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| author | Robert Kern <robert.kern@gmail.com> | 2020-06-10 12:40:45 -0400 |
|---|---|---|
| committer | Robert Kern <robert.kern@gmail.com> | 2020-06-10 12:40:45 -0400 |
| commit | e1db72c2c99d23982551def864b24d277b297aa6 (patch) | |
| tree | 93d6b115755cdff5ef72f966ce2a7dcaaa75b55c | |
| parent | 7a82f14075eaf8f59ea3bb2594b71639e938611e (diff) | |
| download | numpy-fix/seed-sequence-zeros.tar.gz | |
DOC: Add release note.fix/seed-sequence-zeros
| -rw-r--r-- | doc/source/release/1.19.0-notes.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/doc/source/release/1.19.0-notes.rst b/doc/source/release/1.19.0-notes.rst index 35aaf8e4a..b40969550 100644 --- a/doc/source/release/1.19.0-notes.rst +++ b/doc/source/release/1.19.0-notes.rst @@ -267,6 +267,19 @@ of users. (`gh-16068 <https://github.com/numpy/numpy/pull/16068>`__) +``SeedSequence`` with small seeds no longer conflicts with spawning +------------------------------------------------------------------- +Small seeds (less than ``2**96``) are implicitly 0-padded out to 128 bits, the +size of the internal entropy pool. When spawned, the spawn key was concatenated +before the 0-padding. Since the first spawn key is ``(0,)``, small seeds +before the spawn created the same states as the first spawned ``SeedSequence``. +Now, the seed is explicitly 0-padded out to the internal pool size before +concatenating the spawn key. Spawned ``SeedSequences`` will produce different +results than in the previous release. Unspawned ``SeedSequences`` will still +produce the same results. + +(`gh-16551 <https://github.com/numpy/numpy/pull/16551>`__) + C API changes ============= |