v1.13.0rc2
Pre-release==========================
NumPy 1.13.0 Release Notes
This release supports Python 2.7 and 3.4 - 3.6.
Highlights
- Operations like
a + b + c
will reuse temporaries on some platforms,
resulting in less memory use and faster execution. - Inplace operations check if inputs overlap outputs and create temporaries
to avoid problems. - New
__array_ufunc__
attribute provides improved ability for classes to
override default ufunc behavior. - New
np.block
function for creating blocked arrays.
New functions
- New
np.positive
ufunc. - New
np.divmod
ufunc provides more efficient divmod. - New
np.isnat
ufunc tests for NaT special values. - New
np.heaviside
ufunc computes the Heaviside function. - New
np.isin
function, improves onin1d
. - New
np.block
function for creating blocked arrays. - New
PyArray_MapIterArrayCopyIfOverlap
added to NumPy C-API.
See below for details.
Deprecations
- Calling
np.fix
,np.isposinf
, andnp.isneginf
withf(x, y=out)
is deprecated - the argument should be passed asf(x, out=out)
, which
matches other ufunc-like interfaces. - Use of the C-API
NPY_CHAR
type number deprecated since version 1.7 will
now raise deprecation warnings at runtime. Extensions built with older f2py
versions need to be recompiled to remove the warning. np.ma.argsort
,np.ma.minimum.reduce
, andnp.ma.maximum.reduce
should be called with an explicitaxis
argument when applied to arrays with
more than 2 dimensions, as the default value of this argument (None
) is
inconsistent with the rest of numpy (-1
,0
, and0
, respectively).np.ma.MaskedArray.mini
is deprecated, as it almost duplicates the
functionality ofnp.MaskedArray.min
. Exactly equivalent behaviour
can be obtained withnp.ma.minimum.reduce
.- The single-argument form of
np.ma.minimum
andnp.ma.maximum
is
deprecated.np.maximum
.np.ma.minimum(x)
should now be spelt
np.ma.minimum.reduce(x)
, which is consistent with how this would be done
withnp.minimum
. - Calling
ndarray.conjugate
on non-numeric dtypes is deprecated (it
should match the behavior ofnp.conjugate
, which throws an error). - Calling
expand_dims
when theaxis
keyword does not satisfy
-a.ndim - 1 <= axis <= a.ndim
, wherea
is the array being reshaped,
is deprecated.
Future Changes
- Assignment between structured arrays with different field names will change
in NumPy 1.14. Previously, fields in the dst would be set to the value of the
identically-named field in the src. In numpy 1.14 fields will instead be
assigned 'by position': The n-th field of the dst will be set to the n-th
field of the src array. Note that theFutureWarning
raised in NumPy 1.12
incorrectly reported this change as scheduled for NumPy 1.13 rather than
NumPy 1.14.
Build System Changes
numpy.distutils
now automatically determines C-file dependencies with
GCC compatible compilers.
Compatibility notes
Error type changes
numpy.hstack()
now throwsValueError
instead ofIndexError
when
input is empty.- Functions taking an axis argument, when that argument is out of range, now
thrownp.AxisError
instead of a mixture ofIndexError
and
ValueError
. For backwards compatibility,AxisError
subclasses both of
these.
Tuple object dtypes
Support has been removed for certain obscure dtypes that were unintentionally
allowed, of the form (old_dtype, new_dtype)
, where either of the dtypes
is or contains the object
dtype. As an exception, dtypes of the form
(object, [('name', object)])
are still supported due to evidence of
existing use.
DeprecationWarning to error
See Changes section for more detail.
partition
, TypeError when non-integer partition index is used.NpyIter_AdvancedNew
, ValueError whenoa_ndim == 0
andop_axes
is NULLnegative(bool_)
, TypeError when negative applied to booleans.subtract(bool_, bool_)
, TypeError when subtracting boolean from boolean.np.equal, np.not_equal
, object identity doesn't override failed comparison.np.equal, np.not_equal
, object identity doesn't override non-boolean comparison.- Deprecated boolean indexing behavior dropped. See Changes below for details.
