Jerryzcn commented on a change in pull request #16619: add aligned roi
introduced in Detectron2
URL: https://github.com/apache/incubator-mxnet/pull/16619#discussion_r339256359
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File path: src/operator/contrib/mrcnn_mask_target.cu
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@@ -135,14 +136,21 @@ __device__ void RoIAlignForward(
const T* offset_rois = rois + batch_idx * (4 * num_rois) + n * 4;
// Do not using rounding; this implementation detail is critical
- T roi_start_w = offset_rois[0];
- T roi_start_h = offset_rois[1];
- T roi_end_w = offset_rois[2];
- T roi_end_h = offset_rois[3];
+ T roi_offset = continuous_coordinate ? static_cast<T>(0.5) :
static_cast<T>(0);
+ T roi_start_w = offset_rois[0] - roi_offset;
+ T roi_start_h = offset_rois[1] - roi_offset;
+ T roi_end_w = offset_rois[2] - roi_offset;
+ T roi_end_h = offset_rois[3] - roi_offset;
+
+ T roi_width = roi_end_w - roi_start_w;
+ T roi_height = roi_end_h - roi_start_h;
// Force malformed ROIs to be 1x1
- T roi_width = max(roi_end_w - roi_start_w, (T)1.);
- T roi_height = max(roi_end_h - roi_start_h, (T)1.);
+ if (!continuous_coordinate) { // backward compatiblity
Review comment:
save computation
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