Implement backward function for Sub

Context

Implement the backward kernel for Sub operator.

Partially fix #30 (closed)

mentioned in issue #30 (closed)

assigned to @jeromeh

requested review from @pineapple

added Feature 🚀 StatusWork in Progress labels

Here also, as a simple accumulation over broadcasted axes, kernel could be higly optimized

added 9 commits

• be78ac9e...839fa0aa - 7 commits from branch eclipse/aidge:dev
• 9a3803c2 - Add an (unregistered) backward kernel function for Sub
• 0647fe25 - Add test and register Sub backward

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added 1 commit

• ffe4acc2 - Add test and register Sub backward

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Also, I don't know if it is also the case here but your Add baward kernel impl introduced new warnings. Could you remove them and ensure this MR does not add new ones?

resolved all threads

added 1 commit

• ff512139 - Fix warnings by removing unused parameters in Sub backward kernel

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marked this merge request as ready

removed StatusWork in Progress label

added StatusReview Ready label

resolved all threads

added 3 commits

• ff512139...4cea3405 - 2 commits from branch eclipse/aidge:dev
• 5137a620 - Merge branch 'dev' into 'sub-backward'

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changed milestone to %aidge v0.6.0

enabled an automatic merge when all merge checks for 5137a620 pass

merged

mentioned in issue #45