Add fill TessellateIPU primitive mapping popops vertex.
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Compared to the `full` LAX operation, the `fill_p` TessellateIPU primitive ensures that the full array is allocated and filled with a given value (and not broadcasted). As an useful example of using `fill`, in combination with `scatter`, we implement `tile_sharded_identity` which creates an identity matrix, with proper tile mapping, without introducing additional communications.
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Compared to the
fullLAX operation, thefill_pTessellateIPU primitiveensures that the full array is allocated and filled with a given value (and not broadcasted).
As an useful example of using
fill, in combination withscatter, we implementtile_sharded_identitywhich creates an identity matrix, with proper tile mapping, withoutintroducing additional communications.