optimize ROIAlign kernel

mindspore/ccsrc/backend/kernel_compiler/gpu/cuda_impl/roi_align_impl.cu

@@ -116,7 +116,15 @@ __global__ void ROIAlignKernel(size_t size, const T *input, const T *roi_boxes,
                                const int height, const int width, const int pooled_height, const int pooled_width) {
   for (int thread_idx = blockIdx.x * blockDim.x + threadIdx.x; thread_idx < size;
        thread_idx += blockDim.x * gridDim.x) {
-    int offset, n, c, ph, pw, roi_bin_grid_h, roi_bin_grid_w;
+    int n = thread_idx / pooled_width / pooled_height / channels;
+    const T *roi_box = roi_boxes + n * roi_cols;
+    if (roi_box[0] < static_cast<T>(0.001) && roi_box[1] < static_cast<T>(0.001) &&
+        roi_box[2] < static_cast<T>(0.001) && roi_box[3] < static_cast<T>(0.001) &&
+        roi_box[0] > static_cast<T>(-0.001) && roi_box[1] > static_cast<T>(-0.001) &&
+        roi_box[2] > static_cast<T>(-0.001) && roi_box[3] > static_cast<T>(-0.001)) {
+      continue;
+    }
+    int offset, c, ph, pw, roi_bin_grid_h, roi_bin_grid_w;
     T bin_size_h, bin_size_w, roi_start_h, roi_start_w;
 
     bin_box(thread_idx, roi_boxes, roi_cols, spatial_scale, sample_num, roi_end_mode, channels, height, width,
@@ -183,7 +191,16 @@ __global__ void ROIAlignGradKernel(size_t size, const T *dy, const T *roi_boxes,
                                    const int height, const int width, const int pooled_height, const int pooled_width) {
   for (int thread_idx = blockIdx.x * blockDim.x + threadIdx.x; thread_idx < size;
        thread_idx += blockDim.x * gridDim.x) {
-    int offset, n, c, ph, pw, roi_bin_grid_h, roi_bin_grid_w;
+    int n = thread_idx / pooled_width / pooled_height / channels;
+    const T *roi_box = roi_boxes + n * roi_cols;
+    if (roi_box[0] < static_cast<T>(0.001) && roi_box[1] < static_cast<T>(0.001) &&
+        roi_box[2] < static_cast<T>(0.001) && roi_box[3] < static_cast<T>(0.001) &&
+        roi_box[0] > static_cast<T>(-0.001) && roi_box[1] > static_cast<T>(-0.001) &&
+        roi_box[2] > static_cast<T>(-0.001) && roi_box[3] > static_cast<T>(-0.001)) {
+      continue;
+    }
+
+    int offset, c, ph, pw, roi_bin_grid_h, roi_bin_grid_w;
     T bin_size_h, bin_size_w, roi_start_h, roi_start_w;
 
     bin_box(thread_idx, roi_boxes, roi_cols, spatial_scale, sample_num, roi_end_mode, channels, height, width,