diff --git a/pcdet/ops/pointnet2/pointnet2_batch/src/sampling_gpu.h b/pcdet/ops/pointnet2/pointnet2_batch/src/sampling_gpu.h
new file mode 100644
index 0000000..dc29476
--- /dev/null
+++ b/pcdet/ops/pointnet2/pointnet2_batch/src/sampling_gpu.h
@@ -0,0 +1,29 @@
+#ifndef _SAMPLING_GPU_H
+#define _SAMPLING_GPU_H
+
+#include <torch/serialize/tensor.h>
+#include <ATen/cuda/CUDAContext.h>
+#include<vector>
+
+
+int gather_points_wrapper_fast(int b, int c, int n, int npoints, 
+    at::Tensor points_tensor, at::Tensor idx_tensor, at::Tensor out_tensor);
+
+void gather_points_kernel_launcher_fast(int b, int c, int n, int npoints, 
+    const float *points, const int *idx, float *out);
+
+
+int gather_points_grad_wrapper_fast(int b, int c, int n, int npoints, 
+    at::Tensor grad_out_tensor, at::Tensor idx_tensor, at::Tensor grad_points_tensor);
+
+void gather_points_grad_kernel_launcher_fast(int b, int c, int n, int npoints, 
+    const float *grad_out, const int *idx, float *grad_points);
+
+
+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);
+
+#endif