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[Explo] Consider MLIR / StableHLO / OpenXLA #20

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@mratsim

Besides Apache TVM mentioned in #19 we can also consider using the MLIR / OpenXLA ecosystem that powers JAX (and PyTorch can export to it).

See:

Note that matmul / tensor contraction is named dot_general: https://openxla.org/stablehlo/spec#dot_general

It's unsure if that uses tensor cores for types like FP8 or if it can implement fast NVFP4 attention https://github.com/openxla/stablehlo/pull/2096/changes.

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