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### Fix torch cpp extension build warnings
For the warnings shown as below:
```
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++
[4/5] c++ -MMD -MF /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/temp.linux-x86_64-cpython-38/opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/custom_function_bw.o.d -pthread -B /opt/conda/envs/ptca/compiler_compat -Wl,--sysroot=/ -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils -I/opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include -I/opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/torch/csrc/api/include -I/opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/TH -I/opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/THC -I/opt/conda/envs/ptca/include/python3.8 -c -c /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/custom_function_bw.cc -o /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/temp.linux-x86_64-cpython-38/opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/custom_function_bw.o -O3 -std=c++17 -DTORCH_API_INCLUDE_EXTENSION_H '-DPYBIND11_COMPILER_TYPE="_gcc"' '-DPYBIND11_STDLIB="_libstdcpp"' '-DPYBIND11_BUILD_ABI="_cxxabi1011"' -DTORCH_EXTENSION_NAME=torch_interop_utils -D_GLIBCXX_USE_CXX11_ABI=0
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++
In file included from /opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/torch/csrc/utils/python_arg_parser.h:65,
from /opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/torch/csrc/utils/tensor_new.h:4,
from /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/custom_function_bw.cc:9:
/opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/torch/csrc/utils/python_strings.h:104:19: warning: ‘pybind11::object PyObject_FastGetAttrString(PyObject*, const char*)’ defined but not used [-Wunused-function]
104 | static py::object PyObject_FastGetAttrString(PyObject* obj, const char* name) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
[5/5] c++ -MMD -MF /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/temp.linux-x86_64-cpython-38/opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/custom_function_fw.o.d -pthread -B /opt/conda/envs/ptca/compiler_compat -Wl,--sysroot=/ -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils -I/opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include -I/opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/torch/csrc/api/include -I/opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/TH -I/opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/THC -I/opt/conda/envs/ptca/include/python3.8 -c -c /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/custom_function_fw.cc -o /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/temp.linux-x86_64-cpython-38/opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/custom_function_fw.o -O3 -std=c++17 -DTORCH_API_INCLUDE_EXTENSION_H '-DPYBIND11_COMPILER_TYPE="_gcc"' '-DPYBIND11_STDLIB="_libstdcpp"' '-DPYBIND11_BUILD_ABI="_cxxabi1011"' -DTORCH_EXTENSION_NAME=torch_interop_utils -D_GLIBCXX_USE_CXX11_ABI=0
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++
In file included from /opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/torch/csrc/utils/python_arg_parser.h:65,
from /opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/torch/csrc/utils/tensor_new.h:4,
from /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/custom_function_fw.cc:13:
/opt/conda/envs/ptca/lib/python3.8/site-packages/torch/include/torch/csrc/utils/python_strings.h:104:19: warning: ‘pybind11::object PyObject_FastGetAttrString(PyObject*, const char*)’ defined but not used [-Wunused-function]
104 | static py::object PyObject_FastGetAttrString(PyObject* obj, const char* name) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
g++ -pthread -B /opt/conda/envs/ptca/compiler_compat -Wl,--sysroot=/ -pthread -shared -B /opt/conda/envs/ptca/compiler_compat -L/opt/conda/envs/ptca/lib -Wl,-rpath=/opt/conda/envs/ptca/lib -Wl,--no-as-needed -Wl,--sysroot=/ /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/temp.linux-x86_64-cpython-38/opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/ctx_pool.o /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/temp.linux-x86_64-cpython-38/opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/custom_function_bw.o /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/temp.linux-x86_64-cpython-38/opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/custom_function_fw.o /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/temp.linux-x86_64-cpython-38/opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/custom_function_shared.o /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/temp.linux-x86_64-cpython-38/opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/cpu/torch_interop_utils/torch_interop_utils.o -L/opt/conda/envs/ptca/lib/python3.8/site-packages/torch/lib -lc10 -ltorch -ltorch_cpu -ltorch_python -o build/lib.linux-x86_64-cpython-38/torch_interop_utils.cpython-38-x86_64-linux-gnu.so
Installing /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/lib.linux-x86_64-cpython-38/fused_ops.cpython-38-x86_64-linux-gnu.so -> /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/fused_ops.cpython-38-x86_64-linux-gnu.so
Installing /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/lib.linux-x86_64-cpython-38/aten_op_executor.cpython-38-x86_64-linux-gnu.so -> /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/aten_op_executor.cpython-38-x86_64-linux-gnu.so
Installing /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/lib.linux-x86_64-cpython-38/torch_gpu_allocator.cpython-38-x86_64-linux-gnu.so -> /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/torch_gpu_allocator.cpython-38-x86_64-linux-gnu.so
Installing /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/build/lib.linux-x86_64-cpython-38/torch_interop_utils.cpython-38-x86_64-linux-gnu.so -> /opt/conda/envs/ptca/lib/python3.8/site-packages/onnxruntime/training/ortmodule/torch_cpp_extensions/torch_interop_utils.cpython-38-x86_64-linux-gnu.so
```
Fix by replacing eixsting `PyObject_GetAttrString` with
`PyObject_FastGetAttrString` which claims to be faster in its
implementation comment.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
|
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|---|---|---|
| .. | ||
| amp | ||
| api | ||
| experimental | ||
| onnxblock | ||
| optim | ||
| ort_triton | ||
| ortmodule | ||
| utils | ||
| __init__.py | ||
| _utils.py | ||
| artifacts.py | ||