#pragma once #include <torch/extension.h> std::tuple<torch::Tensor, torch::Tensor, torch::optional<torch::Tensor>> spspmm_cpu(torch::Tensor rowptrA, torch::Tensor colA, torch::optional<torch::Tensor> optional_valueA, torch::Tensor rowptrB, torch::Tensor colB, torch::optional<torch::Tensor> optional_valueB, int64_t K, std::string reduce);