stoa edited a comment on pull request #7742:
URL: https://github.com/apache/tvm/pull/7742#issuecomment-855391490
@areusch @tqchen
Hello,
Let then sort out the review feedback in the order of importance:
> I'd like to avoid merging an alternative implementation of
crt_backend_api.c if possible. Could we merge the other PR first and then use
it? I'd like to avoid replacing layers below TVM's operator libraries where
possible.
I can propose the following:
- Do we agree on the following "software stack" ?:
```
inference_application[c,so]
|
c_backend_api.[h,c]
| |
c_runtime_api[h,c' |
TVM RUNTIME AOT
| |
platform-specific[h,c]
```
- Do we agree that, in the AOT path, we do not want to include/compile the
c_runtime_api.[h,c] ?
- Do we agree that the 'g_last_error' (TVMGetSetLastError()) is set by the
running inference application and not by the lower runtime layers:
c_runtime_api|platform_specific ?
In this case, I can move the 'g_last_error' (TVMGetSetLastError()) from the
c_runtime_api[h,c] to the 'c_backend_api.[h,c]' and remove the duplicate
'g_last_error' functionality from the platform-specific implementation,
'runtime.c'.
The 'TVMAPIErrorf()' from the 'c_runtime_api.c' will have to be changed not
to use the 'g_last_error', I have an impression that it is already pretty much
the case.
> Platform-specific defines in 'ai_platform.h': I need to verify and will
get back on this point quickly.
I am noticing that some of similar defines exist in 'c_runtime_api.h' and
this is used pretty extensively throughout the TVM.
However, if we agree that the 'c_runtime-api[h,c]' is not to be used within
the AOT path, we cannot use it.
I can propose to create some sort of 'c_runtime_defs.h' that would include
platform-specific defines for:
- AI_API_ENTRY = TVM_DLL
- AI_API_ALIGNED
- AI_API_WEAK = TVM_WEAK
- etc.
The platform-specific implementation can include this file then instead of
the 'c_runtime_api.h'.
Still the question of testing all different defines remain - but this is
already the case with the 'c_runtime_api.h'.
> i think there are still some open items on the C code (e.g. the
.clang-format should get removed and reformatted; may need to see if files in
src/runtime/contrib/stm32 should be somehow placed under src/runtime/crt,
src/runtime/micro, or src/micro, since they aren't intended to be compiled with
the C++ runtime), but not sure if you're waiting to address the ai_platform.h
question there.
Moving to a different code location is not an issue, please let us know
which directory is most suitable.
And I also see that there is no reason for us to not reformat the C code -
OK.
> I guess my concern with keeping the headers in place is that TVM code is
supposed to be fairly uniform in style.
I will remove the headers.
> 'test_mnist_quant_fp': just wondering if the delete here was intentional?
Yes, intentional. We do not have a possibility to host these test-cases for
downloading and they cannot be dowloaded from elsewhere.
Resuming: If we agree on re-organizing the 'c_runtime-api' as outlined
above, I will align this PR and we will not need a separate PR in this case.
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