ENH: improved, faster algorithm for array padding

[Josh Warner]

Thanks guys! I'll be bringing a version of this over to scikit-image.utilin the very near future, to be used if NumPy < 1.8.x.

On Monday, May 20, 2013 5:06:31 AM UTC-5, Chintak Sheth wrote:

Cheers Josh!
> On May 20, 2013 3:27 PM, "Stéfan van der Walt" <ste... at sun.ac.za<javascript:>> 
> wrote:
>
>> Kudos to Josh Warner for getting this patch into NumPy so quickly!
>>
>> ---------- Forwarded message ----------
>> From: GitHub
>> Date: Sun, May 19, 2013 at 9:50 PM
>> Subject: [Numpy-svn] [numpy/numpy] 246c06: ENH: improved, faster
>> algorithm for array padding
>>
>>   Branch: refs/heads/master
>>   Home:   https://github.com/numpy/numpy
>>   Commit: 246c06d2475718ec36ba193494444464e497c69a
>>       
>> https://github.com/numpy/numpy/commit/246c06d2475718ec36ba193494444464e497c69a
>>   Author: Josh Warner (Mac) <warner... at mayo.edu <javascript:>>
>>   Date:   2013-05-19 (Sun, 19 May 2013)
>>
>>   Changed paths:
>>     M doc/release/1.8.0-notes.rst
>>     M numpy/lib/arraypad.py
>>     M numpy/lib/tests/test_arraypad.py
>>
>>   Log Message:
>>   -----------
>>   ENH: improved, faster algorithm for array padding
>>
>> New padding method which scales much better with dimensionality.
>> This new implementation is fully vectorized, builds each abstracted
>> n-dimensional padding block in a single step, and takes advantage
>> of separability. The API is completely preserved, and the old
>> algorithm is used if a vector function is input for `mode`.
>>
>> The new algorithm is faster for all tested combinations of inputs,
>> and scales much better with dimensionality. Execution time reductions
>> from ~25% for small rank 1 arrays to >99% for rank 4+ arrays observed.
>>
>>
>>   Commit: 7d188bf1c9ac5bf7ee41e0794d59771802b345bf
>>       
>> https://github.com/numpy/numpy/commit/7d188bf1c9ac5bf7ee41e0794d59771802b345bf
>>   Author: Charles Harris <charles... at gmail.com <javascript:>>
>>   Date:   2013-05-19 (Sun, 19 May 2013)
>>
>>   Changed paths:
>>     M doc/release/1.8.0-notes.rst
>>     M numpy/lib/arraypad.py
>>     M numpy/lib/tests/test_arraypad.py
>>
>>   Log Message:
>>   -----------
>>   Merge pull request #3329 from JDWarner/faster_arraypad
>>
>> ENH: improved, faster algorithm for array padding
>>
>>
>> Compare: 
>> https://github.com/numpy/numpy/compare/5b28d185a494...7d188bf1c9ac
>>
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