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Author SHA1 Message Date
Dan Zheng
f3685f9a12 [AutoDiff] Conform Optional to Differentiable. (#32948) 
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.
 2020-07-17 12:07:52 -07:00