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This PR is the first step towards refactors the build for nvfuser in order to have the coegen being a standalone library.
Contents inside this PR:
1. nvfuser code base has been moved to `./nvfuser`, from `./torch/csrc/jit/codegen/cuda/`, except for registration code for integration (interface.h/interface.cpp)
2. splits the build system so nvfuser is generating its own `.so` files. Currently there are:
- `libnvfuser_codegen.so`, which contains the integration, codegen and runtime system of nvfuser
- `nvfuser.so`, which is nvfuser's python API via pybind. Python frontend is now exposed via `nvfuser._C.XXX` instead of `torch._C._nvfuser`
3. nvfuser cpp tests is currently being compiled into `nvfuser_tests`
4. cmake is refactored so that:
- nvfuser now has its own `CMakeLists.txt`, which is under `torch/csrc/jit/codegen/cuda/`.
- nvfuser backend code is not compiled inside `libtorch_cuda_xxx` any more
- nvfuser is added as a subdirectory under `./CMakeLists.txt` at the very end after torch is built.
- since nvfuser has dependency on torch, the registration of nvfuser at runtime is done via dlopen (`at::DynamicLibrary`). This avoids circular dependency in cmake, which will be a nightmare to handle. For details, look at `torch/csrc/jit/codegen/cuda/interface.cpp::LoadingNvfuserLibrary`
Future work that's scoped in following PR:
- Currently since nvfuser codegen has dependency on torch, we need to refactor that out so we can move nvfuser into a submodule and not rely on dlopen to load the library. @malfet
- Since we moved nvfuser into a cmake build, we effectively disabled bazel build for nvfuser. This could impact internal workload at Meta, so we need to put support back. cc'ing @vors
Pull Request resolved: https://github.com/pytorch/pytorch/pull/89621
Approved by: https://github.com/davidberard98
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| .. | ||
| init.cpp | ||
| init.h | ||
| module_python.h | ||
| pybind_utils.cpp | ||
| pybind_utils.h | ||
| pybind.h | ||
| python_arg_flatten.cpp | ||
| python_arg_flatten.h | ||
| python_custom_class.cpp | ||
| python_custom_class.h | ||
| python_dict.cpp | ||
| python_dict.h | ||
| python_interpreter.cpp | ||
| python_ir.cpp | ||
| python_ir.h | ||
| python_ivalue.h | ||
| python_list.cpp | ||
| python_list.h | ||
| python_sugared_value.cpp | ||
| python_sugared_value.h | ||
| python_tracer.cpp | ||
| python_tracer.h | ||
| python_tree_views.cpp | ||
| python_tree_views.h | ||
| script_init.cpp | ||
| script_init.h | ||
| update_graph_executor_opt.cpp | ||
| update_graph_executor_opt.h | ||