- Deprecated
np.alterdot()
andnp.restoredot()
removed.
FutureWarning to changed behavior
See Changes section for more detail.
numpy.average
preserves subclassesarray == None
andarray != None
do element-wise comparison.np.equal, np.not_equal
, object identity doesn't override comparison result.
dtypes are now always true
Previously bool(dtype)
would fall back to the default python
implementation, which checked if len(dtype) > 0
. Since dtype
objects
implement __len__
as the number of record fields, bool
of scalar dtypes
would evaluate to False
, which was unintuitive. Now bool(dtype) == True
for all dtypes.
__getslice__
and __setslice__
are no longer needed in ndarray
subclasses
When subclassing np.ndarray in Python 2.7, it is no longer necessary to
implement __*slice__
on the derived class, as __*item__
will intercept
these calls correctly.
Any code that did implement these will work exactly as before. Code that
invokesndarray.__getslice__
(e.g. through super(...).__getslice__
) will
now issue a DeprecationWarning - .__getitem__(slice(start, end))
should be
used instead.
Indexing MaskedArrays/Constants with ...
(ellipsis) now returns MaskedArray
This behavior mirrors that of np.ndarray, and accounts for nested arrays in
MaskedArrays of object dtype, and ellipsis combined with other forms of
indexing.
C API changes
GUfuncs on empty arrays and NpyIter axis removal
It is now allowed to remove a zero-sized axis from NpyIter. Which may mean
that code removing axes from NpyIter has to add an additional check when
accessing the removed dimensions later on.
The largest followup change is that gufuncs are now allowed to have zero-sized
inner dimensions. This means that a gufunc now has to anticipate an empty inner
dimension, while this was never possible and an error raised instead.
For most gufuncs no change should be necessary. However, it is now possible
for gufuncs with a signature such as (..., N, M) -> (..., M)
to return
a valid result if N=0
without further wrapping code.
PyArray_MapIterArrayCopyIfOverlap
added to NumPy C-API
Similar to PyArray_MapIterArray
but with an additional copy_if_overlap
argument. If copy_if_overlap != 0
, checks if input has memory overlap with
any of the other arrays and make copies as appropriate to avoid problems if the
input is modified during the iteration. See the documentation for more complete
documentation.
New Features
__array_ufunc__
added
This is the renamed and redesigned __numpy_ufunc__
. Any class, ndarray
subclass or not, can define this method or set it to None
in order to
override the behavior of NumPy's ufuncs. This works quite similarly to Python's
__mul__
and other binary operation routines. See the documentation for a
more detailed description of the implementation and behavior of this new
option. The API is provisional, we do not yet guarantee backward compatibility
as modifications may be made pending feedback. See the NEP_ and
documentation_ for more details.
.. _NEP: https://github.com/numpy/numpy/blob/master/doc/neps/ufunc-overrides.rst
.. _documentation: https://github.com/charris/numpy/blob/master/doc/source/reference/arrays.classes.rst
New positive
ufunc
This ufunc corresponds to unary +
, but unlike +
on an ndarray it will raise
an error if array values do not support numeric operations.
New divmod
ufunc
This ufunc corresponds to the Python builtin divmod
, and is used to implement
divmod
when called on numpy arrays. np.divmod(x, y)
calculates a result
equivalent to (np.floor_divide(x, y), np.remainder(x, y))
but is
approximately twice as fast as calling the functions separately.
np.isnat
ufunc tests for NaT special datetime and timedelta values
The new ufunc np.isnat
finds the positions of special NaT values
within datetime and timedelta arrays. This is analogous to np.isnan
.
np.heaviside
ufunc computes the Heaviside function
The new function np.heaviside(x, h0)
(a ufunc) computes the Heaviside
function:
.. code::
{ 0 if x < 0,
heaviside(x, h0) = { h0 if x == 0,
{ 1 if x > 0.
np.block
function for creating blocked arrays
Add a new block
function to the current stacking functions vstack
,
hstack
, and stack
. This allows concatenation across multiple axes
simultaneously, with a similar syntax to array creation, but where elements
can themselves be arrays. For instance::
>>> A = np.eye(2) * 2
>>> B = np.eye(3) * 3
>>> np.block([
... [A, np.zeros((2, 3))],
... [np.ones((3, 2)), B ]
... ])
array([[ 2., 0., 0., 0., 0.],
[ 0., 2., 0., 0., 0.],
[ 1., 1., 3., 0., 0.],
[ 1., 1., 0., 3., 0.],
[ 1., 1., 0., 0., 3.]])
