[Relax] Initial setup of relax backend pipeline #17626
Merged
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This PR sets up the initial relax backend pipeline, as per thread in https://discuss.tvm.apache.org/t/relax-target-default-pipeline.
Particularly, we organized default list of passes in the default pipeline into four stages:
The expectation is to have the default pipeline work out of the box, while users can still choose to customize the pipeline by importing these lists and combining them together, with customized passes inserted at proper locations.
In this PR, we set up the initial pipelines for CUDA and LLVM backends. The pipelines for both backends will be enhanced and completed in the near future, and meanwhile the default pipeline for more backends (e.g., generic GPUs) will be added.
The existing pipeline registry system in python/tvm/relax/pipeline.py will be gradually deprecated after the establishment of the new relax backend pipeline.