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Zero
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// Copyright (c) Facebook, Inc. and its affiliates.
#include "box_iou_rotated.h"
#include "box_iou_rotated_utils.h"
namespace detectron2 {
template <typename T>
void box_iou_rotated_cpu_kernel(
const at::Tensor& boxes1,
const at::Tensor& boxes2,
at::Tensor& ious) {
auto num_boxes1 = boxes1.size(0);
auto num_boxes2 = boxes2.size(0);
for (int i = 0; i < num_boxes1; i++) {
for (int j = 0; j < num_boxes2; j++) {
ious[i * num_boxes2 + j] = single_box_iou_rotated<T>(
boxes1[i].data_ptr<T>(), boxes2[j].data_ptr<T>());
}
}
}
at::Tensor box_iou_rotated_cpu(
// input must be contiguous:
const at::Tensor& boxes1,
const at::Tensor& boxes2) {
auto num_boxes1 = boxes1.size(0);
auto num_boxes2 = boxes2.size(0);
at::Tensor ious =
at::empty({num_boxes1 * num_boxes2}, boxes1.options().dtype(at::kFloat));
box_iou_rotated_cpu_kernel<float>(boxes1, boxes2, ious);
// reshape from 1d array to 2d array
auto shape = std::vector<int64_t>{num_boxes1, num_boxes2};
return ious.reshape(shape);
}
} // namespace detectron2
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