[Numpy-discussion] [OT] Starving CPUs article featured in IEEE's ComputingNow portal
Fri Mar 19 17:18:17 CDT 2010
On 19-Mar-10, at 1:13 PM, Anne Archibald wrote:
> I'm not knocking numpy; it does (almost) the best it can. (I'm not
> sure of the optimality of the order in which ufuncs are executed; I
> think some optimizations there are possible.) But a language designed
> from scratch for vector calculations could certainly compile
> expressions into a form that would save a lot of memory accesses,
> particularly if an optimizer combined many lines of code. I've
> actually thought about whether such a thing could be done in python; I
> think the way to do it would be to build expression objects from
> variable objects, then have a single "apply" function that fed values
> in to all the variables.
Some folks across town from you at U de M have built just such at
It does all that, plus automatic differentiation, detection and
correction of numerical instabilities, etc.
Probably the most amazing thing about it is that with recent versions,
you basically flip a switch and it will instead use an available CUDA-
capable Nvidia GPU instead of the CPU. I'll admit, when James Bergstra
initially told me about this plan to make it possible to transparently
switch to running stuff on the GPU, I thought it was so ambitious that
it would never happen. Then it did...
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