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Loïc Estève
Joblib hashing now uses the default pickle protocol (2 for Python
2 and 3 for Python 3). This makes it very unlikely to get the same
hash for a given object under Python 2 and Python 3.
In particular, for Python 3 users, this means that the output of
joblib.hash changes when switching from joblib 0.8.4 to 0.9.2 . We
strive to ensure that the output of joblib.hash does not change
needlessly in future versions of joblib but this is not officially
guaranteed.
Loïc Estève
Joblib pickles generated with Python 2 can not be loaded with
Python 3 and the same applies for joblib pickles generated with
Python 3 and loaded with Python 2.
During the beta period 0.9.0b2 to 0.9.0b4, we experimented with
a joblib serialization that aimed to make pickles serialized with
Python 3 loadable under Python 2. Unfortunately this serialization
strategy proved to be too fragile as far as the long-term
maintenance was concerned (For example see
https://github.com/joblib/joblib/pull/243). That means that joblib
pickles generated with joblib 0.9.0bN can not be loaded under
joblib 0.9.2. Joblib beta testers, who are the only ones likely to
be affected by this, are advised to delete their joblib cache when
they upgrade from 0.9.0bN to 0.9.2.
Arthur Mensch
Fixed a bug with ``joblib.hash`` that used to return unstable values for
strings and numpy.dtype instances depending on interning states.
Olivier Grisel
Make joblib use the 'forkserver' start method by default under Python 3.4+
to avoid causing crash with 3rd party libraries (such as Apple vecLib /
Accelerate or the GCC OpenMP runtime) that use an internal thread pool that
is not reinitialized when a ``fork`` system call happens.
Olivier Grisel
New context manager based API (``with`` block) to re-use
the same pool of workers across consecutive parallel calls.
Vlad Niculae and Olivier Grisel
Automated batching of fast tasks into longer running jobs to
hide multiprocessing dispatching overhead when possible.
Olivier Grisel
FIX make it possible to call ``joblib.load(filename, mmap_mode='r')``
on pickled objects that include a mix of arrays of both
memory memmapable dtypes and object dtype.