add SCATTER_API definition for scatter_mul in scatter.cpp & scatter.h (#344)

Co-authored-by: zenghongtai <1518445275@qq.com>

csrc/scatter.cpp

@@ -239,7 +239,8 @@ scatter_sum(torch::Tensor src, torch::Tensor index, int64_t dim,
   return ScatterSum::apply(src, index, dim, optional_out, dim_size)[0];
 }
 
-torch::Tensor scatter_mul(torch::Tensor src, torch::Tensor index, int64_t dim,
+SCATTER_API torch::Tensor
+scatter_mul(torch::Tensor src, torch::Tensor index, int64_t dim,
             torch::optional<torch::Tensor> optional_out,
             torch::optional<int64_t> dim_size) {
   return ScatterMul::apply(src, index, dim, optional_out, dim_size)[0];

csrc/scatter.h

@@ -15,6 +15,11 @@ scatter_sum(torch::Tensor src, torch::Tensor index, int64_t dim,
             torch::optional<torch::Tensor> optional_out,
             torch::optional<int64_t> dim_size);
 
+SCATTER_API torch::Tensor
+scatter_mul(torch::Tensor src, torch::Tensor index, int64_t dim,
+            torch::optional<torch::Tensor> optional_out,
+            torch::optional<int64_t> dim_size);
+
 SCATTER_API torch::Tensor
 scatter_mean(torch::Tensor src, torch::Tensor index, int64_t dim,
              torch::optional<torch::Tensor> optional_out,