[Fix] Fix bbox overlap fp16 (#1958)

* add CUDA_ARCH check

* add check in cuh

mmcv/ops/csrc/common/cuda/bbox_overlaps_cuda_kernel.cuh

@@ -88,6 +88,7 @@ __global__ void bbox_overlaps_cuda_kernel(const T* bbox1, const T* bbox2,
   }
 }
 
+#if __CUDA_ARCH__ >= 530
 __device__ __forceinline__ __half __half_area(const __half x1, const __half y1,
                                               const __half x2, const __half y2,
                                               const __half offset) {
@@ -141,5 +142,6 @@ __device__ void bbox_overlaps_cuda_kernel_half(
     ious[index] = __hdiv(interS, baseS);
   }
 }
+#endif  // __CUDA_ARCH__ >= 530
 
 #endif  // BBOX_OVERLAPS_CUDA_KERNEL_CUH

mmcv/ops/csrc/pytorch/cuda/bbox_overlaps_cuda.cu

@@ -4,6 +4,7 @@
 
 // Disable fp16 on ROCm device
 #ifndef HIP_DIFF
+#if __CUDA_ARCH__ >= 530
 template <>
 __global__ void bbox_overlaps_cuda_kernel<at::Half>(
     const at::Half* bbox1, const at::Half* bbox2, at::Half* ious,
@@ -14,6 +15,7 @@ __global__ void bbox_overlaps_cuda_kernel<at::Half>(
                                  reinterpret_cast<__half*>(ious), num_bbox1,
                                  num_bbox2, mode, aligned, offset);
 }
+#endif  // __CUDA_ARCH__ >= 530
 #endif  // HIP_DIFF
 
 void BBoxOverlapsCUDAKernelLauncher(const Tensor bboxes1, const Tensor bboxes2,