Migrate model class to Tensor

src/backends/cuda/cuda_backend.cu

@@ -2,7 +2,6 @@
 
 #include <cstdio>
 #include <cstdlib>
-#include <cuda_helper.cuh>
 
 #include "backend/cuda.cuh"
 

src/backends/cuda/layer_ops.cu

@@ -3,7 +3,6 @@
 #include "kernels/convolution.cuh"
 #include "kernels/matmul.cuh"
 #include "kernels/pool.cuh"
-#include "utils/cuda_helper.cuh"
 
 using namespace CUDANet::Backend;
 

src/backends/cuda/tensor_ops.cu

@@ -2,7 +2,6 @@
 
 #include "backend.hpp"
 #include "backend/cuda.cuh"
-#include "utils/cuda_helper.cuh"
 #include "kernels/matmul.cuh"
 
 using namespace CUDANet::Backend;