You are right; we leverage the existing compiler/optimiser (the support library) for Ethos-N, see https://github.com/ARM-software/ethos-n-driver-stack. Integration at the relay level makes sense for the type of operations that are implemented in Ethos-N. The accelerator is always faster than anything else so there is no need for auto tuning the operators that are greedily handed off at the TVM level, and the optimisation of those operators is done inside the support library as it requires detailed hardware knowledge.
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