While primarily useful for block matrices, this works for arbitrary dimensions
of arrays.
It is similar to Matlab's square bracket notation for creating block matrices.
isin
function, improving on in1d
The new function isin
tests whether each element of an N-dimensonal
array is present anywhere within a second array. It is an enhancement
of in1d
that preserves the shape of the first array.
Temporary elision
On platforms providing the backtrace
function NumPy will try to avoid
creating temporaries in expression involving basic numeric types.
For example d = a + b + c
is transformed to d = a + b; d += c
which can
improve performance for large arrays as less memory bandwidth is required to
perform the operation.
axes
argument for unique
In an N-dimensional array, the user can now choose the axis along which to look
for duplicate N-1-dimensional elements using numpy.unique
. The original
behaviour is recovered if axis=None
(default).
np.gradient
now supports unevenly spaced data
Users can now specify a not-constant spacing for data.
In particular np.gradient
can now take:
- A single scalar to specify a sample distance for all dimensions.
- N scalars to specify a constant sample distance for each dimension.
i.e.dx
,dy
,dz
, ... - N arrays to specify the coordinates of the values along each dimension of F.
The length of the array must match the size of the corresponding dimension - Any combination of N scalars/arrays with the meaning of 2. and 3.
This means that, e.g., it is now possible to do the following::
>>> f = np.array([[1, 2, 6], [3, 4, 5]], dtype=np.float)
>>> dx = 2.
>>> y = [1., 1.5, 3.5]
>>> np.gradient(f, dx, y)
[array([[ 1. , 1. , -0.5], [ 1. , 1. , -0.5]]),
array([[ 2. , 2. , 2. ], [ 2. , 1.7, 0.5]])]
Support for returning arrays of arbitrary dimensions in apply_along_axis
Previously, only scalars or 1D arrays could be returned by the function passed
to apply_along_axis
. Now, it can return an array of any dimensionality
(including 0D), and the shape of this array replaces the axis of the array
being iterated over.
.ndim
property added to dtype
to complement .shape
For consistency with ndarray
and broadcast
, d.ndim
is a shorthand
for len(d.shape)
.
Support for tracemalloc in Python 3.6
NumPy now supports memory tracing with tracemalloc_ module of Python 3.6 or
newer. Memory allocations from NumPy are placed into the domain defined by
numpy.lib.tracemalloc_domain
.
Note that NumPy allocation will not show up in tracemalloc_ of earlier Python
versions.
.. _tracemalloc: https://docs.python.org/3/library/tracemalloc.html
NumPy may be built with relaxed stride checking debugging
Setting NPY_RELAXED_STRIDES_DEBUG=1 in the environment when relaxed stride
checking is enabled will cause NumPy to be compiled with the affected strides
set to the maximum value of npy_intp in order to help detect invalid usage of
the strides in downstream projects. When enabled, invalid usage often results
in an error being raised, but the exact type of error depends on the details of
the code. TypeError and OverflowError have been observed in the wild.
It was previously the case that this option was disabled for releases and
enabled in master and changing between the two required editing the code. It is
now disabled by default but can be enabled for test builds.
Improvements
Ufunc behavior for overlapping inputs
Operations where ufunc input and output operands have memory overlap
produced undefined results in previous NumPy versions, due to data
dependency issues. In NumPy 1.13.0, results from such operations are
now defined to be the same as for equivalent operations where there is
no memory overlap.
Operations affected now make temporary copies, as needed to eliminate
data dependency. As detecting these cases is computationally
expensive, a heuristic is used, which may in rare cases result to
needless temporary copies. For operations where the data dependency
is simple enough for the heuristic to analyze, temporary copies will
not be made even if the arrays overlap, if it can be deduced copies
are not necessary. As an example,np.add(a, b, out=a)
will not
involve copies.
