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As far as I can tell, these were never used, tested or documented. Moreover, they don't make sense semantically since `Grads` behaves like a Dict rather than an ordinal-indexed collection like an Array. Meanwhile, their continued existence is causing issues like #1484.
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After blaming the failed test code, it appears the src file blame is messed up on GH and the actual PR which introduced this does have tests + proper motivation for it. Now I'm not sure what we should do with this functionality. Deprecating it wouldn't get rid of the ambiguities, but it would set us up for removing it along with possibly more of the implicit grads machinery in the future (if we ever get around to that). Adding the suggested methods in #1484 would work, but feels rather unsatisfying and a little hacky. Maybe we could avoid ambiguities by restricting the list of broadcastable functions? I wish https://docs.julialang.org/en/v1/manual/interfaces/#man-interfaces-broadcasting would be a little clearer on how to implement the interface, especially since this is Base's own internal overloads conflicting with us here. WDYT @CarloLucibello @darsnack? |
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As far as I can tell, these were never used, tested or documented. Moreover, they don't make sense semantically since
Gradsbehaves like a Dict rather than an ordinal-indexed collection like an Array. Meanwhile, their continued existence is causing issues like #1484.PR Checklist
Tests are addedDocumentation, if applicable