numexpr

[abid rahman]

I haven't watched below video, but after seeing the discussion, may be it
will be useful :

http://marakana.com/s/post/1105/2012_pydata_workshop_boosting_numpy_numbexpr_and_cython_video

Abid K.
opencvpython.blogspot.com


On Mon, May 20, 2013 at 9:16 PM, Francesc Alted <francesc at continuum.io>wrote:

> On 5/20/13 1:58 PM, Stéfan van der Walt wrote:
>
>> On Mon, May 20, 2013 at 1:47 PM, Johannes Schönberger
>> <jschoenberger at demuc.de> wrote:
>>
>>> Yes, exposure, edge detection, namely all functions that rely on basic
>>> array multiplication / ufuncs.
>>>
>> I'm hesitant.  The added dependency and code modification adds
>> complexity, and I don't know how much improvement we will get.  Could
>> you do a benchmark of a typical function?
>>
>
> Yes, benchmarking is always a must before taking decisions like this.  At
> any rate, you don't need to make a hard dependency of numexpr.  This is
> what I typically do:
>
> try:
>     import numexpr
>     numexpr_ispresent = True
> except ImportError:
>     numexpr_ispresent = False
>
> and then, in your code:
>
> if numexpr_ispresent:
>     # you numexpr code here
> else:
>     # your other code path here
>
> That means two code paths, which is a bit more complex, but still
> acceptable in many cases.
>
> --
> Francesc Alted
>
>
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