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v1.21.0

NumPy 1.21.0 Release Notes

The NumPy 1.21.0 release highlights are

• continued SIMD work covering more functions and platforms,
• initial work on the new dtype infrastructure and casting,
• universal2 wheels for Python 3.8 and Python 3.9 on Mac,
• improved documentation,
• improved annotations,
• newPCG64DXSM bitgenerator for random numbers.

In addition there are the usual large number of bug fixes and otherimprovements.

The Python versions supported for this release are 3.7-3.9. Officialsupport for Python 3.10 will be added when it is released.

⚠️ Warning: there are unresolved problems compiling NumPy 1.21.0 with gcc-11.1 .

• Optimization level-O3 results in many wrong warnings when running the tests.
• On some hardware NumPy will hang in an infinite loop.

New functions

Add PCG64DXSM BitGenerator

Uses of the PCG64 BitGenerator in a massively-parallel context havebeen shown to have statistical weaknesses that were not apparent at thefirst release in numpy 1.17. Most users will never observe this weaknessand are safe to continue to use PCG64. We have introduced a newPCG64DXSM BitGenerator that will eventually become the new defaultBitGenerator implementation used bydefault_rng in future releases.PCG64DXSM solves the statistical weakness while preserving theperformance and the features of PCG64.

Seeupgrading-pcg64 for more details.

(gh-18906)

Expired deprecations

• Theshape argumentnumpy.unravel_index cannot bepassed asdims keyword argument anymore. (Was deprecated in NumPy1.16.)

... (truncated)

• b235f9e Merge pull request#19283 from charris/prepare-1.21.0-release
• 34aebc2 MAINT: Update 1.21.0-notes.rst
• 493b64b MAINT: Update 1.21.0-changelog.rst
• 07d7e72 MAINT: Remove accidentally created directory.
• 032fca5 Merge pull request#19280 from charris/backport-19277
• 7d25b81 BUG: Fix refcount leak in ResultType
• fa5754e BUG: Add missing DECREF in new path
• 61127bb Merge pull request#19268 from charris/backport-19264
• 143d45f Merge pull request#19269 from charris/backport-19228
• d80e473 BUG: Removed typing for == and != in dtypes
• Additional commits viewable incompare view

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