junrushao opened a new pull request, #16246:
URL: https://github.com/apache/tvm/pull/16246

   In sophisticated usecases, developers may want full control of the relax 
compilation pipeline. A typical workflow looks like:
   - Step 1. Apply a custom relax.pipeline to IRModule
   - Step 2. Invoke `relax.build` to export relax Executable but without any 
additional passes;
   - Step 3. Manipulate the relax Executable.
   
   In the three steps above, both Step 1 and 3 are already supported, and this 
PR aims to enable Step 2, which allows `relax.build` to apply a `None` pipeline 
which contains no passes.
   
   Note: as an advanced behavior, this is enabled only when explicitly setting 
`pipeline=None` and thus backward compatibility is fully preserved.


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