[GitHub] [incubator-mxnet] haohuanw opened a new pull request #15645: [WIP] handle fix_gamma in tensorrt subgraph conversion correctly

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haohuanw opened a new pull request #15645: [WIP] handle fix_gamma in tensorrt subgraph conversion correctly
URL: https://github.com/apache/incubator-mxnet/pull/15645
 
 
   ## Description ##
   the current nnvm->onnx->tensorrt conversion is ignoring the fix_gamma field for batch norm layer. This commit tries to solve this particular issue by providing a way to massage params map before convert nnvm to onnx.
   
   ## Checklist ##
   ### Essentials ###
   Please feel free to remove inapplicable items for your PR.
   - [ x ] Changes are complete (i.e. I finished coding on this PR)
   - [ ] All changes have test coverage:
     - I verified it locally but still missing a proper unit test for it.
   - [ x ] Code is well-documented: 
   - [ x ] To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
   
   ### Changes ###
   - [ x ] Add "Preprocess" step in nnvm->onnx conversion where allow modifying param map
   
   ## Comments ##
   This is a bug fix for tensor rt subgraph conversion
   

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