[AutoDiff] Conform Optional to Differentiable.
#32948
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Make `Optional` conditionally conform to `Differentiable` when the `Wrapped` type does. `Optional.TangentVector` is a wrapper around `Wrapped.TangentVector?`. Also, fix `Array.TangentVector.zeroTangentVectorInitializer`. Resolves TF-1301.
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cc @efremale |
rxwei
reviewed
Jul 17, 2020
rxwei
approved these changes
Jul 17, 2020
dan-zheng
commented
Jul 17, 2020
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| public static var zero: Self { | ||
| return Self(.zero) |
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Note: it seems more efficient to use Optional.TangentVector(nil) as Optional.TangentVector.zero. We can explore the implications when working on differentiation support for Optional.
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@swift-ci Please smoke test |
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We are seeing build failure on Swift CI, it might be related to this change. https://ci.swift.org/job/oss-swift-package-linux-ubuntu-16_04/5328/console |
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Sorry about the test failure! I created #32981 to disable the test. |
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Make
Optionalconditionally conform toDifferentiablewhen theWrappedtype does.Optional.TangentVectoris a wrapper aroundWrapped.TangentVector?, following the design in the Differentiable Programming Manifesto.Also, fix
Array.TangentVector.zeroTangentVectorInitializer.Resolves TF-1301.
Stepping stone towards differentiation support of optional-related operations: TF-1153.