To illustrate a previously undefined operation::
>>> x = np.arange(16).astype(float)
>>> np.add(x[1:], x[:-1], out=x[1:])
In NumPy 1.13.0 the last line is guaranteed to be equivalent to::
>>> np.add(x[1:].copy(), x[:-1].copy(), out=x[1:])
A similar operation with simple non-problematic data dependence is::
>>> x = np.arange(16).astype(float)
>>> np.add(x[1:], x[:-1], out=x[:-1])
It will continue to produce the same results as in previous NumPy
versions, and will not involve unnecessary temporary copies.
The change applies also to in-place binary operations, for example::
>>> x = np.random.rand(500, 500)
>>> x += x.T
This statement is now guaranteed to be equivalent to x[...] = x + x.T
,
whereas in previous NumPy versions the results were undefined.
Partial support for 64-bit f2py extensions with MinGW
Extensions that incorporate Fortran libraries can now be built using the free
MinGW_ toolset, also under Python 3.5. This works best for extensions that only
do calculations and uses the runtime modestly (reading and writing from files,
for instance). Note that this does not remove the need for Mingwpy; if you make
extensive use of the runtime, you will most likely run into issues_. Instead,
it should be regarded as a band-aid until Mingwpy is fully functional.
Extensions can also be compiled using the MinGW toolset using the runtime
library from the (moveable) WinPython 3.4 distribution, which can be useful for
programs with a PySide1/Qt4 front-end.
.. _issues: https://mingwpy.github.io/issues.html
Performance improvements for packbits
and unpackbits
The functions numpy.packbits
with boolean input and numpy.unpackbits
have
been optimized to be a significantly faster for contiguous data.
Fix for PPC long double floating point information
In previous versions of NumPy, the finfo
function returned invalid
information about the double double
_ format of the longdouble
float type
on Power PC (PPC). The invalid values resulted from the failure of the NumPy
algorithm to deal with the variable number of digits in the significand
that are a feature of PPC long doubles
. This release by-passes the failing
algorithm by using heuristics to detect the presence of the PPC double double
format. A side-effect of using these heuristics is that the finfo
function is faster than previous releases.
.. _PPC long doubles: https://www.ibm.com/support/knowledgecenter/en/ssw_aix_71/com.ibm.aix.genprogc/128bit_long_double_floating-point_datatype.htm
.. _double double: https://en.wikipedia.org/wiki/Quadruple-precision_floating-point_format#Double-double_arithmetic
Better default repr for ndarray
subclasses
Subclasses of ndarray with no repr
specialization now correctly indent
their data and type lines.
More reliable comparisons of masked arrays
Comparisons of masked arrays were buggy for masked scalars and failed for
structured arrays with dimension higher than one. Both problems are now
solved. In the process, it was ensured that in getting the result for a
structured array, masked fields are properly ignored, i.e., the result is equal
if all fields that are non-masked in both are equal, thus making the behaviour
identical to what one gets by comparing an unstructured masked array and then
doing .all()
over some axis.
np.matrix with booleans elements can now be created using the string syntax
np.matrix
failed whenever one attempts to use it with booleans, e.g.,
np.matrix('True')
. Now, this works as expected.
More linalg
operations now accept empty vectors and matrices
All of the following functions in np.linalg
now work when given input
arrays with a 0 in the last two dimensions: det
, slogdet
, pinv
,
eigvals
, eigvalsh
, eig
, eigh
.
Bundled version of LAPACK is now 3.2.2
NumPy comes bundled with a minimal implementation of lapack for systems without
a lapack library installed, under the name of lapack_lite
. This has been
upgraded from LAPACK 3.0.0 (June 30, 1999) to LAPACK 3.2.2 (June 30, 2010). See
the LAPACK changelogs
_ for details on the all the changes this entails.
While no new features are exposed through numpy
, this fixes some bugs
regarding "workspace" sizes, and in some places may use faster algorithms.
