[AutoDiff upstream] Upstream _Differentiation APIs.
#30926
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Add `Differentiable.zeroTangentVectorInitializer` protocol requirement and `Differentiable.zeroTangentVector` default implementation.
Add `AnyDerivative`, a type-erased wrapper for `Differentiable.TangentVector` associated type implementations.
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@swift-ci Please test |
rxwei
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Apr 9, 2020
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Add
Differentiable.zeroTangentVectorInitializerprotocol requirement andDifferentiable.zeroTangentVectordefault implementation.Add
AnyDerivative, a type-erased wrapper forDifferentiable.TangentVectorassociated type implementations.
Resolves TF-843.