diff --git a/pcdet/ops/pointnet2/pointnet2_stack/src/sampling_gpu.h b/pcdet/ops/pointnet2/pointnet2_stack/src/sampling_gpu.h
new file mode 100644
index 0000000..c33996a
--- /dev/null
+++ b/pcdet/ops/pointnet2/pointnet2_stack/src/sampling_gpu.h
@@ -0,0 +1,23 @@
+#ifndef _SAMPLING_GPU_H
+#define _SAMPLING_GPU_H
+
+#include <torch/serialize/tensor.h>
+#include <ATen/cuda/CUDAContext.h>
+#include<vector>
+
+
+int farthest_point_sampling_wrapper(int b, int n, int m,
+    at::Tensor points_tensor, at::Tensor temp_tensor, at::Tensor idx_tensor);
+
+void farthest_point_sampling_kernel_launcher(int b, int n, int m,
+    const float *dataset, float *temp, int *idxs);
+
+int stack_farthest_point_sampling_wrapper(
+    at::Tensor points_tensor, at::Tensor temp_tensor, at::Tensor xyz_batch_cnt_tensor,
+    at::Tensor idx_tensor, at::Tensor num_sampled_points_tensor);
+
+
+void stack_farthest_point_sampling_kernel_launcher(int N, int batch_size,
+    const float *dataset, float *temp, int *xyz_batch_cnt, int *idxs, int *num_sampled_points);
+
+#endif