples of original data even if the padding size is larger than the
initial array.
(gh-22575)
Cython
long_t
andulong_t
removedlong_t
andulong_t
were aliases forlonglong_t
andulonglong_t
and confusing (a remainder from of Python 2). This change may lead to
the errors:
We recommend use of bit-sized types such as
cnp.int64_t
or the use ofcnp.intp_t
which is 32 bits on 32 bit systems and 64 bits on 64 bitsystems (this is most compatible with indexing). If C
long
is desired,use plain
long
ornpy_long
.cnp.int_t
is alsolong
(NumPy'sdefault integer). However,
long
is 32 bit on 64 bit windows and we maywish to adjust this even in NumPy. (Please do not hesitate to contact
NumPy developers if you are curious about this.)
(gh-22637)
Changed error message and type for bad
axes
argument toufunc
The error message and type when a wrong
axes
value is passed toufunc(..., axes=[...])
has changed. The message is now moreindicative of the problem, and if the value is mismatched an
AxisError
will be raised. ATypeError
will still be raised forinvalidinput types.
(gh-22675)
Array-likes that define
__array_ufunc__
can now override ufuncs if used aswhere
If the
where
keyword argument of anumpy.ufunc
{.interpreted-textrole="class"} is a subclass of
numpy.ndarray
{.interpreted-textrole="class"} or is a duck type that defines
numpy.class.__array_ufunc__
{.interpreted-text role="func"} it canoverride the behavior of the ufunc using the same mechanism as the input
and output arguments. Note that for this to work properly, the
where.__array_ufunc__
implementation will have to unwrap thewhere
argument to pass it into the default implementation of the
ufunc
or,for
numpy.ndarray
{.interpreted-text role="class"} subclasses beforeusing
super().__array_ufunc__
.(gh-23240)
Compiling against the NumPy C API is now backwards compatible by default
NumPy now defaults to exposing a backwards compatible subset of the
C-API. This makes the use of
oldest-supported-numpy
unnecessary.Libraries can override the default minimal version to be compatible with
using:
before including NumPy or by passing the equivalent
-D
option to thecompiler. The NumPy 1.25 default is
NPY_1_19_API_VERSION
. Because theNumPy 1.19 C API was identical to the NumPy 1.16 one resulting programs
will be compatible with NumPy 1.16 (from a C-API perspective). This
default will be increased in future non-bugfix releases. You can still
compile against an older NumPy version and run on a newer one.
For more details please see
for-downstream-package-authors
{.interpreted-text role="ref"}.(gh-23528)
New Features
np.einsum
now accepts arrays withobject
dtypeThe code path will call python operators on object dtype arrays, much
like
np.dot
andnp.matmul
.(gh-18053)
Add support for inplace matrix multiplication
It is now possible to perform inplace matrix multiplication via the
@=
operator.
(gh-21120)
Added
NPY_ENABLE_CPU_FEATURES
environment variableUsers may now choose to enable only a subset of the built CPU features
at runtime by specifying the
NPY_ENABLE_CPU_FEATURES
environment variable. Note that these specified features must be outside
the baseline, since those are always assumed. Errors will be raised if
attempting to enable a feature that is either not supported by your CPU,
or that NumPy was not built with.
(gh-22137)
NumPy now has an
np.exceptions
namespaceNumPy now has a dedicated namespace making most exceptions and warnings
available. All of these remain available in the main namespace, although
some may be moved slowly in the future. The main reason for this is to
increase discoverability and add future exceptions.
(gh-22644)
np.linalg
functions return NamedTuplesnp.linalg
functions that return tuples now return namedtuples. Thesefunctions are
eig()
,eigh()
,qr()
,slogdet()
, andsvd()
. Thereturn type is unchanged in instances where these functions return
non-tuples with certain keyword arguments (like
svd(compute_uv=False)
).(gh-22786)
String functions in
np.char
are compatible with NEP 42 custom dtypesCustom dtypes that represent unicode strings or byte strings can now be
passed to the string functions in
np.char
.(gh-22863)
String dtype instances can be created from the string abstract dtype classes
It is now possible to create a string dtype instance with a size without
using the string name of the dtype. For example,
type(np.dtype('U'))(8)
will create a dtype that is equivalent tonp.dtype('U8')
. This feature is most useful when writing generic codedealing with string dtype classes.
(gh-22963)
Fujitsu C/C++ compiler is now supported
Support for Fujitsu compiler has been added. To build with Fujitsu
compiler, run:
SSL2 is now supported
Support for SSL2 has been added. SSL2 is a library that provides
OpenBLAS compatible GEMM functions. To enable SSL2, it need to edit
site.cfg and build with Fujitsu compiler. See site.cfg.example.
(gh-22982)
Improvements
NDArrayOperatorsMixin
specifies that it has no__slots__
The
NDArrayOperatorsMixin
class now specifies that it contains no__slots__
, ensuring that subclasses can now make use of this featurein Python.
(gh-23113)
Fix power of complex zero
np.power
now returns a different result for0^{non-zero}
for complexnumbers. Note that the value is only defined when the real part of the
exponent is larger than zero. Previously, NaN was returned unless the
imaginary part was strictly zero. The return value is either
0+0j
or0-0j
.(gh-18535)
New
DTypePromotionError
NumPy now has a new
DTypePromotionError
which is used when two dtypescannot be promoted to a common one, for example:
raises this new exception.
(gh-22707)
np.show_config
uses information from MesonBuild and system information now contains information from Meson.
np.show_config
now has a new optional parametermode
tohelp customize the output.
