change ndt_gpu. reset z to 1.

src/common/ndt_gpu/ndt_gpu/common.h

@@ -11,8 +11,8 @@
 
 #define BLOCK_X 16
 #define BLOCK_Y 16
-#define BLOCK_Z 4
-//#define BLOCK_Z 1
+//#define BLOCK_Z 4
+#define BLOCK_Z 1
 
 #define SHARED_MEM_SIZE 3072
 #endif