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Metadata-Version: 2.1
Name: joblib
Version: 0.17.0
Summary: Lightweight pipelining: using Python functions as pipeline jobs.
Home-page: https://joblib.readthedocs.io
Author: Gael Varoquaux
Author-email: gael.varoquaux@normalesup.org
License: BSD
Platform: any
Classifier: Development Status :: 5 - Production/Stable
Classifier: Environment :: Console
Classifier: Intended Audience :: Developers
Classifier: Intended Audience :: Science/Research
Classifier: Intended Audience :: Education
Classifier: License :: OSI Approved :: BSD License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Topic :: Scientific/Engineering
Classifier: Topic :: Utilities
Classifier: Topic :: Software Development :: Libraries
Requires-Python: >=3.6
Joblib is a set of tools to provide **lightweight pipelining in
Python**. In particular:
1. transparent disk-caching of functions and lazy re-evaluation
(memoize pattern)
2. easy simple parallel computing
Joblib is optimized to be **fast** and **robust** on large
data in particular and has specific optimizations for `numpy` arrays. It is
**BSD-licensed**.
==================== ===============================================
**Documentation:** https://joblib.readthedocs.io
**Download:** https://pypi.python.org/pypi/joblib#downloads
**Source code:** https://github.com/joblib/joblib
**Report issues:** https://github.com/joblib/joblib/issues
==================== ===============================================
Vision
--------
The vision is to provide tools to easily achieve better performance and
reproducibility when working with long running jobs.
* **Avoid computing the same thing twice**: code is often rerun again and
again, for instance when prototyping computational-heavy jobs (as in
scientific development), but hand-crafted solutions to alleviate this
issue are error-prone and often lead to unreproducible results.
* **Persist to disk transparently**: efficiently persisting
arbitrary objects containing large data is hard. Using
joblib's caching mechanism avoids hand-written persistence and
implicitly links the file on disk to the execution context of
the original Python object. As a result, joblib's persistence is
good for resuming an application status or computational job, eg
after a crash.
Joblib addresses these problems while **leaving your code and your flow
control as unmodified as possible** (no framework, no new paradigms).
Main features
------------------
1) **Transparent and fast disk-caching of output value:** a memoize or
make-like functionality for Python functions that works well for
arbitrary Python objects, including very large numpy arrays. Separate
persistence and flow-execution logic from domain logic or algorithmic
code by writing the operations as a set of steps with well-defined
inputs and outputs: Python functions. Joblib can save their
computation to disk and rerun it only if necessary::
>>> from joblib import Memory
>>> cachedir = 'your_cache_dir_goes_here'
>>> mem = Memory(cachedir)
>>> import numpy as np
>>> a = np.vander(np.arange(3)).astype(np.float)
>>> square = mem.cache(np.square)
>>> b = square(a) # doctest: +ELLIPSIS
________________________________________________________________________________
[Memory] Calling square...
square(array([[0., 0., 1.],
[1., 1., 1.],
[4., 2., 1.]]))
___________________________________________________________square - 0...s, 0.0min
>>> c = square(a)
>>> # The above call did not trigger an evaluation
2) **Embarrassingly parallel helper:** to make it easy to write readable
parallel code and debug it quickly::
>>> from joblib import Parallel, delayed
>>> from math import sqrt
>>> Parallel(n_jobs=1)(delayed(sqrt)(i**2) for i in range(10))
[0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0]
3) **Fast compressed Persistence**: a replacement for pickle to work
efficiently on Python objects containing large data (
*joblib.dump* & *joblib.load* ).
..
>>> import shutil ; shutil.rmtree(cachedir)