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Fix crash when truth center is outside of the image (#2471)

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Adrià Arrufat 2021-12-08 03:49:06 +01:00 committed by GitHub
parent a2c4760307
commit f0c0b307d5
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1 changed files with 4 additions and 4 deletions
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8
dlib/dnn/loss.h
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@ -3682,7 +3682,7 @@ namespace dlib
tensor& grad = layer<TAG_TYPE>(sub).get_gradient_input();
DLIB_CASSERT(input_tensor.num_samples() == grad.num_samples());
DLIB_CASSERT(input_tensor.num_samples() == output_tensor.num_samples());
const double input_area = input_tensor.nr() * input_tensor.nc();
const rectangle input_rect(input_tensor.nr(), input_tensor.nc());
float* g = grad.host();
// Compute the objectness loss for all grid cells
@ -3709,7 +3709,7 @@ namespace dlib
double best_iou = 0;
for (const yolo_rect& truth_box : *truth)
{
if (truth_box.ignore)
if (truth_box.ignore || !input_rect.contains(center(truth_box.rect)))
continue;
best_iou = std::max(best_iou, box_intersection_over_union(truth_box.rect, pred.rect));
}
@ -3724,7 +3724,7 @@ namespace dlib
// Now find the best anchor box for each truth box
for (const yolo_rect& truth_box : *truth)
{
if (truth_box.ignore)
if (truth_box.ignore || !input_rect.contains(center(truth_box.rect)))
continue;
const dpoint t_center = dcenter(truth_box);
double best_iou = 0;
@ -3780,7 +3780,7 @@ namespace dlib
const double th = truth_box.rect.height() / (anchors[a].height + truth_box.rect.height());
// Scale regression error according to the truth size
const double scale_box = options.lambda_box * (2 - truth_box.rect.area() / input_area);
const double scale_box = options.lambda_box * (2 - truth_box.rect.area() / input_rect.area());
// Compute the gradient for the box coordinates
g[x_idx] = scale_box * (out_data[x_idx] - tx);