chunit-quic commented on PR #13728:
URL: https://github.com/apache/tvm/pull/13728#issuecomment-1769831936

   Hi @xiaolong18
   Sorry for late reply. We finally can get back to here now. 
   >  the span should be filled quickly after it is parsed into relay ir. In 
this way, since the span has been filled, no consumer can rewrite this 
provider. is that right?
   
   Yes, that’s exactly how we handle this kind of problem. We will recommend 
fixing it this way.
   >  the span should be filled quickly after it is parsed into relay ir. In 
this way, since the span has been filled, no consumer can rewrite this 
provider. is that right?
   
   Somehow it should be fine. Yet it might not be a good choice. Generally, 
using global variable is not desirable. Besides, the map cannot be declared in 
`_SpanFiller`, because lifecycle of `_SpanFiller` is within the scope of 
function `set_span`. That’s why we use the first solution to tackle this 
problem.
   
   Thanks,
   Joey
   


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