First steps to enable SYCL backend in Python Interface

[sommerlukas]

First implementation steps towards supporting the SYCL backend in the CUTLASS Python Interface.

The main additions from this PR are:

• Generating a suitable GEMM template and arguments for the CUTLASS 3.x API and Intel PVC as target.
• Calling DPC++ instead of nvcc to compile device and host code.
• Using the DPCTL library to transfer data and launch the kernel via SYCL.

The support so far focuses on a simple GEMM, epilogues (e.g, with visitor) are not yet supported.

Compilation is currently only possible with development versions of DPC++, the -fsycl-rtc-mode flag that was added to support CUTLASS nested parameter classes in free-function kernels as part of this work is not yet available in releases.

The activation of the SYCL backend via environment variable is a temporary solution, a follow-up will look into a cleaner solution.

[aacostadiaz]

Look good, thanks!!!

I left some questions but I think they will be more relevant for follow up PRs.

[FMarno]

Looks fine to me. Hard to see individual issues, but I also don't really have a knowledge of the whole system.

[FMarno]

Suggested change

	if self._is_sycl():
	q = dpctl.SyclQueue(cutlass.sycl_device())
	module = dpctl.program.create_program_from_spirv(q, cubin_image)
	else:
	err, module = cuda.cuModuleLoadData(cubin_image)
	if err != cuda.CUresult.CUDA_SUCCESS:
	raise RuntimeError("Cuda Error: {}".format(err))
	if self._is_sycl():
	kernel = module.get_sycl_kernel(operation_name)
	else:
	err, kernel = cuda.cuModuleGetFunction(
	module, bytes(str.encode(operation_name)))
	if self._is_sycl():
	q = dpctl.SyclQueue(cutlass.sycl_device())
	module = dpctl.program.create_program_from_spirv(q, cubin_image)
	kernel = module.get_sycl_kernel(operation_name)
	else:
	err, module = cuda.cuModuleLoadData(cubin_image)
	if err != cuda.CUresult.CUDA_SUCCESS:
	raise RuntimeError("Cuda Error: {}".format(err))
	err, kernel = cuda.cuModuleGetFunction(
	module, bytes(str.encode(operation_name)))

[FMarno]

Suggested change

	if self.backend == "nvrtc": # with nvrtc backend
	if self.backend == "nvrtc":

[FMarno]

Suggested change

	elif self.backend == "dpcpp": # with DPC++ backend
	elif self.backend == "dpcpp":