Implement eps-based AD #3
Description
e = eps(); a = b + c * eps(); ddeps(a, e) #= == c = #
As a demand-driven implementation of ddx, so that we can remove our use of ForwardDiff in Cedar.
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e = eps(); a = b + c * eps(); ddeps(a, e) #= == c = #
As a demand-driven implementation of ddx, so that we can remove our use of ForwardDiff in Cedar.