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// Copyright (c) OpenMMLab. All rights reserved
#include "pytorch_cpp_helper.hpp"
#include "pytorch_device_registry.hpp"
Tensor nms_cpu(Tensor boxes, Tensor scores, float iou_threshold, int offset) {
if (boxes.numel() == 0) {
return at::empty({0}, boxes.options().dtype(at::kLong));
}
auto x1_t = boxes.select(1, 0).contiguous();
auto y1_t = boxes.select(1, 1).contiguous();
auto x2_t = boxes.select(1, 2).contiguous();
auto y2_t = boxes.select(1, 3).contiguous();
Tensor areas_t = (x2_t - x1_t + offset) * (y2_t - y1_t + offset);
auto order_t = std::get<1>(scores.sort(0, /* descending=*/true));
auto nboxes = boxes.size(0);
Tensor select_t = at::ones({nboxes}, boxes.options().dtype(at::kBool));
auto select = select_t.data_ptr<bool>();
auto order = order_t.data_ptr<int64_t>();
auto x1 = x1_t.data_ptr<float>();
auto y1 = y1_t.data_ptr<float>();
auto x2 = x2_t.data_ptr<float>();
auto y2 = y2_t.data_ptr<float>();
auto areas = areas_t.data_ptr<float>();
for (int64_t _i = 0; _i < nboxes; _i++) {
if (select[_i] == false) continue;
auto i = order[_i];
auto ix1 = x1[i];
auto iy1 = y1[i];
auto ix2 = x2[i];
auto iy2 = y2[i];
auto iarea = areas[i];
for (int64_t _j = _i + 1; _j < nboxes; _j++) {
if (select[_j] == false) continue;
auto j = order[_j];
auto xx1 = std::max(ix1, x1[j]);
auto yy1 = std::max(iy1, y1[j]);
auto xx2 = std::min(ix2, x2[j]);
auto yy2 = std::min(iy2, y2[j]);
auto w = std::max(0.f, xx2 - xx1 + offset);
auto h = std::max(0.f, yy2 - yy1 + offset);
auto inter = w * h;
auto ovr = inter / (iarea + areas[j] - inter);
if (ovr > iou_threshold) select[_j] = false;
}
}
return order_t.masked_select(select_t);
}
Tensor nms_impl(Tensor boxes, Tensor scores, float iou_threshold, int offset);
REGISTER_DEVICE_IMPL(nms_impl, CPU, nms_cpu);
Tensor softnms_cpu(Tensor boxes, Tensor scores, Tensor dets,
float iou_threshold, float sigma, float min_score,
int method, int offset) {
if (boxes.numel() == 0) {
return at::empty({0}, boxes.options().dtype(at::kLong));
}
auto x1_t = boxes.select(1, 0).contiguous();
auto y1_t = boxes.select(1, 1).contiguous();
auto x2_t = boxes.select(1, 2).contiguous();
auto y2_t = boxes.select(1, 3).contiguous();
auto scores_t = scores.clone();
Tensor areas_t = (x2_t - x1_t + offset) * (y2_t - y1_t + offset);
auto nboxes = boxes.size(0);
auto x1 = x1_t.data_ptr<float>();
auto y1 = y1_t.data_ptr<float>();
auto x2 = x2_t.data_ptr<float>();
auto y2 = y2_t.data_ptr<float>();
auto sc = scores_t.data_ptr<float>();
auto areas = areas_t.data_ptr<float>();
auto de = dets.data_ptr<float>();
int64_t pos = 0;
Tensor inds_t = at::arange(nboxes, boxes.options().dtype(at::kLong));
auto inds = inds_t.data_ptr<int64_t>();
for (int64_t i = 0; i < nboxes; i++) {
auto max_score = sc[i];
auto max_pos = i;
pos = i + 1;
// get max box
while (pos < nboxes) {
if (max_score < sc[pos]) {
max_score = sc[pos];
max_pos = pos;
}
pos = pos + 1;
}
// swap
auto ix1 = de[i * 5 + 0] = x1[max_pos];
auto iy1 = de[i * 5 + 1] = y1[max_pos];
auto ix2 = de[i * 5 + 2] = x2[max_pos];
auto iy2 = de[i * 5 + 3] = y2[max_pos];
auto iscore = de[i * 5 + 4] = sc[max_pos];
auto iarea = areas[max_pos];
auto iind = inds[max_pos];
x1[max_pos] = x1[i];
y1[max_pos] = y1[i];
x2[max_pos] = x2[i];