(gh-22769)
Fix
np.ma.diff
not preserving the mask when called with arguments prepend/append.Calling
np.ma.diff
with arguments prepend and/or append now returns aMaskedArray
with the input mask preserved.Previously, a
MaskedArray
without the mask was returned.(gh-22776)
Corrected error handling for NumPy C-API in Cython
Many NumPy C functions defined for use in Cython were lacking the
correct error indicator like
except -1
orexcept *
. These have nowbeen added.
(gh-22997)
Ability to directly spawn random number generators
numpy.random.Generator.spawn
now allows to directly spawn new independentchild generators via the
numpy.random.SeedSequence.spawn
mechanism.numpy.random.BitGenerator.spawn
does the same for the underlying bitgenerator.
Additionally,
numpy.random.BitGenerator.seed_seq
now givesdirect access to the seed sequence used for initializing the bit
generator. This allows for example:
safely use rng, child_rng1, and child_rng2
Previously, this was hard to do without passing the
SeedSequence
explicitly. Please see
numpy.random.SeedSequence
for moreinformation.
(gh-23195)
numpy.logspace
now supports a non-scalarbase
argumentThe
base
argument ofnumpy.logspace
can now be array-like if it isbroadcastable against the
start
andstop
arguments.(gh-23275)
np.ma.dot()
now supports for non-2d arraysPreviously
np.ma.dot()
only worked ifa
andb
were both 2d. Now itworks for non-2d arrays as well as
np.dot()
.(gh-23322)
Explicitly show keys of .npz file in repr
NpzFile
shows keys of loaded .npz file when printed.(gh-23357)
NumPy now exposes DType classes in
np.dtypes
The new
numpy.dtypes
module now exposes DType classes and will containfuture dtype related functionality. Most users should have no need to
use these classes directly.
(gh-23358)
Drop dtype metadata before saving in .npy or .npz files
Currently, a
*.npy
file containing a table with a dtype with metadata cannotbe read back. Now,
np.save
andnp.savez
drop metadata before saving.(gh-23371)
numpy.lib.recfunctions.structured_to_unstructured
returns views in more casesstructured_to_unstructured
now returns a view, if the stride betweenthe fields is constant. Prior, padding between the fields or a reversed
field would lead to a copy. This change only applies to
ndarray
,memmap
andrecarray
. For all other array subclasses, the behaviorremains unchanged.
(gh-23652)
Signed and unsigned integers always compare correctly
When
uint64
andint64
are mixed in NumPy, NumPy typically promotesboth to
float64
. This behavior may be argued about but is confusingfor comparisons
==
,<=
, since the results returned can be incorrectbut the conversion is hidden since the result is a boolean. NumPy will
now return the correct results for these by avoiding the cast to float.
(gh-23713)
Performance improvements and changes
Faster
np.argsort
on AVX-512 enabled processors32-bit and 64-bit quicksort algorithm for np.argsort gain up to 6x speed
up on processors that support AVX-512 instruction set.
Thanks to Intel corporation for sponsoring
this work.
(gh-23707)
Faster
np.sort
on AVX-512 enabled processorsQuicksort for 16-bit and 64-bit dtypes gain up to 15x and 9x speed up on
processors that support AVX-512 instruction set.
Thanks to Intel corporation for sponsoring
this work.
(gh-22315)
__array_function__
machinery is now much fasterThe overhead of the majority of functions in NumPy is now smaller
especially when keyword arguments are used. This change significantly
speeds up many simple function calls.
(gh-23020)
ufunc.at
can be much fasterGeneric
ufunc.at
can be up to 9x faster. The conditions for thisspeedup:
If ufuncs with appropriate indexed loops on 1d arguments with the above
conditions,
ufunc.at
can be up to 60x faster (an additional 7xspeedup). Appropriate indexed loops have been added to
add
,subtract
,multiply
,floor_divide
,maximum
,minimum
,fmax
,and
fmin
.The internal logic is similar to the logic used for regular ufuncs,
which also have fast paths.
Thanks to the D. E. Shaw group for sponsoring
this work.
(gh-23136)
Faster membership test on
NpzFile
Membership test on
NpzFile
will no longer decompress the archive if itis successful.
(gh-23661)
Changes
np.r_[]
andnp.c_[]
with certain scalar valuesIn rare cases, using mainly
np.r_
with scalars can lead to differentresults. The main potential changes are highlighted by the following:
Where the second example returned:
The first one is due to a signed integer scalar with an unsigned integer
array, while the second is due to
255
not fitting intoint8
andNumPy currently inspecting values to make this work. (Note that the
second example is expected to change in the future due to
NEP 50 <NEP50>
{.interpreted-text role="ref"}; it will then raise anerror.)
(gh-22539)
Most NumPy functions are wrapped into a C-callable
To speed up the
__array_function__
dispatching, most NumPy functionsare now wrapped into C-callables and are not proper Python functions or
C methods. They still look and feel the same as before (like a Python
function), and this should only improve performance and user experience
(cleaner tracebacks). However, please inform the NumPy developers if
this change confuses your program for some reason.
(gh-23020)
C++ standard library usage
NumPy builds now depend on the C++ standard library, because the
numpy.core._multiarray_umath
extension is linked with the C++ linker.(gh-23601)
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NumPy 1.24.4 Release Notes
NumPy 1.24.4 is a maintenance release that fixes a few bugs
discovered after the 1.24.3 release. It is the last planned
release in the 1.24.x cycle. The Python versions supported by
this release are 3.8-3.11.
Contributors
A total of 4 people contributed to this release. People with a "+" by
their names contributed a patch for the first time.
Pull requests merged
A total of 6 pull requests were merged for this release.
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