[Relay] Plumb external codegen target via Target.current() #11432
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mbs-octoml
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Hi @Mousius I think you're probably the only other person who can review this one! |
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jwfromm
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May 26, 2022
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This is very cool work that seems well designed to me. The only thing I'd like to see is a little documentation that points out all the pieces needed to make it work. For now, just having something brief in the python tests might be enough to get interested readers started.
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…ternal codegen paths (See https://discuss.tvm.apache.org/t/byoc-supporting-cutlass-byoc-with-collage/12796/6 for context, which in turn is part of Collage (https://github.com/apache/tvm-rfcs/blob/main/rfcs/0062-collage.md). We want both old-style (via relay.ext.$toolchain) and new-style (via "RelayToTIR" Pass attribute on target kind) external codegen to be able to access the current 'external codegen' Target instance via Target.current(). - For old-style, plumb the true Target through TEComplier and push it on the context stack before calling relay.ext.$toolchain. - For new-style, pass the CompilationConfig to the RelayToTIRTargetHook pass, make the jump from "Compiler" attribute value to Target via the new CompilationConfig::FindPrimitiveTargetForKind method, and push on the stack before invoking the custom "RelayToTIR" pass. While working on this discovered RelayToTIRTargetHook was incompatible with the VM's compilation flow since RelayToTIRTargetHook assumes all "Compiler" attributed functions are inlined. Generalize it to support both inline and global function styles. Extend Target::IsExternalCodegen to recognize target kinds with "RelayToTIR" attributes as external. Update target hooks unit test to exercise new support for outline-style, picking up the current target, and compiling via the VM.
Can't repro tests/python/contrib/test_ethosu/cascader/test_scheduler.py::test_compute_cycles_annotation failure, flake?
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@tvm-bot merge |
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Cannot merge, did not find any approving reviews from users with write access on 673c5ce |
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(See https://discuss.tvm.apache.org/t/byoc-supporting-cutlass-byoc-with-collage/12796/6 for
context, which in turn is part of Collage (https://github.com/apache/tvm-rfcs/blob/main/rfcs/0062-collage.md).
We want both old-style (via relay.ext.$toolchain) and new-style (via "RelayToTIR" Pass
attribute on target kind) external codegen to be able to access the current 'external codegen'
Target instance via Target.current().
For old-style, plumb the true Target through TEComplier and push it on the context
stack before calling relay.ext.$toolchain.
For new-style, pass the CompilationConfig to the RelayToTIRTargetHook pass, make the jump from
"Compiler" attribute value to Target via the new CompilationConfig::FindPrimitiveTargetForKind
method, and push on the stack before invoking the custom "RelayToTIR" pass.
While working on this discovered RelayToTIRTargetHook was incompatible with the VM's compilation
flow since RelayToTIRTargetHook assumes all "Compiler" attributed functions are inlined. Generalize
it to support both inline and global function styles.
Extend Target::IsExternalCodegen to recognize target kinds with "RelayToTIR" attributes as
external.
Update target hooks unit test to exercise new support for outline-style, picking up the current target,
and compiling via the VM. Also update the example pass to illustrate some of the common gotcha's
when implementing a custom lowering-like pass.