y2[max_pos] = y2[i];
sc[max_pos] = sc[i];
areas[max_pos] = areas[i];
inds[max_pos] = inds[i];
x1[i] = ix1;
y1[i] = iy1;
x2[i] = ix2;
y2[i] = iy2;
sc[i] = iscore;
areas[i] = iarea;
inds[i] = iind;
pos = i + 1;
while (pos < nboxes) {
auto xx1 = std::max(ix1, x1[pos]);
auto yy1 = std::max(iy1, y1[pos]);
auto xx2 = std::min(ix2, x2[pos]);
auto yy2 = std::min(iy2, y2[pos]);
auto w = std::max(0.f, xx2 - xx1 + offset);
auto h = std::max(0.f, yy2 - yy1 + offset);
auto inter = w * h;
auto ovr = inter / (iarea + areas[pos] - inter);
float weight = 1.;
if (method == 0) {
if (ovr >= iou_threshold) weight = 0;
} else if (method == 1) {
if (ovr >= iou_threshold) weight = 1 - ovr;
} else if (method == 2) {
weight = std::exp(-(ovr * ovr) / sigma);
}
sc[pos] *= weight;
// if box score falls below threshold, discard the box by
// swapping with last box update N
if (sc[pos] < min_score) {
x1[pos] = x1[nboxes - 1];
y1[pos] = y1[nboxes - 1];
x2[pos] = x2[nboxes - 1];
y2[pos] = y2[nboxes - 1];
sc[pos] = sc[nboxes - 1];
areas[pos] = areas[nboxes - 1];
inds[pos] = inds[nboxes - 1];
nboxes = nboxes - 1;
pos = pos - 1;
}
pos = pos + 1;
}
}
return inds_t.slice(0, 0, nboxes);
}
Tensor softnms_impl(Tensor boxes, Tensor scores, Tensor dets,
float iou_threshold, float sigma, float min_score,
int method, int offset);
REGISTER_DEVICE_IMPL(softnms_impl, CPU, softnms_cpu);
std::vector<std::vector<int> > nms_match_cpu(Tensor dets, float iou_threshold) {
auto x1_t = dets.select(1, 0).contiguous();
auto y1_t = dets.select(1, 1).contiguous();
auto x2_t = dets.select(1, 2).contiguous();
auto y2_t = dets.select(1, 3).contiguous();
auto scores = dets.select(1, 4).contiguous();
at::Tensor areas_t = (x2_t - x1_t) * (y2_t - y1_t);
auto order_t = std::get<1>(scores.sort(0, /* descending=*/true));
auto ndets = dets.size(0);
at::Tensor suppressed_t =
at::zeros({ndets}, dets.options().dtype(at::kByte).device(at::kCPU));
auto suppressed = suppressed_t.data_ptr<uint8_t>();
auto order = order_t.data_ptr<int64_t>();
auto x1 = x1_t.data_ptr<float>();
auto y1 = y1_t.data_ptr<float>();
auto x2 = x2_t.data_ptr<float>();
auto y2 = y2_t.data_ptr<float>();
auto areas = areas_t.data_ptr<float>();
std::vector<int> keep;
std::vector<std::vector<int> > matched;
for (int64_t _i = 0; _i < ndets; _i++) {
auto i = order[_i];
if (suppressed[i] == 1) continue;
keep.push_back(i);
std::vector<int> v_i;
auto ix1 = x1[i];
auto iy1 = y1[i];
auto ix2 = x2[i];
auto iy2 = y2[i];
auto iarea = areas[i];
for (int64_t _j = _i + 1; _j < ndets; _j++) {
auto j = order[_j];
if (suppressed[j] == 1) continue;
auto xx1 = std::max(ix1, x1[j]);
auto yy1 = std::max(iy1, y1[j]);
auto xx2 = std::min(ix2, x2[j]);
auto yy2 = std::min(iy2, y2[j]);
auto w = std::max(static_cast<float>(0), xx2 - xx1);
auto h = std::max(static_cast<float>(0), yy2 - yy1);
auto inter = w * h;
auto ovr = inter / (iarea + areas[j] - inter);
if (ovr >= iou_threshold) {
suppressed[j] = 1;
v_i.push_back(j);
}
}
matched.push_back(v_i);
}
for (size_t i = 0; i < keep.size(); i++)
matched[i].insert(matched[i].begin(), keep[i]);
return matched;
}
std::vector<std::vector<int> > nms_match_impl(Tensor dets, float iou_threshold);
REGISTER_DEVICE_IMPL(nms_match_impl, CPU, nms_match_cpu);
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