I am a newer to tvm. From my point, topi is a bridge between Relay IR and tir. 
A repository of operator implementations, describing what to compute(compute) 
and how to compute (schedule). The FTVMSTrategy mechanism allows relay operator 
to be mapped to highest scored implementation.

 AutoTVM can use compute and schedule collect real tuning time of operator, and 
then use the best result to lower relay ir to tir. Similar to topi.

Now that we have had autoTVM, why we need topi?

Thanks in advance.





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