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Add a par_fold method to Zip to improve the discoverability of Rayon's fold-reduce idiom. #1095
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Seems good - par equivalent of existing Zip::fold. I don't want us to forward everything from parallel iterators to Zip, so let's be conservative with that. It is written in the docs how to use those methods already.
src/parallel/impl_par_methods.rs
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/// let a = Array::<usize, _>::ones((128, 1024)); | ||
/// let b = Array::<usize, _>::ones(128); | ||
/// | ||
/// let sum = Zip::from(a.rows()).and(b.view()).par_fold( |
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/// let sum = Zip::from(a.rows()).and(b.view()).par_fold( | |
/// let weighted_sum = Zip::from(a.rows()).and(&b).par_fold( |
weighted_sum
is just a suggestion.
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You could if you want sync up even more with the existing Zip::fold
in terms of "presentation". By no means necessary, just saying what I'm thinking - (see existing ones to see that they are not perfect). If you want, we mention something like par for each's This is a shorthand for using .into_par_iter().for_each() on Zip.
I do agree which is why I only went for the most common combination of
I do have one question concerning you suggestion though, in let weighted_sum = Zip::from(&a).and(&b).par_fold( you removed the |
Added a suggestion on how this could be worded. I am not too invested in that though as there are too many things to consider in each particular situation so that such general advice might not apply. |
…s fold-reduce idiom.
Oh, I'm sorry about removing the .rows() thing - I was reading way too fast, thought it was .view() too. |
Fixes #1094