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118 lines
4.4 KiB
118 lines
4.4 KiB
Metadata-Version: 2.1
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Name: joblib
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Version: 0.13.2
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Summary: Lightweight pipelining: using Python functions as pipeline jobs.
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Home-page: https://joblib.readthedocs.io
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Author: Gael Varoquaux
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Author-email: gael.varoquaux@normalesup.org
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License: BSD
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Platform: any
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Classifier: Development Status :: 5 - Production/Stable
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Classifier: Environment :: Console
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Classifier: Intended Audience :: Developers
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Classifier: Intended Audience :: Science/Research
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Classifier: Intended Audience :: Education
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Classifier: License :: OSI Approved :: BSD License
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Classifier: Operating System :: OS Independent
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Classifier: Programming Language :: Python :: 2.7
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Classifier: Programming Language :: Python :: 3
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Classifier: Programming Language :: Python :: 3.4
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Classifier: Programming Language :: Python :: 3.5
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Classifier: Programming Language :: Python :: 3.6
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Classifier: Topic :: Scientific/Engineering
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Classifier: Topic :: Utilities
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Classifier: Topic :: Software Development :: Libraries
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Joblib is a set of tools to provide **lightweight pipelining in
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Python**. In particular:
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1. transparent disk-caching of functions and lazy re-evaluation
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(memoize pattern)
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2. easy simple parallel computing
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Joblib is optimized to be **fast** and **robust** in particular on large
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data and has specific optimizations for `numpy` arrays. It is
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**BSD-licensed**.
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==================== ===============================================
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**Documentation:** https://joblib.readthedocs.io
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**Download:** https://pypi.python.org/pypi/joblib#downloads
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**Source code:** https://github.com/joblib/joblib
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**Report issues:** https://github.com/joblib/joblib/issues
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==================== ===============================================
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Vision
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--------
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The vision is to provide tools to easily achieve better performance and
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reproducibility when working with long running jobs.
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* **Avoid computing twice the same thing**: code is rerun over an
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over, for instance when prototyping computational-heavy jobs (as in
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scientific development), but hand-crafted solution to alleviate this
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issue is error-prone and often leads to unreproducible results
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* **Persist to disk transparently**: persisting in an efficient way
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arbitrary objects containing large data is hard. Using
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joblib's caching mechanism avoids hand-written persistence and
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implicitly links the file on disk to the execution context of
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the original Python object. As a result, joblib's persistence is
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good for resuming an application status or computational job, eg
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after a crash.
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Joblib addresses these problems while **leaving your code and your flow
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control as unmodified as possible** (no framework, no new paradigms).
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Main features
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------------------
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1) **Transparent and fast disk-caching of output value:** a memoize or
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make-like functionality for Python functions that works well for
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arbitrary Python objects, including very large numpy arrays. Separate
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persistence and flow-execution logic from domain logic or algorithmic
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code by writing the operations as a set of steps with well-defined
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inputs and outputs: Python functions. Joblib can save their
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computation to disk and rerun it only if necessary::
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>>> from joblib import Memory
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>>> cachedir = 'your_cache_dir_goes_here'
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>>> mem = Memory(cachedir)
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>>> import numpy as np
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>>> a = np.vander(np.arange(3)).astype(np.float)
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>>> square = mem.cache(np.square)
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>>> b = square(a) # doctest: +ELLIPSIS
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________________________________________________________________________________
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[Memory] Calling square...
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square(array([[0., 0., 1.],
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[1., 1., 1.],
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[4., 2., 1.]]))
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___________________________________________________________square - 0...s, 0.0min
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>>> c = square(a)
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>>> # The above call did not trigger an evaluation
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2) **Embarrassingly parallel helper:** to make it easy to write readable
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parallel code and debug it quickly::
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>>> from joblib import Parallel, delayed
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>>> from math import sqrt
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>>> Parallel(n_jobs=1)(delayed(sqrt)(i**2) for i in range(10))
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[0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0]
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3) **Fast compressed Persistence**: a replacement for pickle to work
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efficiently on Python objects containing large data (
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*joblib.dump* & *joblib.load* ).
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..
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>>> import shutil ; shutil.rmtree(cachedir)
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