On Wed, May 2, 2018 at 10:11 PM, David Bellot via ublas <ublas@lists.boost.org> wrote:

- Should we integrate smart expression templates? I think there was a gsoc project but I am not sure. What was the output?

it was really good

okay. I cannot see it in the development branch. Is it intended to be integrated into uBLAS?

- Are (smart) expression templates really required?

but after second thought, I wonder like you.

I think smart expression templates could be beneficial in terms of selecting and executing high-performance kernels!

Expression templates seem to be outdated. See https://epubs.siam.org/doi/abs/10.1137/110830125

- How often do expressions like A = B*C + D*D - ... occur in numerical applications?
- Should we provide a fast gemm implementation of the Goto-Algorithm like in Eigen?

why not.

Because, tuning algorithms and getting them to nearly peak performance for standard processors is a nontrivial task to my mind. I am not sure but we could try to integrate and link to existing highly optimized kernels.

And regarding the code infrastructure:

- Do we need iterators within matrix and vector template classes? Or can we generalize the concepts?

once there's been a discussion about that. Can we factorize all this code into one place, one generic concept ?
This would make things so simple and efficient in the end.

Yes, I will try to built iterators for tensors so we can discuss this by investigating my code.

- Can we maybe simplify/replace the projection function with overloaded brackets?

Can we do that ? That would be awesome !

Will try to show that it is possible.

General questions:
- Shall we build uBLAS a high-performance library?

Yes, I suppose.
What do you mean exactly by "high-performance" ?

I wanted to say that uBLAS could serve as an optimizer and dispatcher between different types of existing high-performance libraries instead of providing high-performance functions.

- Could it also be a convenient wrapper library with good interfaces to high-performance libraries such as OpenBLAS?

There's been a lot of them written over the years. They're old now and having a simple way for the user to choose a "backend" would be great.

Yes I think so too.

David

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