anijain2305 opened a new pull request #4600: [Relay][Convert Layout] Handling 
batch norm layout change.
URL: https://github.com/apache/incubator-tvm/pull/4600
 
 
   @yzhliu @trevor-m 
   
   Convert Layout pass was earlier using SimplifyInference pass as a 
pre-requisite to expand batch norm to simpler ops. However, @trevor-m told that 
TRT offloading of Relay graph works better if we keep batch norm intact in 
Relay. This caused a problem with Convert Layout pass that inserts layout 
transforms with batch norm.
   
   This PR propagates the new layout through batch norm, preventing the 
insertion of layout transforms.
   

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