Code generation

[dselivanov]

There is RcppR6 project, mb worth to explore. But I haven't used it myself, so can't tell for sure whether it is relevant or not.

[dfalbel]

I considered using RcppR6 but did not for 2 reasons:

• The project seems to be abandoned (4 years since last commit)
• Sometimes the wrapper has to deal with some R specific things and I didn't find how RcppR6 deal with it. For example: https://github.com/dfalbel/torch/blob/master/src/tensor.cpp#L258

[dfalbel]

In pytorch they have a script to automatically generate wraper code.

https://github.com/pytorch/pytorch/blob/master/tools/autograd/gen_python_functions.py

We probably could do something similar in R.

NimTorch also generates wraper code here: https://github.com/fragcolor-xyz/nimtorch/blob/85b548e43d4bc18580871c3f8a4a0b4670a89cec/torch/generator.nim

altought I didn't find this Declarations.yaml file. Maybe we could generate the source code from here: https://github.com/pytorch/pytorch/blob/master/aten/src/ATen/native/native_functions.yaml

There's also a rust binding the auto generates code here: https://github.com/torchrs/torchrs/blob/master/scripts/generate_wrappers.py

[dfalbel]

Maybe this is the declaration file they use: https://github.com/pytorch/pytorch/blob/master/aten/src/ATen/native/native_functions.yaml

[dfalbel]

Found that Declarations.yaml is created when building pytorch from source. The file looks like this:

- name: add_
  matches_jit_signature: false
  schema_string: aten::add_(Tensor self, Tensor other, *, Scalar alpha=1) -> Tensor
  method_prefix_derived: ''
  arguments:
  - dynamic_type: Tensor
    is_nullable: false
    name: self
    type: Tensor &
  - dynamic_type: Tensor
    is_nullable: false
    name: other
    type: const Tensor &
  - default: 1
    dynamic_type: Scalar
    is_nullable: false
    kwarg_only: true
    name: alpha
    type: Scalar
  method_of:
  - Type
  - Tensor
  mode: native
  python_module: ''
  returns:
  - dynamic_type: Tensor
    name: self
    type: Tensor &
  inplace: true
  is_factory_method: null
  abstract: false
  requires_tensor: false
  device_guard: true
  with_gil: false
  deprecated: false