.. _LAPACK changelogs
: http://www.netlib.org/lapack/release_notes.html#_4_history_of_lapack_releases
reduce
of np.hypot.reduce
and np.logical_xor
allowed in more cases
This now works on empty arrays, returning 0, and can reduce over multiple axes.
Previously, a ValueError
was thrown in these cases.
Better repr
of object arrays
Object arrays that contain themselves no longer cause a recursion error.
Object arrays that contain list
objects are now printed in a way that makes
clear the difference between a 2d object array, and a 1d object array of lists.
Changes
argsort
on masked arrays takes the same default arguments as sort
By default, argsort
now places the masked values at the end of the sorted
array, in the same way that sort
already did. Additionally, the
end_with
argument is added to argsort
, for consistency with sort
.
Note that this argument is not added at the end, so breaks any code that
passed fill_value
as a positional argument.
average
now preserves subclasses
For ndarray subclasses, numpy.average
will now return an instance of the
subclass, matching the behavior of most other NumPy functions such as mean
.
As a consequence, also calls that returned a scalar may now return a subclass
array scalar.
array == None
and array != None
do element-wise comparison
Previously these operations returned scalars False
and True
respectively.
np.equal, np.not_equal
for object arrays ignores object identity
Previously, these functions always treated identical objects as equal. This had
the effect of overriding comparison failures, comparison of objects that did
not return booleans, such as np.arrays, and comparison of objects where the
results differed from object identity, such as NaNs.
Boolean indexing changes
-
Boolean array-likes (such as lists of python bools) are always treated as
boolean indexes. -
Boolean scalars (including python
True
) are legal boolean indexes and
never treated as integers. -
Boolean indexes must match the dimension of the axis that they index.
-
Boolean indexes used on the lhs of an assignment must match the dimensions of
the rhs. -
Boolean indexing into scalar arrays return a new 1-d array. This means that
array(1)[array(True)]
givesarray([1])
and not the original array.
np.random.multivariate_normal
behavior with bad covariance matrix
It is now possible to adjust the behavior the function will have when dealing
with the covariance matrix by using two new keyword arguments:
-
tol
can be used to specify a tolerance to use when checking that
the covariance matrix is positive semidefinite. -
check_valid
can be used to configure what the function will do in the
presence of a matrix that is not positive semidefinite. Valid options are
ignore
,warn
andraise
. The default value,warn
keeps the
the behavior used on previous releases.
assert_array_less
compares np.inf
and -np.inf
now
Previously, np.testing.assert_array_less
ignored all infinite values. This
is not the expected behavior both according to documentation and intuitively.
Now, -inf < x < inf is considered True
for any real number x and all
other cases fail.
assert_array_
and masked arrays assert_equal
hide less warnings
Some warnings that were previously hidden by the assert_array_
functions are not hidden anymore. In most cases the warnings should be
correct and, should they occur, will require changes to the tests using
these functions.
For the masked array assert_equal
version, warnings may occur when
comparing NaT. The function presently does not handle NaT or NaN
specifically and it may be best to avoid it at this time should a warning
show up due to this change.
offset
attribute value in memmap
objects
The offset
attribute in a memmap
object is now set to the
offset into the file. This is a behaviour change only for offsets
greater than mmap.ALLOCATIONGRANULARITY
.
np.real
and np.imag
return scalars for scalar inputs
Previously, np.real
and np.imag
used to return array objects when
provided a scalar input, which was inconsistent with other functions like
np.angle
and np.conj
.
The polynomial convenience classes cannot be passed to ufuncs
The ABCPolyBase class, from which the convenience classes are derived, sets
__array_ufun__ = None
in order of opt out of ufuncs. If a polynomial
convenience class instance is passed as an argument to a ufunc, a TypeError
will now be raised.
Output arguments to ufuncs can be tuples also for ufunc methods
For calls to ufuncs, it was already possible, and recommended, to use an
out
argument with a tuple for ufuncs with multiple outputs. This has now
been extended to output arguments in the reduce
, accumulate
, and
reduceat
methods. This is mostly for compatibility with __array_ufunc
;
there are no ufuncs yet that have more than one output.
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