Add rrule for map and expand the testing framework #56
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This implements
rrule(map, f, xs...)
and expandsrrule_test
to allow non-differentiable arguments. For such cases, the user need only passnothing
as the argument's assumed sensitivity.Therrule
formap
is admittedly a little bizarre looking. It was ported from Nabla and attempts to use the same logic but stuffed awkwardly into the ChainRules framework.rrule
formap
requires that the mapped function have anrrule
defined for it.