Detailed documentation about the architecture of this LTC backend is available here.
Contained within this directory are the components that implements the Torch-MLIR LTC backend. Note that the code style for LTC components is consistent with that of LTC itself, rather than the rest of Torch-MLIR.
The components are subclasses of the backend API interface classes found under torch/csrc/lazy/backend.
Importantly, the subclasses are still abstract classes. Pure virtual methods
such as Compile were purposefully not overriden as Torch-MLIR does not know
how to compile the model for the target hardware.
The intent is that vendor hardware specific plugins will subclass the Torch-MLIR backend classes and override the remaining pure virtual functions to complete the backend.
The Torch-MLIR LTC backend's job is to perform the lowering from ATen to MLIR. A hardware vendor's backend job is to take care of the actual compile and execution of the lowered MLIR.