scatter axis + gather axis primitives #1813
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Add a
GatherAxisandScatterAxisprimitive to supporttake_along_axisandput_along_axis.The
ScatterAxissupports two reduce modes (none and sum). The sum is useful for the gradient ofGatherAxis. Did not add more reduce modes to manage complexity. One can always useScatterfor the other modes or we can consider adding them in the future.Incidentally closes #1807
TODO:
[ ] transforms
[ ] benchmarks