[Numpy-discussion] Numpy 1.11.0b1 is out

[Sebastian Berg]

On Mi, 2016-01-27 at 11:19 +0000, Nadav Horesh wrote:
> Why the dot function/method is slower than @ on python 3.5.1? Tested
> from the latest 1.11 maintenance branch.
> 

The explanation I think is that you do not have a blas optimization. In
which case the fallback mode is probably faster in the @ case (since it
has SSE2 optimization by using einsum, while np.dot does not do that).

Btw. thanks for all the work getting this done Chuck!

- Sebastian


> 
> 
> np.__version__
> Out[39]: '1.11.0.dev0+Unknown'
> 
> 
> %timeit A @ c
> 10000 loops, best of 3: 185 µs per loop
> 
> 
> %timeit A.dot(c)
> 1000 loops, best of 3: 526 µs per loop
> 
> 
> %timeit np.dot(A,c)
> 1000 loops, best of 3: 527 µs per loop
> 
> 
> A.dtype, A.shape, A.flags
> Out[43]: 
> (dtype('float32'), (100, 100, 3),   C_CONTIGUOUS : True
>    F_CONTIGUOUS : False
>    OWNDATA : True
>    WRITEABLE : True
>    ALIGNED : True
>    UPDATEIFCOPY : False)
> 
> 
> c.dtype, c.shape, c.flags
> Out[44]: 
> (dtype('float32'), (3, 3),   C_CONTIGUOUS : True
>    F_CONTIGUOUS : False
>    OWNDATA : True
>    WRITEABLE : True
>    ALIGNED : True
>    UPDATEIFCOPY : False)
> 
> 
> 
> 
> 
> From: NumPy-Discussion <numpy-discussion-bounces at scipy.org> on behalf
> of Charles R Harris <charlesr.harris at gmail.com>
> Sent: 26 January 2016 22:49
> To: numpy-discussion; SciPy Developers List; SciPy Users List
> Subject: [Numpy-discussion] Numpy 1.11.0b1 is out
>   
> 
> 
> 
> Hi All,
> 
>  I'm pleased to announce that  Numpy 1.11.0b1 is now available on
> sourceforge. This is a source release as the mingw32 toolchain is
> broken. Please test it out and report any errors that you discover.
> Hopefully we can do better with 1.11.0 than we did with 1.10.0 ;)
> 
>  Chuck
>     
> _______________________________________________
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> NumPy-Discussion at scipy.org
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> 
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