add notebook for benchmarking top_hat

[haesleinhuepf]

In this notebook you can see that top-hat-box in the non-prototype is much faster than in in the protoype. Any ideas why? This could be interesting for the paper, and potentially speed up other operations too.

[StRigaud]

That's .... suspicious (or great, idk).

I run the notebook on my GPU:

• the prototype is always slower which is not that clear for the disk top-hat for you.
• sphere are more or less at the same speed.
• I also got a factor 2 for the box top-hat.
• I tested that both box top hat produce the same output (quick test say yes)

I cannot explain the speed gain, but I am happy for it I guess.

Can you make sure all is correct ?

[StRigaud]

@haesleinhuepf, this could be related to a possible acceleration from the separable filters, could be interesting to look at other separable filter to see if we see a similar speed up.

[StRigaud]

@haesleinhuepf this is because of the data type!

If you run the filters on float dtype, prototype and pyclesperanto are approximatively on the same speed.
If you run the filters on uint8 dtype, pyclesperanto wins. My guess is that prototype still push/pull all buffer as float in the GPU. So either it is quicker for the GPU to run computation on uint8 than on float, or it is simply the gain in the push/pull operation gain with uint8.

See my updates on the notebook.

PS: also you inversed the disk and square for the skimage footprint. The sphere is REALLY slow for me ....

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[StRigaud]

ready to be merge, unless we want to add more